OpenGL Black Screen on M2 Macbook - c

Question

I have been trying to create a basic OpenGL program in C to display a triangle. Except all I am getting is a black screen.
main.c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
//#include <GL/glew.h>
#define GL_SILENCE_DEPRECATION
#include "win.h"
#include "shaders/cshader.h"
#include "glew.h"
#define GLFW_INCLUDE_GLCOREARB
#include "glfw3.h"
#include <OpenGL/gl3.h>
int main(void) {
if( !glfwInit()) {
fprintf( stderr, "Failed to initialize GLFW\n" );
return -1;
}
// create window
GLFWwindow* window = createWindow(1280,720);
glewExperimental=GL_TRUE; // Needed in core profile
if (glewInit() != GLEW_OK) {
fprintf(stderr, "Failed to initialize GLEW\n");
return -1;
}
glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);
GLuint VertexArrayID;
glGenVertexArrays(1, &VertexArrayID);
glBindVertexArray(VertexArrayID);
static const GLfloat g_vertex_buffer_data[] = {
-1.0f, -1.0f, 0.0f,
1.0f, -1.0f, 0.0f,
0.0f, 1.0f, 0.0f,
};
// This will identify our vertex buffer
GLuint vertexbuffer;
// Generate 1 buffer, put the resulting identifier in vertexbuffer
glGenBuffers(1, &vertexbuffer);
// The following commands will talk about our 'vertexbuffer' buffer
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
// Give our vertices to OpenGL.
glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW);
Shader shader = ShaderInit();
shader.Load(&shader,"/Users/***/Desktop/coding/gl_test/shaders/tri.vert","/Users/***/Desktop/coding/gl_test/shaders/tri.frag");
glUseProgram(shader.program);
glClearColor(0.0f, 0.0f, 0.4f, 0.0f);
glfwMakeContextCurrent(window);
do{
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glVertexAttribPointer(
0, // attribute 0. No particular reason for 0, but must match the layout in the shader.
3, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
(void*)0 // array buffer offset
);
// Draw the triangle !
// Starting from vertex 0; 3 vertices total -> 1 triangle
glUseProgram(shader.program);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(0);
// Swap buffers
if (glGetError() != GL_NO_ERROR){
printf("Err");
}
glfwSwapBuffers(window);
glfwPollEvents();
} // Check if the ESC key was pressed or the window was closed
while( glfwGetKey(window, GLFW_KEY_ESCAPE ) != GLFW_PRESS &&
glfwWindowShouldClose(window) == 0 );
return 0;
}
win.c
#include <stdio.h>
#include <stdlib.h>
#include "/Users/***/Downloads/glew-2.1.0/include/GL/glew.h"
#include "/opt/homebrew/Cellar/glfw/3.3.8/include/GLFW/glfw3.h"
GLFWwindow* createWindow(int WIDTH, int HEIGHT){
glfwWindowHint(GLFW_SAMPLES, 4); // 4x antialiasing
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4); // We want OpenGL 4.1
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // To make MacOS happy; should not be needed
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); // We don't want the old OpenGL
// Open a window and create its OpenGL context
GLFWwindow* window; // (In the accompanying source code, this variable is global for simplicity)
window = glfwCreateWindow( WIDTH, HEIGHT, "graphic", NULL, NULL);
if( window == NULL ){
fprintf(stderr, "Failed to open GLFW window. If you have an Intel GPU, they are not 3.3 compatible.\n" );
glfwTerminate();
return NULL;
}
glfwMakeContextCurrent(window);// Initialize GLEW
glfwPollEvents();
return window;
}
The shader program is basic and it compiles and links correctly. I have a vertex and fragment shader that should make the triangle red.
Even if it is broken, I should still be getting a colored screen because of glClear and glClearColor.
I have tried changing opengl versions as well as linking different files, but nothing shows up.
Here is my makefile:
LIBS=-L/opt/homebrew/lib -L/Users/***/Downloads/glew-2.1.0/lib -lGL -lglew
INC=-I/Users/***/Downloads/glew-2.1.0/include
main:
gcc main.c win.c shaders/cshader.c `pkg-config --cflags glfw3` $(LIBS) $(INC) -g -Wall -framework Cocoa -framework OpenGL `pkg-config --libs glfw3` -o test
Everything appears to link and compile without errors. What should I do.
(I know OpenGL is deprecated on new MacOS versions, but lots of people say that at least basic functionality still works)