diff options
Diffstat (limited to 'indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl')
-rw-r--r-- | indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl | 158 |
1 files changed, 146 insertions, 12 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl index cd37a34e0d..64e6bc9da2 100644 --- a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl +++ b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl @@ -23,30 +23,164 @@ * $/LicenseInfo$ */ -#extension GL_ARB_texture_rectangle : enable - /*[EXTRA_CODE_HERE]*/ -#ifdef DEFINE_GL_FRAGCOLOR out vec4 frag_color; -#else -#define frag_color gl_FragColor -#endif -uniform sampler2DRect diffuseRect; +uniform sampler2D diffuseRect; +uniform sampler2D exposureMap; uniform vec2 screen_res; -VARYING vec2 vary_fragcoord; -uniform float display_gamma; +in vec2 vary_fragcoord; vec3 linear_to_srgb(vec3 cl); +//=============================================================== +// tone mapping taken from Khronos sample implementation +//=============================================================== + +// sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT +const mat3 ACESInputMat = mat3 +( + 0.59719, 0.07600, 0.02840, + 0.35458, 0.90834, 0.13383, + 0.04823, 0.01566, 0.83777 +); + + +// ODT_SAT => XYZ => D60_2_D65 => sRGB +const mat3 ACESOutputMat = mat3 +( + 1.60475, -0.10208, -0.00327, + -0.53108, 1.10813, -0.07276, + -0.07367, -0.00605, 1.07602 +); + +// ACES tone map (faster approximation) +// see: https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/ +vec3 toneMapACES_Narkowicz(vec3 color) +{ + const float A = 2.51; + const float B = 0.03; + const float C = 2.43; + const float D = 0.59; + const float E = 0.14; + return clamp((color * (A * color + B)) / (color * (C * color + D) + E), 0.0, 1.0); +} + + +// ACES filmic tone map approximation +// see https://github.com/TheRealMJP/BakingLab/blob/master/BakingLab/ACES.hlsl +vec3 RRTAndODTFit(vec3 color) +{ + vec3 a = color * (color + 0.0245786) - 0.000090537; + vec3 b = color * (0.983729 * color + 0.4329510) + 0.238081; + return a / b; +} + + +// tone mapping +vec3 toneMapACES_Hill(vec3 color) +{ + color = ACESInputMat * color; + + // Apply RRT and ODT + color = RRTAndODTFit(color); + + color = ACESOutputMat * color; + + // Clamp to [0, 1] + color = clamp(color, 0.0, 1.0); + + return color; +} + +uniform float exposure; +uniform float gamma; + +vec3 toneMap(vec3 color) +{ +#ifndef NO_POST + float exp_scale = texture(exposureMap, vec2(0.5,0.5)).r; + + color *= exposure * exp_scale; + + // mix ACES and Linear here as a compromise to avoid over-darkening legacy content + color = mix(toneMapACES_Hill(color), color, 0.333); +#endif + + return color; +} + +//=============================================================== + +//================================= +// borrowed noise from: +// <https://www.shadertoy.com/view/4dS3Wd> +// By Morgan McGuire @morgan3d, http://graphicscodex.com +// +float hash(float n) { return fract(sin(n) * 1e4); } +float hash(vec2 p) { return fract(1e4 * sin(17.0 * p.x + p.y * 0.1) * (0.1 + abs(sin(p.y * 13.0 + p.x)))); } + +float noise(float x) { + float i = floor(x); + float f = fract(x); + float u = f * f * (3.0 - 2.0 * f); + return mix(hash(i), hash(i + 1.0), u); +} + +float noise(vec2 x) { + vec2 i = floor(x); + vec2 f = fract(x); + + // Four corners in 2D of a tile + float a = hash(i); + float b = hash(i + vec2(1.0, 0.0)); + float c = hash(i + vec2(0.0, 1.0)); + float d = hash(i + vec2(1.0, 1.0)); + + // Simple 2D lerp using smoothstep envelope between the values. + // return vec3(mix(mix(a, b, smoothstep(0.0, 1.0, f.x)), + // mix(c, d, smoothstep(0.0, 1.0, f.x)), + // smoothstep(0.0, 1.0, f.y))); + + // Same code, with the clamps in smoothstep and common subexpressions + // optimized away. + vec2 u = f * f * (3.0 - 2.0 * f); + return mix(a, b, u.x) + (c - a) * u.y * (1.0 - u.x) + (d - b) * u.x * u.y; +} + +//============================= + + +vec3 legacyGamma(vec3 color) +{ + vec3 c = 1. - clamp(color, vec3(0.), vec3(1.)); + c = 1. - pow(c, vec3(gamma)); // s/b inverted already CPU-side + + return c; +} + void main() { //this is the one of the rare spots where diffuseRect contains linear color values (not sRGB) - vec4 diff = texture2DRect(diffuseRect, vary_fragcoord); - //diff.rgb = pow(diff.rgb, vec3(display_gamma)); + vec4 diff = texture(diffuseRect, vary_fragcoord); + +#ifdef LEGACY_GAMMA + diff.rgb = linear_to_srgb(diff.rgb); + diff.rgb = legacyGamma(diff.rgb); +#else +#ifndef NO_POST + diff.rgb = toneMap(diff.rgb); +#endif diff.rgb = linear_to_srgb(diff.rgb); - frag_color = diff; +#endif + + vec2 tc = vary_fragcoord.xy*screen_res*4.0; + vec3 seed = (diff.rgb+vec3(1.0))*vec3(tc.xy, tc.x+tc.y); + vec3 nz = vec3(noise(seed.rg), noise(seed.gb), noise(seed.rb)); + diff.rgb += nz*0.003; + + frag_color = max(diff, vec4(0)); } |