82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
// main.c
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "gl_utils.h"
|
|
|
|
int main(void) {
|
|
int winW = 800;
|
|
int winH = 600;
|
|
|
|
GLFWwindow* window = init_glfw_glad("Falling Sand - Fullscreen Quad", winW, winH);
|
|
if (!window) {
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
printf("Renderer: %s\n", (const char*)glGetString(GL_RENDERER));
|
|
printf("OpenGL: %s\n", (const char*)glGetString(GL_VERSION));
|
|
printf("GLSL: %s\n", (const char*)glGetString(GL_SHADING_LANGUAGE_VERSION));
|
|
|
|
// --- Create fullscreen triangle geometry (VAO + VBO) ---
|
|
float vertices[] = {
|
|
// x, y
|
|
-1.0f, -1.0f,
|
|
3.0f, -1.0f,
|
|
-1.0f, 3.0f
|
|
};
|
|
|
|
GLuint vao = 0, vbo = 0;
|
|
glGenVertexArrays(1, &vao);
|
|
glGenBuffers(1, &vbo);
|
|
|
|
glBindVertexArray(vao);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, vbo);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
|
|
|
|
// layout(location = 0) in vec2 aPos;
|
|
glEnableVertexAttribArray(0);
|
|
glVertexAttribPointer(
|
|
0,
|
|
2,
|
|
GL_FLOAT,
|
|
GL_FALSE,
|
|
2 * sizeof(float),
|
|
(void*)0
|
|
);
|
|
|
|
glBindVertexArray(0);
|
|
|
|
// --- Create shader program ---
|
|
GLuint program = create_program_from_files(
|
|
"shaders/fullscreen.vert",
|
|
"shaders/gradient.frag"
|
|
);
|
|
|
|
glUseProgram(program);
|
|
|
|
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
|
|
|
|
// --- Main loop ---
|
|
while (!glfwWindowShouldClose(window)) {
|
|
glfwPollEvents();
|
|
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
glUseProgram(program);
|
|
glBindVertexArray(vao);
|
|
glDrawArrays(GL_TRIANGLES, 0, 3);
|
|
|
|
glfwSwapBuffers(window);
|
|
}
|
|
|
|
// --- Cleanup ---
|
|
glDeleteProgram(program);
|
|
glDeleteBuffers(1, &vbo);
|
|
glDeleteVertexArrays(1, &vao);
|
|
|
|
glfwDestroyWindow(window);
|
|
glfwTerminate();
|
|
return EXIT_SUCCESS;
|
|
}
|