#include "define.h"

#include "fbo.h"





//-----------------------------------------------------------------------------

// Constructor

//-----------------------------------------------------------------------------

FBO::FBO()

{

    m_FrameBuffer=0;

    m_DepthRenderBuffer=0;

    m_ColorTextureID=0;

    m_DepthTextureID=0;

    m_width = 256;

    m_height = 256;



    //Create texture.

    glGenTextures(1, &m_ColorTextureID);

    glBindTexture(GL_TEXTURE_2D, m_ColorTextureID);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_width, m_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

    glBindTexture(GL_TEXTURE_2D, 0);



    glGenTextures(1, &m_DepthTextureID);

    glBindTexture(GL_TEXTURE_2D, m_DepthTextureID);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32, m_width, m_height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);

    glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE,   GL_LUMINANCE);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,   GL_LINEAR);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,   GL_LINEAR);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

    glBindTexture(GL_TEXTURE_2D, 0);





    //Make buffer

    glGenFramebuffers(1, &m_FrameBuffer);

    glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_FrameBuffer);



    glGenRenderbuffers(1, &m_DepthRenderBuffer);

    glBindRenderbuffer(GL_RENDERBUFFER_EXT, m_DepthRenderBuffer);

    glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, m_width, m_height);

    glBindRenderbuffer(GL_RENDERBUFFER_EXT, 0);



    glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, m_ColorTextureID, 0);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT,GL_DEPTH_ATTACHMENT_EXT,GL_RENDERBUFFER_EXT, m_DepthRenderBuffer);





    glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);



}





//-----------------------------------------------------------------------------

// Destructor

//-----------------------------------------------------------------------------

FBO::~FBO()

{

    glDeleteTextures(1, &m_ColorTextureID);

    glDeleteTextures(1, &m_DepthTextureID);

    glDeleteFramebuffers(1, &m_FrameBuffer);

    glDeleteRenderbuffers(1, &m_DepthRenderBuffer);

}





//-----------------------------------------------------------------------------

// Enable

//-----------------------------------------------------------------------------

void FBO::Enable(void)

{

    glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_FrameBuffer);



    glViewport(0,0,m_width,m_height);

    glPushMatrix();

}



//-----------------------------------------------------------------------------

// Disable

//-----------------------------------------------------------------------------

void FBO::Disable(void)

{

    glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);



    glViewport(0,0,SCREENX,SCREENY);

    glPopMatrix();

}







//-----------------------------------------------------------------------------

// SetSize

//-----------------------------------------------------------------------------

void FBO::SetSize( int width, int height )

{

    m_width = width;

    m_height = height;

    glBindRenderbuffer(GL_RENDERBUFFER_EXT, m_DepthRenderBuffer);

    glRenderbufferStorage(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT32, m_width, m_height);

    glBindRenderbuffer(GL_RENDERBUFFER_EXT, 0);



    //Create color texture.

    glBindTexture(GL_TEXTURE_2D, m_ColorTextureID);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_width, m_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);



    glBindTexture(GL_TEXTURE_2D, m_DepthTextureID);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32, m_width, m_height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);



    glBindTexture(GL_TEXTURE_2D, 0);

}





/*//-----------------------------------------------------------------------------

// GetSize

//-----------------------------------------------------------------------------

ivec2& FBO::GetSize(void)

{

    return m_size;

}*/





//-----------------------------------------------------------------------------

// GetColor

//-----------------------------------------------------------------------------

GLuint FBO::GetColor(void)

{

    return m_ColorTextureID;

}



//-----------------------------------------------------------------------------

// GetDepth

//-----------------------------------------------------------------------------

GLuint FBO::GetDepth(void)

{

    return m_DepthTextureID;

}