/**
* Updates all vertex attributes.
* This is used when BindingLocation changes after a shader recompile.
*/
void GLVertexAttributeArray::UpdateVertexAttributes()
{
OGL_CALL(glBindBuffer, GL_ARRAY_BUFFER, v_buffer);
OGL_CALL(glBindVertexArray, vao);
OGL_CALL(glBindBuffer, GL_ELEMENT_ARRAY_BUFFER, i_buffer);
for (const auto& desc : v_desc) {
if (desc.location->iBinding > 0) {
OGL_CALL(glEnableVertexAttribArray, desc.location->iBinding);
switch (desc.shaderType)
{
case VAShaderType::FLOAT:
OGL_CALL(glVertexAttribPointer, desc.location->iBinding, desc.size,
desc.type, desc.normalized, desc.stride,
(static_cast<char*> (nullptr)) + desc.offset);
break;
case VAShaderType::INTEGER:
OGL_CALL(glVertexAttribIPointer, desc.location->iBinding, desc.size,
desc.type, desc.stride, (static_cast<char*> (nullptr)) + desc.offset);
break;
case VAShaderType::DOUBLE:
OGL_CALL(glVertexAttribLPointer, desc.location->iBinding, desc.size,
desc.type, desc.stride, (static_cast<char*> (nullptr)) + desc.offset);
break;
}
}
}
OGL_CALL(glBindVertexArray, 0);
OGL_CALL(glBindBuffer, GL_ARRAY_BUFFER, 0);
}
/** Disables all vertex attributes in the array. */
void GLVertexAttributeArray::DisableAttributes()
{
OGL_CALL(glBindVertexArray, vao);
OGL_CALL(glBindBuffer, GL_ELEMENT_ARRAY_BUFFER, 0);
for (const auto& desc : v_desc) {
if (desc.location->iBinding > 0) {
OGL_CALL(glDisableVertexAttribArray, desc.location->iBinding);
}
}
OGL_CALL(glBindVertexArray, 0);
}
/**
* Adds a new double attribute to the vertex.
* @param location the binding location
* @param size the number of components in the attribute
* @param type the type in which the data is stored in the vertex buffer
* @param stride the difference in bytes between of this attributes
* @param offset the offset into the buffer to the first of this attributes
*/
void GLVertexAttributeArray::AddVertexAttributeL(BindingLocation location, int size, GLenum type,
GLsizei stride, unsigned int offset)
{
vertex_attribute_desc desc;
desc.shaderType = VAShaderType::DOUBLE;
desc.location = location;
desc.size = size;
desc.type = type;
desc.stride = stride;
desc.offset = offset;
v_desc.push_back(std::move(desc));
OGL_CALL(glEnableVertexAttribArray, location->iBinding);
OGL_CALL(glVertexAttribLPointer, location->iBinding, size, type, stride,
(static_cast<char*> (nullptr)) + offset);
}
void Shader::UnloadLocal()
{
if (this->shader != 0) {
OGL_CALL(glDeleteShader, shader);
shader = 0;
}
}
void ForwardRenderer::Render()
{
auto totalObjects = scene->GetTotalObjects();
auto totalLights = scene->GetTotalLights();
auto totalRenderingPasses = totalLights + 2;
// Render passes:
// 0 - Depth Prepass
// 1 - Global Light for the Objects (Ambient, Emissive)
// Rest - Diffuse/Specular/etc Lighting for Objects
for (decltype(totalRenderingPasses) p = 0; p < totalRenderingPasses; ++p) {
OGL_CALL(glDepthMask((p == 0) ? GL_TRUE : GL_FALSE));
bool writeToColor = (p == 0) ? GL_FALSE: GL_TRUE;
OGL_CALL(glColorMask(writeToColor, writeToColor, writeToColor, writeToColor));
for (decltype(totalObjects) i = 0; i < totalObjects; ++i) {
const SceneObject& sceneObject = scene->GetSceneObject(i);
auto totalRenderObjects = sceneObject.GetTotalRenderObjects();
for (decltype(totalRenderObjects) r = 0; r < totalRenderObjects; ++r) {
const RenderingObject* renderObject = sceneObject.GetRenderObject(r);
if (!renderObject) {
continue;
}
const ShaderProgram* shaderToUse = renderObject->GetShaderProgramRaw();
assert(shaderToUse);
shaderToUse->StartUseShader();
renderObject->BeginRender();
// Make the scene object setup its shader with any data its shader might need.
// Start from the end because the very 'last' light handles the global lighting for the object.
// A light that is a nullptr will cause the shader to perform default behavior, whatever that may be.
const Light* lightObject = scene->GetLightObject(totalRenderingPasses - p - 1);
if (shaderToUse->IsAffectedByLight(lightObject)) {
sceneObject.PrepareShaderForRendering(shaderToUse, camera.get(), lightObject);
renderObject->Render();
}
renderObject->EndRender();
shaderToUse->StopUseShader();
}
}
}
OGL_CALL(glDepthMask(GL_TRUE));
}
Texture2D::Texture2D(GLubyte* rawData, int width, int height):
Texture(GL_TEXTURE_2D), texWidth(width), texHeight(height)
{
OGL_CALL(glGenTextures(1, &glTexture));
OGL_CALL(glBindTexture(GL_TEXTURE_2D, glTexture));
OGL_CALL(glTexStorage2D(GL_TEXTURE_2D, 4, GL_RGBA8, texWidth, texHeight));
OGL_CALL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, texWidth, texHeight, GL_RGBA, GL_UNSIGNED_BYTE, rawData));
// Would be useful to expose these settings!
OGL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
OGL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
OGL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT));
OGL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT));
OGL_CALL(glGenerateMipmap(GL_TEXTURE_2D));
OGL_CALL(glBindTexture(GL_TEXTURE_2D, 0));
}
/**
* Constructor.
* @param vertexBuffer the vertex buffer used to create the attributes.
* @param indexBuffer the index buffer to bind
*/
GLVertexAttributeArray::GLVertexAttributeArray(GLuint vertexBuffer, GLuint indexBuffer) :
vao(0),
i_buffer(indexBuffer),
v_buffer(vertexBuffer),
v_desc()
{
OGL_CALL(glGenVertexArrays, 1, &vao);
}
void BlinnPhongShader::UpdateMaterialBlock() const
{
StartUseShader();
memcpy((void*)(materialStorage.data() + materialOffsets[0]), glm::value_ptr(diffuse), sizeof(glm::vec4));
memcpy((void*)(materialStorage.data() + materialOffsets[1]), glm::value_ptr(specular), sizeof(glm::vec4));
memcpy((void*)(materialStorage.data() + materialOffsets[2]), &shininess, sizeof(float));
memcpy((void*)(materialStorage.data() + materialOffsets[3]), glm::value_ptr(ambient), sizeof(glm::vec4));
if (materialBuffer && materialBlockLocation != GL_INVALID_INDEX) {
OGL_CALL(glBindBuffer(GL_UNIFORM_BUFFER, materialBuffer));
OGL_CALL(glBufferData(GL_UNIFORM_BUFFER, materialBlockSize, materialStorage.data(), GL_STATIC_DRAW));
OGL_CALL(glBindBufferBase(GL_UNIFORM_BUFFER, MATERIAL_BINDING_POINT, materialBuffer));
OGL_CALL(glUniformBlockBinding(shaderProgram, materialBlockLocation, MATERIAL_BINDING_POINT));
OGL_CALL(glBindBuffer(GL_UNIFORM_BUFFER, 0));
}
StopUseShader();
}
void EpicShader::SetupShaderMaterials() const
{
// Need to make sure the material buffer is bound.
OGL_CALL(glBindBufferBase(GL_UNIFORM_BUFFER, MATERIAL_BINDING_POINT, materialBuffer));
// Make sure the right textures are bound.
const Texture* diffuseTexture = defaultTexture.get();
if (textureSlotMapping.find(TextureSlots::DIFFUSE) != textureSlotMapping.end()) {
diffuseTexture = textureSlotMapping.at(TextureSlots::DIFFUSE).get();
}
assert(diffuseTexture);
diffuseTexture->BeginRender(static_cast<int>(TextureSlots::DIFFUSE));
// While we're here, also setup the textures too.
SetShaderUniform("diffuseTexture", static_cast<int>(TextureSlots::DIFFUSE));
}
void MediaLayer::InitializeOpenGL()
{
if (!sdlInitialized) {
std::cerr << "ERROR: Can not initialize OpenGL before setting up SDL." << std::endl;
return;
}
glContext = SDL_GL_CreateContext(sdlWindow);
if (glContext == NULL) {
std::cerr << "ERROR: SDL failed to create an OpenGL context" << std::endl;
return;
}
// 0 - Disables Vsync, 1 - Enables Vsync
// More information: https://www.opengl.org/wiki/Swap_Interval
// Documentation: https://wiki.libsdl.org/SDL_GL_SetSwapInterval
SDL_GL_SetSwapInterval(0);
// Initialize GLEW
glewExperimental = GL_TRUE;
GLenum err = glewInit();
if (err != GLEW_OK) {
std::cerr << "ERROR: GLEW failed to initialize." << std::endl;
return;
}
// At this point we want to flush out all of the OpenGL errors that might have been caused by GLEW.
while ((err = glGetError()) != GL_NO_ERROR);
openglInitialized = true;
// Sane default settings for OpenGL rendering
OGL_CALL(glEnable(GL_DEPTH_TEST));
OGL_CALL(glDepthFunc(GL_LEQUAL));
OGL_CALL(glEnable(GL_BLEND));
OGL_CALL(glBlendFunc(GL_ONE, GL_ONE));
OGL_CALL(glEnable(GL_CULL_FACE));
OGL_CALL(glCullFace(GL_BACK));
OGL_CALL(glClearColor(0.0f, 0.0f, 0.0f, 1.0f));
}
/**
* Loads a shader from file and compiles it.
* @param filename the shaders file name
* @param type the shaders type
* @param strType the shaders type as string
* @return the compiled shader if successful
*/
GLuint Shader::CompileShader(const std::string& filename, const std::vector<std::string>& defines, GLenum type, const std::string& strType) const
{
unsigned int firstFileId = 0;
if (!boost::filesystem::exists(filename)) {
LOG(ERROR) << "Cannot open shader file \"" << filename.c_str() << "\".";
throw resource_loading_error() << ::boost::errinfo_file_name(filename) << fileid_info(firstFileId) << resid_info(id)
<< errdesc_info("Cannot open shader file.");
}
auto shaderText = LoadShaderFile(filename, defines, firstFileId, 0);
auto shader = OGL_CALL(glCreateShader, type);
if (shader == 0) {
LOG(ERROR) << L"Could not create shader!";
throw std::runtime_error("Could not create shader!");
}
auto shaderTextArray = shaderText.c_str();
auto shaderLength = static_cast<int>(shaderText.length());
OGL_CALL(glShaderSource, shader, 1, &shaderTextArray, &shaderLength);
OGL_CALL(glCompileShader, shader);
GLint status;
OGL_CALL(glGetShaderiv, shader, GL_COMPILE_STATUS, &status);
if (status == GL_FALSE) {
GLint infoLogLength;
OGL_CALL(glGetShaderiv, shader, GL_INFO_LOG_LENGTH, &infoLogLength);
auto strInfoLog = new GLchar[infoLogLength + 1];
OGL_CALL(glGetShaderInfoLog, shader, infoLogLength, NULL, strInfoLog);
std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
LOG(ERROR) << L"Compile failure in " << converter.from_bytes(strType) << L" shader ("
<< filename.c_str() << "): " << std::endl << strInfoLog;
std::string infoLog = strInfoLog;
delete[] strInfoLog;
OGL_CALL(glDeleteShader, shader);
throw shader_compiler_error() << ::boost::errinfo_file_name(filename)
<< compiler_error_info(infoLog) << resid_info(id)
<< errdesc_info("Shader compilation failed.");
}
return shader;
}
BlinnPhongShader::~BlinnPhongShader()
{
OGL_CALL(glDeleteBuffers(1, &materialBuffer));
}
/** Disables the vertex attribute array. */
void GLVertexAttributeArray::DisableVertexAttributeArray() const
{
OGL_CALL(glBindVertexArray, 0);
}
/** Enables the vertex attribute array. */
void GLVertexAttributeArray::EnableVertexAttributeArray() const
{
OGL_CALL(glBindVertexArray, vao);
}
/** Ends the vertex attribute setup. */
void GLVertexAttributeArray::EndAttributeSetup() const
{
OGL_CALL(glBindBuffer, GL_ELEMENT_ARRAY_BUFFER, i_buffer);
OGL_CALL(glBindVertexArray, 0);
OGL_CALL(glBindBuffer, GL_ELEMENT_ARRAY_BUFFER, 0);
}
GLVertexAttributeArray::~GLVertexAttributeArray()
{
if (vao != 0) {
OGL_CALL(glDeleteVertexArrays, 1, &vao);
}
}
EpicShader::~EpicShader()
{
OGL_CALL(glDeleteBuffers(1, &materialBuffer));
}
/** Initializes the vertex attribute setup. */
void GLVertexAttributeArray::StartAttributeSetup() const
{
OGL_CALL(glBindVertexArray, vao);
OGL_CALL(glBindBuffer, GL_ELEMENT_ARRAY_BUFFER, 0);
}
