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C version of test program without GLEW.

test2winglctx.c (text/plain), 2.26 KB, created by Ryan C. Gordon on 2013-07-31 22:37:32 UTC

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Description:

Filename:

MIME Type:

Creator: Ryan C. Gordon

Created: 2013-07-31 22:37:32 UTC

Size: 2.26 KB

patch

obsolete

>
>#define WIN32_LEAN_AND_MEAN 1
>#include <windows.h>
>
>#include "SDL.h"
>#include <GL/GL.h>
>
>#define GL_VERTEX_SHADER 0x8B31
>
>//#include <GL/glew.h>
>//#include <iostream>
>
>
>int main( int argc, char* argv[] )
>{	
>	unsigned int flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN;
>SDL_Window* window1;
>SDL_Window* window2;
>SDL_GLContext context;
>GLuint (*glCreateShader)(GLenum x);
>GLuint shader1;
>GLuint shader2;
>
>	if (SDL_Init(SDL_INIT_VIDEO) == -1) {
>		return -1;
>	}
>
>SDL_GL_LoadLibrary(NULL);
>
>	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
>	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
>
>	SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1);
>	SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 );
>	SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 );
>	SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 );
>	SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 );
>
>	//Creating my first window here.
>	window1 = SDL_CreateWindow("TestWindow", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,  800, 600, flags);
>
>	//Creating a graphics context
>	context = SDL_GL_CreateContext(window1);
>//	glewExperimental= GL_TRUE;
>//	GLenum err = glewInit();
>
>glCreateShader = (GLuint (*)(GLenum)) SDL_GL_GetProcAddress("glCreateShader");
>
>	//Trying my first call to glCreateShader. This works.
>	shader1 = glCreateShader(GL_VERTEX_SHADER);
>	
>	if (shader1 == 0)
>		OutputDebugStringA("shader 1 failed\r\n");
>	else
>		OutputDebugStringA("shader 1 worked\r\n");
>
>	//Creating a second window gives a context problem.
>	window2 = SDL_CreateWindow("TestWindow", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,  800, 600, flags);
>
>	//Re-creating the context "fixes" the problem (uncomment next line)
>	//context = SDL_GL_CreateContext(window1);
>	
>	//This, doesn't help.
>	SDL_GL_MakeCurrent(window1, context);
>
>	//However this also "fixes" the problem: (uncomment next 2 lines)
>	//SDL_GL_MakeCurrent(window2, context);
>	//SDL_GL_MakeCurrent(window1, context);
>
>    //After creating the second window, this call will fail, unless one of the above mentioned "fixes" is used.
>	shader2 = glCreateShader(GL_VERTEX_SHADER);
>		
>	if (shader2 == 0)
>		OutputDebugStringA("shader 2 failed\r\n");
>	else
>		OutputDebugStringA("shader 2 worked\r\n");
>
>    SDL_Quit();
>	return 0;
>}
>
>/* vi: set ts=4 sw=4 expandtab: */

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We are currently migrating Bugzilla to GitHub issues.Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.