rendertargets.h

rendertargets.h

//
//  RenderTargets.h
//  
//
//  Created by Chris Pugh on 2/2/16.
//
//

#ifndef RenderTargets_h
#define RenderTargets_h

struct RenderTarget
{
    gl::Framebuffer fbo;
    
    unsigned int frameWidth; ///< one half the allocated render target width, since we are using side by side stereo
    unsigned int frameHeight;
    unsigned int multisamples;
    RenderTarget(unsigned int width, unsigned int height, unsigned int samples) :
    frameWidth(width), frameHeight(height), multisamples(samples)
    {
        
    }
};


struct BasicRenderTarget : public RenderTarget
{
    // *** experimental path.  copying from side by side rendering to output textures*** /
    gl::Renderbuffer depthTex;

    void prime(GLuint tex)
    {
        fbo.Bind(GL_FRAMEBUFFER);


#if GL_ALT_API_NAME == GL_ALT_GLES_API
        if (multisamples > 1)
        {
            glFramebufferTexture2DMultisampleEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                                                 tex, 0, multisamples);
        }
        else
#endif
        {
            std::clog<<"fbo texture"<<std::endl;

            fbo.Texture(GL_COLOR_ATTACHMENT0, tex, 0);
           /// glFramebufferTexture2DMultisampleEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,tex, 0, multisamples);
            ///fbo.Texture2D(GL_COLOR_ATTACHMENT0, tex, 0);
        }

        /*try
        {
            checkFramebuffer();
        }
        catch (const std::runtime_error& ex)
        {
            std::clog<<ex.what()<<std::endl;

        }*/

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    }


    BasicRenderTarget(int multisamples, unsigned int width, unsigned int height) :
            RenderTarget(width, height, multisamples)
    {

        const GLenum depthFormat = GL_DEPTH_COMPONENT16;

        ///\todo acknowledge settings for eg, samples, depth format
#if GL_ALT_API_NAME == GL_ALT_GLES_API
        if (multisamples > 1)
        {

            std::clog<<"Side by side with multisamples : "<<multisamples<<std::endl;
            depthTex.Bind();
            glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER, multisamples, depthFormat, width, height);

            ///\todo this fails but renderbufferstoragemultisamplext directly does not
            ///depthTex.StorageMultisample(multisamples, depthFormat, width, height);
        }
        else
#endif
        {
            std::clog<<"Side by side without multisampling"<<std::endl;
            depthTex.Storage(depthFormat, width,height);
        }

        fbo.Renderbuffer(GL_DEPTH_ATTACHMENT, depthTex); ///\todo was depthTex

        static const GLenum draw_buffers[] = {GL_COLOR_ATTACHMENT0};
        /**glDrawBuffers(1, draw_buffers);**/

        ///\todo checkFramebuffer();


        glViewport(0, 0, frameWidth, frameHeight);
    }
};

#endif /* RenderTargets_h */