On 03/12/2012 03:40 PM, Jason Daly wrote:
On 03/12/2012 02:21 PM, Ethan Fahy wrote:
Thanks Jason,
So, since I can't combine programs (I didn't necessarily mean multiple shaders,
I just meant multiple programs), I decided to take this line of code:
program->addBindAttribLocation("indices", 6);
and move it to where I assemble my shader program and attach it to the node's
stateset. This way my nodeVisitor can still set my generic vertex array in
position 6 and my osg::Program's shader can access those index values by
including the following line in the frag shader:
in float indices;
I looked at the osg file that I wrote to disk and verified that my stateset's
program contained this line:
AttribBindingLocation indices 6
However, when I use indices in my shader, the resulting value is always equal
to 0.0, even though my VertexAttributeArray values range from 0.0 to 124.0. I
don't want to impose on you too much since you've already helped me out a great
deal, but I'm going to go ahead and attach an osg file that demonstrates this
behavior. The file is a simple human shape with 125 primitives. I created a
generic vertex array with index values sequential from 0-124. I also attached
a simple shader that paints everything green if the indices = 0 and red
otherwise. As you can see by opening this file in osgviewer, all values are
green. If you have time to look at it that would be fantastic but I completely
understand if you don't. Thanks again,
It seems that generic vertex attributes don't work in PER_PRIMITIVE mode
(at least not with shaders). Changing the binding to PER_VERTEX (and
adding enough values to cover all the vertices) makes it work. Have a look:
--"J"
Geode {
nodeMask 0xffffffff
cullingActive TRUE
StateSet {
rendering_hint DEFAULT_BIN
renderBinMode USE
binNumber 6
binName RenderBin
GL_LIGHTING OFF
Program {
name "Environment"
GeometryVerticesOut 1
GeometryInputType TRIANGLES
GeometryOutputType TRIANGLE_STRIP
AttribBindingLocation indices 6
num_shaders 2
Shader {
type FRAGMENT
code {
"varying float fIndices;
"
"void main(void)
"
"{
"
" vec4 color = gl_Color;
"
"
"
" if( fIndices == 0.0 ){
"
" color.r = 0.0;
"
" color.g = 1.0;
"
" color.b = 0.0;
"
" }else{
"
" color.r = 1.0;
"
" color.g = 0.0;
"
" color.b = 0.0;
"
" }
"
"
"
" gl_FragColor = color;
"
"
"
"}"
}
}
Shader {
type VERTEX
code {
"attribute float indices;
"
"varying float fIndices;
"
"void main(void)
"
"{
"
" gl_FrontColor = gl_Color;
"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;"
" fIndices = indices;
"
"}"
}
}
}
textureUnit 0 {
}
textureUnit 1 {
GL_TEXTURE_2D ON
Texture2D {
UniqueID Texture2D_0
wrap_s CLAMP_TO_EDGE
wrap_t CLAMP_TO_EDGE
wrap_r CLAMP_TO_EDGE
min_filter NEAREST
mag_filter NEAREST
maxAnisotropy 1
borderColor 0 0 0 0
borderWidth 0
useHardwareMipMapGeneration TRUE
unRefImageDataAfterApply FALSE
internalFormatMode USE_IMAGE_DATA_FORMAT
resizeNonPowerOfTwo FALSE
shadowComparison FALSE
shadowCompareFunc GL_LEQUAL
shadowTextureMode GL_LUMINANCE
}
}
}
num_drawables 1
Geometry {
useDisplayList TRUE
useVertexBufferObjects FALSE
PrimitiveSets 125
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VertexAttribBinding 6 PER_VERTEX
VertexAttribNormalize 6 FALSE
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}
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