AnotherFoxGuy/polyvox
1
0
Fork 0
Code Issues Pull Requests Activity

Created experimental texture atlas version for testing out ideas such as interpolation. Didn't simplify code yet as previously promised.

Browse Source 
Next task should probably be to simplify the code to remove unnecessary maps.
This commit is contained in:
David Williams
2008-01-13 19:56:42 +00:00
parent 38686782bb
commit 980b2d3664
4 changed files with 142 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
media/materials/programs/TextureAtlasFragmentProgram.cg
View File

@ -9,36 +9,36 @@ struct v2f
float4 main(v2f IN, uniform sampler2D colourMap : TEXUNIT0) : COLOR
{
/*OUT.TexCoordsXY.xy = OUT.Position.xy;
OUT.TexCoordsYZ.xy = OUT.Position.yz;
OUT.TexCoordsXZ.xy = OUT.Position.xz;*/
/*OUT.TexCoordsXY.xy /= textureScale;
OUT.TexCoordsYZ.xy /= textureScale;
OUT.TexCoordsXZ.xy /= textureScale;*/
float textureScalingFactor = 20.0f;
float textureSize = 512.0f;
float noOfTexturesPerDimension = 4.0;
IN.TexCoords /= 16;
//Scale the texture.
IN.TexCoords /= textureScalingFactor;
//Make sure texture coordinates are in the range 0.0 - 1.0 (or 0.9999? Is this necessary?)
IN.TexCoords.x = frac(IN.TexCoords.x);
IN.TexCoords.y = frac(IN.TexCoords.y);
IN.TexCoords.z = frac(IN.TexCoords.z);
IN.TexCoords /= 4.0;
float material = floor(IN.Alpha);
float y = floor(material / 4.0);
//float x = material - y;
float x = fmod(material,4.0);
//x = 1.0 - x;
float2 offset = float2(x,y);
offset /= 4.0;
//Now scale the texture coordinates to the right range for the texture atlas.
IN.TexCoords /= noOfTexturesPerDimension;
float3 colourMapValueXY = tex2D(colourMap, IN.TexCoords.xy + offset).rgb * abs(IN.Normal.z);
float3 colourMapValueYZ = tex2D(colourMap, IN.TexCoords.yz + offset).rgb * abs(IN.Normal.x);
float3 colourMapValueXZ = tex2D(colourMap, IN.TexCoords.xz + offset).rgb * abs(IN.Normal.y);
float3 colourMapValue = colourMapValueXY + colourMapValueYZ + colourMapValueXZ;
//colourMapValue /= 3.0;
//Next we compute the offset of the texture in the texture atlas
float material = floor(IN.Alpha);
float y = floor(material / noOfTexturesPerDimension);
float x = fmod(material,noOfTexturesPerDimension);
float2 offset = float2(x,y);
offset /= noOfTexturesPerDimension;
//Retrieve the 3 samples
float3 colourMapValueXY = tex2D(colourMap, IN.TexCoords.xy + offset).rgb * abs(IN.Normal.z);
float3 colourMapValueYZ = tex2D(colourMap, IN.TexCoords.yz + offset).rgb * abs(IN.Normal.x);
float3 colourMapValueXZ = tex2D(colourMap, IN.TexCoords.xz + offset).rgb * abs(IN.Normal.y);
return float4(colourMapValue*IN.Color.rgb,1.0);
//return float4(1.0,0.0,0.0,1.0);
//Blend according to triplanar texturing
float3 colourMapValue = colourMapValueXY + colourMapValueYZ + colourMapValueXZ;
//Return the result
return float4(colourMapValue*IN.Color.rgb,1.0);
}