make sure another way it never calculates 0^0

[xonotic/darkplaces.git] / shader_glsl.h

diff --git a/shader_glsl.h b/shader_glsl.h
index befd8b53949cc9a7e24dae5b3b792e504b796779..12cc469e1dd9f28f48539fa9cb9e51eb0db89252 100644 (file)
--- a/shader_glsl.h
+++ b/shader_glsl.h
@@ -671,43 +671,43 @@
 "\n"
 "#ifdef USEOFFSETMAPPING\n"
 "uniform mediump vec4 OffsetMapping_ScaleSteps;\n"
-"#ifdef USEOFFSETMAPPING_LOD\n"\r
-"uniform mediump float OffsetMapping_LodDistance;\n"\r
-"#endif\n"
-"vec2 OffsetMapping(vec2 TexCoord, vec2 dPdx, vec2 dPdy)\n"\r
-"{\n"\r
-"      float i;\n"\r
-"      // distance-based LOD\n"\r
-"#ifdef USEOFFSETMAPPING_LOD\n"\r
-"      mediump float LODFactor = min(1.0, OffsetMapping_LodDistance / EyeVectorFogDepth.z);\n"\r
-"      mediump vec4 ScaleSteps = vec4(OffsetMapping_ScaleSteps.x, OffsetMapping_ScaleSteps.y * LODFactor, OffsetMapping_ScaleSteps.z / LODFactor, OffsetMapping_ScaleSteps.w * LODFactor);\n"\r
-"#else\n"\r
-"      #define ScaleSteps OffsetMapping_ScaleSteps\n"\r
-"#endif\n"\r
-"#ifdef USEOFFSETMAPPING_RELIEFMAPPING\n"\r
-"      float f;\n"\r
-"      // 14 sample relief mapping: linear search and then binary search\n"\r
-"      // this basically steps forward a small amount repeatedly until it finds\n"\r
-"      // itself inside solid, then jitters forward and back using decreasing\n"\r
-"      // amounts to find the impact\n"\r
-"      //vec3 OffsetVector = vec3(EyeVectorFogDepth.xy * ((1.0 / EyeVectorFogDepth.z) * ScaleSteps.x) * vec2(-1, 1), -1);\n"\r
-"      //vec3 OffsetVector = vec3(normalize(EyeVectorFogDepth.xy) * ScaleSteps.x * vec2(-1, 1), -1);\n"\r
-"      vec3 OffsetVector = vec3(normalize(EyeVectorFogDepth.xyz).xy * ScaleSteps.x * vec2(-1, 1), -1);\n"\r
-"      vec3 RT = vec3(TexCoord, 1);\n"\r
-"      OffsetVector *= ScaleSteps.z;\n"\r
-"      for(i = 1.0; i < ScaleSteps.y; ++i)\n"\r
-"              RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"\r
-"      for(i = 0.0, f = 1.0; i < ScaleSteps.w; ++i, f *= 0.5)\n"\r
-"              RT += OffsetVector * (step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z) * f - 0.5 * f);\n"\r
-"      return RT.xy;\n"\r
-"#else\n"\r
-"      // 2 sample offset mapping (only 2 samples because of ATI Radeon 9500-9800/X300 limits)\n"\r
-"      //vec2 OffsetVector = vec2(EyeVectorFogDepth.xy * ((1.0 / EyeVectorFogDepth.z) * ScaleSteps.x) * vec2(-1, 1));\n"\r
-"      //vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xy) * ScaleSteps.x * vec2(-1, 1));\n"\r
-"      vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xyz).xy * ScaleSteps.x * vec2(-1, 1));\n"\r
-"      OffsetVector *= ScaleSteps.z;\n"\r
-"      for(i = 0.0; i < ScaleSteps.y; ++i)\n"\r
-"              TexCoord += OffsetVector * (1.0 - dp_textureGrad(Texture_Normal, TexCoord, dPdx, dPdy).a);\n"\r
+"#ifdef USEOFFSETMAPPING_LOD\n"
+"uniform mediump float OffsetMapping_LodDistance;\n"
+"#endif\n"
+"vec2 OffsetMapping(vec2 TexCoord, vec2 dPdx, vec2 dPdy)\n"
+"{\n"
+"      float i;\n"
+"      // distance-based LOD\n"
+"#ifdef USEOFFSETMAPPING_LOD\n"
+"      mediump float LODFactor = min(1.0, OffsetMapping_LodDistance / EyeVectorFogDepth.z);\n"
+"      mediump vec4 ScaleSteps = vec4(OffsetMapping_ScaleSteps.x, OffsetMapping_ScaleSteps.y * LODFactor, OffsetMapping_ScaleSteps.z / LODFactor, OffsetMapping_ScaleSteps.w * LODFactor);\n"
+"#else\n"
+"      #define ScaleSteps OffsetMapping_ScaleSteps\n"
+"#endif\n"
+"#ifdef USEOFFSETMAPPING_RELIEFMAPPING\n"
+"      float f;\n"
+"      // 14 sample relief mapping: linear search and then binary search\n"
+"      // this basically steps forward a small amount repeatedly until it finds\n"
+"      // itself inside solid, then jitters forward and back using decreasing\n"
+"      // amounts to find the impact\n"
+"      //vec3 OffsetVector = vec3(EyeVectorFogDepth.xy * ((1.0 / EyeVectorFogDepth.z) * ScaleSteps.x) * vec2(-1, 1), -1);\n"
+"      //vec3 OffsetVector = vec3(normalize(EyeVectorFogDepth.xy) * ScaleSteps.x * vec2(-1, 1), -1);\n"
+"      vec3 OffsetVector = vec3(normalize(EyeVectorFogDepth.xyz).xy * ScaleSteps.x * vec2(-1, 1), -1);\n"
+"      vec3 RT = vec3(TexCoord, 1);\n"
+"      OffsetVector *= ScaleSteps.z;\n"
+"      for(i = 1.0; i < ScaleSteps.y; ++i)\n"
+"              RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
+"      for(i = 0.0, f = 1.0; i < ScaleSteps.w; ++i, f *= 0.5)\n"
+"              RT += OffsetVector * (step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z) * f - 0.5 * f);\n"
+"      return RT.xy;\n"
+"#else\n"
+"      // 2 sample offset mapping (only 2 samples because of ATI Radeon 9500-9800/X300 limits)\n"
+"      //vec2 OffsetVector = vec2(EyeVectorFogDepth.xy * ((1.0 / EyeVectorFogDepth.z) * ScaleSteps.x) * vec2(-1, 1));\n"
+"      //vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xy) * ScaleSteps.x * vec2(-1, 1));\n"
+"      vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xyz).xy * ScaleSteps.x * vec2(-1, 1));\n"
+"      OffsetVector *= ScaleSteps.z;\n"
+"      for(i = 0.0; i < ScaleSteps.y; ++i)\n"
+"              TexCoord += OffsetVector * (1.0 - dp_textureGrad(Texture_Normal, TexCoord, dPdx, dPdy).a);\n"
 "      return TexCoord;\n"
 "#endif\n"
 "}\n"
@@ -978,10 +978,10 @@
 "      // calculate directional shading\n"
 "      vec3 eyevector = position * -1.0;\n"
 "#  ifdef USEEXACTSPECULARMATH\n"
-"      myhalf specular = pow(cast_myhalf(max(float(dot(reflect(lightnormal, surfacenormal), normalize(eyevector)))*-1.0, 0.0)), SpecularPower * normalmap.a);\n"
+"      myhalf specular = pow(cast_myhalf(max(float(dot(reflect(lightnormal, surfacenormal), normalize(eyevector)))*-1.0, 0.0)), 0.25 + SpecularPower * normalmap.a);\n"
 "#  else\n"
 "      myhalf3 specularnormal = normalize(lightnormal + cast_myhalf3(normalize(eyevector)));\n"
-"      myhalf specular = pow(cast_myhalf(max(float(dot(surfacenormal, specularnormal)), 0.0)), SpecularPower * normalmap.a);\n"
+"      myhalf specular = pow(cast_myhalf(max(float(dot(surfacenormal, specularnormal)), 0.0)), 1.0 + SpecularPower * normalmap.a);\n"
 "#  endif\n"
 "#endif\n"
 "\n"
@@ -1237,10 +1237,10 @@
 "      color.rgb = diffusetex * (Color_Ambient + diffuse * Color_Diffuse);\n"
 "#ifdef USESPECULAR\n"
 "#ifdef USEEXACTSPECULARMATH\n"
-"      myhalf specular = pow(cast_myhalf(max(float(dot(reflect(lightnormal, surfacenormal), normalize(EyeVectorFogDepth.xyz)))*-1.0, 0.0)), SpecularPower * glosstex.a);\n"
+"      myhalf specular = pow(cast_myhalf(max(float(dot(reflect(lightnormal, surfacenormal), normalize(EyeVectorFogDepth.xyz)))*-1.0, 0.0)), 0.25 + SpecularPower * glosstex.a);\n"
 "#else\n"
 "      myhalf3 specularnormal = normalize(lightnormal + cast_myhalf3(normalize(EyeVectorFogDepth.xyz)));\n"
-"      myhalf specular = pow(cast_myhalf(max(float(dot(surfacenormal, specularnormal)), 0.0)), SpecularPower * glosstex.a);\n"
+"      myhalf specular = pow(cast_myhalf(max(float(dot(surfacenormal, specularnormal)), 0.0)), 1.0 + SpecularPower * glosstex.a);\n"
 "#endif\n"
 "      color.rgb += glosstex.rgb * (specular * Color_Specular);\n"
 "#endif\n"
@@ -1332,10 +1332,10 @@
 "      myhalf diffuse = cast_myhalf(max(float(dot(surfacenormal, lightnormal)), 0.0));\n"
 "#  ifdef USESPECULAR\n"
 "#   ifdef USEEXACTSPECULARMATH\n"
-"      myhalf specular = pow(cast_myhalf(max(float(dot(reflect(lightnormal, surfacenormal), normalize(EyeVectorFogDepth.xyz)))*-1.0, 0.0)), SpecularPower * glosstex.a);\n"
+"      myhalf specular = pow(cast_myhalf(max(float(dot(reflect(lightnormal, surfacenormal), normalize(EyeVectorFogDepth.xyz)))*-1.0, 0.0)), 0.25 + SpecularPower * glosstex.a);\n"
 "#   else\n"
 "      myhalf3 specularnormal = normalize(lightnormal + cast_myhalf3(normalize(EyeVectorFogDepth.xyz)));\n"
-"      myhalf specular = pow(cast_myhalf(max(float(dot(surfacenormal, specularnormal)), 0.0)), SpecularPower * glosstex.a);\n"
+"      myhalf specular = pow(cast_myhalf(max(float(dot(surfacenormal, specularnormal)), 0.0)), 1.0 + SpecularPower * glosstex.a);\n"
 "#   endif\n"
 "      color.rgb = diffusetex * Color_Ambient + (diffusetex * Color_Diffuse * diffuse + glosstex.rgb * Color_Specular * specular) * lightcolor;\n"
 "#  else\n"