glew + sdl problems

OpenGL OpenGL: Basic Coding
1

Hi!
i got some problems with glew.


#include <Windows.h>
#include <SDL.h>
#include "Settings.h"
#include "Buffer.h"
#include <GL/glew.h>

int WINAPI WinMain(	HINSTANCE hInstance,
					HINSTANCE hPrevInstance,
					LPSTR lpCmdLine,
					int nCmdShow )
{
	bool running=true;
	SDL_Surface *screen;
	SDL_Event event;

	//Settings::read();
	// ----- SDL init ---------------
	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
		fprintf(stderr, "Video initialization failed: %s
", SDL_GetError());
		exit(-1);
	}

	atexit(SDL_Quit);
	// ----- OpenGL attribute setting via SDL ---------------
	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
	SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 0);
	SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);

	// ----- Setting up the screen surface ---------------
	if ((screen = SDL_SetVideoMode(Settings::RESOLUTION_WIDTH, Settings::RESOLUTION_HEIGHT, 0, SDL_OPENGL)) == 0) {
		fprintf(stderr, "Video mode set failed: %s
", SDL_GetError());
        	exit(-1);
	}
	GLenum err = glewInit();
	if (GLEW_OK != err)
	{
		MessageBox(0,"error", "err", MB_OK);
		return 0;
	}
	if (GLEW_VERSION_1_3)
	{
		MessageBox(0,"asdf", "asdf", MB_OK);
	}
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
	while (running) {
		
		while (SDL_PollEvent(&event)) {
			switch (event.type) {
			case SDL_QUIT:
				running = false;
				break;
			}
		}
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		SDL_GL_SwapBuffers();
	}
	return 1;
}

compiles fine, also runs, but it says gl version 1.3 is not available (but i even got gl 4.0 running on my pc). things like glClear also work, but when i use glGenFramebuffersEXT(1, &id); e.g. i get a runtime error.

did i miss something? what could be the problem?

2

We can’t see pertinent lines in your code about what you’re talking about (FBO). So we can’t really help you there.

3

well it’s already strange that it doesn’t show the message box

if (GLEW_VERSION_1_3)
	{
		MessageBox(0,"asdf", "asdf", MB_OK);
	}

and for the FBO i did it in another file


glGenFramebuffersEXT(1, &id);
	glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, id);
	if(flags & BUFFER_DEPTH){
		glGenFramebuffersEXT(1, &depth);
		glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, w, h);
		glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depth);
	}
	if(flags & BUFFER_COLOR){
		glGenTextures(1, &color0);
		glBindTexture(GL_TEXTURE_2D, color0);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8,  w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
		glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, color0, 0);
	}

where w, h are integer and id,depth,color are GLuint.