make sure gloss never calculates 0^0

[xonotic/darkplaces.git] / shader_hlsl.h

diff --git a/shader_hlsl.h b/shader_hlsl.h
index 1296711385ed4c8770000b70bfa2f8e9475d46e9..2fa3e6d7c0f89f5f46308896444a29a53a6b8fce 100644 (file)
--- a/shader_hlsl.h
+++ b/shader_hlsl.h
@@ -2,6 +2,9 @@
 "// written by Forest 'LordHavoc' Hale\n"
 "// shadowmapping enhancements by Lee 'eihrul' Salzman\n"
 "\n"
+"// not REALLY the smallest value (2^-62 would be correct), but short and any compiler failing at parsing this is broken\n"
+"#define FLT_MIN 0.000000000000000001\n"
+"\n"
 "// FIXME: we need to get rid of ModelViewProjectionPosition to make room for the texcoord for this\n"
 "#if defined(USEREFLECTION)\n"
 "#undef USESHADOWMAPORTHO\n"
@@ -936,10 +939,10 @@
 "      // calculate directional shading\n"
 "      float3 eyevector = position * -1.0;\n"
 "#  ifdef USEEXACTSPECULARMATH\n"
-"      half specular = half(pow(half(max(float(dot(reflect(lightnormal, surfacenormal), normalize(eyevector)))*-1.0, 0.0)), SpecularPower * normalmap.a));\n"
+"      half specular = half(pow(half(max(float(dot(reflect(lightnormal, surfacenormal), normalize(eyevector)))*-1.0, FLT_MIN)), SpecularPower * normalmap.a));\n"
 "#  else\n"
 "      half3 specularnormal = half3(normalize(lightnormal + half3(normalize(eyevector))));\n"
-"      half specular = half(pow(half(max(float(dot(surfacenormal, specularnormal)), 0.0)), SpecularPower * normalmap.a));\n"
+"      half specular = half(pow(half(max(float(dot(surfacenormal, specularnormal)), FLT_MIN)), SpecularPower * normalmap.a));\n"
 "#  endif\n"
 "#endif\n"
 "\n"
@@ -1351,10 +1354,10 @@
 "      color.rgb = diffusetex * (Color_Ambient + diffuse * Color_Diffuse);\n"
 "#ifdef USESPECULAR\n"
 "#ifdef USEEXACTSPECULARMATH\n"
-"      half specular = half(pow(half(max(float(dot(reflect(lightnormal, surfacenormal), normalize(EyeVector)))*-1.0, 0.0)), SpecularPower * glosstex.a));\n"
+"      half specular = half(pow(half(max(float(dot(reflect(lightnormal, surfacenormal), normalize(EyeVector)))*-1.0, FLT_MIN)), SpecularPower * glosstex.a));\n"
 "#else\n"
 "      half3 specularnormal = half3(normalize(lightnormal + half3(normalize(EyeVector))));\n"
-"      half specular = half(pow(half(max(float(dot(surfacenormal, specularnormal)), 0.0)), SpecularPower * glosstex.a));\n"
+"      half specular = half(pow(half(max(float(dot(surfacenormal, specularnormal)), FLT_MIN)), SpecularPower * glosstex.a));\n"
 "#endif\n"
 "      color.rgb += glosstex.rgb * (specular * Color_Specular);\n"
 "#endif\n"
@@ -1473,10 +1476,10 @@
 "      half diffuse = half(max(float(dot(surfacenormal, lightnormal)), 0.0));\n"
 "#  ifdef USESPECULAR\n"
 "#   ifdef USEEXACTSPECULARMATH\n"
-"      half specular = half(pow(half(max(float(dot(reflect(lightnormal, surfacenormal), normalize(EyeVector)))*-1.0, 0.0)), SpecularPower * glosstex.a));\n"
+"      half specular = half(pow(half(max(float(dot(reflect(lightnormal, surfacenormal), normalize(EyeVector)))*-1.0, FLT_MIN)), SpecularPower * glosstex.a));\n"
 "#   else\n"
 "      half3 specularnormal = half3(normalize(lightnormal + half3(normalize(EyeVector))));\n"
-"      half specular = half(pow(half(max(float(dot(surfacenormal, specularnormal)), 0.0)), SpecularPower * glosstex.a));\n"
+"      half specular = half(pow(half(max(float(dot(surfacenormal, specularnormal)), FLT_MIN)), SpecularPower * glosstex.a));\n"
 "#   endif\n"
 "      color.rgb = diffusetex * Color_Ambient + (diffusetex * Color_Diffuse * diffuse + glosstex.rgb * Color_Specular * specular) * lightcolor;\n"
 "#  else\n"