FGFS-4.1/OpenSceneGraph
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Added support for the tex_env_add and tex_env_crossbar extensions.

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This commit is contained in:
Robert Osfield 2002-08-20 14:15:49 +00:00
parent 7234f7274c
commit 88f387810d
5 changed files with 76 additions and 15 deletions
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3
include/osg/TexEnv
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@ -47,7 +47,8 @@ class SG_EXPORT TexEnv : public StateAttribute
DECAL = GL_DECAL,
MODULATE = GL_MODULATE,
BLEND = GL_BLEND,
REPLACE = GL_REPLACE
REPLACE = GL_REPLACE,
ADD = GL_ADD
};
void setMode( const Mode mode ) { _mode = mode; }

61
include/osg/TexEnvCombine
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@ -37,6 +37,10 @@
#define GL_PREVIOUS_ARB 0x8578
#endif
#ifndef GL_TEXTURE0
#define GL_TEXTURE0 0x84C0
#endif
namespace osg {
/** TexEnvCombine - encapsulates the OpenGL glTexEnvCombine (texture environment) state.*/
@ -49,6 +53,7 @@ class SG_EXPORT TexEnvCombine : public StateAttribute
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
TexEnvCombine(const TexEnvCombine& texenv,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
StateAttribute(texenv,copyop),
_needsTexEnvCrossbar(texenv._needsTexEnvCrossbar),
_combine_RGB(texenv._combine_RGB),
_combine_Alpha(texenv._combine_Alpha),
_source0_RGB(texenv._source0_RGB),
@ -81,6 +86,7 @@ class SG_EXPORT TexEnvCombine : public StateAttribute
COMPARE_StateAttribute_Types(TexEnvCombine,sa)
// compare each paramter in turn against the rhs.
COMPARE_StateAttribute_Parameter(_needsTexEnvCrossbar)
COMPARE_StateAttribute_Parameter(_combine_RGB)
COMPARE_StateAttribute_Parameter(_combine_Alpha)
COMPARE_StateAttribute_Parameter(_source0_RGB)
@ -121,19 +127,27 @@ class SG_EXPORT TexEnvCombine : public StateAttribute
enum SourceParam
{
TEXTURE = GL_TEXTURE,
CONSTANT = GL_CONSTANT_ARB,
PRIMARY_COLOR = GL_PRIMARY_COLOR_ARB,
PREVIOUS = GL_PREVIOUS_ARB
PREVIOUS = GL_PREVIOUS_ARB,
TEXTURE = GL_TEXTURE,
TEXTURE_0 = GL_TEXTURE0,
TEXTURE_1 = GL_TEXTURE0+1,
TEXTURE_2 = GL_TEXTURE0+2,
TEXTURE_3 = GL_TEXTURE0+3,
TEXTURE_4 = GL_TEXTURE0+4,
TEXTURE_5 = GL_TEXTURE0+5,
TEXTURE_6 = GL_TEXTURE0+6,
TEXTURE_7 = GL_TEXTURE0+7
};
void setSource0_RGB(GLint sp) { _source0_RGB = sp; }
void setSource1_RGB(GLint sp) { _source1_RGB = sp; }
void setSource2_RGB(GLint sp) { _source2_RGB = sp; }
void setSource0_RGB(GLint sp) { _source0_RGB = sp; computeNeedoForTexEnvCombiners(); }
void setSource1_RGB(GLint sp) { _source1_RGB = sp; computeNeedoForTexEnvCombiners(); }
void setSource2_RGB(GLint sp) { _source2_RGB = sp; computeNeedoForTexEnvCombiners(); }
void setSource0_Alpha(GLint sp) { _source0_Alpha = sp; }
void setSource1_Alpha(GLint sp) { _source1_Alpha = sp; }
void setSource2_Alpha(GLint sp) { _source2_Alpha = sp; }
void setSource0_Alpha(GLint sp) { _source0_Alpha = sp; computeNeedoForTexEnvCombiners(); }
void setSource1_Alpha(GLint sp) { _source1_Alpha = sp; computeNeedoForTexEnvCombiners(); }
void setSource2_Alpha(GLint sp) { _source2_Alpha = sp; computeNeedoForTexEnvCombiners(); }
GLint getSource0_RGB() const { return _source0_RGB; }
GLint getSource1_RGB() const { return _source1_RGB; }
@ -184,11 +198,38 @@ class SG_EXPORT TexEnvCombine : public StateAttribute
virtual ~TexEnvCombine();
inline bool needsTexEnvCombiner(GLint value) const
{
switch(value)
{
case(CONSTANT):
case(PRIMARY_COLOR):
case(PREVIOUS):
case(TEXTURE):
return false;
}
return true;
}
void computeNeedoForTexEnvCombiners()
{
_needsTexEnvCrossbar = (needsTexEnvCombiner(_source0_RGB) ||
needsTexEnvCombiner(_source1_RGB) ||
needsTexEnvCombiner(_source2_RGB) ||
needsTexEnvCombiner(_source0_Alpha) ||
needsTexEnvCombiner(_source1_Alpha) ||
needsTexEnvCombiner(_source2_Alpha));
}
bool _needsTexEnvCrossbar;
GLint _combine_RGB;
GLint _combine_Alpha;
GLint _source0_RGB;
GLint _source1_RGB;
GLint _source2_RGB;

18
src/osg/TexEnv.cpp
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@ -1,4 +1,5 @@
#include <osg/TexEnv>
#include <osg/GLExtensions>
using namespace osg;
@ -15,9 +16,20 @@ TexEnv::~TexEnv()
void TexEnv::apply(State&) const
{
glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, _mode);
if (_mode==TexEnv::BLEND)
if (_mode==ADD)
{
glTexEnvfv( GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, _color.ptr());
static bool isTexEnvAddSupported = isGLExtensionSupported("GL_ARB_texture_env_add");
if (isTexEnvAddSupported)
glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, ADD);
else // fallback on OpenGL default.
glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, MODULATE);
}
else
{
glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, _mode);
if (_mode==TexEnv::BLEND)
{
glTexEnvfv( GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, _color.ptr());
}
}
}

6
src/osg/TexEnvCombine.cpp
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@ -4,6 +4,7 @@
using namespace osg;
TexEnvCombine::TexEnvCombine():
_needsTexEnvCrossbar(false),
_combine_RGB(GL_MODULATE),
_combine_Alpha(GL_MODULATE),
_source0_RGB(GL_TEXTURE),
@ -33,7 +34,10 @@ void TexEnvCombine::apply(State&) const
static bool isTexEnvCombineSupported =
isGLExtensionSupported("GL_ARB_texture_env_combine");
if (isTexEnvCombineSupported)
static bool isTexEnvCrossbarSupported =
isGLExtensionSupported("GL_ARB_texture_env_crossbar");
if (isTexEnvCrossbarSupported || (!_needsTexEnvCrossbar && isTexEnvCombineSupported))
{
glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);

3
src/osgPlugins/osg/TexEnv.cpp
View File

@ -66,6 +66,7 @@ bool TexEnv_writeLocalData(const Object& obj, Output& fw)
case(TexEnv::DECAL):
case(TexEnv::MODULATE):
case(TexEnv::REPLACE):
case(TexEnv::ADD):
break;
case(TexEnv::BLEND):
default:
@ -82,6 +83,7 @@ bool TexEnv_matchModeStr(const char* str,TexEnv::Mode& mode)
else if (strcmp(str,"MODULATE")==0) mode = TexEnv::MODULATE;
else if (strcmp(str,"BLEND")==0) mode = TexEnv::BLEND;
else if (strcmp(str,"REPLACE")==0) mode = TexEnv::REPLACE;
else if (strcmp(str,"ADD")==0) mode = TexEnv::ADD;
else return false;
return true;
}
@ -95,6 +97,7 @@ const char* TexEnv_getModeStr(TexEnv::Mode mode)
case(TexEnv::MODULATE): return "MODULATE";
case(TexEnv::BLEND): return "BLEND";
case(TexEnv::REPLACE): return "REPLACE";
case(TexEnv::ADD): return "ADD";
}
return "";
}