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Short Context problem sample program.

SDL_Context_Bug.cpp (text/plain), 1.96 KB, created by wracky on 2012-01-23 14:36:12 UTC

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Description:

Filename:

MIME Type:

Creator: wracky

Created: 2012-01-23 14:36:12 UTC

Size: 1.96 KB

patch

obsolete

>
>#include <SDL.h>
>#include <GL/glew.h>
>#include <iostream>
>
>
>int main( int argc, char* argv[] )
>{	
>
>	if (SDL_Init(SDL_INIT_VIDEO) == -1) {
>		return -1;
>	}
>
>	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 );
>
>	unsigned int flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN;
>
>	//Creating my first window here.
>	SDL_Window* window1 = SDL_CreateWindow("TestWindow", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,  800, 600, flags);
>
>	//Creating a graphics context
>	SDL_GLContext context = SDL_GL_CreateContext(window1);
>	glewExperimental= GL_TRUE;
>	GLenum err = glewInit();
>
>	//Trying my first call to glCreateShader. This works.
>	GLint shader1 = glCreateShader(GL_VERTEX_SHADER);
>	
>	if (shader1 == 0)
>		std::cerr << "shader 1 failed" << std::endl;
>	else
>		std::cerr << "shader 1 worked" << std::endl; // Ends up here.
>
>
>	//Creating a second window gives a context problem.
>	SDL_Window* 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.
>	GLint shader2 = glCreateShader(GL_VERTEX_SHADER);
>		
>	if (shader2 == 0)
>		std::cerr << "shader 2 failed" << std::endl; // Ends up here.
>	else
>		std::cerr << "shader 2 worked" << std::endl;
>
>	getchar();
>
>	return 0;
>}
>

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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.