mgcoglalphastate.cpp

3D Game Engine Design Source Code非常棒

// Magic Software, Inc.
// http://www.magic-software.com
// Copyright (c) 2000, All Rights Reserved
//
// Source code from Magic Software is supplied under the terms of a license
// agreement and may not be copied or disclosed except in accordance with the
// terms of that agreement.  The various license agreements may be found at
// the Magic Software web site.  This file is subject to the license
//
// RESTRICTED USE SOURCE CODE
// http://www.magic-software.com/License/restricted.pdf

#include "MgcOglRenderer.h"

GLenum MgcOglRenderer::ms_aeAlphaSrcBlend[MgcAlphaState::SBF_QUANTITY] =
{
    GL_ZERO,
    GL_ONE,
    GL_DST_COLOR,
    GL_ONE_MINUS_DST_COLOR,
    GL_SRC_ALPHA,
    GL_ONE_MINUS_SRC_ALPHA,
    GL_DST_ALPHA,
    GL_ONE_MINUS_DST_ALPHA,
    GL_SRC_ALPHA_SATURATE
};

GLenum MgcOglRenderer::ms_aeAlphaDstBlend[MgcAlphaState::DBF_QUANTITY] =
{
    GL_ZERO,
    GL_ONE,
    GL_SRC_COLOR,
    GL_ONE_MINUS_SRC_COLOR,
    GL_SRC_ALPHA,
    GL_ONE_MINUS_SRC_ALPHA,
    GL_DST_ALPHA,
    GL_ONE_MINUS_DST_ALPHA
};

GLenum MgcOglRenderer::ms_aeAlphaTest[MgcAlphaState::TF_QUANTITY] =
{
    GL_NEVER,
    GL_LESS,
    GL_EQUAL,
    GL_LEQUAL,
    GL_GREATER,
    GL_NOTEQUAL,
    GL_GEQUAL,
    GL_ALWAYS
};

//----------------------------------------------------------------------------
void MgcOglRenderer::SetAlphaState (MgcAlphaState* pkState)
{
    if ( pkState->BlendEnabled() )
    {
        glEnable(GL_BLEND);
        glBlendFunc(ms_aeAlphaSrcBlend[pkState->SrcBlend()],
            ms_aeAlphaDstBlend[pkState->DstBlend()]);
    }
    else
    {
        glDisable(GL_BLEND);
    }

    if ( pkState->TestEnabled() )
    {
        glEnable(GL_ALPHA_TEST);
        glAlphaFunc(pkState->Test(),pkState->Reference());
    }
    else
    {
        glDisable(GL_ALPHA_TEST);
    }
}
//----------------------------------------------------------------------------