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openmw/components/terrain/material.cpp

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#include "material.hpp"
#include <OgreMaterialManager.h>
#include <OgreTechnique.h>
#include <OgrePass.h>
#include <boost/functional/hash.hpp>
#if TERRAIN_USE_SHADER
#include <extern/shiny/Main/Factory.hpp>
#endif
namespace
{
int getBlendmapIndexForLayer (int layerIndex)
{
return std::floor((layerIndex-1)/4.f);
}
std::string getBlendmapComponentForLayer (int layerIndex)
{
int n = (layerIndex-1)%4;
if (n == 0)
return "x";
if (n == 1)
return "y";
if (n == 2)
return "z";
else
return "w";
}
}
namespace Terrain
{
MaterialGenerator::MaterialGenerator(bool shaders)
: mShaders(shaders)
, mShadows(false)
, mSplitShadows(false)
, mNormalMapping(true)
, mParallaxMapping(true)
{
}
Ogre::MaterialPtr MaterialGenerator::generate(Ogre::MaterialPtr mat)
{
assert(!mLayerList.empty() && "Can't create material with no layers");
return create(mat, false, false);
}
Ogre::MaterialPtr MaterialGenerator::generateForCompositeMapRTT(Ogre::MaterialPtr mat)
{
assert(!mLayerList.empty() && "Can't create material with no layers");
return create(mat, true, false);
}
Ogre::MaterialPtr MaterialGenerator::generateForCompositeMap(Ogre::MaterialPtr mat)
{
return create(mat, false, true);
}
Ogre::MaterialPtr MaterialGenerator::create(Ogre::MaterialPtr mat, bool renderCompositeMap, bool displayCompositeMap)
{
assert(!renderCompositeMap || !displayCompositeMap);
if (!mat.isNull())
{
#if TERRAIN_USE_SHADER
sh::Factory::getInstance().destroyMaterialInstance(mat->getName());
#endif
Ogre::MaterialManager::getSingleton().remove(mat->getName());
}
static int count = 0;
std::stringstream name;
name << "terrain/mat" << count++;
if (!mShaders)
{
mat = Ogre::MaterialManager::getSingleton().create(name.str(),
Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
Ogre::Technique* technique = mat->getTechnique(0);
technique->removeAllPasses();
if (displayCompositeMap)
{
Ogre::Pass* pass = technique->createPass();
pass->setVertexColourTracking(Ogre::TVC_AMBIENT|Ogre::TVC_DIFFUSE);
pass->createTextureUnitState(mCompositeMap)->setTextureAddressingMode(Ogre::TextureUnitState::TAM_CLAMP);
}
else
{
assert(mLayerList.size() == mBlendmapList.size()+1);
std::vector<Ogre::TexturePtr>::iterator blend = mBlendmapList.begin();
for (std::vector<LayerInfo>::iterator layer = mLayerList.begin(); layer != mLayerList.end(); ++layer)
{
Ogre::Pass* pass = technique->createPass();
pass->setLightingEnabled(false);
pass->setVertexColourTracking(Ogre::TVC_NONE);
// TODO: How to handle fog?
pass->setFog(true, Ogre::FOG_NONE);
bool first = (layer == mLayerList.begin());
Ogre::TextureUnitState* tus;
if (!first)
{
pass->setSceneBlending(Ogre::SBT_TRANSPARENT_ALPHA);
pass->setDepthFunction(Ogre::CMPF_EQUAL);
tus = pass->createTextureUnitState((*blend)->getName());
tus->setAlphaOperation(Ogre::LBX_BLEND_TEXTURE_ALPHA,
Ogre::LBS_TEXTURE,
Ogre::LBS_TEXTURE);
tus->setColourOperationEx(Ogre::LBX_BLEND_DIFFUSE_ALPHA,
Ogre::LBS_TEXTURE,
Ogre::LBS_TEXTURE);
tus->setIsAlpha(true);
tus->setTextureAddressingMode(Ogre::TextureUnitState::TAM_CLAMP);
float scale = (16/(16.f+1.f));
tus->setTextureScale(1.f/scale,1.f/scale);
}
// Add the actual layer texture on top of the alpha map.
tus = pass->createTextureUnitState(layer->mDiffuseMap);
if (!first)
tus->setColourOperationEx(Ogre::LBX_BLEND_DIFFUSE_ALPHA,
Ogre::LBS_TEXTURE,
Ogre::LBS_CURRENT);
tus->setTextureScale(1/16.f,1/16.f);
if (!first)
++blend;
}
if (!renderCompositeMap)
{
Ogre::Pass* lightingPass = technique->createPass();
lightingPass->setSceneBlending(Ogre::SBT_MODULATE);
lightingPass->setVertexColourTracking(Ogre::TVC_AMBIENT|Ogre::TVC_DIFFUSE);
lightingPass->setFog(true, Ogre::FOG_NONE);
}
}
return mat;
}
#if TERRAIN_USE_SHADER
else
{
sh::MaterialInstance* material = sh::Factory::getInstance().createMaterialInstance (name.str());
material->setProperty ("allow_fixed_function", sh::makeProperty<sh::BooleanValue>(new sh::BooleanValue(false)));
if (displayCompositeMap)
{
sh::MaterialInstancePass* p = material->createPass ();
p->setProperty ("vertex_program", sh::makeProperty<sh::StringValue>(new sh::StringValue("terrain_vertex")));
p->setProperty ("fragment_program", sh::makeProperty<sh::StringValue>(new sh::StringValue("terrain_fragment")));
p->mShaderProperties.setProperty ("is_first_pass", sh::makeProperty(new sh::BooleanValue(true)));
p->mShaderProperties.setProperty ("render_composite_map", sh::makeProperty(new sh::BooleanValue(false)));
p->mShaderProperties.setProperty ("display_composite_map", sh::makeProperty(new sh::BooleanValue(true)));
p->mShaderProperties.setProperty ("num_layers", sh::makeProperty (new sh::StringValue("0")));
p->mShaderProperties.setProperty ("num_blendmaps", sh::makeProperty (new sh::StringValue("0")));
p->mShaderProperties.setProperty ("normal_map_enabled", sh::makeProperty (new sh::BooleanValue(false)));
p->mShaderProperties.setProperty ("parallax_enabled", sh::makeProperty (new sh::BooleanValue(false)));
p->mShaderProperties.setProperty ("normal_maps",
sh::makeProperty (new sh::IntValue(0)));
sh::MaterialInstanceTextureUnit* tex = p->createTextureUnit ("compositeMap");
tex->setProperty ("direct_texture", sh::makeProperty (new sh::StringValue(mCompositeMap)));
tex->setProperty ("tex_address_mode", sh::makeProperty (new sh::StringValue("clamp")));
// shadow. TODO: repeated, put in function
if (mShadows)
{
for (Ogre::uint i = 0; i < (mSplitShadows ? 3 : 1); ++i)
{
sh::MaterialInstanceTextureUnit* shadowTex = p->createTextureUnit ("shadowMap" + Ogre::StringConverter::toString(i));
shadowTex->setProperty ("content_type", sh::makeProperty<sh::StringValue> (new sh::StringValue("shadow")));
}
}
p->mShaderProperties.setProperty ("shadowtexture_offset", sh::makeProperty (new sh::StringValue(
Ogre::StringConverter::toString(1))));
p->mShaderProperties.setProperty ("pass_index", sh::makeProperty(new sh::IntValue(0)));
}
else
{
bool shadows = mShadows && !renderCompositeMap;
int layerOffset = 0;
while (layerOffset < (int)mLayerList.size())
{
int blendmapOffset = (layerOffset == 0) ? 1 : 0; // the first layer of the first pass is the base layer and does not need a blend map
// Check how many layers we can fit in this pass
int numLayersInThisPass = 0;
int numBlendTextures = 0;
std::vector<std::string> blendTextures;
int remainingTextureUnits = OGRE_MAX_TEXTURE_LAYERS;
if (shadows)
remainingTextureUnits -= (mSplitShadows ? 3 : 1);
while (remainingTextureUnits && layerOffset + numLayersInThisPass < (int)mLayerList.size())
{
int layerIndex = numLayersInThisPass + layerOffset;
int neededTextureUnits=0;
int neededBlendTextures=0;
if (layerIndex != 0)
{
std::string blendTextureName = mBlendmapList[getBlendmapIndexForLayer(layerIndex)]->getName();
if (std::find(blendTextures.begin(), blendTextures.end(), blendTextureName) == blendTextures.end())
{
blendTextures.push_back(blendTextureName);
++neededBlendTextures;
++neededTextureUnits; // blend texture
}
}
++neededTextureUnits; // layer texture
// Check if this layer has a normal map
if (mNormalMapping && !mLayerList[layerIndex].mNormalMap.empty() && !renderCompositeMap)
++neededTextureUnits; // normal map
if (neededTextureUnits <= remainingTextureUnits)
{
// We can fit another!
remainingTextureUnits -= neededTextureUnits;
numBlendTextures += neededBlendTextures;
++numLayersInThisPass;
}
else
break; // We're full
}
sh::MaterialInstancePass* p = material->createPass ();
p->setProperty ("vertex_program", sh::makeProperty<sh::StringValue>(new sh::StringValue("terrain_vertex")));
p->setProperty ("fragment_program", sh::makeProperty<sh::StringValue>(new sh::StringValue("terrain_fragment")));
if (layerOffset != 0)
{
p->setProperty ("scene_blend", sh::makeProperty(new sh::StringValue("alpha_blend")));
// Only write if depth is equal to the depth value written by the previous pass.
p->setProperty ("depth_func", sh::makeProperty(new sh::StringValue("equal")));
}
p->mShaderProperties.setProperty ("render_composite_map", sh::makeProperty(new sh::BooleanValue(renderCompositeMap)));
p->mShaderProperties.setProperty ("display_composite_map", sh::makeProperty(new sh::BooleanValue(displayCompositeMap)));
p->mShaderProperties.setProperty ("num_layers", sh::makeProperty (new sh::StringValue(Ogre::StringConverter::toString(numLayersInThisPass))));
p->mShaderProperties.setProperty ("num_blendmaps", sh::makeProperty (new sh::StringValue(Ogre::StringConverter::toString(numBlendTextures))));
p->mShaderProperties.setProperty ("normal_map_enabled",
sh::makeProperty (new sh::BooleanValue(false)));
// blend maps
// the index of the first blend map used in this pass
int blendmapStart;
if (mLayerList.size() == 1) // special case. if there's only one layer, we don't need blend maps at all
blendmapStart = 0;
else
blendmapStart = getBlendmapIndexForLayer(layerOffset+blendmapOffset);
for (int i = 0; i < numBlendTextures; ++i)
{
sh::MaterialInstanceTextureUnit* blendTex = p->createTextureUnit ("blendMap" + Ogre::StringConverter::toString(i));
blendTex->setProperty ("direct_texture", sh::makeProperty (new sh::StringValue(mBlendmapList[blendmapStart+i]->getName())));
blendTex->setProperty ("tex_address_mode", sh::makeProperty (new sh::StringValue("clamp")));
}
// layer maps
bool anyNormalMaps = false;
bool anyParallax = false;
size_t normalMaps = 0;
for (int i = 0; i < numLayersInThisPass; ++i)
{
const LayerInfo& layer = mLayerList[layerOffset+i];
// diffuse map
sh::MaterialInstanceTextureUnit* diffuseTex = p->createTextureUnit ("diffuseMap" + Ogre::StringConverter::toString(i));
diffuseTex->setProperty ("direct_texture", sh::makeProperty (new sh::StringValue(layer.mDiffuseMap)));
// normal map (optional)
bool useNormalMap = mNormalMapping && !mLayerList[layerOffset+i].mNormalMap.empty() && !renderCompositeMap;
bool useParallax = useNormalMap && mParallaxMapping && layer.mParallax;
bool useSpecular = layer.mSpecular;
if (useNormalMap)
{
anyNormalMaps = true;
anyParallax = anyParallax || useParallax;
sh::MaterialInstanceTextureUnit* normalTex = p->createTextureUnit ("normalMap" + Ogre::StringConverter::toString(i));
normalTex->setProperty ("direct_texture", sh::makeProperty (new sh::StringValue(layer.mNormalMap)));
}
p->mShaderProperties.setProperty ("use_normal_map_" + Ogre::StringConverter::toString(i),
sh::makeProperty (new sh::BooleanValue(useNormalMap)));
p->mShaderProperties.setProperty ("use_parallax_" + Ogre::StringConverter::toString(i),
sh::makeProperty (new sh::BooleanValue(useParallax)));
p->mShaderProperties.setProperty ("use_specular_" + Ogre::StringConverter::toString(i),
sh::makeProperty (new sh::BooleanValue(useSpecular)));
boost::hash_combine(normalMaps, useNormalMap);
boost::hash_combine(normalMaps, useNormalMap && layer.mParallax);
boost::hash_combine(normalMaps, useSpecular);
if (i+layerOffset > 0)
{
int blendTextureIndex = getBlendmapIndexForLayer(layerOffset+i);
std::string blendTextureComponent = getBlendmapComponentForLayer(layerOffset+i);
p->mShaderProperties.setProperty ("blendmap_component_" + Ogre::StringConverter::toString(i),
sh::makeProperty (new sh::StringValue(Ogre::StringConverter::toString(blendTextureIndex-blendmapStart) + "." + blendTextureComponent)));
}
else
{
// just to make it shut up about blendmap_component_0 not existing in the first pass.
// it might be retrieved, but will never survive the preprocessing step.
p->mShaderProperties.setProperty ("blendmap_component_" + Ogre::StringConverter::toString(i),
sh::makeProperty (new sh::StringValue("")));
}
}
p->mShaderProperties.setProperty ("normal_map_enabled",
sh::makeProperty (new sh::BooleanValue(anyNormalMaps)));
p->mShaderProperties.setProperty ("parallax_enabled",
sh::makeProperty (new sh::BooleanValue(anyParallax)));
// Since the permutation handler can't handle dynamic property names,
// combine normal map settings for all layers into one value
p->mShaderProperties.setProperty ("normal_maps",
sh::makeProperty (new sh::IntValue(normalMaps)));
// shadow
if (shadows)
{
for (Ogre::uint i = 0; i < (mSplitShadows ? 3 : 1); ++i)
{
sh::MaterialInstanceTextureUnit* shadowTex = p->createTextureUnit ("shadowMap" + Ogre::StringConverter::toString(i));
shadowTex->setProperty ("content_type", sh::makeProperty<sh::StringValue> (new sh::StringValue("shadow")));
}
}
p->mShaderProperties.setProperty ("shadowtexture_offset", sh::makeProperty (new sh::StringValue(
Ogre::StringConverter::toString(numBlendTextures + numLayersInThisPass))));
// Make sure the pass index is fed to the permutation handler, because blendmap components may be different
p->mShaderProperties.setProperty ("pass_index", sh::makeProperty(new sh::IntValue(layerOffset)));
assert ((int)p->mTexUnits.size() == OGRE_MAX_TEXTURE_LAYERS - remainingTextureUnits);
layerOffset += numLayersInThisPass;
}
}
}
#endif
return Ogre::MaterialManager::getSingleton().getByName(name.str());
}
}
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