slightly better non-VSDCT shadowmap code

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11347 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/shader_glsl.h b/shader_glsl.h
index b4f43c2c278d95a4da9f46592805f66e8bdbbbf8..4e37e273f7feecbf4156cb08e695e8603c70a582 100644 (file)
--- a/shader_glsl.h
+++ b/shader_glsl.h
@@ -748,18 +748,19 @@
 "vec3 GetShadowMapTC2D(vec3 dir)\n"
 "{\n"
 "      vec3 adir = abs(dir);\n"
-"      vec2 aparams = ShadowMap_Parameters.xy / max(max(adir.x, adir.y), adir.z);\n"
+"      vec2 mparams = ShadowMap_Parameters.xy / max(max(adir.x, adir.y), adir.z);\n"
 "      vec4 proj = dp_textureCube(Texture_CubeProjection, dir);\n"
-"      return vec3(mix(dir.xy, dir.zz, proj.xy) * aparams.x + proj.zw * ShadowMap_Parameters.z, aparams.y + ShadowMap_Parameters.w);\n"
+"      return vec3(mix(dir.xy, dir.zz, proj.xy) * mparams.x + proj.zw * ShadowMap_Parameters.z, mparams.y + ShadowMap_Parameters.w);\n"
 "}\n"
 "#  else\n"
 "vec3 GetShadowMapTC2D(vec3 dir)\n"
 "{\n"
-"   vec3 adir = abs(dir);\n"
-"   vec2 aparams = ShadowMap_Parameters.xy / max(max(adir.x, adir.y), adir.z);\n"
-"   vec4 proj = adir.x > adir.y ? (adir.x > adir.z ? vec4(dir.zy, dir.x < 0.0 ? 1.5 : 0.5, 0.5) : vec4(dir.xy, dir.z < 0.0 ? 1.5 : 0.5, 2.5)) :\n" 
-"                                 (adir.y > adir.z ? vec4(dir.xz, dir.y < 0.0 ? 1.5 : 0.5, 1.5) : vec4(dir.xy, dir.z < 0.0 ? 1.5 : 0.5, 2.5));\n"
-"   return vec3(proj.xy * aparams.x + proj.zw * ShadowMap_Parameters.z, aparams.y + ShadowMap_Parameters.w);\n"
+"      vec3 adir = abs(dir);\n"
+"      float m; vec4 proj;\n"
+"      if (adir.x > adir.y) { m = adir.x; proj = vec4(dir.zyx, 0.5); } else { m = adir.y; proj = vec4(dir.xzy, 1.5); }\n"
+"      if (adir.z > m) { m = adir.z; proj = vec4(dir, 2.5); }\n"
+"      vec2 mparams = ShadowMap_Parameters.xy / m;\n"
+"      return vec3(proj.xy * mparams.x + vec2(proj.z < 0.0 ? 1.5 : 0.5, proj.w) * ShadowMap_Parameters.z, mparams.y + ShadowMap_Parameters.w);\n"
 "}\n"
 "#  endif\n"
 "# endif\n"

diff --git a/shader_hlsl.h b/shader_hlsl.h
index 4f73330f6f9aaa3a122fa6aa8bdf3e44835c56b0..4b6da04ed694702a5f0433cb26c2d8f03e4f920b 100644 (file)
--- a/shader_hlsl.h
+++ b/shader_hlsl.h
@@ -589,23 +589,22 @@
 "float3 GetShadowMapTC2D(float3 dir, float4 ShadowMap_Parameters, samplerCUBE Texture_CubeProjection)\n"
 "{\n"
 "      float3 adir = abs(dir);\n"
-"      float2 aparams = ShadowMap_Parameters.xy / max(max(adir.x, adir.y), adir.z);\n"
+"      float2 mparams = ShadowMap_Parameters.xy / max(max(adir.x, adir.y), adir.z);\n"
 "      float4 proj = texCUBE(Texture_CubeProjection, dir);\n"
-"      return float3(lerp(dir.xy, dir.zz, proj.xy) * aparams.x + proj.zw * ShadowMap_Parameters.z, aparams.y + ShadowMap_Parameters.w);\n"
+"      return float3(lerp(dir.xy, dir.zz, proj.xy) * mparams.x + proj.zw * ShadowMap_Parameters.z, mparams.y + ShadowMap_Parameters.w);\n"
 "}\n"
 "#  else\n"
 "float3 GetShadowMapTC2D(float3 dir, float4 ShadowMap_Parameters)\n"
 "{\n"
 "      float3 adir = abs(dir);\n"
-"      float ma = adir.z;\n"
-"      float4 proj = float4(dir, 2.5);\n"
-"      if (adir.x > ma) { ma = adir.x; proj = float4(dir.zyx, 0.5); }\n"
-"      if (adir.y > ma) { ma = adir.y; proj = float4(dir.xzy, 1.5); }\n"
+"      float m; float4 proj;\n"
+"      if (adir.x > adir.y) { m = adir.x; proj = float4(dir.zyx, 0.5); } else { m = adir.y; proj = float4(dir.xzy, 1.5); }\n"
+"      if (adir.z > m) { m = adir.z; proj = float4(dir, 2.5); }\n"
 "#ifdef HLSL\n"
-"      return float3(proj.xy * ShadowMap_Parameters.x / ma + float2(0.5,0.5) + float2(proj.z < 0.0 ? 1.5 : 0.5, proj.w) * ShadowMap_Parameters.z, ma + 64 * ShadowMap_Parameters.w);\n"
+"      return float3(proj.xy * ShadowMap_Parameters.x / m + float2(0.5,0.5) + float2(proj.z < 0.0 ? 1.5 : 0.5, proj.w) * ShadowMap_Parameters.z, m + 64 * ShadowMap_Parameters.w);\n"
 "#else\n"
-"      float2 aparams = ShadowMap_Parameters.xy / ma;\n"
-"      return float3(proj.xy * aparams.x + float2(proj.z < 0.0 ? 1.5 : 0.5, proj.w) * ShadowMap_Parameters.z, aparams.y + ShadowMap_Parameters.w);\n"
+"      float2 mparams = ShadowMap_Parameters.xy / m;\n"
+"      return float3(proj.xy * mparams.x + float2(proj.z < 0.0 ? 1.5 : 0.5, proj.w) * ShadowMap_Parameters.z, mparams.y + ShadowMap_Parameters.w);\n"
 "#endif\n"
 "}\n"
 "#  endif\n"