Attachment 45537 Details for Bug 36173 – simple app the exibhits the problem

simple app the exibhits the problem

fbo_format_field.cpp (text/x-c++src), 3.41 KB, created by Pierre-Eric Pelloux-Prayer on 2011-04-12 09:01:08 UTC

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Creator: Pierre-Eric Pelloux-Prayer

Created: 2011-04-12 09:01:08 UTC

Size: 3.41 KB

patch

obsolete

>/*
>Compile with :
>g++ fbo_format_field.cpp -g -lglfw -lGL -lGLEW -lGLU -o fbo_format_field
>
>example result without patch and ST_DEBUG=fallback :
>st_readpixels: fallback processing
>    glReadPixel (FrameBuffer) : 0.015165 sec
>    glReadPixel (FBO)         : 0.044551 sec
>
>    st_readpixels: fallback processing
>    glReadPixel (FrameBuffer) : 0.026914 sec
>    glReadPixel (FBO)         : 0.033629 sec
>
>example result with patch :
>    glReadPixel (FrameBuffer) : 0.014822 sec
>    glReadPixel (FBO)         : 0.024562 sec
>
>    glReadPixel (FrameBuffer) : 0.012724 sec
>    glReadPixel (FBO)         : 0.012266 sec
>
>*/
>
>
>#include <GL/glew.h>
>#include <GL/glfw.h>
>#include <GL/gl.h>
>#include <cassert>
>#include <iostream>
>#include <cmath>
>#include <cstdlib>
>
>#define CHECK_GL_ERROR {GLenum err = glGetError(); if (err != GL_NO_ERROR) { std::cout << "Error : " << gluErrorString(err) << std::endl; assert(false); }}
>
>void render() {
>    // nothing
>}
>
>int main(int argc, char** argv) {
>    glfwInit();
>
>    int w = 1024, h = 768;
>    glfwOpenWindow(w, h, 8, 8, 8, 8, 8, 1, GLFW_WINDOW);
>
>    glewInit();
>
>    GLuint vbos[2];
>    unsigned char* tmp;
>    unsigned int* indices;
>
>    int a = 2;
>
>    // setup camera
>	glMatrixMode(GL_PROJECTION);
>	glLoadIdentity();
>	gluPerspective(70, w / (float)h, 0.1, 200);
>	glMatrixMode(GL_MODELVIEW);
>	glLoadIdentity();
>	gluLookAt(
>			0.5, 0.5, 0.8,
>			0.5, 0.5, 0,
>			0, 1, 0);
>    glClearColor(1,1,1,1);
>    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
>
>    // setup render buffer
>	GLuint fbo;
>	glGenFramebuffersEXT(1, &fbo);
>	GLuint renderBuffers[2];
>	glGenRenderbuffersEXT(2, renderBuffers);
>	
>	glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
>	// depth render buffer
>	glBindRenderbufferEXT(GL_RENDERBUFFER, renderBuffers[0]);
>	glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, w, h);
>	glBindRenderbufferEXT(GL_RENDERBUFFER, 0);
>	// color render buffer
>	glBindRenderbufferEXT(GL_RENDERBUFFER, renderBuffers[1]);
>	glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_RGBA, w, h);
>	glBindRenderbufferEXT(GL_RENDERBUFFER, 0);
>	
>	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, renderBuffers[0]);
>	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderBuffers[1]);
>	
>	assert (glCheckFramebufferStatusEXT(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
>	glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
>
>    unsigned char* bufferB[2];
>    for(int i=0; i<2; ++i) {
>        bufferB[i] = new unsigned char[w * h * 4];
>    }
>
>    while(true) {
>        CHECK_GL_ERROR
>
>        glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
>        glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
>        render();
>        double t1 = glfwGetTime();
>        glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, bufferB[0]);
>        double t2 = glfwGetTime();
>
>        glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
>        glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
>        render();
>        double t3 = glfwGetTime();
>        glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, bufferB[1]);
>        double t4 = glfwGetTime();
>
>        glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
>        glfwSwapBuffers();
>
>        if (glfwGetKey( GLFW_KEY_ESC ) || !glfwGetWindowParam( GLFW_OPENED )) break;
>
>        std::cout << "glReadPixel (FrameBuffer) : " << (t2 - t1) << " sec" << std::endl;
>        std::cout << "glReadPixel (FBO)         : " << (t4 - t3) << " sec" << std::endl;
>        std::cout << std::endl;
>    }
>
>    return 0;
>}

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Attachments on bug 36173: 45537 | 45538

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