opengl es 2.0加速着色器效果

我尝试对我的对象（约10个对象）产生一些模糊效果。但是，当我应用效果并移动对象时，它非常缓慢。例如，当我翻译的对象，它不是同步的九个对象移动，但最后放缓的二分之一翻译太前...opengl es 2.0加速着色器效果

这里是我尝试应用着色器（着色器来自这个网站： https://github.com/Jam3/glsl-fast-gaussian-blur）：

gettimeofday(&t2, &tz); 
    deltatime = (float)(t2.tv_sec - t1.tv_sec + (t2.tv_usec - t1.tv_usec) * 1e-6); 
    t1 = t2; 

    glBindFramebuffer(GL_FRAMEBUFFER, fbo[0]); 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
    glClearColor(0.0f, 0.0f, 0.f, 1.f); 
    glUseProgram(shaderId); 

    glUniformMatrix4fv(glGetUniformLocation(shaderId, "projection"), 1, GL_FALSE, glm::value_ptr(projection)); 
    glUniformMatrix4fv(glGetUniformLocation(shaderId, "view"), 1, GL_FALSE, glm::value_ptr(view)); 

    //draw all objects 
    _transform->drawAll(shaderId); 

    glBindFramebuffer(GL_FRAMEBUFFER, 0); 

    GLfloat dir[] = {0.0f, 0.0f}; 
    GLfloat sizeFbo[] = {float(width), float(height)}; 

    for(int i = 0; i < valueSigma + 1; i++){ 
    float timeBlur = sin(deltatime) * 0.5f + 0.5f; 
    float resBlur = (valueSigma - i) * timeBlur ; 

    glBindFramebuffer(GL_FRAMEBUFFER, fbo[1]); 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
    glClearColor(0.0f, 0.0f, 0.f, 1.f); 

    glUseProgram(blurShaderId); 

    if(i == 0){ 
     glActiveTexture(GL_TEXTURE0); 

     glBindTexture(GL_TEXTURE_2D, tex[0]); 
    } 
    quadForm->draw(); 

    auto resolution = glGetUniformLocation(blurShaderId, "resolution"); 
    if(resolution < 0){ 
     std::cerr << "failed resolution" << std::endl; 
    } 

    auto direction = glGetUniformLocation(blurShaderId, "direction"); 
    if(direction < 0) 
     std::cerr << "failed direction" << std::endl; 

    if(i % 2 == 0){ 
     dir[0] = resBlur; 
     dir[1] = 0.0f; 
     glUniform2fv(direction, 2, dir); 
    } 
    else{ 
     dir[0] = 0.0f; 
     dir[1] = resBlur; 
    } 

    glUniform2fv(resolution, 2, sizeFbo);  

    glBindFramebuffer(GL_FRAMEBUFFER, 0); 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
    glClearColor(0.0f, 0.0f, 0.f, 1.f); 

    glUseProgram(blurShaderId); 
    glActiveTexture(GL_TEXTURE0); 
    glBindTexture(GL_TEXTURE_2D, tex[1]); 

    quadForm->draw(); 

    // dir[0] = dir[1] = 0.0f; 
    glUniform2fv(direction, 2, dir);  
    glUniform2fv(resolution, 2, sizeFbo); 
    }

来源

2017-08-28 Baouh

你有很多冗余的OpenGL调用; glUseProgram，glGetUniformLocation，glClearColor和glClear。摆脱他们，并告诉你的结果。

来源

2017-09-14 19:35:05 Andreas

opengl es 2.0加速着色器效果

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