T2RenderContext_GL.h

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#pragma once
 
#ifdef TRENDERINTERFACE_GL
 
#  include "T2Viewport_GL.h"
#  include "T2GLTexture_GL.h"
#  include "T2Shader_GL.h"
#  include "Math/TMatrix44.h"
#  include "Math/TSphere.h"
 
TOSHI_NAMESPACE_START
 
typedef TUINT32 FRUSTUMPLANE;
enum FRUSTUMPLANE_ : FRUSTUMPLANE
{
    FRUSTUMPLANE_LEFT,
    FRUSTUMPLANE_RIGHT,
    FRUSTUMPLANE_BOTTOM,
    FRUSTUMPLANE_TOP,
    FRUSTUMPLANE_NEAR,
    FRUSTUMPLANE_FAR,
    FRUSTUMPLANE_NUMOF
};
 
//-----------------------------------------------------------------------------
// Note: This is a custom class.
//-----------------------------------------------------------------------------
class T2RenderContext
{
public:
    using Frustum = TPlane[ FRUSTUMPLANE_NUMOF ];
 
    struct Projection
    {
        TVector2 vecCenter;
        TVector2 vecProj;
        TFLOAT   fNearClip;
        TFLOAT   fFarClip;
    };
 
public:
    T2RenderContext();
    ~T2RenderContext();
 
    TMatrix44&       GetProjectionMatrix() { return m_matProjection; }
    const TMatrix44& GetProjectionMatrix() const { return m_matProjection; }
 
    TBOOL SetShaderProgram( const T2Shader& a_rcShaderProgram );
 
    GLuint GetTexture2D( TINT a_iTextureIndex );
    void   SetTexture2D( TINT a_iTextureIndex, GLuint a_uiTexture );
    void   SetTexture2D( TINT a_iTextureIndex, const T2GLTexture& a_rcTexture );
    void   ResetTexture2D( TINT a_iTextureIndex );
 
    void EnableDepthTest( TBOOL a_bEnable );
    void EnableBlend( TBOOL a_bEnable );
 
public:
    static void ComputePerspectiveProjection( TMatrix44& a_rOutProjection, const T2Viewport& a_rViewportParams, const Projection& a_rProjParams );
    static void ComputeOrthographicProjection( TMatrix44& a_rOutProjection, const T2Viewport& a_rViewportParams, const Projection& a_rProjParams );
 
    static void ComputePerspectiveFrustum( Frustum& a_rcFrustum, const T2Viewport& a_rViewportParams, const Projection& a_rProjParams );
    static void ComputeOrthographicFrustum( Frustum& a_rcFrustum, const T2Viewport& a_rViewportParams, const Projection& a_rProjParams );
 
    static TBOOL CullSphereToFrustumSimple( const TSphere& a_rSphere, const TPlane* a_pPlanes, TINT a_iNumPlanes );
    static TINT  CullSphereToFrustum( const TSphere& a_rSphere, const TPlane* a_pPlanes, TINT a_iClipFlags, TINT a_iClipFlagsMask );
 
private:
    TMatrix44 m_matProjection;
    GLuint    m_uiCurrentShaderProgram = -1;
    TINT      m_iCurrentTextureUnit    = 0;
    GLuint    m_aCurrentTextures[ 8 ];
 
    TBOOL m_bDepthTest : 1;
    TBOOL m_bBlend : 1;
};
 
TOSHI_NAMESPACE_END
 
#endif // TRENDERINTERFACE_GL