ShaderTechnique::ShaderTechnique(Shader::ShaderManager& shaderManager, bool forcePerPixelLighting, bool clampLighting, const std::vector<TextureLayer>& layers,
const std::vector<osg::ref_ptr<osg::Texture2D> >& blendmaps, int blendmapScale, float layerTileSize)
{
bool firstLayer = true;
int i=0;
for (std::vector<TextureLayer>::const_iterator it = layers.begin(); it != layers.end(); ++it)
{
osg::ref_ptr<osg::StateSet> stateset (new osg::StateSet);
if (!firstLayer)
{
stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
osg::ref_ptr<osg::Depth> depth (new osg::Depth);
depth->setFunction(osg::Depth::EQUAL);
stateset->setAttributeAndModes(depth, osg::StateAttribute::ON);
}
int texunit = 0;
stateset->setTextureAttributeAndModes(texunit, it->mDiffuseMap);
osg::ref_ptr<osg::TexMat> texMat (new osg::TexMat);
texMat->setMatrix(osg::Matrix::scale(osg::Vec3f(layerTileSize,layerTileSize,1.f)));
stateset->setTextureAttributeAndModes(texunit, texMat, osg::StateAttribute::ON);
stateset->addUniform(new osg::Uniform("diffuseMap", texunit));
if(!firstLayer)
{
++texunit;
osg::ref_ptr<osg::Texture2D> blendmap = blendmaps.at(i++);
stateset->setTextureAttributeAndModes(texunit, blendmap.get());
// This is to map corner vertices directly to the center of a blendmap texel.
osg::Matrixf texMat;
float scale = (blendmapScale/(static_cast<float>(blendmapScale)+1.f));
texMat.preMultTranslate(osg::Vec3f(0.5f, 0.5f, 0.f));
texMat.preMultScale(osg::Vec3f(scale, scale, 1.f));
texMat.preMultTranslate(osg::Vec3f(-0.5f, -0.5f, 0.f));
stateset->setTextureAttributeAndModes(texunit, new osg::TexMat(texMat));
stateset->addUniform(new osg::Uniform("blendMap", texunit));
}
if (it->mNormalMap)
{
++texunit;
stateset->setTextureAttributeAndModes(texunit, it->mNormalMap);
stateset->addUniform(new osg::Uniform("normalMap", texunit));
}
Shader::ShaderManager::DefineMap defineMap;
defineMap["forcePPL"] = forcePerPixelLighting ? "1" : "0";
defineMap["clamp"] = clampLighting ? "1" : "0";
defineMap["normalMap"] = (it->mNormalMap) ? "1" : "0";
defineMap["blendMap"] = !firstLayer ? "1" : "0";
defineMap["colorMode"] = "2";
defineMap["specularMap"] = it->mSpecular ? "1" : "0";
osg::ref_ptr<osg::Shader> vertexShader = shaderManager.getShader("terrain_vertex.glsl", defineMap, osg::Shader::VERTEX);
osg::ref_ptr<osg::Shader> fragmentShader = shaderManager.getShader("terrain_fragment.glsl", defineMap, osg::Shader::FRAGMENT);
if (!vertexShader || !fragmentShader)
throw std::runtime_error("Unable to create shader");
stateset->setAttributeAndModes(shaderManager.getProgram(vertexShader, fragmentShader));
firstLayer = false;
addPass(stateset);
}
}
ShaderTechnique::ShaderTechnique(Shader::ShaderManager& shaderManager, bool forcePerPixelLighting, bool clampLighting, const std::vector<TextureLayer>& layers,
const std::vector<osg::ref_ptr<osg::Texture2D> >& blendmaps, int blendmapScale, float layerTileSize)
{
bool firstLayer = true;
int i=0;
for (std::vector<TextureLayer>::const_iterator it = layers.begin(); it != layers.end(); ++it)
{
osg::ref_ptr<osg::StateSet> stateset (new osg::StateSet);
if (!firstLayer)
{
stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
stateset->setAttributeAndModes(getEqualDepth(), osg::StateAttribute::ON);
}
int texunit = 0;
stateset->setTextureAttributeAndModes(texunit, it->mDiffuseMap);
stateset->setTextureAttributeAndModes(texunit, getLayerTexMat(layerTileSize), osg::StateAttribute::ON);
stateset->addUniform(new osg::Uniform("diffuseMap", texunit));
if(!firstLayer)
{
++texunit;
osg::ref_ptr<osg::Texture2D> blendmap = blendmaps.at(i++);
stateset->setTextureAttributeAndModes(texunit, blendmap.get());
stateset->setTextureAttributeAndModes(texunit, getBlendmapTexMat(blendmapScale));
stateset->addUniform(new osg::Uniform("blendMap", texunit));
}
if (it->mNormalMap)
{
++texunit;
stateset->setTextureAttributeAndModes(texunit, it->mNormalMap);
stateset->addUniform(new osg::Uniform("normalMap", texunit));
}
Shader::ShaderManager::DefineMap defineMap;
defineMap["forcePPL"] = forcePerPixelLighting ? "1" : "0";
defineMap["clamp"] = clampLighting ? "1" : "0";
defineMap["normalMap"] = (it->mNormalMap) ? "1" : "0";
defineMap["blendMap"] = !firstLayer ? "1" : "0";
defineMap["colorMode"] = "2";
defineMap["specularMap"] = it->mSpecular ? "1" : "0";
defineMap["parallax"] = (it->mNormalMap && it->mParallax) ? "1" : "0";
osg::ref_ptr<osg::Shader> vertexShader = shaderManager.getShader("terrain_vertex.glsl", defineMap, osg::Shader::VERTEX);
osg::ref_ptr<osg::Shader> fragmentShader = shaderManager.getShader("terrain_fragment.glsl", defineMap, osg::Shader::FRAGMENT);
if (!vertexShader || !fragmentShader)
throw std::runtime_error("Unable to create shader");
stateset->setAttributeAndModes(shaderManager.getProgram(vertexShader, fragmentShader));
firstLayer = false;
addPass(stateset);
}
}