diff options
Diffstat (limited to 'drivers/gles3/shaders')
| -rw-r--r-- | drivers/gles3/shaders/tonemap.glsl | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/drivers/gles3/shaders/tonemap.glsl b/drivers/gles3/shaders/tonemap.glsl index 56876bdb72..7385b2cd2d 100644 --- a/drivers/gles3/shaders/tonemap.glsl +++ b/drivers/gles3/shaders/tonemap.glsl @@ -122,13 +122,16 @@ vec4 texture2D_bicubic(sampler2D tex, vec2 uv, int p_lod) { #endif vec3 tonemap_filmic(vec3 color, float white) { - const float A = 0.15f; - const float B = 0.50f; + // exposure bias: input scale (color *= bias, white *= bias) to make the brighness consistent with other tonemappers + // also useful to scale the input to the range that the tonemapper is designed for (some require very high input values) + // has no effect on the curve's general shape or visual properties + const float exposure_bias = 2.0f; + const float A = 0.22f * exposure_bias * exposure_bias; // bias baked into constants for performance + const float B = 0.30f * exposure_bias; const float C = 0.10f; const float D = 0.20f; - const float E = 0.02f; + const float E = 0.01f; const float F = 0.30f; - const float W = 11.2f; vec3 color_tonemapped = ((color * (A * color + C * B) + D * E) / (color * (A * color + B) + D * F)) - E / F; float white_tonemapped = ((white * (A * white + C * B) + D * E) / (white * (A * white + B) + D * F)) - E / F; @@ -137,10 +140,11 @@ vec3 tonemap_filmic(vec3 color, float white) { } vec3 tonemap_aces(vec3 color, float white) { - const float A = 2.51f; - const float B = 0.03f; - const float C = 2.43f; - const float D = 0.59f; + const float exposure_bias = 0.85f; + const float A = 2.51f * exposure_bias * exposure_bias; + const float B = 0.03f * exposure_bias; + const float C = 2.43f * exposure_bias * exposure_bias; + const float D = 0.59f * exposure_bias; const float E = 0.14f; vec3 color_tonemapped = (color * (A * color + B)) / (color * (C * color + D) + E); @@ -149,8 +153,8 @@ vec3 tonemap_aces(vec3 color, float white) { return clamp(color_tonemapped / white_tonemapped, vec3(0.0f), vec3(1.0f)); } -vec3 tonemap_reindhart(vec3 color, float white) { - return clamp((color) / (1.0f + color) * (1.0f + (color / (white))), vec3(0.0f), vec3(1.0f)); // whitepoint is probably not in linear space here! +vec3 tonemap_reinhard(vec3 color, float white) { + return clamp((white * color + color) / (color * white + white), vec3(0.0f), vec3(1.0f)); } vec3 linear_to_srgb(vec3 color) { // convert linear rgb to srgb, assumes clamped input in range [0;1] @@ -159,8 +163,8 @@ vec3 linear_to_srgb(vec3 color) { // convert linear rgb to srgb, assumes clamped } vec3 apply_tonemapping(vec3 color, float white) { // inputs are LINEAR, always outputs clamped [0;1] color -#ifdef USE_REINDHART_TONEMAPPER - return tonemap_reindhart(color, white); +#ifdef USE_REINHARD_TONEMAPPER + return tonemap_reinhard(color, white); #endif #ifdef USE_FILMIC_TONEMAPPER |