高效的sprite渲染opengl es 2.0

我正在开发一个ipad应用程序,它可以在每一帧上渲染数百个精灵(2d图像)。我使用修改后的绘图方法取自sdk的opengl模板,但问题是,我只有3fps,我甚至没有渲染我需要的一切。

我尝试了一些简单的优化方法,比如使用纹理图集,最小化状态变化的数量,高级剪辑,甚至渲染按常用属性排序的精灵,比如使用的颜色或纹理,但似乎没有多大帮助。我不能使用pvr压缩,因为我的图像有很好的边缘和alpha通道,压缩时看起来很糟糕(我只在少数背景图像上使用它)。

下面是我的渲染函数:

- (void)RenderTexture:(GLTexture*)tex InRect:(CGRect)dest WithUV:(CGRect)uv Color:(LSColor*)color Effect:(SpriteEffect)effect Rotation:(float)rot AroundPoint:(CGPoint)rotCenter {
 if(tex.ID != mLastBoundTexture) {
   [tex bind];
   mLastBoundTexture = tex.ID;
 }

 mSquareVertices[2] = mSquareVertices[6] = dest.size.width;
 mSquareVertices[5] = mSquareVertices[7] = dest.size.height;

 mSquareUVs[0] = mSquareUVs[4] = uv.origin.x;
 mSquareUVs[1] = mSquareUVs[3] = uv.origin.y;
 mSquareUVs[2] = mSquareUVs[6] = uv.origin.x + uv.size.width;
 mSquareUVs[5] = mSquareUVs[7] = uv.origin.y + uv.size.height;

 mSquareColors[0] = mSquareColors[4] = mSquareColors[8] = mSquareColors[12] = color.red;
 mSquareColors[1] = mSquareColors[5] = mSquareColors[9] = mSquareColors[13] = color.green;
 mSquareColors[2] = mSquareColors[6] = mSquareColors[10] = mSquareColors[14] = color.blue;
 mSquareColors[3] = mSquareColors[7] = mSquareColors[11] = mSquareColors[15] = color.alpha;

 mat4f_LoadTranslation2f(rotCenter.x, rotCenter.y, mModelViewMatrix);

 mat4f_LoadTranslation2f(dest.origin.x, dest.origin.y, mModelViewMatrix);
 mat4f_MultiplyMat4f(mProjectionMatrix, mModelViewMatrix, mModelViewProjMatrix);

 if(mLastUsedShader != effect) {
   int program;
   if(effect == SENormal) {
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     program = mShaderNormal;
   }
   else if(effect == SEMultiply) {
     glBlendFunc(GL_DST_COLOR, GL_ZERO);
     program = mShaderMultiply;
   }  
 else {
   NSLog(@"Implement SpriteEffect %i", effect);
 }

 glUseProgram(program);
 mLastUsedShader = effect;
 } 
 glUniformMatrix4fv(uniforms[UNIFORM_MODELVIEW_PROJECTION_MATRIX], 1, GL_FALSE, mModelViewProjMatrix);

 // Update attribute values
 glVertexAttribPointer(ATTRIB_VERTEX, 2, GL_FLOAT, 0, 0, mSquareVertices);
 glVertexAttribPointer(ATTRIB_UV, 2, GL_FLOAT, 0, 0, mSquareUVs);
 glVertexAttribPointer(ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, 1, 0, mSquareColors);

 glUniform4fv(uniforms[UNIFORM_POSTPROCES_PARAMS], 4, mPostprocessParams);

 // Draw
 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 }

你看到我可以提高帧率的其他地方了吗?我真的需要至少30帧

编辑:原来我有太复杂的片段着色器。我觉得自己很愚蠢,因为我没有禁用它来测试它。看来我得跟我的去饱和功能说再见了。使用默认的片段着色器,我可以轻松地获得超过60帧/秒。