add tonemapping shaders

shader/ToneMapping.glsl

@@ -1,4 +1,4 @@
-/*
+/*
 
 This shader experiments the effect of different tone mapping operators.
 This is still a work in progress.
@@ -17,69 +17,44 @@ Zavie
 
 */
 
-vec3 linearToneMapping(vec3 color)
-{
-	float exposure = 1.;
-	color = clamp(exposure * color, 0., 1.);
-	color = pow(color, vec3(1. / gamma));
-	return color;
-}
+uniform float u_Exposure;
 
-vec3 simpleReinhardToneMapping(vec3 color)
-{
-	float exposure = 1.5;
-	color *= exposure/(1. + color / exposure);
-	color = pow(color, vec3(1. / gamma));
-	return color;
-}
 
-vec3 lumaBasedReinhardToneMapping(vec3 color)
+vec3 toneMap(vec3 color)
 {
-	float luma = dot(color, vec3(0.2126, 0.7152, 0.0722));
-	float toneMappedLuma = luma / (1. + luma);
-	color *= toneMappedLuma / luma;
-	color = pow(color, vec3(1. / gamma));
-	return color;
-}
+    color *= u_Exposure;
 
-vec3 whitePreservingLumaBasedReinhardToneMapping(vec3 color)
-{
-	float white = 2.;
-	float luma = dot(color, vec3(0.2126, 0.7152, 0.0722));
-	float toneMappedLuma = luma * (1. + luma / (white*white)) / (1. + luma);
-	color *= toneMappedLuma / luma;
-	color = pow(color, vec3(1. / gamma));
-	return color;
-}
+#ifdef TONEMAP_UNCHARTED
+    return toneMapUncharted(color);
+#endif
 
-vec3 RomBinDaHouseToneMapping(vec3 color)
-{
-    color = exp( -1.0 / ( 2.72*color + 0.15 ) );
-	color = pow(color, vec3(1. / gamma));
-	return color;
-}
+#ifdef TONEMAP_HEJLRICHARD
+    return toneMapHejlRichard(color);
+#endif
 
-vec3 filmicToneMapping(vec3 color)
-{
-	color = max(vec3(0.), color - vec3(0.004));
-	color = (color * (6.2 * color + .5)) / (color * (6.2 * color + 1.7) + 0.06);
-	return color;
-}
+#ifdef TONEMAP_ACES
+    return toneMapACES(color);
+#endif
 
-vec3 Uncharted2ToneMapping(vec3 color)
-{
-	float A = 0.15;
-	float B = 0.50;
-	float C = 0.10;
-	float D = 0.20;
-	float E = 0.02;
-	float F = 0.30;
-	float W = 11.2;
-	float exposure = 2.;
-	color *= exposure;
-	color = ((color * (A * color + C * B) + D * E) / (color * (A * color + B) + D * F)) - E / F;
-	float white = ((W * (A * W + C * B) + D * E) / (W * (A * W + B) + D * F)) - E / F;
-	color /= white;
-	color = pow(color, vec3(1. / gamma));
-	return color;
+#ifdef TONEMAP_LINEAR
+    return linearToneMapping(color);
+#endif//TONEMAP_LINEAR
+
+#ifdef TONEMAP_SIMPLE_REINHARD
+    return simpleReinhardToneMapping(color)
+#endif//TONEMAP_SIMPLE_REINHARD
+
+#ifdef TONEMAP_LUMA_BASED_REINHARD
+    return lumaBasedReinhardToneMapping(color)
+#endif//TONE_MAP_LUMA_BASED_REINHARD
+
+#ifdef TONEMAP_WHITE_PRESERVING_LUMA_BASED_REINHARD
+    return whitePreservingLumaBasedReinhardToneMapping(color)
+#endif//TONEMAP_WHITE_PRESERVING_LUMA_BASED_REINHARD
+
+#ifdef TONEMAP_ROM_BIN_DA_HOUSE
+    return RomBinDaHouseToneMapping(color)
+#endif//TONEMAP_ROM_BIN_DA_HOUSE
+
+    return linearTosRGB(color);
 }