Attachment 140709 Details for Bug 107290 – Demonstration for hang

Demonstration for hang

FramebufferHangTest.cpp (text/x-csrc), 2.81 KB, created by Jason Wyatt on 2018-07-19 12:13:34 UTC

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Filename:

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Creator: Jason Wyatt

Created: 2018-07-19 12:13:34 UTC

Size: 2.81 KB

patch

obsolete

>#include <chrono>
>#include <iostream>
>
>#define GL_GLEXT_PROTOTYPES 1
>#include <GL/gl.h>
>
>#include <SDL2/SDL.h>
>
>void checkGLError()
>{
>	GLenum error = glGetError();
>	while (error)
>	{
>		const char* errStr;
>		switch (error)
>		{
>			case GL_INVALID_ENUM:
>				errStr = "GL_INVALID_ENUM";
>				break;
>			case GL_INVALID_VALUE:
>				errStr = "GL_INVALID_VALUE";
>				break;
>			case GL_INVALID_OPERATION:
>				errStr = "GL_INVALID_OPERATION";
>				break;
>			default:
>				errStr = "Unknown error";
>				break;
>		}
>		std::cout << errStr << std::endl;
>		throw;
>	}
>}
>
>int main()
>{
>	// Initilaise SDL
>	SDL_Init(SDL_INIT_VIDEO);
>	
>	// Create a fullscreen window on the first display
>	SDL_Rect bounds;
>	SDL_GetDisplayBounds(0, &bounds);
>	SDL_Window* window = SDL_CreateWindow("TestApplication", bounds.x, bounds.y, bounds.w, bounds.h, SDL_WINDOW_OPENGL | SDL_WINDOW_FULLSCREEN_DESKTOP );
>	if (!window)
>		std::cout << SDL_GetError() << std::endl;
>	
>	// Create a double buffered context
>	SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION, 4 );
>	SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION, 5 );
>	SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
>	SDL_GL_SetAttribute( SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE );
>
>	SDL_GLContext context = SDL_GL_CreateContext(window);
>	if (!context)
>		std::cout << SDL_GetError() << std::endl;
>		
>	GLuint texId;
>	glGenTextures(1, &texId);
>	checkGLError();
>	glBindTexture(GL_TEXTURE_2D, texId);
>	checkGLError();
>	glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, bounds.w, bounds.h);
>	checkGLError();
>	
>	GLuint framebufferId;
>	glGenFramebuffers(1, &framebufferId);
>	checkGLError();
>	glBindFramebuffer(GL_FRAMEBUFFER, framebufferId);
>	checkGLError();
>	glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texId, 0);
>	checkGLError();
>	
>	bool exit = false;
>	while (!exit)
>	{
>		SDL_Event event;
>		while (SDL_PollEvent(&event))
>		{
>			switch (event.type)
>			{
>			case SDL_QUIT:
>				exit = true;
>				break;
>			}
>		}
>		
>		auto startTime = std::chrono::steady_clock::now();
>		
>		// Make sure there's something in the front buffer
>		glBindFramebuffer(GL_FRAMEBUFFER, 0);
>		checkGLError();
>		glDrawBuffer(GL_BACK);
>		checkGLError();
>		glClearColor(0,0,0,0);
>		checkGLError();
>		SDL_GL_SwapWindow(window);
>		checkGLError();
>		
>		// Attempt to copy the front buffer to the back buffer
>		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, framebufferId);
>		checkGLError();
>		glDrawBuffer(GL_COLOR_ATTACHMENT0);
>		checkGLError();
>		glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
>		checkGLError();
>		glReadBuffer(GL_FRONT);
>		checkGLError();
>		glBlitFramebuffer(0, 0, bounds.w, bounds.h, 0, 0, bounds.w, bounds.h, GL_COLOR_BUFFER_BIT, GL_NEAREST);
>		checkGLError();
>		
>		auto duration = std::chrono::steady_clock::now() - startTime;
>		std::cout << "Duration was " << std::chrono::duration_cast<std::chrono::milliseconds>(duration).count() << "ms" << std::endl;
>	}
>	
>	return 0;
>}

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