forked from 0ad/0ad
80 lines
2.0 KiB
GLSL
80 lines
2.0 KiB
GLSL
!!ARBfp1.0
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#if USE_FP_SHADOW
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OPTION ARB_fragment_program_shadow;
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#endif
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PARAM ambient = program.local[0];
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#if DECAL
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PARAM shadingColor = program.local[1];
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#endif
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#if USE_SHADOW_PCF
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PARAM shadowOffsets1 = program.local[2];
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PARAM shadowOffsets2 = program.local[3];
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TEMP offset;
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#endif
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TEMP tex;
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TEMP temp;
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TEMP diffuse;
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TEMP color;
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#if BLEND
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// Use alpha from blend texture
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// TODO: maybe we should invert the texture instead of doing SUB here?
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TEX tex.a, fragment.texcoord[1], texture[1], 2D;
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SUB result.color.a, 1.0, tex.a;
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#endif
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// Load diffuse colour
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TEX color, fragment.texcoord[0], texture[0], 2D;
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#if DECAL
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// Use alpha from main texture
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MOV result.color.a, color;
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#endif
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// Compute color = texture * (ambient + diffuse*shadow)
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// (diffuse is 2*fragment.color due to clamp-avoidance in the vertex program)
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#if USE_SHADOW
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#if USE_FP_SHADOW
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#if USE_SHADOW_PCF
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MOV offset.zw, fragment.texcoord[2];
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ADD offset.xy, fragment.texcoord[2], shadowOffsets1;
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TEX temp.x, offset, texture[2], SHADOW2D;
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ADD offset.xy, fragment.texcoord[2], shadowOffsets1.zwzw;
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TEX temp.y, offset, texture[2], SHADOW2D;
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ADD offset.xy, fragment.texcoord[2], shadowOffsets2;
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TEX temp.z, offset, texture[2], SHADOW2D;
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ADD offset.xy, fragment.texcoord[2], shadowOffsets2.zwzw;
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TEX temp.w, offset, texture[2], SHADOW2D;
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DP4 temp, temp, 0.25;
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#else
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TEX temp, fragment.texcoord[2], texture[2], SHADOW2D;
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#endif
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#else
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TEX tex, fragment.texcoord[2], texture[2], 2D;
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MOV_SAT temp.z, fragment.texcoord[2].z;
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SGE temp, tex.x, temp.z;
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#endif
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MUL diffuse.rgb, fragment.color, 2.0;
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MAD temp.rgb, diffuse, temp, ambient;
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MUL color.rgb, color, temp;
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#else
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MAD temp.rgb, fragment.color, 2.0, ambient;
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MUL color.rgb, color, temp;
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#endif
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// Multiply everything by the LOS texture
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TEX tex.a, fragment.texcoord[3], texture[3], 2D;
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MUL color.rgb, color, tex.a;
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#if DECAL
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MUL result.color.rgb, color, shadingColor;
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#else
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MOV result.color.rgb, color;
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#endif
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END
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