118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
// Include standard headers
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#include <stdio.h>
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#include <stdlib.h>
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// Include GLEW
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#include <GL/glew.h>
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// Include GLFW
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#include <GLFW/glfw3.h>
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// Include shader
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#include "shader.h"
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GLFWwindow* window;
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int main(void) {
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// Initialise GLFW
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if(!glfwInit()) {
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fprintf(stderr, "Failed to initialize GLFW\n");
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getchar();
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return -1;
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}
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glfwWindowHint(GLFW_SAMPLES, 4);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // To make MacOS happy; should not be needed
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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// Open a window and create its OpenGL context
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window = glfwCreateWindow(1024, 768, "OpenGL Clock", NULL, NULL);
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if (window == NULL) {
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fprintf(stderr, "Failed to open GLFW window. If you have an Intel GPU, they are not 3.3 compatible. Try the 2.1 version of the tutorials.\n");
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getchar();
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glfwTerminate();
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return -1;
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}
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glfwMakeContextCurrent(window);
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// Initialize GLEW
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if (glewInit() != GLEW_OK) {
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fprintf(stderr, "Failed to initialize GLEW\n");
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getchar();
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glfwTerminate();
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return -1;
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}
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// Ensure we can capture the escape key being pressed below
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glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);
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// Dark grey background
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glClearColor(0.15f, 0.15f, 0.15f, 0.0f);
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GLuint VertexArrayID;
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glGenVertexArrays(1, &VertexArrayID);
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glBindVertexArray(VertexArrayID);
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// Create and compile our GLSL program from the shaders
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GLuint programID;
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if (LoadShaders(&programID,
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"../shaders/SimpleVertexShader.vertexshader",
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"../shaders/SimpleFragmentShader.fragmentshader")) {
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fprintf(stderr, "Could not load shaders.\n");
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return -1;
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}
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static const GLfloat g_vertex_buffer_data[] = {
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-1.0f, -1.0f, 0.0f,
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1.0f, -1.0f, 0.0f,
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0.0f, 1.0f, 0.0f
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};
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GLuint vertexbuffer;
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glGenBuffers(1, &vertexbuffer);
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glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
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glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW);
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do {
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// Clear the screen. It's not mentioned before Tutorial 02,
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// but it can cause flickering, so it's there nonetheless.
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glClear(GL_COLOR_BUFFER_BIT);
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// Use our shader
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glUseProgram(programID);
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// 1rst attribute buffer : vertices
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glEnableVertexAttribArray(0);
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glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
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glVertexAttribPointer(
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0, // attribute 0. No particular reason for 0, but must match the layout in the shader.
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3, // size
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GL_FLOAT, // type
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GL_FALSE, // normalized?
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0, // stride
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NULL // array buffer offset
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);
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// Draw the triangle !
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glDrawArrays(GL_TRIANGLES, 0, 3); // 3 indices starting at 0 -> 1 triangle
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glDisableVertexAttribArray(0);
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// Swap buffers
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glfwSwapBuffers(window);
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glfwPollEvents();
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// Check if the ESC key was pressed or the window was closed
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} while(glfwGetKey(window, GLFW_KEY_ESCAPE) != GLFW_PRESS &&
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glfwWindowShouldClose(window) == 0);
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// Close OpenGL window and terminate GLFW
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glfwTerminate();
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return 0;
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}
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