Merged in oak_tree_shadows (pull request #312)

Fix oak tree shadows

Approved-by: Louise Poubel <[email protected]>

oak_tree/materials/scripts/caster_fp.glsl

@@ -0,0 +1,16 @@
+varying vec4 vertex_depth;
+
+uniform sampler2D tex;
+varying vec2 uv;
+
+void main()
+{
+  if (texture2D(tex, uv).a < 0.5)
+  {
+    discard;
+  }
+
+  float depth = (vertex_depth.z) / vertex_depth.w;
+
+  gl_FragColor = vec4(depth, depth, depth, 1.0);
+}

oak_tree/materials/scripts/caster_vp.glsl

@@ -0,0 +1,16 @@
+uniform mat4 world_view_proj_mat;
+uniform vec4 texel_offsets;
+
+varying vec4 vertex_depth;
+
+varying vec2 uv;
+
+void main()
+{
+  vertex_depth = world_view_proj_mat * gl_Vertex;
+  gl_Position = vertex_depth;
+  gl_Position.xy += texel_offsets.zw * gl_Position.w;
+
+  uv = gl_MultiTexCoord0.xy;
+}
+

oak_tree/materials/scripts/oak_tree.material

@@ -2,6 +2,8 @@ material OakTree/Branch
 {
   technique
   {
+    shadow_caster_material "OakTree/shadow_caster_alpha"
+
     pass
     {
       alpha_rejection greater 128
@@ -27,3 +29,58 @@ material OakTree/Bark
     }
   }
 }
+
+vertex_program caster_vp_glsl glsl
+{
+  source caster_vp.glsl
+
+  default_params
+  {
+    param_named_auto world_view_proj_mat worldviewproj_matrix
+    param_named_auto texel_offsets texel_offsets
+  }
+
+}
+
+fragment_program caster_fp_glsl glsl
+{
+  source caster_fp.glsl
+
+  default_params
+  {
+    param_named tex int 0
+  }
+}
+
+
+material OakTree/shadow_caster_alpha
+{
+  transparency_casts_shadows on
+  technique
+  {
+    pass
+    {
+      // See: viewtopic.php?f=3&t=44817
+      fog_override true
+
+      cull_hardware none
+      cull_software none
+
+      alpha_rejection always_pass
+
+      vertex_program_ref caster_vp_glsl
+      {
+      }
+
+      fragment_program_ref caster_fp_glsl
+      {
+      }
+
+      texture_unit tex
+      {
+        // Pass the texture with alpha channel to the caster
+        texture branch_diffuse.png
+      }
+    }
+  }
+}