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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// cglmfbo.h
// GLMgr FBO's (render targets)
//
//===============================================================================
#ifndef CGLMFBO_H
#define CGLMFBO_H
#pragma once
#include "togl/rendermechanism.h"
// good FBO references / recaps
// http://www.songho.ca/opengl/gl_fbo.html
// http://www.gamedev.net/reference/articles/article2331.asp
// ext links
// http://www.opengl.org/registry/specs/EXT/framebuffer_object.txt
// http://www.opengl.org/registry/specs/EXT/framebuffer_multisample.txt
//===============================================================================
// tokens not in the SDK headers
#ifndef GL_DEPTH_STENCIL_ATTACHMENT_EXT
#define GL_DEPTH_STENCIL_ATTACHMENT_EXT 0x84F9
#endif
//===============================================================================
// forward declarations
class GLMContext;
// implicitly 16 maximum color attachments possible
enum EGLMFBOAttachment {
kAttColor0, kAttColor1, kAttColor2, kAttColor3,
kAttColor4, kAttColor5, kAttColor6, kAttColor7,
kAttColor8, kAttColor9, kAttColor10, kAttColor11,
kAttColor12, kAttColor13, kAttColor14, kAttColor15,
kAttDepth, kAttStencil, kAttDepthStencil,
kAttCount
};
struct GLMFBOTexAttachParams
{
CGLMTex *m_tex;
int m_face; // keep zero if not cube map
int m_mip; // keep zero if notmip mapped
int m_zslice; // keep zero if not a 3D tex
};
class CGLMFBO
{
public:
protected:
friend class GLMContext; // only GLMContext can make CGLMFBO objects
friend class GLMTester;
friend class CGLMTex;
friend class IDirect3D9;
friend class IDirect3DDevice9;
CGLMFBO( GLMContext *ctx );
~CGLMFBO( );
void TexAttach( GLMFBOTexAttachParams *params, EGLMFBOAttachment attachIndex, GLenum fboBindPoint = GL_FRAMEBUFFER_EXT );
void TexDetach( EGLMFBOAttachment attachIndex, GLenum fboBindPoint = GL_FRAMEBUFFER_EXT );
// you can also pass GL_READ_FRAMEBUFFER_EXT or GL_DRAW_FRAMEBUFFER_EXT to selectively bind the receiving FBO to one or the other.
void TexScrub( CGLMTex *tex );
// search and destroy any attachment for the named texture
bool IsReady( void ); // aka FBO completeness check - ready to draw
GLMContext *m_ctx; // link back to parent context
GLuint m_name; // name of this FBO in the context
GLMFBOTexAttachParams m_attach[ kAttCount ]; // indexed by EGLMFBOAttachment
int m_sizeX,m_sizeY;
};
#endif
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