void Shadertoy::loop() {
GLuint points_vbo;
glGenBuffers (1, &points_vbo);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glBufferData (GL_ARRAY_BUFFER, sizeof(points), points, GL_STATIC_DRAW);
GLuint vao;
glGenVertexArrays (1, &vao);
glBindVertexArray (vao);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
if (!loadFromFile()) {
compileShaders(vertexSource, fragmentSource);
}
auto pos = glGetAttribLocation(program, "position");
glEnableVertexAttribArray (pos);
auto time = glGetUniformLocation(program, "global_time");
auto resolution = glGetUniformLocation(program, "resolution");
glUseProgram(program);
while (!glfwWindowShouldClose(win)) {
glfwGetWindowSize(win, &g_width, &g_heigth);
updateFpsCounter();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport(0, 0, g_width, g_heigth);
auto current_time = glfwGetTime();
glUniform1f(time, current_time);
glUniform2f(resolution, g_width, g_heigth);
if(recompile) {
loadFromFile();
glUseProgram(program);
recompile = false;
}
glBindVertexArray (vao);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 6);
glfwPollEvents();
glfwSwapBuffers(win);
}
}
int main(int argc, char *argv[])
{
//start context
if (!glfwInit())
{
fprintf(stderr, "Error, could not start GLFW3\n");
return 1;
}
else
{
fprintf(stderr, "GLFW initialized properly.");
}
//Forward compatibility from version 3.2.
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_SAMPLES, 4); //Anti aliasing (4 passes)
//start logs
Logger::restartLog(GL_LOG_FILE);
glfwSetErrorCallback(glfwErrorCallback);
GLFWmonitor* monitor = glfwGetPrimaryMonitor();
const GLFWvidmode* mode = glfwGetVideoMode(monitor);
//init window with primary monitor resolution
//Set these modes for a fullscreen window and don't for classic fullscreen:
/*glfwWindowHint(GLFW_RED_BITS, mode->redBits);
glfwWindowHint(GLFW_GREEN_BITS, mode->greenBits);
glfwWindowHint(GLFW_BLUE_BITS, mode->blueBits);
glfwWindowHint(GLFW_REFRESH_RATE, mode->refreshRate);*/
//------------------------------------------------
//GLFWwindow * window = glfwCreateWindow(mode->width, mode->height, "Tutorial 1: Draw a triangle", monitor, NULL); //Fullscreen
GLFWwindow * window = glfwCreateWindow(800, 600, "Tutorial 1: Draw a triangle", NULL, NULL); //Not Fullscreen
//if window initialisation failed
if (!window)
{
fprintf(stderr, "Could not open window with GLFW3\n");
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
glfwSetWindowSizeCallback(window, glfwWindowSizeCallback);
//start glew extension handler;
glewExperimental = GL_TRUE;
glewInit();
//get version info
const GLubyte * renderer = glGetString(GL_RENDERER);
const GLubyte * version = glGetString(GL_VERSION);
//Log informations
Logger::printToLog(GL_LOG_FILE, "Starting GLFW: %s \n", glfwGetVersionString());
logGlParams();
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
//draw triangle
initTriangles();
Shader vertex = Shader("vertex.vert", GL_VERTEX_SHADER);
Shader frag_1 = Shader("frag1.frag", GL_FRAGMENT_SHADER);
Shader frag_2 = Shader("frag2.frag", GL_FRAGMENT_SHADER);
Shader shaders_1[2] = { vertex, frag_1 };
Shader shaders_2[2] = { vertex, frag_2 };
ShaderProgram shader_programme_1 = ShaderProgram(shaders_1, VERT_FRAG);
ShaderProgram shader_programme_2 = ShaderProgram(shaders_2, VERT_FRAG);
while (!glfwWindowShouldClose(window)) {
updateFpsCounter(window);
// wipe the drawing surface clear
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport(0, 0, g_gl_width, g_gl_height);
glClearColor(0.1f, 0.1f, 0.1f, 0.0f);
glUseProgram(shader_programme_1.get_program());
glBindVertexArray(vao_1);
// draw points 0-5 from the currently bound VAO with current in-use shader
glDrawArrays(GL_TRIANGLES, 0, 6);
glUseProgram(shader_programme_2.get_program());
glBindVertexArray(vao_2);
// draw points 0-5 from the currently bound VAO with current in-use shader
glDrawArrays(GL_TRIANGLES, 0, 3);
// update other events like input handling
glfwPollEvents();
// put the stuff we've been drawing onto the display
glfwSwapBuffers(window);
if (GLFW_PRESS == glfwGetKey(window, GLFW_KEY_ESCAPE))
{
glfwSetWindowShouldClose(window, 1);
}
}
//close gl context and other glfw resources
glfwTerminate();
return 0;
}