FGFS-4.1/OpenSceneGraph
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Added blend shadow fragment shader

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This commit is contained in:
Robert Osfield
2005-08-06 04:33:56 +00:00
parent e534e4d1ed
commit 81dab87154
1 changed files with 38 additions and 2 deletions
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40
examples/osgdepthshadow/osgdepthshadow.cpp
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@@ -15,6 +15,8 @@
#include <osg/PolygonOffset>
#include <osg/CullFace>
#include <osg/Material>
#include <osg/TexEnvCombine>
#include <osg/TexEnv>
#include <osgUtil/TransformCallback>
@@ -226,6 +228,10 @@ class UpdateCameraAndTexGenCallback : public osg::NodeCallback
float zNearRatio = 0.001f;
if (znear<zfar*zNearRatio) znear = zfar*zNearRatio;
#if 0
// hack to illustrate the precision problems of excessive gap between near far range.
znear = 0.00001*zfar;
#endif
float top = (bs.radius()/centerDistance)*znear;
float right = top;
@@ -255,6 +261,18 @@ class UpdateCameraAndTexGenCallback : public osg::NodeCallback
};
//////////////////////////////////////////////////////////////////
// fragment shader
//
char fragmentShaderSource[] =
"uniform sampler2DShadow baseTexture; \n"
"uniform vec2 ambientBias; \n"
"\n"
"void main(void) \n"
"{ \n"
" gl_FragColor = gl_Color*(ambientBias.x + shadow2DProj( baseTexture, gl_TexCoord[0] ) * ambientBias.y); \n"
"}\n";
osg::Group* createShadowedScene(osg::Node* shadowed,osg::MatrixTransform* light_transform, unsigned int unit)
{
@@ -289,9 +307,13 @@ osg::Group* createShadowedScene(osg::Node* shadowed,osg::MatrixTransform* light_
_local_stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
float factor = 0.0f;
float units = 0.0f;
ref_ptr<PolygonOffset> polygon_offset = new PolygonOffset;
polygon_offset->setFactor(1.1f);
polygon_offset->setUnits(4.0f);
polygon_offset->setFactor(factor);
polygon_offset->setUnits(units);
_local_stateset->setAttribute(polygon_offset.get(), StateAttribute::ON | StateAttribute::OVERRIDE);
_local_stateset->setMode(GL_POLYGON_OFFSET_FILL, StateAttribute::ON | StateAttribute::OVERRIDE);
@@ -336,7 +358,21 @@ osg::Group* createShadowedScene(osg::Node* shadowed,osg::MatrixTransform* light_
stateset->setTextureMode(unit,GL_TEXTURE_GEN_S,osg::StateAttribute::ON);
stateset->setTextureMode(unit,GL_TEXTURE_GEN_T,osg::StateAttribute::ON);
stateset->setTextureMode(unit,GL_TEXTURE_GEN_R,osg::StateAttribute::ON);
stateset->setTextureMode(unit,GL_TEXTURE_GEN_Q,osg::StateAttribute::ON);
osg::Program* program = new osg::Program;
stateset->setAttribute(program);
osg::Shader* fragment_shader = new osg::Shader(osg::Shader::FRAGMENT, fragmentShaderSource);
program->addShader(fragment_shader);
osg::Uniform* baseTextureSampler = new osg::Uniform("baseTexture",0);
stateset->addUniform(baseTextureSampler);
osg::Uniform* ambientBias = new osg::Uniform("ambientBias",osg::Vec2(0.2f,0.8f));
stateset->addUniform(ambientBias);
}
// add the shadower and shadowed.