Hi,
I have some problems while using geometry shader and TextureArray to optimize
PSSM shadow, the test code is like following:
C++ code:
osg::TextureArray *ta = new osg::TextureArray;
ta->setTextureSize(1024, 1024, 3); //3 layer texture
...
shadowCamera->attach(osg::Camera::COLOR_BUFFER, ta, 0, 0); //
shadowCamera->attach(osg::Camera::COLOR_BUFFER, ta, 0, 1);
shadowCamera->attach(osg::Camera::COLOR_BUFFER, ta, 0, 2);
Geometry shader code:
#extension GL_EXT_geometry_shader4 : require
varying vec4 color;
void main()
{
//Route to Layer 0
for (int i = 0; i < 3; i++)
{
// You will recieve 3 positions since we set the input type to Triangles
gl_Position = 0.5*gl_PositionIn[i] - vec4(0.5, 0.0, 0.0, 1.0);
gl_FrontColor = vec4(1.0, 0.0, 0.0,1.0);
gl_Layer = 0;
EmitVertex();
}
EndPrimitive();
//Route to Layer 1
for (int i = 0; i < 3; i++)
{
gl_Position = 0.5*gl_PositionIn[i];
//Just to see a difference in Layer 1
gl_FrontColor = vec4(0.0, 1.0, 0.0,1.0);
gl_Layer = 1;
EmitVertex();
}
EndPrimitive();
//Route to Layer 2
for (int i = 0; i < 3; i++)
{
gl_Position = 0.5*gl_PositionIn[i] + vec4(0.5, 0.0, 0.0, 1.0);
//Just to see a difference in Layer 1
gl_FrontColor = vec4(0.0, 1.0, 0.0,1.0);
gl_Layer = 2;
EmitVertex();
}
EndPrimitive();
}
during the testing , only the 1st layer of texture have avaliable context(scene
with red color), other 2 layers are undefined. Has some one sucessed in layer
rendering? please give some advise, thanks a lot!
Cheers,
xiakai
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=25314#25314
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