Merging r5975 through r6036 from trunk to ogl-es branch.

GLES drivers adapted, but only did make compile-tests.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6038 dfc29bdd-3216-0410-991c-e03cc46cb475

media/pp_d3d9.hlsl

@@ -0,0 +1,43 @@
+
+// Texture size to calculate texel center
+float2 TextureSize;
+
+// Vertex shader output struct
+struct VS_OUTPUT
+{
+    float4 Position  : POSITION0;
+    float2 TexCoords : TEXCOORD0;
+};
+
+VS_OUTPUT vertexMain(
+    float4 Position  : POSITION0, 
+    float2 TexCoords : TEXCOORD0
+    )
+{
+    VS_OUTPUT OUT;
+    OUT.Position = Position;
+    
+    // In practice, instead of passing in TextureSize,
+    // pass 1.0 / TextureSize for better performance
+    
+    // TexCoords is set to the texel center
+    OUT.TexCoords = TexCoords + 1.0 / TextureSize / 2.0;
+    
+    return OUT;
+}
+
+// Texture sampler
+sampler2D TextureSampler;
+
+float4 pixelMain ( float2 Texcoords : TEXCOORD0 ) : COLOR0
+{
+    // Texture is sampled at Texcoords using tex2D
+    float4 Color = tex2D(TextureSampler, Texcoords);
+    
+    // Change Texcoords to sample pixels around
+    
+    // Inverse the color to produce negative image effect
+    Color.rgb = 1.0 - Color.rgb;
+    
+    return Color;
+};