NORSPEC-287 Make alpha sRGB correction curves match OpenGL spec.

6 files changed, 107 insertions, 16 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl b/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl
index 143af0576c..e80e4b0fcf 100755
--- a/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl
@@ -135,6 +135,26 @@ float pcfShadow(sampler2DShadow shadowMap, vec4 stc)
 }
 #endif
 
+vec3 srgb_to_linear(vec3 cs)
+{
+	
+/*        {  cs / 12.92,                 cs <= 0.04045
+    cl = {
+        {  ((cs + 0.055)/1.055)^2.4,   cs >  0.04045*/
+
+	return pow((cs+vec3(0.055))/vec3(1.055), vec3(2.4));
+}
+
+vec3 linear_to_srgb(vec3 cl)
+{
+	    /*{  0.0,                          0         <= cl
+            {  12.92 * c,                    0         <  cl < 0.0031308
+    cs = {  1.055 * cl^0.41666 - 0.055,   0.0031308 <= cl < 1
+            {  1.0,                                       cl >= 1*/
+
+	return 1.055 * pow(cl, vec3(0.41666)) - 0.055;
+}
+
 
 void main() 
 {
@@ -217,7 +237,7 @@ void main()
 #endif
 	vec4 gamma_diff = diff;
 
-	diff.rgb = pow(diff.rgb, vec3(2.2f, 2.2f, 2.2f));
+	diff.rgb = srgb_to_linear(diff.rgb);
 
 #ifdef USE_VERTEX_COLOR
 	float vertex_color_alpha = vertex_color.a;	
@@ -243,9 +263,8 @@ void main()
 
 	color.rgb = scaleSoftClip(color.rgb);
 
-	color.rgb = pow(color.rgb, vec3(2.2));
+	color.rgb = srgb_to_linear(color.rgb);
 	col = vec4(0,0,0,0);
-
 	
    #define LIGHT_LOOP(i) col.rgb += light_diffuse[i].rgb * calcPointLightOrSpotLight(pos.xyz, normal, light_position[i], light_direction[i].xyz, light_attenuation[i].x, light_attenuation[i].y, light_attenuation[i].z);
 
@@ -257,9 +276,9 @@ void main()
 	LIGHT_LOOP(6)
 	LIGHT_LOOP(7)
 
-	color.rgb += diff.rgb * pow(vary_pointlight_col, vec3(2.2)) * col.rgb;
+	color.rgb += diff.rgb * srgb_to_linear(vary_pointlight_col) * col.rgb;
 
-	color.rgb = pow(color.rgb, vec3(1.0/2.2));
+	color.rgb = linear_to_srgb(color.rgb);
 
 	frag_color = color;
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl b/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
index 53ade8ea64..027c6eeadb 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
@@ -30,6 +30,28 @@
 
 uniform float emissive_brightness;
 
+
+vec3 srgb_to_linear(vec3 cs)
+{
+	
+/*        {  cs / 12.92,                 cs <= 0.04045
+    cl = {
+        {  ((cs + 0.055)/1.055)^2.4,   cs >  0.04045*/
+
+	return pow((cs+vec3(0.055))/vec3(1.055), vec3(2.4));
+}
+
+vec3 linear_to_srgb(vec3 cl)
+{
+	    /*{  0.0,                          0         <= cl
+            {  12.92 * c,                    0         <  cl < 0.0031308
+    cs = {  1.055 * cl^0.41666 - 0.055,   0.0031308 <= cl < 1
+            {  1.0,                                       cl >= 1*/
+
+	return 1.055 * pow(cl, vec3(0.41666)) - 0.055;
+}
+
+
 #if (DIFFUSE_ALPHA_MODE == DIFFUSE_ALPHA_MODE_BLEND)
 
 #ifdef DEFINE_GL_FRAGCOLOR
@@ -459,7 +481,7 @@ void main()
 
 #if (DIFFUSE_ALPHA_MODE == DIFFUSE_ALPHA_MODE_BLEND)
 	vec3 old_diffcol = diffcol.rgb;
-	diffcol.rgb = pow(diffcol.rgb, vec3(2.2));
+	diffcol.rgb = srgb_to_linear(diffcol.rgb);
 #endif
 
 #if HAS_SPECULAR_MAP
@@ -648,7 +670,7 @@ void main()
 	col = mix(scaleSoftClip(col), fullbrightScaleSoftClip(col), diffuse.a);
 
 	//convert to linear space before adding local lights
-	col = pow(col, vec3(2.2));
+	col = srgb_to_linear(col);
 
 			
 	vec3 npos = normalize(-pos.xyz);
@@ -665,7 +687,7 @@ void main()
 
 
 	//convert to gamma space for display on screen
-	col.rgb = pow(col.rgb, vec3(1.0/2.2));
+	col.rgb = linear_to_srgb(col.rgb);
 
 	frag_color.rgb = col.rgb;
 	glare = min(glare, 1.0);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl
index a955ef6e9d..3ba6de8b76 100755
--- a/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl
@@ -99,6 +99,7 @@ void main()
 	norm = normalize(norm);
 	vec4 spec = texture2DRect(specularRect, frag.xy);
 	vec3 diff = texture2DRect(diffuseRect, frag.xy).rgb;
+	
 	float noise = texture2D(noiseMap, frag.xy/128.0).b;
 	vec3 out_col = vec3(0,0,0);
 	vec3 npos = normalize(-pos);
@@ -157,6 +158,7 @@ void main()
 		}
 	}
 	
+
 	frag_color.rgb = out_col;
 	frag_color.a = 0.0;
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl
index 7d39ad7bc1..11220bfa47 100755
--- a/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl
@@ -84,15 +84,30 @@ vec3 decode_normal (vec2 enc)
     return n;
 }
 
-vec4 correctWithGamma(vec4 col)
+vec3 srgb_to_linear(vec3 cs)
 {
-	return vec4(pow(col.rgb, vec3(2.2)), col.a);
+	
+/*        {  cs / 12.92,                 cs <= 0.04045
+    cl = {
+        {  ((cs + 0.055)/1.055)^2.4,   cs >  0.04045*/
+
+	return pow((cs+vec3(0.055))/vec3(1.055), vec3(2.4));
+}
+
+vec3 linear_to_srgb(vec3 cl)
+{
+	    /*{  0.0,                          0         <= cl
+            {  12.92 * c,                    0         <  cl < 0.0031308
+    cs = {  1.055 * cl^0.41666 - 0.055,   0.0031308 <= cl < 1
+            {  1.0,                                       cl >= 1*/
+
+	return 1.055 * pow(cl, vec3(0.41666)) - 0.055;
 }
 
 vec4 texture2DLodSpecular(sampler2D projectionMap, vec2 tc, float lod)
 {
 	vec4 ret = texture2DLod(projectionMap, tc, lod);
-	ret = correctWithGamma(ret);
+	ret.rgb = srgb_to_linear(ret.rgb);
 	
 	vec2 dist = tc-vec2(0.5);
 	
@@ -108,7 +123,7 @@ vec4 texture2DLodSpecular(sampler2D projectionMap, vec2 tc, float lod)
 vec4 texture2DLodDiffuse(sampler2D projectionMap, vec2 tc, float lod)
 {
 	vec4 ret = texture2DLod(projectionMap, tc, lod);
-	ret = correctWithGamma(ret);
+	ret.rgb = srgb_to_linear(ret.rgb);
 	
 	vec2 dist = vec2(0.5) - abs(tc-vec2(0.5));
 	
@@ -126,7 +141,7 @@ vec4 texture2DLodDiffuse(sampler2D projectionMap, vec2 tc, float lod)
 vec4 texture2DLodAmbient(sampler2D projectionMap, vec2 tc, float lod)
 {
 	vec4 ret = texture2DLod(projectionMap, tc, lod);
-	ret = correctWithGamma(ret);
+	ret.rgb = srgb_to_linear(ret.rgb);
 	
 	vec2 dist = tc-vec2(0.5);
 	
diff --git a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
index 6f2cfae6d2..a3610bfffa 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
@@ -38,9 +38,20 @@ VARYING vec2 vary_fragcoord;
 
 uniform float texture_gamma;
 
+vec3 linear_to_srgb(vec3 cl)
+{
+	    /*{  0.0,                          0         <= cl
+            {  12.92 * c,                    0         <  cl < 0.0031308
+    cs = {  1.055 * cl^0.41666 - 0.055,   0.0031308 <= cl < 1
+            {  1.0,                                       cl >= 1*/
+
+	return 1.055 * pow(cl, vec3(0.41666)) - 0.055;
+}
+
 void main() 
 {
 	vec4 diff = texture2DRect(diffuseRect, vary_fragcoord);
-	frag_color = pow(diff, vec4(texture_gamma, texture_gamma, texture_gamma, 1.0f));
+	diff.rgb = linear_to_srgb(diff.rgb);
+	frag_color = diff;
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
index f0d2746700..dc2519bd0a 100755
--- a/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
@@ -78,6 +78,28 @@ vec3 vary_AtmosAttenuation;
 uniform mat4 inv_proj;
 uniform vec2 screen_res;
 
+
+vec3 srgb_to_linear(vec3 cs)
+{
+	
+/*        {  cs / 12.92,                 cs <= 0.04045
+    cl = {
+        {  ((cs + 0.055)/1.055)^2.4,   cs >  0.04045*/
+
+	return pow((cs+vec3(0.055))/vec3(1.055), vec3(2.4));
+}
+
+vec3 linear_to_srgb(vec3 cl)
+{
+	    /*{  0.0,                          0         <= cl
+            {  12.92 * c,                    0         <  cl < 0.0031308
+    cs = {  1.055 * cl^0.41666 - 0.055,   0.0031308 <= cl < 1
+            {  1.0,                                       cl >= 1*/
+
+	return 1.055 * pow(cl, vec3(0.41666)) - 0.055;
+}
+
+
 vec3 decode_normal (vec2 enc)
 {
     vec2 fenc = enc*4-2;
@@ -313,7 +335,7 @@ void main()
 	vec4 diffuse = texture2DRect(diffuseRect, tc);
 
 	//convert to gamma space
-	diffuse.rgb = pow(diffuse.rgb, vec3(1.0/2.2));
+	diffuse.rgb = linear_to_srgb(diffuse.rgb);
 
 	vec4 spec = texture2DRect(specularRect, vary_fragcoord.xy);
 	vec3 col;
@@ -369,7 +391,7 @@ void main()
 			col = mix(scaleSoftClip(col), fullbrightScaleSoftClip(col), diffuse.a);
 		}
 
-		col = pow(col, vec3(2.2));
+		col = srgb_to_linear(col);
 
 		//col = vec3(1,0,1);
 		//col.g = envIntensity;