Add specular mapping for terrain

apps/openmw/mwrender/renderingmanager.cpp

@@ -197,8 +197,9 @@ namespace MWRender
         mWater.reset(new Water(mRootNode, sceneRoot, mResourceSystem, mViewer->getIncrementalCompileOperation(), fallback, resourcePath));
 
         mTerrain.reset(new Terrain::TerrainGrid(sceneRoot, mResourceSystem, mViewer->getIncrementalCompileOperation(),
-                                                new TerrainStorage(mResourceSystem->getVFS(), Settings::Manager::getString("normal map pattern", "Shaders"), Settings::Manager::getBool("auto use terrain normal maps", "Shaders")),
-                                                    Mask_Terrain, &mResourceSystem->getSceneManager()->getShaderManager(), mUnrefQueue.get()));
+                                                new TerrainStorage(mResourceSystem->getVFS(), Settings::Manager::getString("normal map pattern", "Shaders"), Settings::Manager::getBool("auto use terrain normal maps", "Shaders"),
+                                                     Settings::Manager::getString("terrain specular map pattern", "Shaders"), Settings::Manager::getBool("auto use terrain specular maps", "Shaders")),
+                                                 Mask_Terrain, &mResourceSystem->getSceneManager()->getShaderManager(), mUnrefQueue.get()));
 
         mCamera.reset(new Camera(mViewer->getCamera()));
 

apps/openmw/mwrender/terrainstorage.cpp

@@ -9,8 +9,8 @@
 namespace MWRender
 {
 
-    TerrainStorage::TerrainStorage(const VFS::Manager* vfs, const std::string& normalMapPattern, bool autoUseNormalMaps)
-        : ESMTerrain::Storage(vfs, normalMapPattern, autoUseNormalMaps)
+    TerrainStorage::TerrainStorage(const VFS::Manager* vfs, const std::string& normalMapPattern, bool autoUseNormalMaps, const std::string& specularMapPattern, bool autoUseSpecularMaps)
+        : ESMTerrain::Storage(vfs, normalMapPattern, autoUseNormalMaps, specularMapPattern, autoUseSpecularMaps)
     {
     }
 

apps/openmw/mwrender/terrainstorage.hpp

@@ -14,7 +14,7 @@ namespace MWRender
         virtual const ESM::LandTexture* getLandTexture(int index, short plugin);
     public:
 
-        TerrainStorage(const VFS::Manager* vfs, const std::string& normalMapPattern = "", bool autoUseNormalMaps = false);
+        TerrainStorage(const VFS::Manager* vfs, const std::string& normalMapPattern = "", bool autoUseNormalMaps = false, const std::string& specularMapPattern = "", bool autoUseSpecularMaps = false);
 
         /// Get bounds of the whole terrain in cell units
         virtual void getBounds(float& minX, float& maxX, float& minY, float& maxY);

components/esmterrain/storage.cpp

@@ -18,10 +18,12 @@ namespace ESMTerrain
 
     const float defaultHeight = -2048;
 
-    Storage::Storage(const VFS::Manager *vfs, const std::string& normalMapPattern, bool autoUseNormalMaps)
+    Storage::Storage(const VFS::Manager *vfs, const std::string& normalMapPattern, bool autoUseNormalMaps, const std::string& specularMapPattern, bool autoUseSpecularMaps)
         : mVFS(vfs)
         , mNormalMapPattern(normalMapPattern)
         , mAutoUseNormalMaps(autoUseNormalMaps)
+        , mSpecularMapPattern(specularMapPattern)
+        , mAutoUseSpecularMaps(autoUseSpecularMaps)
     {
     }
 
@@ -510,7 +512,7 @@ namespace ESMTerrain
             return found->second;
 
         Terrain::LayerInfo info;
-        info.mParallax = false;
+        //info.mParallax = false;
         info.mSpecular = false;
         info.mDiffuseMap = texture;
 
@@ -532,17 +534,16 @@ namespace ESMTerrain
                 info.mNormalMap = texture_;
         }
 
-        /*
+        if (mAutoUseSpecularMaps)
         {
             std::string texture_ = texture;
-            boost::replace_last(texture_, ".", "_diffusespec.");
+            boost::replace_last(texture_, ".", mSpecularMapPattern + ".");
             if (mVFS->exists(texture_))
             {
                 info.mDiffuseMap = texture_;
                 info.mSpecular = true;
             }
         }
-        */
 
         mLayerInfoMap[texture] = info;
 
@@ -553,7 +554,7 @@ namespace ESMTerrain
     {
         Terrain::LayerInfo info;
         info.mDiffuseMap = "textures\\_land_default.dds";
-        info.mParallax = false;
+        //info.mParallax = false;
         info.mSpecular = false;
         return info;
     }

components/esmterrain/storage.hpp

@@ -27,7 +27,7 @@ namespace ESMTerrain
         virtual const ESM::LandTexture* getLandTexture(int index, short plugin) = 0;
 
     public:
-        Storage(const VFS::Manager* vfs, const std::string& normalMapPattern = "", bool autoUseNormalMaps = false);
+        Storage(const VFS::Manager* vfs, const std::string& normalMapPattern = "", bool autoUseNormalMaps = false, const std::string& specularMapPattern = "", bool autoUseSpecularMaps = false);
 
         /// Data is loaded first, if necessary. Will return a 0-pointer if there is no data for
         /// any of the data types specified via \a flags. Will also return a 0-pointer if there
@@ -112,6 +112,9 @@ namespace ESMTerrain
         std::string mNormalMapPattern;
         bool mAutoUseNormalMaps;
 
+        std::string mSpecularMapPattern;
+        bool mAutoUseSpecularMaps;
+
         Terrain::LayerInfo getLayerInfo(const std::string& texture);
     };
 

components/terrain/defs.hpp

@@ -18,8 +18,10 @@ namespace Terrain
     {
         std::string mDiffuseMap;
         std::string mNormalMap;
-        bool mParallax; // Height info in normal map alpha channel?
+        //bool mParallax; // Height info in normal map alpha channel?
         bool mSpecular; // Specular info in diffuse map alpha channel?
+
+        bool requiresShaders() const { return !mNormalMap.empty() || mSpecular; }
     };
 
 }

components/terrain/material.cpp

@@ -129,6 +129,7 @@ namespace Terrain
             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);

components/terrain/material.hpp

@@ -23,6 +23,7 @@ namespace Terrain
     {
         osg::ref_ptr<osg::Texture2D> mDiffuseMap;
         osg::ref_ptr<osg::Texture2D> mNormalMap; // optional
+        bool mSpecular;
     };
 
     class FixedFunctionTechnique : public osgFX::Technique

components/terrain/terraingrid.cpp

@@ -162,6 +162,7 @@ osg::ref_ptr<osg::Node> TerrainGrid::buildTerrain (osg::Group* parent, float chu
             for (std::vector<LayerInfo>::const_iterator it = layerList.begin(); it != layerList.end(); ++it)
             {
                 TextureLayer textureLayer;
+                textureLayer.mSpecular = it->mSpecular;
                 osg::ref_ptr<osg::Texture2D> texture = mTextureCache[it->mDiffuseMap];
                 if (!texture)
                 {
@@ -187,9 +188,11 @@ osg::ref_ptr<osg::Node> TerrainGrid::buildTerrain (osg::Group* parent, float chu
                     }
                     textureCompileDummy->getOrCreateStateSet()->setTextureAttributeAndModes(dummyTextureCounter++, texture);
                     textureLayer.mNormalMap = texture;
-                    useShaders = true;
                 }
 
+                if (it->requiresShaders())
+                    useShaders = true;
+
                 layers.push_back(textureLayer);
             }
         }

files/settings-default.cfg

@@ -189,6 +189,8 @@ auto use object specular maps = false
 # See 'auto use object normal maps'. Affects terrain.
 auto use terrain normal maps = false
 
+# If a file with pattern 'terrain specular map pattern' exists, use that file as a 'diffuse specular' map. The texture
+# must contain the layer color in the RGB channel (as usual), and a specular multiplier in the alpha channel.
 auto use terrain specular maps = false
 
 # The filename pattern to probe for when detecting normal maps (see 'auto use object normal maps', 'auto use terrain normal maps')
@@ -196,6 +198,8 @@ normal map pattern = _n
 
 specular map pattern = _spec
 
+terrain specular map pattern = _diffusespec
+
 [Input]
 
 # Capture control of the cursor prevent movement outside the window.

files/shaders/terrain_fragment.glsl

@@ -19,10 +19,10 @@ varying float depth;
 #if !PER_PIXEL_LIGHTING
 varying vec4 lighting;
 #else
-varying vec3 passViewPos;
-varying vec3 passViewNormal;
 varying vec4 passColor;
 #endif
+varying vec3 passViewPos;
+varying vec3 passViewNormal;
 
 #include "lighting.glsl"
 
@@ -30,16 +30,15 @@ void main()
 {
     vec2 diffuseMapUV = (gl_TextureMatrix[0] * vec4(uv, 0.0, 1.0)).xy;
 
-    gl_FragData[0] = vec4(texture2D(diffuseMap, diffuseMapUV).xyz, 1.0);
+    vec4 diffuseTex = texture2D(diffuseMap, diffuseMapUV);
+    gl_FragData[0] = vec4(diffuseTex.xyz, 1.0);
 
 #if @blendMap
     vec2 blendMapUV = (gl_TextureMatrix[1] * vec4(uv, 0.0, 1.0)).xy;
     gl_FragData[0].a *= texture2D(blendMap, blendMapUV).a;
 #endif
 
-#if PER_PIXEL_LIGHTING
     vec3 viewNormal = passViewNormal;
-#endif
 
 #if @normalMap
     vec3 normalTex = texture2D(normalMap, diffuseMapUV).xyz;
@@ -59,6 +58,16 @@ void main()
     gl_FragData[0] *= doLighting(passViewPos, normalize(viewNormal), passColor);
 #endif
 
+#if @specularMap
+    float shininess = 128; // TODO: make configurable
+    vec3 matSpec = vec3(diffuseTex.a, diffuseTex.a, diffuseTex.a);
+#else
+    float shininess = gl_FrontMaterial.shininess;
+    vec3 matSpec = gl_FrontMaterial.specular.xyz;
+#endif
+
+    gl_FragData[0].xyz += getSpecular(normalize(viewNormal), normalize(passViewPos), shininess, matSpec);
+
     float fogValue = clamp((depth - gl_Fog.start) * gl_Fog.scale, 0.0, 1.0);
     gl_FragData[0].xyz = mix(gl_FragData[0].xyz, gl_Fog.color.xyz, fogValue);
 }

files/shaders/terrain_vertex.glsl

@@ -8,10 +8,10 @@ varying float depth;
 #if !PER_PIXEL_LIGHTING
 varying vec4 lighting;
 #else
-varying vec3 passViewPos;
-varying vec3 passViewNormal;
 varying vec4 passColor;
 #endif
+varying vec3 passViewPos;
+varying vec3 passViewNormal;
 
 #include "lighting.glsl"
 
@@ -27,10 +27,10 @@ void main(void)
 #if !PER_PIXEL_LIGHTING
     lighting = doLighting(viewPos.xyz, viewNormal, gl_Color);
 #else
-    passViewPos = viewPos.xyz;
-    passViewNormal = viewNormal;
     passColor = gl_Color;
 #endif
+    passViewNormal = viewNormal;
+    passViewPos = viewPos.xyz;
 
     uv = gl_MultiTexCoord0.xy;
 }