78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
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/**
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* =========================================================================
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* File : ShadowMap.h
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* Project : Pyrogenesis
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* Description : Shadow mapping related texture and matrix management
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*
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* @author Nicolai Hähnle <nicolai@wildfiregames.com>
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* =========================================================================
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*/
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#ifndef SHADOWMAP_H
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#define SHADOWMAP_H
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#include "ogl.h"
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class CBound;
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class CMatrix3D;
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struct ShadowMapInternals;
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/**
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* Class ShadowMap: Maintain the shadow map texture and perform necessary OpenGL setup,
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* including matrix calculations.
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*
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* The class will automatically generate a texture the first time the shadow map is rendered into.
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* The texture will not be resized afterwards.
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*
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* @todo use depth textures for self-shadowing
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*/
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class ShadowMap
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{
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public:
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ShadowMap();
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~ShadowMap();
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/**
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* SetupFrame: Setup shadow map texture and matrices for this frame.
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*
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* @param visibleBounds bound around objects that are visible on the screen
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*/
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void SetupFrame(const CBound& visibleBounds);
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/**
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* BeginRender: Set OpenGL state for rendering into the shadow map texture.
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*
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* @todo this depends in non-obvious ways on the behaviour of the call-site
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*/
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void BeginRender();
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/**
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* EndRender: Finish rendering into the shadow map.
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*
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* @todo this depends in non-obvious ways on the behaviour of the call-site
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*/
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void EndRender();
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/**
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* GetTexture: Retrieve the OpenGL texture object name that contains the shadow map.
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*
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* @return the texture name of the shadow map texture
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*/
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GLuint GetTexture();
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/**
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* GetTextureMatrix: Retrieve the world-space to shadow map texture coordinates
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* transformation matrix.
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*
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* @return the matrix that transforms world-space coordinates into homogenous
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* shadow map texture coordinates
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*/
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const CMatrix3D& GetTextureMatrix();
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private:
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ShadowMapInternals* m;
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};
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#endif // SHADOWMAP_H
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