Add parallax mapping for objects

components/nifogre/material.cpp

@@ -334,6 +334,10 @@ Ogre::String NIFMaterialLoader::getMaterial(const Nif::ShapeData *shapedata,
         instance->setProperty("detailMapUVSet", sh::makeProperty(new sh::IntValue(texprop->textures[Nif::NiTexturingProperty::DetailTexture].uvSet)));
     }
 
+    bool useParallax = !texName[Nif::NiTexturingProperty::BumpTexture].empty()
+            && texName[Nif::NiTexturingProperty::BumpTexture].find("_nh.") != std::string::npos;
+    instance->setProperty("use_parallax", sh::makeProperty(new sh::BooleanValue(useParallax)));
+
     for(int i = 0;i < 7;i++)
     {
         if(i == Nif::NiTexturingProperty::BaseTexture ||

files/materials/core.h

@@ -91,7 +91,7 @@ precision mediump float;
 
     #define shSamplerCube(name) uniform samplerCube name; @shUseSampler(name)
 
-    #define shMatrixMult(m, v) (m * v)
+    #define shMatrixMult(m, v) ((m) * (v))
 
     #define shOutputPosition gl_Position
 

files/materials/objects.mat

@@ -12,6 +12,7 @@ material openmw_objects_base
     use_detail_map false
     emissiveMapUVSet 0
     detailMapUVSet 0
+    use_parallax false
 
     scene_blend default
     depth_write default
@@ -37,6 +38,7 @@ material openmw_objects_base
             detailMap $detailMap
             env_map $env_map
             env_map_color $env_map_color
+            use_parallax $use_parallax
         }
 
         diffuse $diffuse

files/materials/objects.shader

@@ -18,6 +18,10 @@
 #define EMISSIVE_MAP @shPropertyHasValue(emissiveMap)
 #define DETAIL_MAP @shPropertyHasValue(detailMap)
 
+#define PARALLAX @shPropertyBool(use_parallax)
+#define PARALLAX_SCALE 0.04
+#define PARALLAX_BIAS -0.02
+
 // right now we support 2 UV sets max. implementing them is tedious, and we're probably not going to need more
 #define SECOND_UV_SET (@shPropertyString(emissiveMapUVSet) || @shPropertyString(detailMapUVSet))
 
@@ -265,7 +269,7 @@
         shUniform(float3, env_map_color) @shUniformProperty3f(env_map_color, env_map_color)
 #endif
 
-#if ENV_MAP || SPECULAR
+#if ENV_MAP || SPECULAR || PARALLAX
     shUniform(float3, cameraPosObjSpace) @shAutoConstant(cameraPosObjSpace, camera_position_object_space)
 #endif
 #if SPECULAR
@@ -345,21 +349,12 @@
 
     SH_START_PROGRAM
     {
+        float4 newUV = UV;
+
 #ifdef NEED_DEPTH
         float depthPassthrough = objSpacePositionPassthrough.w;
 #endif
 
-        float4 diffuse = shSample(diffuseMap, UV.xy);
-        shOutputColour(0) = diffuse;
-
-#if DETAIL_MAP
-#if @shPropertyString(detailMapUVSet)
-        shOutputColour(0) *= shSample(detailMap, UV.zw)*2;
-#else
-        shOutputColour(0) *= shSample(detailMap, UV.xy)*2;
-#endif
-#endif
-
 #if NEED_NORMAL
         float3 normal = normalPassthrough;
 #endif
@@ -372,11 +367,33 @@
             tbn = transpose(tbn);
         #endif
 
-        float3 TSnormal = shSample(normalMap, UV.xy).xyz * 2 - 1;
+        float4 normalTex = shSample(normalMap, UV.xy);
 
-        normal = normalize (shMatrixMult( transpose(tbn), TSnormal ));
+        normal = normalize (shMatrixMult( transpose(tbn), normalTex.xyz * 2 - 1 ));
 #endif
 
+#if ENV_MAP || SPECULAR || PARALLAX
+        float3 eyeDir = normalize(cameraPosObjSpace.xyz - objSpacePositionPassthrough.xyz);
+#endif
+
+#if PARALLAX
+        float3 TSeyeDir = normalize(shMatrixMult(tbn, eyeDir));
+
+        newUV += (TSeyeDir.xyxy * ( normalTex.a * PARALLAX_SCALE + PARALLAX_BIAS )).xyxy;
+#endif
+
+        float4 diffuse = shSample(diffuseMap, newUV.xy);
+        shOutputColour(0) = diffuse;
+
+#if DETAIL_MAP
+#if @shPropertyString(detailMapUVSet)
+        shOutputColour(0) *= shSample(detailMap, newUV.zw)*2;
+#else
+        shOutputColour(0) *= shSample(detailMap, newUV.xy)*2;
+#endif
+#endif
+
+
 #if !VERTEX_LIGHTING
         float3 viewPos = shMatrixMult(worldView, float4(objSpacePositionPassthrough.xyz,1)).xyz;
         float3 viewNormal = normalize(shMatrixMult(worldView, float4(normal.xyz, 0)).xyz);
@@ -458,16 +475,12 @@
 
 #if EMISSIVE_MAP
         #if @shPropertyString(emissiveMapUVSet)
-        shOutputColour(0).xyz += shSample(emissiveMap, UV.zw).xyz;
+        shOutputColour(0).xyz += shSample(emissiveMap, newUV.zw).xyz;
         #else
-        shOutputColour(0).xyz += shSample(emissiveMap, UV.xy).xyz;
+        shOutputColour(0).xyz += shSample(emissiveMap, newUV.xy).xyz;
         #endif
 #endif
 
-#if ENV_MAP || SPECULAR
-        float3 eyeDir = normalize(cameraPosObjSpace.xyz - objSpacePositionPassthrough.xyz);
-#endif
-
 #if ENV_MAP
         // Everything looks better with fresnel
         float facing = 1.0 - max(abs(dot(-eyeDir, normal)), 0);