int main()
{
// glfw: initialize and configure
// ------------------------------
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_SAMPLES, 4);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // uncomment this statement to fix compilation on OS X
// glfw window creation
// --------------------
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
glfwMakeContextCurrent(window);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// tell GLFW to capture our mouse
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// glad: load all OpenGL function pointers
// ---------------------------------------
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
// configure global opengl state
// -----------------------------
glEnable(GL_DEPTH_TEST);
// set depth function to less than AND equal for skybox depth trick.
glDepthFunc(GL_LEQUAL);
// enable seamless cubemap sampling for lower mip levels in the pre-filter map.
glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
// build and compile shaders
// -------------------------
Shader pbrShader("2.2.2.pbr.vs", "2.2.2.pbr.fs");
Shader equirectangularToCubemapShader("2.2.2.cubemap.vs", "2.2.2.equirectangular_to_cubemap.fs");
Shader irradianceShader("2.2.2.cubemap.vs", "2.2.2.irradiance_convolution.fs");
Shader prefilterShader("2.2.2.cubemap.vs", "2.2.2.prefilter.fs");
Shader brdfShader("2.2.2.brdf.vs", "2.2.2.brdf.fs");
Shader backgroundShader("2.2.2.background.vs", "2.2.2.background.fs");
pbrShader.use();
pbrShader.setInt("irradianceMap", 0);
pbrShader.setInt("prefilterMap", 1);
pbrShader.setInt("brdfLUT", 2);
pbrShader.setInt("albedoMap", 3);
pbrShader.setInt("normalMap", 4);
pbrShader.setInt("metallicMap", 5);
pbrShader.setInt("roughnessMap", 6);
pbrShader.setInt("aoMap", 7);
backgroundShader.use();
backgroundShader.setInt("environmentMap", 0);
// load PBR material textures
// --------------------------
// rusted iron
unsigned int ironAlbedoMap = loadTexture(FileSystem::getPath("resources/textures/pbr/rusted_iron/albedo.png").c_str());
unsigned int ironNormalMap = loadTexture(FileSystem::getPath("resources/textures/pbr/rusted_iron/normal.png").c_str());
unsigned int ironMetallicMap = loadTexture(FileSystem::getPath("resources/textures/pbr/rusted_iron/metallic.png").c_str());
unsigned int ironRoughnessMap = loadTexture(FileSystem::getPath("resources/textures/pbr/rusted_iron/roughness.png").c_str());
unsigned int ironAOMap = loadTexture(FileSystem::getPath("resources/textures/pbr/rusted_iron/ao.png").c_str());
// gold
unsigned int goldAlbedoMap = loadTexture(FileSystem::getPath("resources/textures/pbr/gold/albedo.png").c_str());
unsigned int goldNormalMap = loadTexture(FileSystem::getPath("resources/textures/pbr/gold/normal.png").c_str());
unsigned int goldMetallicMap = loadTexture(FileSystem::getPath("resources/textures/pbr/gold/metallic.png").c_str());
unsigned int goldRoughnessMap = loadTexture(FileSystem::getPath("resources/textures/pbr/gold/roughness.png").c_str());
unsigned int goldAOMap = loadTexture(FileSystem::getPath("resources/textures/pbr/gold/ao.png").c_str());
// grass
unsigned int grassAlbedoMap = loadTexture(FileSystem::getPath("resources/textures/pbr/grass/albedo.png").c_str());
unsigned int grassNormalMap = loadTexture(FileSystem::getPath("resources/textures/pbr/grass/normal.png").c_str());
unsigned int grassMetallicMap = loadTexture(FileSystem::getPath("resources/textures/pbr/grass/metallic.png").c_str());
unsigned int grassRoughnessMap = loadTexture(FileSystem::getPath("resources/textures/pbr/grass/roughness.png").c_str());
unsigned int grassAOMap = loadTexture(FileSystem::getPath("resources/textures/pbr/grass/ao.png").c_str());
// plastic
unsigned int plasticAlbedoMap = loadTexture(FileSystem::getPath("resources/textures/pbr/plastic/albedo.png").c_str());
unsigned int plasticNormalMap = loadTexture(FileSystem::getPath("resources/textures/pbr/plastic/normal.png").c_str());
unsigned int plasticMetallicMap = loadTexture(FileSystem::getPath("resources/textures/pbr/plastic/metallic.png").c_str());
unsigned int plasticRoughnessMap = loadTexture(FileSystem::getPath("resources/textures/pbr/plastic/roughness.png").c_str());
unsigned int plasticAOMap = loadTexture(FileSystem::getPath("resources/textures/pbr/plastic/ao.png").c_str());
// wall
unsigned int wallAlbedoMap = loadTexture(FileSystem::getPath("resources/textures/pbr/wall/albedo.png").c_str());
unsigned int wallNormalMap = loadTexture(FileSystem::getPath("resources/textures/pbr/wall/normal.png").c_str());
unsigned int wallMetallicMap = loadTexture(FileSystem::getPath("resources/textures/pbr/wall/metallic.png").c_str());
unsigned int wallRoughnessMap = loadTexture(FileSystem::getPath("resources/textures/pbr/wall/roughness.png").c_str());
unsigned int wallAOMap = loadTexture(FileSystem::getPath("resources/textures/pbr/wall/ao.png").c_str());
// lights
// ------
glm::vec3 lightPositions[] = {
glm::vec3(-10.0f, 10.0f, 10.0f),
glm::vec3( 10.0f, 10.0f, 10.0f),
glm::vec3(-10.0f, -10.0f, 10.0f),
glm::vec3( 10.0f, -10.0f, 10.0f),
};
glm::vec3 lightColors[] = {
glm::vec3(300.0f, 300.0f, 300.0f),
glm::vec3(300.0f, 300.0f, 300.0f),
glm::vec3(300.0f, 300.0f, 300.0f),
glm::vec3(300.0f, 300.0f, 300.0f)
};
int nrRows = 7;
int nrColumns = 7;
float spacing = 2.5;
// pbr: setup framebuffer
// ----------------------
unsigned int captureFBO;
unsigned int captureRBO;
glGenFramebuffers(1, &captureFBO);
glGenRenderbuffers(1, &captureRBO);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 512, 512);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, captureRBO);
// pbr: load the HDR environment map
// ---------------------------------
stbi_set_flip_vertically_on_load(true);
int width, height, nrComponents;
float *data = stbi_loadf(FileSystem::getPath("resources/textures/hdr/newport_loft.hdr").c_str(), &width, &height, &nrComponents, 0);
unsigned int hdrTexture;
if (data)
{
glGenTextures(1, &hdrTexture);
glBindTexture(GL_TEXTURE_2D, hdrTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, data); // note how we specify the texture's data value to be float
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
stbi_image_free(data);
}
else
{
std::cout << "Failed to load HDR image." << std::endl;
}
// pbr: setup cubemap to render to and attach to framebuffer
// ---------------------------------------------------------
unsigned int envCubemap;
glGenTextures(1, &envCubemap);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
for (unsigned int i = 0; i < 6; ++i)
{
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 512, 512, 0, GL_RGB, GL_FLOAT, nullptr);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); // enable pre-filter mipmap sampling (combatting visible dots artifact)
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// pbr: set up projection and view matrices for capturing data onto the 6 cubemap face directions
// ----------------------------------------------------------------------------------------------
glm::mat4 captureProjection = glm::perspective(glm::radians(90.0f), 1.0f, 0.1f, 10.0f);
glm::mat4 captureViews[] =
{
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 0.0f, 1.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 0.0f, -1.0f, 0.0f), glm::vec3(0.0f, 0.0f, -1.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 0.0f, 0.0f, 1.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 0.0f, 0.0f, -1.0f), glm::vec3(0.0f, -1.0f, 0.0f))
};
// pbr: convert HDR equirectangular environment map to cubemap equivalent
// ----------------------------------------------------------------------
equirectangularToCubemapShader.use();
equirectangularToCubemapShader.setInt("equirectangularMap", 0);
equirectangularToCubemapShader.setMat4("projection", captureProjection);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, hdrTexture);
glViewport(0, 0, 512, 512); // don't forget to configure the viewport to the capture dimensions.
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
for (unsigned int i = 0; i < 6; ++i)
{
equirectangularToCubemapShader.setMat4("view", captureViews[i]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, envCubemap, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderCube();
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// then let OpenGL generate mipmaps from first mip face (combatting visible dots artifact)
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
glGenerateMipmap(GL_TEXTURE_CUBE_MAP);
// pbr: create an irradiance cubemap, and re-scale capture FBO to irradiance scale.
// --------------------------------------------------------------------------------
unsigned int irradianceMap;
glGenTextures(1, &irradianceMap);
glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap);
for (unsigned int i = 0; i < 6; ++i)
{
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 32, 32, 0, GL_RGB, GL_FLOAT, nullptr);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 32, 32);
// pbr: solve diffuse integral by convolution to create an irradiance (cube)map.
// -----------------------------------------------------------------------------
irradianceShader.use();
irradianceShader.setInt("environmentMap", 0);
irradianceShader.setMat4("projection", captureProjection);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
glViewport(0, 0, 32, 32); // don't forget to configure the viewport to the capture dimensions.
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
for (unsigned int i = 0; i < 6; ++i)
{
irradianceShader.setMat4("view", captureViews[i]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, irradianceMap, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderCube();
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// pbr: create a pre-filter cubemap, and re-scale capture FBO to pre-filter scale.
// --------------------------------------------------------------------------------
unsigned int prefilterMap;
glGenTextures(1, &prefilterMap);
glBindTexture(GL_TEXTURE_CUBE_MAP, prefilterMap);
for (unsigned int i = 0; i < 6; ++i)
{
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 128, 128, 0, GL_RGB, GL_FLOAT, nullptr);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); // be sure to set minifcation filter to mip_linear
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// generate mipmaps for the cubemap so OpenGL automatically allocates the required memory.
glGenerateMipmap(GL_TEXTURE_CUBE_MAP);
// pbr: run a quasi monte-carlo simulation on the environment lighting to create a prefilter (cube)map.
// ----------------------------------------------------------------------------------------------------
prefilterShader.use();
prefilterShader.setInt("environmentMap", 0);
prefilterShader.setMat4("projection", captureProjection);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
unsigned int maxMipLevels = 5;
for (unsigned int mip = 0; mip < maxMipLevels; ++mip)
{
// reisze framebuffer according to mip-level size.
unsigned int mipWidth = 128 * std::pow(0.5, mip);
unsigned int mipHeight = 128 * std::pow(0.5, mip);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, mipWidth, mipHeight);
glViewport(0, 0, mipWidth, mipHeight);
float roughness = (float)mip / (float)(maxMipLevels - 1);
prefilterShader.setFloat("roughness", roughness);
for (unsigned int i = 0; i < 6; ++i)
{
prefilterShader.setMat4("view", captureViews[i]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, prefilterMap, mip);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderCube();
}
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// pbr: generate a 2D LUT from the BRDF equations used.
// ----------------------------------------------------
unsigned int brdfLUTTexture;
glGenTextures(1, &brdfLUTTexture);
// pre-allocate enough memory for the LUT texture.
glBindTexture(GL_TEXTURE_2D, brdfLUTTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RG16F, 512, 512, 0, GL_RG, GL_FLOAT, 0);
// be sure to set wrapping mode to GL_CLAMP_TO_EDGE
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// then re-configure capture framebuffer object and render screen-space quad with BRDF shader.
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 512, 512);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, brdfLUTTexture, 0);
glViewport(0, 0, 512, 512);
brdfShader.use();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderQuad();
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// initialize static shader uniforms before rendering
// --------------------------------------------------
glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
pbrShader.use();
pbrShader.setMat4("projection", projection);
backgroundShader.use();
backgroundShader.setMat4("projection", projection);
// then before rendering, configure the viewport to the original framebuffer's screen dimensions
int scrWidth, scrHeight;
glfwGetFramebufferSize(window, &scrWidth, &scrHeight);
glViewport(0, 0, scrWidth, scrHeight);
// render loop
// -----------
while (!glfwWindowShouldClose(window))
{
// per-frame time logic
// --------------------
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// input
// -----
processInput(window);
// render
// ------
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// render scene, supplying the convoluted irradiance map to the final shader.
// ------------------------------------------------------------------------------------------
pbrShader.use();
glm::mat4 model;
glm::mat4 view = camera.GetViewMatrix();
pbrShader.setMat4("view", view);
pbrShader.setVec3("camPos", camera.Position);
// bind pre-computed IBL data
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_CUBE_MAP, prefilterMap);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, brdfLUTTexture);
// rusted iron
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, ironAlbedoMap);
glActiveTexture(GL_TEXTURE4);
glBindTexture(GL_TEXTURE_2D, ironNormalMap);
glActiveTexture(GL_TEXTURE5);
glBindTexture(GL_TEXTURE_2D, ironMetallicMap);
glActiveTexture(GL_TEXTURE6);
glBindTexture(GL_TEXTURE_2D, ironRoughnessMap);
glActiveTexture(GL_TEXTURE7);
glBindTexture(GL_TEXTURE_2D, ironAOMap);
model = glm::mat4();
model = glm::translate(model, glm::vec3(-5.0, 0.0, 2.0));
pbrShader.setMat4("model", model);
renderSphere();
// gold
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, goldAlbedoMap);
glActiveTexture(GL_TEXTURE4);
glBindTexture(GL_TEXTURE_2D, goldNormalMap);
glActiveTexture(GL_TEXTURE5);
glBindTexture(GL_TEXTURE_2D, goldMetallicMap);
glActiveTexture(GL_TEXTURE6);
glBindTexture(GL_TEXTURE_2D, goldRoughnessMap);
glActiveTexture(GL_TEXTURE7);
glBindTexture(GL_TEXTURE_2D, goldAOMap);
model = glm::mat4();
model = glm::translate(model, glm::vec3(-3.0, 0.0, 2.0));
pbrShader.setMat4("model", model);
renderSphere();
// grass
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, grassAlbedoMap);
glActiveTexture(GL_TEXTURE4);
glBindTexture(GL_TEXTURE_2D, grassNormalMap);
glActiveTexture(GL_TEXTURE5);
glBindTexture(GL_TEXTURE_2D, grassMetallicMap);
glActiveTexture(GL_TEXTURE6);
glBindTexture(GL_TEXTURE_2D, grassRoughnessMap);
glActiveTexture(GL_TEXTURE7);
glBindTexture(GL_TEXTURE_2D, grassAOMap);
model = glm::mat4();
model = glm::translate(model, glm::vec3(-1.0, 0.0, 2.0));
pbrShader.setMat4("model", model);
renderSphere();
// plastic
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, plasticAlbedoMap);
glActiveTexture(GL_TEXTURE4);
glBindTexture(GL_TEXTURE_2D, plasticNormalMap);
glActiveTexture(GL_TEXTURE5);
glBindTexture(GL_TEXTURE_2D, plasticMetallicMap);
glActiveTexture(GL_TEXTURE6);
glBindTexture(GL_TEXTURE_2D, plasticRoughnessMap);
glActiveTexture(GL_TEXTURE7);
glBindTexture(GL_TEXTURE_2D, plasticAOMap);
model = glm::mat4();
model = glm::translate(model, glm::vec3(1.0, 0.0, 2.0));
pbrShader.setMat4("model", model);
renderSphere();
// wall
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, wallAlbedoMap);
glActiveTexture(GL_TEXTURE4);
glBindTexture(GL_TEXTURE_2D, wallNormalMap);
glActiveTexture(GL_TEXTURE5);
glBindTexture(GL_TEXTURE_2D, wallMetallicMap);
glActiveTexture(GL_TEXTURE6);
glBindTexture(GL_TEXTURE_2D, wallRoughnessMap);
glActiveTexture(GL_TEXTURE7);
glBindTexture(GL_TEXTURE_2D, wallAOMap);
model = glm::mat4();
model = glm::translate(model, glm::vec3(3.0, 0.0, 2.0));
pbrShader.setMat4("model", model);
renderSphere();
// render light source (simply re-render sphere at light positions)
// this looks a bit off as we use the same shader, but it'll make their positions obvious and
// keeps the codeprint small.
for (unsigned int i = 0; i < sizeof(lightPositions) / sizeof(lightPositions[0]); ++i)
{
glm::vec3 newPos = lightPositions[i] + glm::vec3(sin(glfwGetTime() * 5.0) * 5.0, 0.0, 0.0);
newPos = lightPositions[i];
pbrShader.setVec3("lightPositions[" + std::to_string(i) + "]", newPos);
pbrShader.setVec3("lightColors[" + std::to_string(i) + "]", lightColors[i]);
model = glm::mat4();
model = glm::translate(model, newPos);
model = glm::scale(model, glm::vec3(0.5f));
pbrShader.setMat4("model", model);
renderSphere();
}
// render skybox (render as last to prevent overdraw)
backgroundShader.use();
backgroundShader.setMat4("view", view);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
//glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap); // display irradiance map
//glBindTexture(GL_TEXTURE_CUBE_MAP, prefilterMap); // display prefilter map
renderCube();
// render BRDF map to screen
//brdfShader.Use();
//renderQuad();
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
// -------------------------------------------------------------------------------
glfwSwapBuffers(window);
glfwPollEvents();
}
// glfw: terminate, clearing all previously allocated GLFW resources.
// ------------------------------------------------------------------
glfwTerminate();
return 0;
}
int main()
{
// glfw: initialize and configure
// ------------------------------
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#ifdef __APPLE__
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // uncomment this statement to fix compilation on OS X
#endif
// glfw window creation
// --------------------
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
// glad: load all OpenGL function pointers
// ---------------------------------------
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
// build and compile our shader zprogram
// ------------------------------------
Shader ourShader("4.5.texture.vs", "4.5.texture.fs");
// set up vertex data (and buffer(s)) and configure vertex attributes
// ------------------------------------------------------------------
float vertices[] = {
// positions // colors // texture coords
0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top right
0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom right
-0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom left
-0.5f, 0.5f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f // top left
};
unsigned int indices[] = {
0, 1, 3, // first triangle
1, 2, 3 // second triangle
};
unsigned int VBO, VAO, EBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
// position attribute
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
// color attribute
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
// texture coord attribute
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
glEnableVertexAttribArray(2);
// load and create a texture
// -------------------------
unsigned int texture1, texture2;
// texture 1
// ---------
glGenTextures(1, &texture1);
glBindTexture(GL_TEXTURE_2D, texture1);
// set the texture wrapping parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); // set texture wrapping to GL_REPEAT (default wrapping method)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// set texture filtering parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// load image, create texture and generate mipmaps
int width, height, nrChannels;
stbi_set_flip_vertically_on_load(true); // tell stb_image.h to flip loaded texture's on the y-axis.
// The FileSystem::getPath(...) is part of the GitHub repository so we can find files on any IDE/platform; replace it with your own image path.
unsigned char *data = stbi_load(FileSystem::getPath("resources/textures/container.jpg").c_str(), &width, &height, &nrChannels, 0);
if (data)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
stbi_image_free(data);
// texture 2
// ---------
glGenTextures(1, &texture2);
glBindTexture(GL_TEXTURE_2D, texture2);
// set the texture wrapping parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); // set texture wrapping to GL_REPEAT (default wrapping method)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// set texture filtering parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// load image, create texture and generate mipmaps
data = stbi_load(FileSystem::getPath("resources/textures/awesomeface.png").c_str(), &width, &height, &nrChannels, 0);
if (data)
{
// note that the awesomeface.png has transparency and thus an alpha channel, so make sure to tell OpenGL the data type is of GL_RGBA
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
stbi_image_free(data);
// tell opengl for each sampler to which texture unit it belongs to (only has to be done once)
// -------------------------------------------------------------------------------------------
ourShader.use(); // don't forget to activate/use the shader before setting uniforms!
// either set it manually like so:
glUniform1i(glGetUniformLocation(ourShader.ID, "texture1"), 0);
// or set it via the texture class
ourShader.setInt("texture2", 1);
// render loop
// -----------
while (!glfwWindowShouldClose(window))
{
// input
// -----
processInput(window);
// render
// ------
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
// bind textures on corresponding texture units
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture1);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, texture2);
// set the texture mix value in the shader
ourShader.setFloat("mixValue", mixValue);
// render container
ourShader.use();
glBindVertexArray(VAO);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
// -------------------------------------------------------------------------------
glfwSwapBuffers(window);
glfwPollEvents();
}
// optional: de-allocate all resources once they've outlived their purpose:
// ------------------------------------------------------------------------
glDeleteVertexArrays(1, &VAO);
glDeleteBuffers(1, &VBO);
glDeleteBuffers(1, &EBO);
// glfw: terminate, clearing all previously allocated GLFW resources.
// ------------------------------------------------------------------
glfwTerminate();
return 0;
}
int main()
{
// glfw: initialize and configure
// ------------------------------
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#ifdef __APPLE__
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // uncomment this statement to fix compilation on OS X
#endif
// glfw window creation
// --------------------
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// tell GLFW to capture our mouse
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// glad: load all OpenGL function pointers
// ---------------------------------------
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
// configure global opengl state
// -----------------------------
glEnable(GL_DEPTH_TEST);
// build and compile our shader zprogram
// ------------------------------------
Shader ourShader("7.3.camera.vs", "7.3.camera.fs");
// set up vertex data (and buffer(s)) and configure vertex attributes
// ------------------------------------------------------------------
float vertices[] = {
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f
};
// world space positions of our cubes
glm::vec3 cubePositions[] = {
glm::vec3( 0.0f, 0.0f, 0.0f),
glm::vec3( 2.0f, 5.0f, -15.0f),
glm::vec3(-1.5f, -2.2f, -2.5f),
glm::vec3(-3.8f, -2.0f, -12.3f),
glm::vec3( 2.4f, -0.4f, -3.5f),
glm::vec3(-1.7f, 3.0f, -7.5f),
glm::vec3( 1.3f, -2.0f, -2.5f),
glm::vec3( 1.5f, 2.0f, -2.5f),
glm::vec3( 1.5f, 0.2f, -1.5f),
glm::vec3(-1.3f, 1.0f, -1.5f)
};
unsigned int VBO, VAO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// position attribute
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
// texture coord attribute
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
// load and create a texture
// -------------------------
unsigned int texture1, texture2;
// texture 1
// ---------
glGenTextures(1, &texture1);
glBindTexture(GL_TEXTURE_2D, texture1);
// set the texture wrapping parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// set texture filtering parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// load image, create texture and generate mipmaps
int width, height, nrChannels;
stbi_set_flip_vertically_on_load(true); // tell stb_image.h to flip loaded texture's on the y-axis.
unsigned char *data = stbi_load(FileSystem::getPath("resources/textures/container.jpg").c_str(), &width, &height, &nrChannels, 0);
if (data)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
stbi_image_free(data);
// texture 2
// ---------
glGenTextures(1, &texture2);
glBindTexture(GL_TEXTURE_2D, texture2);
// set the texture wrapping parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// set texture filtering parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// load image, create texture and generate mipmaps
data = stbi_load(FileSystem::getPath("resources/textures/awesomeface.png").c_str(), &width, &height, &nrChannels, 0);
if (data)
{
// note that the awesomeface.png has transparency and thus an alpha channel, so make sure to tell OpenGL the data type is of GL_RGBA
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
stbi_image_free(data);
// tell opengl for each sampler to which texture unit it belongs to (only has to be done once)
// -------------------------------------------------------------------------------------------
ourShader.use();
ourShader.setInt("texture1", 0);
ourShader.setInt("texture2", 1);
// render loop
// -----------
while (!glfwWindowShouldClose(window))
{
// per-frame time logic
// --------------------
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// input
// -----
processInput(window);
// render
// ------
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// bind textures on corresponding texture units
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture1);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, texture2);
// activate shader
ourShader.use();
// pass projection matrix to shader (note that in this case it could change every frame)
glm::mat4 projection = glm::perspective(glm::radians(fov), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
ourShader.setMat4("projection", projection);
// camera/view transformation
glm::mat4 view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);
ourShader.setMat4("view", view);
// render boxes
glBindVertexArray(VAO);
for (unsigned int i = 0; i < 10; i++)
{
// calculate the model matrix for each object and pass it to shader before drawing
glm::mat4 model = glm::mat4(1.0f); // make sure to initialize matrix to identity matrix first
model = glm::translate(model, cubePositions[i]);
float angle = 20.0f * i;
model = glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
ourShader.setMat4("model", model);
glDrawArrays(GL_TRIANGLES, 0, 36);
}
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
// -------------------------------------------------------------------------------
glfwSwapBuffers(window);
glfwPollEvents();
}
// optional: de-allocate all resources once they've outlived their purpose:
// ------------------------------------------------------------------------
glDeleteVertexArrays(1, &VAO);
glDeleteBuffers(1, &VBO);
// glfw: terminate, clearing all previously allocated GLFW resources.
// ------------------------------------------------------------------
glfwTerminate();
return 0;
}
kit::Texture::Texture(const std::string & filename, kit::Texture::InternalFormat format, uint8_t levels, Type t) : kit::Texture(t)
{
std::cout << "Loading texture from file \"" << filename.c_str() << "\"" << std::endl;
m_filename = filename;
if(t == Type::Texture2D)
{
m_internalFormat = format;
// Try to load data from file
unsigned char* bufferdata;
int x, y, n;
stbi_set_flip_vertically_on_load(1);
bufferdata = stbi_load(filename.c_str(), &x, &y, &n, 4);
if (bufferdata == nullptr)
{
KIT_THROW(stbi_failure_reason());
}
// Set resolution
m_resolution = glm::uvec3(x, y, 0);
uint8_t mipLevels = levels > 0 ? levels : calculateMipLevels();
// Specify storage and upload data to GPU
#ifndef KIT_SHITTY_INTEL
glTextureStorage2D(m_glHandle, mipLevels, m_internalFormat, m_resolution.x, m_resolution.y);
glTextureSubImage2D(m_glHandle, 0, 0, 0, x, y, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
#else
bind();
glTexStorage2D(m_type, mipLevels, m_internalFormat, m_resolution.x, m_resolution.y);
glTexSubImage2D(m_type, 0, 0, 0, x, y, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
#endif
// Free loaded data
stbi_image_free(bufferdata);
// Set parameters
setEdgeSamplingMode(EdgeSamplingMode::Repeat);
setMinFilteringMode(m_minFilteringMode);
setMagFilteringMode(m_magFilteringMode);
setAnisotropicLevel(1.0f);
}
if(t == Type::Texture3D)
{
m_internalFormat = format;
// Try to load data from file
unsigned char* bufferdata;
int x, y, n;
stbi_set_flip_vertically_on_load(0);
bufferdata = stbi_load(filename.c_str(), &x, &y, &n, 4);
if (bufferdata == nullptr) {
KIT_THROW(stbi_failure_reason());
}
if (y != x*x || y%y != 0)
{
KIT_THROW("Failed to load 3d texture from file, not perfectly cubical");
}
// Set resolution
m_resolution = glm::uvec3(x, x, x);
// Specify storage and upload data to GPU
#ifndef KIT_SHITTY_INTEL
glTextureStorage3D(m_glHandle, 1, m_internalFormat, x, x, x);
glTextureSubImage3D(m_glHandle, 0, 0, 0, 0, x, x, x, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
#else
returner->bind();
glTexStorage3D(returner->m_type, 1, m_internalFormat, x, x, x);
glTexSubImage3D(returner->m_type, 0, 0, 0, 0, x, x, x, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
#endif
// Free loaded data
stbi_image_free(bufferdata);
setEdgeSamplingMode(EdgeSamplingMode::Repeat);
setMinFilteringMode(m_minFilteringMode);
setMagFilteringMode(m_magFilteringMode);
setAnisotropicLevel(1.0f);
}
}
TextureAssetManager::TextureAssetManager() {
// Load images bottom-to-top (since that is how OpenGL expects textures)
stbi_set_flip_vertically_on_load(true);
}
int main(void) {
//A hello world example with embedded Lua
int status, result, i;
double sum;
lua_State *L = luaL_newstate();
luaL_openlibs(L); /* Load Lua libraries */
luaL_dostring(L, "print\"Please print me!\"");
lua_close(L); /* Cya, Lua */
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window = glfwCreateWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "LearnOpenGL", NULL, NULL);
if (window == NULL) {
printf("Failed to create GLFW window\n");
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
if (!gladLoadGL()) {
printf("Failed to initialize GLAD\n");
return -1;
}
unsigned int vertexShader;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
glCompileShader(vertexShader);
int success;
char infoLog[512];
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
printf("ERROR::SHADER::VERTEX::COMPILATION_FAILED\n%s\n", infoLog);
}
unsigned int fragmentShader;
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
printf("ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n%s\n", infoLog);
}
shaderProgram = glCreateProgram();
glAttachShader(shaderProgram, vertexShader);
glAttachShader(shaderProgram, fragmentShader);
glLinkProgram(shaderProgram);
glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
printf("ERROR::SHADER::PROGRAM::LINKING_FAILED\n%s\n", infoLog);
}
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
float vertices[] = {
// Postition // Color // Texture Coordinates
0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f
};
unsigned int indices[] = {
0, 1, 3,
1, 2, 3
};
unsigned int VBO, VAO, EBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void *)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void * ) (3 * sizeof(float)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void *) (6 * sizeof(float)));
glEnableVertexAttribArray(2);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
// Use this code to render in wireframe mode
//glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
/* Texture 1 */
unsigned int texture1, texture2;
glGenTextures(1, &texture1);
glBindTexture(GL_TEXTURE_2D, texture1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
int width, height, nrChannels;
stbi_set_flip_vertically_on_load(GL_TRUE);
unsigned char * data = stbi_load("src/Textures/container.jpg", &width, &height, &nrChannels, 0);
if (data) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else {
printf("Failed to load texture\n");
}
stbi_image_free(data);
/* Texture 2 */
glGenTextures(1, &texture2);
glBindTexture(GL_TEXTURE_2D, texture2);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
data = stbi_load("src/Textures/awesomeface.png", &width, &height, &nrChannels, 4);
if (data) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else {
printf("Failed to load texture\n");
}
stbi_image_free(data);
glUseProgram(shaderProgram);
glUniform1i(glGetUniformLocation(shaderProgram, "texture1"), 0);
glUniform1i(glGetUniformLocation(shaderProgram, "texture2"), 1);
while (!glfwWindowShouldClose(window)) {
processInput(window);
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture1);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, texture2);
glUniform1f(glGetUniformLocation(shaderProgram, "time"), glfwGetTime());
glUseProgram(shaderProgram);
glBindVertexArray(VAO);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glfwSwapBuffers(window);
glfwPollEvents();
}
glDeleteVertexArrays(1, &VAO);
glDeleteBuffers(1, &VBO);
glDeleteBuffers(1, &EBO);
glfwTerminate();
return 0;
}
KD_API KDImageATX KD_APIENTRY kdGetImageFromStreamATX(KDFile *file, KDint format, KDint flags)
{
_KDImageATX *image = (_KDImageATX *)kdMalloc(sizeof(_KDImageATX));
if(image == KD_NULL)
{
kdSetError(KD_ENOMEM);
return KD_NULL;
}
image->levels = 0;
image->bpp = 8;
KDStat st;
if(kdFstat(file, &st) == -1)
{
kdFree(image);
kdSetError(KD_EIO);
return KD_NULL;
}
void *filedata = kdMalloc((KDsize)st.st_size);
if(filedata == KD_NULL)
{
kdFree(image);
kdSetError(KD_ENOMEM);
return KD_NULL;
}
if(kdFread(filedata, 1, (KDsize)st.st_size, file) != (KDsize)st.st_size)
{
kdFree(filedata);
kdFree(image);
kdSetError(KD_EIO);
return KD_NULL;
}
if(kdFseek(file, 0, KD_SEEK_SET) == -1)
{
kdFree(filedata);
kdFree(image);
kdSetError(KD_EIO);
return KD_NULL;
}
KDint channels = 0;
image->format = format;
switch(image->format)
{
case(KD_IMAGE_FORMAT_RGBA8888_ATX):
{
channels = 4;
image->alpha = KD_TRUE;
break;
}
case(KD_IMAGE_FORMAT_RGB888_ATX):
{
channels = 3;
image->alpha = KD_FALSE;
break;
}
case(KD_IMAGE_FORMAT_LUMALPHA88_ATX):
{
channels = 2;
image->alpha = KD_TRUE;
break;
}
case(KD_IMAGE_FORMAT_LUM8_ATX):
{
channels = 1;
image->alpha = KD_FALSE;
break;
}
case(KD_IMAGE_FORMAT_COMPRESSED_ATX):
{
/* TODO: Load compressed formats (do not decode) */
}
default:
{
kdFree(filedata);
kdFree(image);
kdSetError(KD_EINVAL);
return KD_NULL;
}
}
if(kdStrstrVEN(file->pathname, ".pvr"))
{
if(channels == 4)
{
/* PVR v2 only*/
struct PVR_Texture_Header {
KDuint dwHeaderSize; /* size of the structure */
KDuint dwHeight; /* height of surface to be created */
KDuint dwWidth; /* width of input surface */
KDuint dwMipMapCount; /* number of mip-map levels requested */
KDuint dwpfFlags; /* pixel format flags */
KDuint dwTextureDataSize; /* Total size in bytes */
KDuint dwBitCount; /* number of bits per pixel */
KDuint dwRBitMask; /* mask for red bit */
KDuint dwGBitMask; /* mask for green bits */
KDuint dwBBitMask; /* mask for blue bits */
KDuint dwAlphaBitMask; /* mask for alpha channel */
KDuint dwPVR; /* magic number identifying pvr file */
KDuint dwNumSurfs; /* the number of surfaces present in the pvr */
};
struct PVR_Texture_Header header;
kdMemcpy(&header, filedata, sizeof(KDuint) * 13);
image->height = (KDint)header.dwHeight;
image->width = (KDint)header.dwWidth;
image->size = (KDsize)image->width * (KDsize)image->height * (KDsize)channels * sizeof(KDuint);
image->buffer = kdMalloc(image->size);
/* PVRCT2/4 RGB/RGBA compressed formats for now */
__kdDecompressPVRTC((const KDuint8 *)filedata + header.dwHeaderSize, 0, image->width, image->height, image->buffer);
}
}
else
{
if(flags == KD_IMAGE_FLAG_FLIP_X_ATX)
{
stbi_set_flip_vertically_on_load(1);
}
image->buffer = stbi_load_from_memory(filedata, (KDint)st.st_size, &image->width, &image->height, (KDint[]) {0}, channels);
image->size = (KDsize)image->width * (KDsize)image->height * (KDsize)channels * sizeof(KDuint);
}
kdFree(filedata);
if(image->buffer == KD_NULL)
{
kdLogMessagefKHR("%s.\n", stbi_failure_reason());
kdFree(image);
kdSetError(KD_EILSEQ);
return KD_NULL;
}
return image;
}
GLuint loadTexture(std::string fileName){
std::string fileString = std::string(fileName);
fileString = fileString.substr(fileString.find_last_of("/"));
std::string fileContent;
std::string line;
int width, height, bytesPerPixel;
stbi_set_flip_vertically_on_load(true);
unsigned char *data = stbi_load(fileName.c_str(), &width, &height, &bytesPerPixel, 0);
if(data == NULL){
// std::cout << "ERROR: Unable to open image " << fileName << std::endl;
// DEBUGLOG->log("ERROR : Unable to open image " + fileName);
DEBUGLOG->log("ERROR : Unable to open image " + fileString);
return -1;}
// for ( unsigned int i = 0; i < width*height;i++)
// {
// std::cout<< (int)data[i] << std::endl;
// std::cout<< (int)data[i+1] << std::endl;
// std::cout<< (int)data[i+2] << std::endl;
// std::cout<< (int)data[i+3] << std::endl;
// }
//create new texture
GLuint textureHandle;
glGenTextures(1, &textureHandle);
//bind the texture
glBindTexture(GL_TEXTURE_2D, textureHandle);
//send image data to the new texture
if (bytesPerPixel < 3) {
DEBUGLOG->log("ERROR : Unable to open image " + fileString);
// DEBUGLOG->log("ERROR : Unable to open image " + fileName);
// std::cout << "ERROR: Unable to open image" << fileName << std::endl;
return -1;
} else if (bytesPerPixel == 3){
glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
} else if (bytesPerPixel == 4) {
glTexImage2D(GL_TEXTURE_2D, 0,GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
} else {
DEBUGLOG->log("Unknown format for bytes per pixel... Changed to \"4\"");
// std::cout << "Unknown format for bytes per pixel... Changed to \"4\"" << std::endl;
glTexImage2D(GL_TEXTURE_2D, 0,GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
}
//texture settings
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, true);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, 0);
stbi_image_free(data);
// DEBUGLOG->log("SUCCESS: image loaded from " + fileName );
DEBUGLOG->log( "SUCCESS: image loaded from " + fileString );
// std::cout << "SUCCESS: image loaded from " << fileName << std::endl;
return textureHandle;
}
int main()
{
// glfw: initialize and configure
// ------------------------------
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_SAMPLES, 4);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
// glfw window creation
// --------------------
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
glfwMakeContextCurrent(window);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// tell GLFW to capture our mouse
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// glad: load all OpenGL function pointers
// ---------------------------------------
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
// configure global opengl state
// -----------------------------
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL); // set depth function to less than AND equal for skybox depth trick.
// build and compile shaders
// -------------------------
Shader pbrShader("2.1.2.pbr.vs", "2.1.2.pbr.fs");
Shader equirectangularToCubemapShader("2.1.2.cubemap.vs", "2.1.2.equirectangular_to_cubemap.fs");
Shader irradianceShader("2.1.2.cubemap.vs", "2.1.2.irradiance_convolution.fs");
Shader backgroundShader("2.1.2.background.vs", "2.1.2.background.fs");
pbrShader.use();
pbrShader.setInt("irradianceMap", 0);
pbrShader.setVec3("albedo", 0.5f, 0.0f, 0.0f);
pbrShader.setFloat("ao", 1.0f);
backgroundShader.use();
backgroundShader.setInt("environmentMap", 0);
// lights
// ------
glm::vec3 lightPositions[] = {
glm::vec3(-10.0f, 10.0f, 10.0f),
glm::vec3( 10.0f, 10.0f, 10.0f),
glm::vec3(-10.0f, -10.0f, 10.0f),
glm::vec3( 10.0f, -10.0f, 10.0f),
};
glm::vec3 lightColors[] = {
glm::vec3(300.0f, 300.0f, 300.0f),
glm::vec3(300.0f, 300.0f, 300.0f),
glm::vec3(300.0f, 300.0f, 300.0f),
glm::vec3(300.0f, 300.0f, 300.0f)
};
int nrRows = 7;
int nrColumns = 7;
float spacing = 2.5;
// pbr: setup framebuffer
// ----------------------
unsigned int captureFBO;
unsigned int captureRBO;
glGenFramebuffers(1, &captureFBO);
glGenRenderbuffers(1, &captureRBO);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 512, 512);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, captureRBO);
// pbr: load the HDR environment map
// ---------------------------------
stbi_set_flip_vertically_on_load(true);
int width, height, nrComponents;
float *data = stbi_loadf(FileSystem::getPath("resources/textures/hdr/newport_loft.hdr").c_str(), &width, &height, &nrComponents, 0);
unsigned int hdrTexture;
if (data)
{
glGenTextures(1, &hdrTexture);
glBindTexture(GL_TEXTURE_2D, hdrTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, data); // note how we specify the texture's data value to be float
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
stbi_image_free(data);
}
else
{
std::cout << "Failed to load HDR image." << std::endl;
}
// pbr: setup cubemap to render to and attach to framebuffer
// ---------------------------------------------------------
unsigned int envCubemap;
glGenTextures(1, &envCubemap);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
for (unsigned int i = 0; i < 6; ++i)
{
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 512, 512, 0, GL_RGB, GL_FLOAT, nullptr);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// pbr: set up projection and view matrices for capturing data onto the 6 cubemap face directions
// ----------------------------------------------------------------------------------------------
glm::mat4 captureProjection = glm::perspective(glm::radians(90.0f), 1.0f, 0.1f, 10.0f);
glm::mat4 captureViews[] =
{
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(0.0f, 0.0f, -1.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, -1.0f), glm::vec3(0.0f, -1.0f, 0.0f))
};
// pbr: convert HDR equirectangular environment map to cubemap equivalent
// ----------------------------------------------------------------------
equirectangularToCubemapShader.use();
equirectangularToCubemapShader.setInt("equirectangularMap", 0);
equirectangularToCubemapShader.setMat4("projection", captureProjection);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, hdrTexture);
glViewport(0, 0, 512, 512); // don't forget to configure the viewport to the capture dimensions.
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
for (unsigned int i = 0; i < 6; ++i)
{
equirectangularToCubemapShader.setMat4("view", captureViews[i]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, envCubemap, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderCube();
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// pbr: create an irradiance cubemap, and re-scale capture FBO to irradiance scale.
// --------------------------------------------------------------------------------
unsigned int irradianceMap;
glGenTextures(1, &irradianceMap);
glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap);
for (unsigned int i = 0; i < 6; ++i)
{
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 32, 32, 0, GL_RGB, GL_FLOAT, nullptr);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 32, 32);
// pbr: solve diffuse integral by convolution to create an irradiance (cube)map.
// -----------------------------------------------------------------------------
irradianceShader.use();
irradianceShader.setInt("environmentMap", 0);
irradianceShader.setMat4("projection", captureProjection);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
glViewport(0, 0, 32, 32); // don't forget to configure the viewport to the capture dimensions.
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
for (unsigned int i = 0; i < 6; ++i)
{
irradianceShader.setMat4("view", captureViews[i]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, irradianceMap, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderCube();
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// initialize static shader uniforms before rendering
// --------------------------------------------------
glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
pbrShader.use();
pbrShader.setMat4("projection", projection);
backgroundShader.use();
backgroundShader.setMat4("projection", projection);
// then before rendering, configure the viewport to the original framebuffer's screen dimensions
int scrWidth, scrHeight;
glfwGetFramebufferSize(window, &scrWidth, &scrHeight);
glViewport(0, 0, scrWidth, scrHeight);
// render loop
// -----------
while (!glfwWindowShouldClose(window))
{
// per-frame time logic
// --------------------
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// input
// -----
processInput(window);
// render
// ------
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// render scene, supplying the convoluted irradiance map to the final shader.
// ------------------------------------------------------------------------------------------
pbrShader.use();
glm::mat4 view = camera.GetViewMatrix();
pbrShader.setMat4("view", view);
pbrShader.setVec3("camPos", camera.Position);
// bind pre-computed IBL data
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap);
// render rows*column number of spheres with material properties defined by textures (they all have the same material properties)
glm::mat4 model;
for (int row = 0; row < nrRows; ++row)
{
pbrShader.setFloat("metallic", (float)row / (float)nrRows);
for (int col = 0; col < nrColumns; ++col)
{
// we clamp the roughness to 0.025 - 1.0 as perfectly smooth surfaces (roughness of 0.0) tend to look a bit off
// on direct lighting.
pbrShader.setFloat("roughness", glm::clamp((float)col / (float)nrColumns, 0.05f, 1.0f));
model = glm::mat4();
model = glm::translate(model, glm::vec3(
(float)(col - (nrColumns / 2)) * spacing,
(float)(row - (nrRows / 2)) * spacing,
-2.0f
));
pbrShader.setMat4("model", model);
renderSphere();
}
}
// render light source (simply re-render sphere at light positions)
// this looks a bit off as we use the same shader, but it'll make their positions obvious and
// keeps the codeprint small.
for (unsigned int i = 0; i < sizeof(lightPositions) / sizeof(lightPositions[0]); ++i)
{
glm::vec3 newPos = lightPositions[i] + glm::vec3(sin(glfwGetTime() * 5.0) * 5.0, 0.0, 0.0);
newPos = lightPositions[i];
pbrShader.setVec3("lightPositions[" + std::to_string(i) + "]", newPos);
pbrShader.setVec3("lightColors[" + std::to_string(i) + "]", lightColors[i]);
model = glm::mat4();
model = glm::translate(model, newPos);
model = glm::scale(model, glm::vec3(0.5f));
pbrShader.setMat4("model", model);
renderSphere();
}
// render skybox (render as last to prevent overdraw)
backgroundShader.use();
backgroundShader.setMat4("view", view);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
//glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap); // display irradiance map
renderCube();
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
// -------------------------------------------------------------------------------
glfwSwapBuffers(window);
glfwPollEvents();
}
// glfw: terminate, clearing all previously allocated GLFW resources.
// ------------------------------------------------------------------
glfwTerminate();
return 0;
}
kit::Cubemap * kit::Cubemap::loadRadianceMap(const std::string& name)
{
kit::Cubemap * returner = new kit::Cubemap();
std::stringstream namer;
unsigned char* bufferdata;
int x, y, n;
glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
std::string datadir = "./data/env/";
returner->bind();
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAX_LEVEL, 5);
for(unsigned int i = 0; i < 6; i++)
{
stbi_set_flip_vertically_on_load(0);
// Z positive for Mip level 'i'
namer.str(std::string());
namer << datadir.c_str() << name.c_str() << "/rad_posz_" << i << ".tga";
bufferdata = stbi_load(namer.str().c_str(),&x, &y, &n, 4);
KIT_ASSERT(bufferdata != NULL);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, i, GL_SRGB8_ALPHA8, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
stbi_image_free(bufferdata);
// Z negative for Mip level 'i'
namer.str(std::string());
namer << datadir.c_str() << name.c_str() << "/rad_negz_" << i << ".tga";
bufferdata = stbi_load(namer.str().c_str(),&x, &y, &n, 4);
KIT_ASSERT(bufferdata != NULL);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, i, GL_SRGB8_ALPHA8, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
stbi_image_free(bufferdata);
// X positive for Mip level 'i'
namer.str(std::string());
namer << datadir.c_str() << name.c_str() << "/rad_posx_" << i << ".tga";
bufferdata = stbi_load(namer.str().c_str(),&x, &y, &n, 4);
KIT_ASSERT(bufferdata != NULL);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, i, GL_SRGB8_ALPHA8, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
stbi_image_free(bufferdata);
// X negative for Mip level 'i'
namer.str(std::string());
namer << datadir.c_str() << name.c_str() << "/rad_negx_" << i << ".tga";
bufferdata = stbi_load(namer.str().c_str(),&x, &y, &n, 4);
KIT_ASSERT(bufferdata != NULL);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, i, GL_SRGB8_ALPHA8, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
stbi_image_free(bufferdata);
// Y positive for Mip level 'i'
namer.str(std::string());
namer << datadir.c_str() << name.c_str() << "/rad_posy_" << i << ".tga";
bufferdata = stbi_load(namer.str().c_str(),&x, &y, &n, 4);
KIT_ASSERT(bufferdata != NULL);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, i, GL_SRGB8_ALPHA8, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
stbi_image_free(bufferdata);
// Y negative for Mip level 'i'
namer.str(std::string());
namer << datadir.c_str() << name.c_str() << "/rad_negy_" << i << ".tga";
//std::cout << "WOOT " << stbi_failure_reason() << " LOL " << namer.str().c_str() << std::endl;
bufferdata = stbi_load(namer.str().c_str(),&x, &y, &n, 4);
KIT_ASSERT(bufferdata != NULL);
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, i, GL_SRGB8_ALPHA8, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata);
stbi_image_free(bufferdata);
}
//returner->SetAnisotropicLevel(0.0);
returner->setFilteringMode(kit::Cubemap::Trilinear);
returner->setEdgeSamplingMode(kit::Cubemap::Clamp);
returner->m_resolution = glm::uvec2(x, y);
kit::Cubemap::unbind();
return returner;
}
int main() {
// INIT
glfwSetErrorCallback( error_callback );
/* Initialize the library */
if ( !glfwInit() ) {
return -1;
}
// must use exactly version 3
glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 3 );
glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 3 );
glfwWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );
glfwWindowHint( GLFW_RESIZABLE, GL_FALSE );
/* Create a windowed mode window and its OpenGL context */
window = glfwCreateWindow( WIDTH, HEIGHT, "Hello World", NULL, NULL );
if ( !window ) {
glfwTerminate();
return -1;
}
glfwMakeContextCurrent( window );
glfwSetKeyCallback( window, key_callback );
//glfwSetCursorPosCallback(window, cursor_position_callback);
glfwSetScrollCallback(window, scroll_callback);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
int count;
//printf( "%s\n", glfwGetVideoModes( glfwGetPrimaryMonitor(), &count ) );
glewExperimental = GL_TRUE;
if( glewInit() != GLEW_OK ) {
fprintf( stderr, "glewInit() failed\n" );
}
glViewport( 0, 0, WIDTH, HEIGHT );
glClearColor( 0.2f, 0.3f, 0.3f, 1.0f );
glEnable( GL_DEPTH_TEST );
// SHADER
Shader shader( "./vertexShader.glsl", "./fragmentShader.glsl" );
// Set up vertex data (and buffer(s)) and attribute pointers
GLfloat vertices[] = {
-1.0f, -1.0f, -1.0f, 1.0f, 0.0f,
-1.0f, -1.0f, 1.0f, 0.0f, 0.0f,
-1.0f, 1.0f, -1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f, 0.0f, 1.0f,
1.0f, -1.0f, -1.0f, 0.0f, 0.0f,
1.0f, -1.0f, 1.0f, 1.0f, 0.0f,
1.0f, 1.0f, -1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
};
GLuint indices[] = {
0, 1, 2,
1, 2, 3,
1, 3, 5,
3, 5, 7,
4, 5, 7,
4, 6, 7,
0, 4, 6,
0, 2, 6,
2, 3, 7,
2, 6, 7,
0, 1, 5,
0, 4, 5
};
// vertex buffer object (VBO)
// vertex array object (VAO)
GLuint VAO, VBO, EBO;
glGenVertexArrays( 1, &VAO );
glGenBuffers( 1, &VBO );
glGenBuffers( 1, &EBO );
// BIND the Vertex Array Object first, then bind and set vertex buffer(s) and attribute pointer(s).
glBindVertexArray( VAO );
glBindBuffer( GL_ARRAY_BUFFER, VBO );
glBufferData( GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, EBO );
glBufferData( GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW );
// void glVertexAttribPointer( GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid * pointer);
// the 0 for index comes from location = 0 in the vertex shader
glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0 );
glVertexAttribPointer( 1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)) );
glEnableVertexAttribArray( 0 );
glEnableVertexAttribArray( 1 );
glBindVertexArray( 0 );
stbi_set_flip_vertically_on_load(1);
// TEXTURE
GLuint texture;
glGenTextures(1, &texture);
//printf( "texture: %d\n", texture );
glBindTexture(GL_TEXTURE_2D, texture); // All upcoming GL_TEXTURE_2D operations now have effect on our texture object
// Set our texture parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); // Set texture wrapping to GL_REPEAT
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// Set texture filtering
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// Load, create texture and generate mipmaps
int width, height, comp;
unsigned char* image = stbi_load("./images/container.jpg", &width, &height, &comp, 3);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glGenerateMipmap(GL_TEXTURE_2D);
stbi_image_free(image);
glBindTexture(GL_TEXTURE_2D, 0);
GLuint texture1;
glGenTextures(1, &texture1);
//printf( "texture1: %d\n", texture1 );
glBindTexture(GL_TEXTURE_2D, texture1);
// Set our texture parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); // Set texture wrapping to GL_REPEAT
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// Set texture filtering
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// Load, create texture and generate mipmaps
image = stbi_load("./images/awesomeface.png", &width, &height, &comp, 3 );
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glGenerateMipmap(GL_TEXTURE_2D);
stbi_image_free(image);
glBindTexture(GL_TEXTURE_2D, 0);
glm::mat4 projection;
projection = glm::perspective( 45.0f, (GLfloat)WIDTH/HEIGHT, 0.1f, 100.0f );
/*
for( int y = 0; y < 4; ++y ) {
for( int x = 0; x < 4; ++x ) {
printf( "%f ", test[x][y] );
}
printf("\n");
}
*/
// Game loop
while( !glfwWindowShouldClose( window ) ) {
//for( int iter = 1; iter; --iter ) {
glfwPollEvents();
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glActiveTexture( GL_TEXTURE0 );
glBindTexture(GL_TEXTURE_2D, texture);
glUniform1i( glGetUniformLocation(shader.Program, "texture"), 0 );
glActiveTexture( GL_TEXTURE1 );
glBindTexture(GL_TEXTURE_2D, texture1);
glUniform1i( glGetUniformLocation(shader.Program, "texture1"), 1 );
glUseProgram( shader.Program );
glm::mat4 models[2];
models[0] = glm::translate( models[0], glm::vec3( 4.0f, 4.0f, -10.0f ) );
//models[1] = glm::translate( models[1], glm::vec3( -4.0f, -4.0f, -10.0f ) );
models[1] = glm::scale( models[1], glm::vec3( 50.0f, 50.0f, 50.0f ) );
updateCamera();
//glm::mat4 rotatedView = camera[1] * camera[0] * view;
printf( "rotation x %f, y %f, z %f\n", rotation.x, rotation.y, rotation.z );
glm::mat4 rotatedView;
rotatedView = glm::rotate( rotatedView, rotation.x, glm::vec3(1, 0, 0) ) ;
rotatedView = glm::rotate( rotatedView, rotation.y, glm::vec3(0, 1, 0) ) ;
rotatedView = glm::rotate( rotatedView, rotation.z, glm::vec3(0, 0, 1) ) ;
rotatedView *= view;
//view = glm::translate( view, position );
//glm::mat4 rotatedView;
//projection = glm::rotate( projection, glm::radians(cameraOrientation[1]), glm::vec3(1.0f, 0.0f, 0.0f) );
//projection = glm::rotate( projection, glm::radians(cameraOrientation[0]), glm::vec3(0.0f, 1.0f, 0.0f) );
//projection = projection * (cameraPosition / 10.0f);
glUniformMatrix4fv( glGetUniformLocation(shader.Program, "view" ), 1, GL_FALSE, glm::value_ptr(rotatedView) );
glUniformMatrix4fv( glGetUniformLocation(shader.Program, "projection" ), 1, GL_FALSE, glm::value_ptr(projection) );
for( int numBoxes = 0; numBoxes < 3; ++numBoxes ) {
glUniformMatrix4fv( glGetUniformLocation(shader.Program, "model" ), 1, GL_FALSE, glm::value_ptr(models[numBoxes]) );
glBindVertexArray( VAO );
//glDrawArrays( GL_TRIANGLES, 0, 3 );
glDrawElements( GL_TRIANGLES, 36, GL_UNSIGNED_INT, 0 );
glBindVertexArray( 0 );
}
glfwSwapBuffers( window );
fps();
printf("\n");
}
glDeleteVertexArrays( 1, &VAO );
glDeleteBuffers( 1, &VBO );
glfwDestroyWindow( window );
glfwTerminate();
return 0;
}
int main()
{
// glfw: initialize and configure
// ------------------------------
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // uncomment this statement to fix compilation on OS X
// glfw window creation
// --------------------
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
// glad: load all OpenGL function pointers
// ---------------------------------------
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
// build and compile our shader zprogram
// ------------------------------------
Shader ourShader("5.2.transform.vs", "5.2.transform.fs");
// set up vertex data (and buffer(s)) and configure vertex attributes
// ------------------------------------------------------------------
float vertices[] = {
// positions // texture coords
0.5f, 0.5f, 0.0f, 1.0f, 1.0f, // top right
0.5f, -0.5f, 0.0f, 1.0f, 0.0f, // bottom right
-0.5f, -0.5f, 0.0f, 0.0f, 0.0f, // bottom left
-0.5f, 0.5f, 0.0f, 0.0f, 1.0f // top left
};
unsigned int indices[] = {
0, 1, 3, // first triangle
1, 2, 3 // second triangle
};
unsigned int VBO, VAO, EBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
// position attribute
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
// texture coord attribute
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
// load and create a texture
// -------------------------
unsigned int texture1, texture2;
// texture 1
// ---------
glGenTextures(1, &texture1);
glBindTexture(GL_TEXTURE_2D, texture1);
// set the texture wrapping parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// set texture filtering parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// load image, create texture and generate mipmaps
int width, height, nrChannels;
stbi_set_flip_vertically_on_load(true); // tell stb_image.h to flip loaded texture's on the y-axis.
unsigned char *data = stbi_load(FileSystem::getPath("resources/textures/container.jpg").c_str(), &width, &height, &nrChannels, 0);
if (data)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
stbi_image_free(data);
// texture 2
// ---------
glGenTextures(1, &texture2);
glBindTexture(GL_TEXTURE_2D, texture2);
// set the texture wrapping parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// set texture filtering parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// load image, create texture and generate mipmaps
data = stbi_load(FileSystem::getPath("resources/textures/awesomeface.png").c_str(), &width, &height, &nrChannels, 0);
if (data)
{
// note that the awesomeface.png has transparency and thus an alpha channel, so make sure to tell OpenGL the data type is of GL_RGBA
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
stbi_image_free(data);
// tell opengl for each sampler to which texture unit it belongs to (only has to be done once)
// -------------------------------------------------------------------------------------------
ourShader.use();
ourShader.setInt("texture1", 0);
ourShader.setInt("texture2", 1);
// render loop
// -----------
while (!glfwWindowShouldClose(window))
{
// input
// -----
processInput(window);
// render
// ------
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
// bind textures on corresponding texture units
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture1);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, texture2);
glm::mat4 transform;
// first container
// ---------------
transform = glm::translate(transform, glm::vec3(0.5f, -0.5f, 0.0f));
transform = glm::rotate(transform, (float)glfwGetTime(), glm::vec3(0.0f, 0.0f, 1.0f));
// get their uniform location and set matrix (using glm::value_ptr)
unsigned int transformLoc = glGetUniformLocation(ourShader.ID, "transform");
glUniformMatrix4fv(transformLoc, 1, GL_FALSE, glm::value_ptr(transform));
// with the uniform matrix set, draw the first container
glBindVertexArray(VAO);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
// second transformation
// ---------------------
transform = glm::mat4(); // reset it to an identity matrix
transform = glm::translate(transform, glm::vec3(-0.5f, 0.5f, 0.0f));
float scaleAmount = sin(glfwGetTime());
transform = glm::scale(transform, glm::vec3(scaleAmount, scaleAmount, scaleAmount));
glUniformMatrix4fv(transformLoc, 1, GL_FALSE, &transform[0][0]); // this time take the matrix value array's first element as its memory pointer value
// now with the uniform matrix being replaced with new transformations, draw it again.
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
// -------------------------------------------------------------------------------
glfwSwapBuffers(window);
glfwPollEvents();
}
// optional: de-allocate all resources once they've outlived their purpose:
// ------------------------------------------------------------------------
glDeleteVertexArrays(1, &VAO);
glDeleteBuffers(1, &VBO);
glDeleteBuffers(1, &EBO);
// glfw: terminate, clearing all previously allocated GLFW resources.
// ------------------------------------------------------------------
glfwTerminate();
return 0;
}
