Attachment 113504 Details for Bug 89152 – simple sdl2 example

simple sdl2 example

msBlitBugExample.cpp (text/plain), 2.74 KB, created by Frederik vom Hofe on 2015-02-15 12:48:04 UTC

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Creator: Frederik vom Hofe

Created: 2015-02-15 12:48:04 UTC

Size: 2.74 KB

patch

obsolete

>#include <SDL.h>
>#define GL_GLEXT_PROTOTYPES
>#include <SDL_opengl.h>
>
>#include <string>
>#include <iostream>
>
>using namespace std;
>
>SDL_GLContext glRenderContext;
>SDL_Window *mainWindow;
>
>string glErrorToString(GLenum e)
>{
>    switch (e) {
>        case GL_NO_ERROR: return "GL_NO_ERROR";
>        case GL_INVALID_ENUM: return "GL_INVALID_ENUM";
>        case GL_INVALID_VALUE: return "GL_INVALID_VALUE";
>        case GL_INVALID_OPERATION: return "GL_INVALID_OPERATION";
>        case GL_INVALID_FRAMEBUFFER_OPERATION: return "GL_INVALID_FRAMEBUFFER_OPERATION";
>        case GL_OUT_OF_MEMORY: return "GL_OUT_OF_MEMORY";
>        case GL_STACK_UNDERFLOW: return "GL_STACK_UNDERFLOW";
>        case GL_STACK_OVERFLOW: return "GL_STACK_OVERFLOW";
>        default: return "unknown error";
>    }
>}
>
>int main(int argc, char* argv[])
>{
>    if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0) {
>        cout << "Unable to initialize SDL: " << SDL_GetError() << endl;
>        return -1;
>    }
>
>    int resolutionX = 512;
>    int resolutionY = 512;
>
>    mainWindow = SDL_CreateWindow(
>        "An SDL2 window",
>        SDL_WINDOWPOS_UNDEFINED,
>        SDL_WINDOWPOS_UNDEFINED,
>        resolutionX,
>        resolutionY,
>        SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL
>    );
>
>    if(mainWindow==NULL){
>        std::cout << "Could not create window: " << SDL_GetError() << std::endl;
>        return -1;
>    }
>
>    //mesa/radeonsi only supports GL3.3 in Core
>    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
>    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
>    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
>    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
>    glRenderContext = SDL_GL_CreateContext(mainWindow);
>    
>    int x = 512;
>    int y = 512;
>    GLenum internalformat = GL_RGBA8;
>    int samples = 2;
>    GLuint textureId;
>    
>    glGenTextures(1, &textureId);
>    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, textureId);
>    glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, samples, internalformat, x, y, GL_TRUE);
>  
>    GLuint fboId;
>    glGenFramebuffers(1, &fboId);
>    glBindFramebuffer(GL_READ_FRAMEBUFFER, fboId);
>    glFramebufferTexture(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, textureId, 0);
>    
>    //when trying to blit any kind of multi sample fbo, this will always cause an GL_INVALID_OPERATION
>    //KHR_debug: "GL_INVALID_OPERATION in glBlitFramebufferEXT(bad src/dst multisample pixel formats)"
>    glBlitFramebuffer(0, 0, 512, 512, 0, 0, 512, 512, GL_COLOR_BUFFER_BIT, GL_NEAREST);
>    
>    GLenum e = glGetError();
>    if (e != GL_NO_ERROR) {
>        cout << "glGetError = " << glErrorToString(e) << endl;
>    }
>
>
>    SDL_GL_DeleteContext(glRenderContext);
>    SDL_DestroyWindow(mainWindow);
>    SDL_Quit();
>    return 0;
>}

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