Add shader implementation of alpha test

components/nifogre/material.cpp

@@ -355,11 +355,17 @@ Ogre::String NIFMaterialLoader::getMaterial(const Nif::ShapeData *shapedata,
 
     if((alphaFlags>>9)&1)
     {
+#ifndef ANDROID
         std::string reject;
         reject += getTestMode((alphaFlags>>10)&0x7);
         reject += " ";
         reject += Ogre::StringConverter::toString(alphaTest);
         instance->setProperty("alpha_rejection", sh::makeProperty(new sh::StringValue(reject)));
+#else
+        // alpha test not supported in OpenGL ES 2, use manual implementation in shader
+        instance->setProperty("alphaTestMode", sh::makeProperty(new sh::IntValue((alphaFlags>>10)&0x7)));
+        instance->setProperty("alphaTestValue", sh::makeProperty(new sh::FloatValue(alphaTest/255.f)));
+#endif
     }
     else
         instance->getMaterial()->setShadowCasterMaterial("openmw_shadowcaster_noalpha");

files/materials/objects.mat

@@ -29,6 +29,9 @@ material openmw_objects_base
     env_map false
     env_map_color 1 1 1
 
+    alphaTestMode 0
+    alphaTestValue 0
+
     pass
     {
         vertex_program openmw_objects_vertex
@@ -50,6 +53,8 @@ material openmw_objects_base
             env_map $env_map
             env_map_color $env_map_color
             use_parallax $use_parallax
+            alphaTestMode $alphaTestMode
+            alphaTestValue $alphaTestValue
         }
 
         diffuse $diffuse

files/materials/objects.shader

@@ -23,6 +23,8 @@
 #define DARK_MAP @shPropertyHasValue(darkMap)
 #define SPEC_MAP @shPropertyHasValue(specMap) && SPECULAR
 
+#define ALPHATEST_MODE @shPropertyString(alphaTestMode)
+
 #define PARALLAX @shPropertyBool(use_parallax)
 #define PARALLAX_SCALE 0.04
 #define PARALLAX_BIAS -0.02
@@ -354,6 +356,10 @@
     #endif
 #endif
 
+#if ALPHATEST_MODE != 0
+    shUniform(float, alphaTestValue) @shUniformProperty1f(alphaTestValue, alphaTestValue)
+#endif
+
     SH_START_PROGRAM
     {
         float4 newUV = UV;
@@ -399,6 +405,29 @@
         float4 diffuse = float4(1,1,1,1);
 #endif
 
+#if ALPHATEST_MODE == 1
+        if (diffuse.a >= alphaTestValue)
+            discard;
+#elif ALPHATEST_MODE == 2
+        if (diffuse.a != alphaTestValue)
+            discard;
+#elif ALPHATEST_MODE == 3
+        if (diffuse.a > alphaTestValue)
+            discard;
+#elif ALPHATEST_MODE == 4
+        if (diffuse.a <= alphaTestValue)
+            discard;
+#elif ALPHATEST_MODE == 5
+        if (diffuse.a == alphaTestValue)
+            discard;
+#elif ALPHATEST_MODE == 6
+        if (diffuse.a < alphaTestValue)
+            discard;
+#elif ALPHATEST_MODE == 7
+        discard;
+#endif
+
+
 #if DETAIL_MAP
 #if @shPropertyString(detailMapUVSet)
         diffuse *= shSample(detailMap, newUV.zw)*2;