Attachment 105179 Details for Bug 82977 – main.cpp with looping (generating, copy, deleting) buffers

main.cpp with looping (generating, copy, deleting) buffers

main.cpp (text/plain), 3.84 KB, created by Frederik vom Hofe on 2014-08-23 22:32:43 UTC

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Creator: Frederik vom Hofe

Created: 2014-08-23 22:32:43 UTC

Size: 3.84 KB

patch

obsolete

>//This example uses/needs:
>//ARB_buffer_storage (core in 4.4)
>//glCopyBufferSubData (core in 3.1)
>
>#include <SDL.h>
>//#define GL_GLEXT_PROTOTYPES
>#include <SDL_opengl.h>
>#include <iostream>
>
>using namespace std;
>
>SDL_GLContext glRenderContext;
>SDL_Window *mainWindow;
>
>extern "C" typedef void (*PFNGLGENBUFFERSARBPROC)       (GLsizei n, GLuint  * buffers);
>extern "C" typedef void (*PFNGLDELETEBUFFERSPROC)       (GLsizei n, const  GLuint  * buffers);
>extern "C" typedef void (*PFNGLBINDBUFFERPROC)          (GLenum target, GLuint buffer);
>extern "C" typedef void (*PFNGLBUFFERSTORAGEPROC)       (GLenum target, GLsizeiptr size, const void * data, GLbitfield flags);
>extern "C" typedef void (*PFNGLCOPYBUFFERSUBDATAPROC)   (GLenum readTarget, GLenum writeTarget, GLintptr readOffset, GLintptr writeOffset, GLsizeiptr size);
>
>static PFNGLGENBUFFERSARBPROC           glGenBuffers;
>static PFNGLDELETEBUFFERSPROC           glDeleteBuffers;
>static PFNGLBINDBUFFERPROC              glBindBuffer;
>static PFNGLBUFFERSTORAGEPROC           glBufferStorage;
>static PFNGLCOPYBUFFERSUBDATAPROC       glCopyBufferSubData;
>
>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;
>    }
>
>    mainWindow = SDL_CreateWindow(
>        "An SDL2 window",                  //    window title
>        SDL_WINDOWPOS_UNDEFINED,           //    initial x position
>        SDL_WINDOWPOS_UNDEFINED,           //    initial y position
>        300,                               //    width, in pixels
>        300,                               //    height, in pixels
>        SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE//  | SDL_WINDOW_FULLSCREEN
>    );
>
>    if (!mainWindow)
>    {
>            cout << "Error in SDL_CreateWindow: " << SDL_GetError() << 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_FLAGS, GL_CONTEXT_FLAG_DEBUG_BIT);
>    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
>
>    glRenderContext = SDL_GL_CreateContext(mainWindow);
>    if (!glRenderContext)
>    {
>        cout << "Error in SDL_GL_CreateContext: " << SDL_GetError() << endl;
>        return -1;
>    }
>    SDL_GL_SetSwapInterval(1);
>
>    glGenBuffers        = reinterpret_cast<PFNGLGENBUFFERSARBPROC>(     SDL_GL_GetProcAddress("glGenBuffers"));
>    glDeleteBuffers     = reinterpret_cast<PFNGLDELETEBUFFERSPROC>(     SDL_GL_GetProcAddress("glDeleteBuffers"));
>    glBindBuffer        = reinterpret_cast<PFNGLBINDBUFFERPROC>(        SDL_GL_GetProcAddress("glBindBuffer"));
>    glBufferStorage     = reinterpret_cast<PFNGLBUFFERSTORAGEPROC>(     SDL_GL_GetProcAddress("glBufferStorage"));
>    glCopyBufferSubData = reinterpret_cast<PFNGLCOPYBUFFERSUBDATAPROC>( SDL_GL_GetProcAddress("glCopyBufferSubData"));
>   
>    int bufferSize = 64 * 1024 * 1024;
>    GLuint clientBufferId, serverBufferId;
>    for(int i = 0; i < 64; ++i)
>    {
>        glGenBuffers(1, &clientBufferId);
>        glBindBuffer(GL_ARRAY_BUFFER, clientBufferId);
>        glBufferStorage(GL_ARRAY_BUFFER, bufferSize, 0, 0);
>
>        glGenBuffers(1, &serverBufferId);
>        glBindBuffer(GL_ARRAY_BUFFER, serverBufferId);
>        glBufferStorage(GL_ARRAY_BUFFER, bufferSize, 0, 0);
>
>        glBindBuffer(GL_ARRAY_BUFFER, 0);
>        glBindBuffer(GL_COPY_READ_BUFFER,  clientBufferId);
>        glBindBuffer(GL_COPY_WRITE_BUFFER, serverBufferId);
>        glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0, bufferSize);
>        
>        glDeleteBuffers(1, &clientBufferId);
>        glDeleteBuffers(1, &serverBufferId);
>    }
>
>    SDL_GL_DeleteContext(glRenderContext);
>    SDL_DestroyWindow(mainWindow);
>    SDL_Quit();
>
>    return 0;
>}

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Attachments on bug 82977: 105127 | 105143 | 105144 | 105145 | 105177 | 105178 | 105179 | 105283

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