71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
#include <osg/TexEnvCombine>
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#include <osg/GLExtensions>
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using namespace osg;
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TexEnvCombine::TexEnvCombine():
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_combine_RGB(GL_MODULATE),
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_combine_Alpha(GL_MODULATE),
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_source0_RGB(GL_TEXTURE),
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_source1_RGB(GL_PREVIOUS_ARB),
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_source2_RGB(GL_CONSTANT_ARB),
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_source0_Alpha(GL_TEXTURE),
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_source1_Alpha(GL_PREVIOUS_ARB),
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_source2_Alpha(GL_CONSTANT_ARB),
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_operand0_RGB(GL_SRC_COLOR),
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_operand1_RGB(GL_SRC_COLOR),
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_operand2_RGB(GL_SRC_ALPHA),
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_operand0_Alpha(GL_SRC_ALPHA),
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_operand1_Alpha(GL_SRC_ALPHA),
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_operand2_Alpha(GL_SRC_ALPHA),
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_scale_RGB(1.0),
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_scale_Alpha(1.0),
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_constantColor(0.0f,0.0f,0.0f,0.0f)
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{
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}
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TexEnvCombine::~TexEnvCombine()
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{
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}
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void TexEnvCombine::apply(State&) const
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{
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static bool isTexEnvCombineSupported =
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isGLExtensionSupported("GL_ARB_texture_env_combine");
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if (isTexEnvCombineSupported)
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{
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glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
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glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, _combine_RGB);
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glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, _combine_Alpha);
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glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB,_source0_RGB );
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glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, _source1_RGB);
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glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB,_source2_RGB );
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glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, _source0_Alpha);
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glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, _source1_Alpha);
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glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, _source2_Alpha);
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glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, _operand0_RGB);
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glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, _operand1_RGB);
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glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, _operand2_RGB);
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glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, _operand0_Alpha);
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glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, _operand1_Alpha);
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glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, _operand2_Alpha);
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glTexEnvf( GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, _scale_RGB);
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glTexEnvf( GL_TEXTURE_ENV, GL_ALPHA_SCALE, _scale_Alpha);
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glTexEnvfv( GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, _constantColor.ptr());
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}
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else
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{
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// what is the best fallback when the tex env combine is not supported??
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// we will resort the settung the OpenGL default of GL_MODULATE.
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glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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}
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}
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