mirrors/wlroots
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/wlroots/wlroots.git synced 2025-11-01 22:58:38 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

render/vulkan: add lut3d output shader option

Browse source 
While a corresponding pipeline is created, it is not yet used.
This commit is contained in:
Manuel Stoeckl 2024-01-06 21:15:12 -05:00 • committed by Simon Ser
parent c64144a39b
commit adbfd3c321
4 changed files with 57 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

28
render/vulkan/shaders/output.frag
View file

@ -1,6 +1,6 @@
#version 450
layout (input_attachment_index = 0, binding = 0) uniform subpassInput in_color;
layout (input_attachment_index = 0, set = 0, binding = 0) uniform subpassInput in_color;
layout(set = 1, binding = 0) uniform sampler3D lut_3d;
@ -13,6 +13,12 @@ layout(push_constant) uniform UBO {
float lut_3d_scale;
} data;
layout (constant_id = 0) const int OUTPUT_TRANSFORM = 0;
// Matches enum wlr_vk_output_transform
#define OUTPUT_TRANSFORM_INVERSE_SRGB 0
#define OUTPUT_TRANSFORM_LUT_3D 1
float linear_channel_to_srgb(float x) {
return max(min(x * 12.92, 0.04045), 1.055 * pow(x, 1. / 2.4) - 0.055);
}
@ -33,10 +39,22 @@ vec4 linear_color_to_srgb(vec4 color) {
void main() {
vec4 val = subpassLoad(in_color).rgba;
if (OUTPUT_TRANSFORM == OUTPUT_TRANSFORM_LUT_3D) {
if (val.a == 0) {
out_color = vec4(0);
return;
}
// Convert from pre-multiplied alpha to straight alpha
vec3 rgb = val.rgb / val.a;
// temporary code to use the 3d look up table; to be dropped next commit
vec3 pos = data.lut_3d_offset + vec3(0.5,0.5,0.5) * data.lut_3d_scale;
val.rgb *= texture(lut_3d, pos).rgb;
// Apply 3D LUT
vec3 pos = data.lut_3d_offset + rgb * data.lut_3d_scale;
rgb = texture(lut_3d, pos).rgb;
out_color = linear_color_to_srgb(val);
// Back to pre-multiplied alpha
out_color = vec4(rgb * val.a, val.a);
} else { // OUTPUT_TRANSFORM_INVERSE_SRGB
// Produce post-premultiplied sRGB encoded values
out_color = linear_color_to_srgb(val);
}
}