Hi,
i have a small problem. I want to access gl_TextureMatrix[8] within my Shader.
As you can see i used a loop to setup 10 texture matrices:
Code:
for (int i = 0; i < 10; i++) {
stateSet->setTextureAttributeAndModes(i, texMat,
osg::StateAttribute::ON);
}
But when i try to access gl_TextureMatrix[8] not the matrix i was hoping.
I checked some build in limits for example:
GL_MAX_TEXTURE_UNITS is 34018.
Just change the used gl_TextureMatrix[n] to n=8 to see that no texture matrix
is returned.
Code:
#include <osg/Group>
#include <osg/Geode>
#include <osgViewer/Viewer>
#include <osgGA/TrackballManipulator>
#include <osgViewer/CompositeViewer>
#include <osg/ShapeDrawable>
#include <osg/Node>
#include <osg/MatrixTransform>
#include <osg/TexMat>
#include <osgViewer/Viewer>
#include <osg/Texture2DArray>
#include <osgDB/ReadFile>
#include <string>
#include <stdio.h>
#include <iostream>
using namespace osg;
osg::TexMat* texMat = new osg::TexMat;
osgViewer::View* viewB = new osgViewer::View;
void applyShader(Geode* geode) {
ref_ptr<Program> program = new Program;
program->setName("TexturesTest");
ref_ptr<Shader> vertObj = new Shader(Shader::VERTEX);
ref_ptr<Shader> fragObj = new Shader(Shader::FRAGMENT);
program->addShader(vertObj.get());
program->addShader(fragObj.get());
ref_ptr<StateSet> stateSet = new osg::StateSet;
ref_ptr<Uniform> texturesUniform = new
Uniform(Uniform::SAMPLER_2D_ARRAY,
"textures", 1);
stateSet->addUniform(texturesUniform.get());
stateSet->setAttributeAndModes(program.get(), StateAttribute::ON);
ref_ptr<Texture2DArray> textureArray = new Texture2DArray;
//textureArray->setInternalFormat(GL_RGBA16F_ARB);
//textureArray->setSourceFormat(GL_RGBA);
//textureArray->setSourceType(GL_FLOAT);
textureArray->setFilter(osg::Texture2DArray::MIN_FILTER,
osg::Texture2DArray::NEAREST);
textureArray->setFilter(osg::Texture2DArray::MAG_FILTER,
osg::Texture2DArray::NEAREST);
textureArray->setWrap(osg::Texture::WRAP_S,
osg::Texture::CLAMP_TO_BORDER);
textureArray->setWrap(osg::Texture::WRAP_T,
osg::Texture::CLAMP_TO_BORDER);
textureArray->setWrap(osg::Texture::WRAP_R,
osg::Texture::CLAMP_TO_BORDER);
textureArray->setTextureDepth(2);
textureArray->setImage(0, osgDB::readImageFile("src/foo2.jpg"));
textureArray->setImage(1, osgDB::readImageFile("src/foo2.jpg"));
stateSet->setTextureAttribute(0, textureArray.get(),
osg::StateAttribute::ON);
for (int i = 0; i < 10; i++) {
stateSet->setTextureAttributeAndModes(i, texMat,
osg::StateAttribute::ON);
}
std::string vertSource = "varying vec4 vPos;"
"void main()"
"{"
"vPos = gl_Vertex;"
"gl_Position = ftransform();"
"}";
vertObj->setShaderSource(vertSource);
std::string fragSource = "#version 120\n"
"#extension GL_EXT_gpu_shader4 : enable\n"
"#extension GL_EXT_texture_array : enable\n"
"varying vec4 vPos;"
"uniform sampler2DArray textures;"
""
"void main()"
"{"
"vec4 coords = gl_TextureMatrix[7] * vPos;"
"gl_FragColor = texture2DArray(textures, vec3(coords.st, 0));"
"}";
fragObj->setShaderSource(fragSource);
geode->setStateSet(stateSet.get());
}
int main(int argc, char** argv) {
// setNotifyLevel(osg::DEBUG_INFO);
// Create a cube
ref_ptr<Group> rootNode = new Group;
Box* cube = new Box(Vec3(0, 0, 0), 1.0f);
ShapeDrawable* drawable = new ShapeDrawable(cube);
Geode* geode = new Geode();
geode->addDrawable(drawable);
rootNode->addChild(geode);
// Apply our shader to this cube
applyShader(geode);
osg::ArgumentParser arguments(&argc, argv);
osgViewer::CompositeViewer viewer(arguments);
viewer.addView(viewB);
viewB->setUpViewInWindow(10, 650, 640, 480);
viewB->setSceneData(rootNode.get());
viewB->setCameraManipulator(new osgGA::TrackballManipulator);
while (!viewer.done()) {
osg::Matrix mat = viewB->getCamera()->getViewMatrix()
* viewB->getCamera()->getProjectionMatrix();
mat = mat * osg::Matrix::scale(0.5, 0.5, 1) *
osg::Matrix::translate(
0.5, 0.5, 0);
texMat->setMatrix(mat);
viewer.frame();
}
return 0;
}
Is there a buildin limit for texture matrices? Or am i doing something wrong
about the setup of texture matrices? When iam using the 1-7 matrices everything
works as expected but i need some more.
Thank you!
Cheers,
Johannes
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=18365#18365
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