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gpu: Add shaders for the new specialization constant

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This adds the following functions:

output_color_from_alt()
alt_color_from_output()
  Converts between the two colors

output_color_alpha()
alt_color_alpha()
  Multiplies a color with an alpha value
This commit is contained in:
Benjamin Otte 2024-07-03 07:45:48 +02:00
parent 6c5ae48a05
commit 91d970e9c5
2 changed files with 127 additions and 18 deletions
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127
gsk/gpu/shaders/color.glsl
View File

@ -1,6 +1,17 @@
#ifndef _COLOR_
#define _COLOR_
#define COLOR_SPACE_OUTPUT_PREMULTIPLIED (1u << 2)
#define COLOR_SPACE_ALT_PREMULTIPLIED (1u << 3)
#define COLOR_SPACE_OUTPUT_SHIFT 8u
#define COLOR_SPACE_ALT_SHIFT 16u
#define COLOR_SPACE_COLOR_STATE_MASK 0xFFu
#define OUTPUT_COLOR_SPACE ((GSK_COLOR_STATES >> COLOR_SPACE_OUTPUT_SHIFT) & COLOR_SPACE_COLOR_STATE_MASK)
#define ALT_COLOR_SPACE ((GSK_COLOR_STATES >> COLOR_SPACE_ALT_SHIFT) & COLOR_SPACE_COLOR_STATE_MASK)
#define OUTPUT_PREMULTIPLIED ((GSK_COLOR_STATES & COLOR_SPACE_OUTPUT_PREMULTIPLIED) == COLOR_SPACE_OUTPUT_PREMULTIPLIED)
#define ALT_PREMULTIPLIED ((GSK_COLOR_STATES & COLOR_SPACE_ALT_PREMULTIPLIED) == COLOR_SPACE_ALT_PREMULTIPLIED)
vec4
color_premultiply (vec4 color)
{
@ -13,6 +24,122 @@ color_unpremultiply (vec4 color)
return color.a > 0.0 ? color / vec4 (color.aaa, 1.0) : color;
}
float
srgb_eotf (float v)
{
if (v >= 0.04045)
return pow (((v + 0.055) / (1.0 + 0.055)), 2.4);
else
return v / 12.92;
}
float
srgb_oetf (float v)
{
if (v > 0.0031308)
return 1.055 * pow (v, 1.0 / 2.4) - 0.055;
else
return 12.92 * v;
}
vec4
alt_color_alpha (vec4 color,
float alpha)
{
if (ALT_PREMULTIPLIED)
return color * alpha;
else
return vec4 (color.rgb, color.a * alpha);
}
vec4
output_color_alpha (vec4 color,
float alpha)
{
if (OUTPUT_PREMULTIPLIED)
return color * alpha;
else
return vec4 (color.rgb, color.a * alpha);
}
vec4
alt_color_from_output (vec4 color)
{
if (OUTPUT_COLOR_SPACE == ALT_COLOR_SPACE)
{
if (OUTPUT_PREMULTIPLIED && !ALT_PREMULTIPLIED)
return color_unpremultiply (color);
else if (!OUTPUT_PREMULTIPLIED && ALT_PREMULTIPLIED)
return color_premultiply (color);
else
return color;
}
if (OUTPUT_PREMULTIPLIED)
color = color_unpremultiply (color);
if (OUTPUT_COLOR_SPACE == GDK_COLOR_STATE_ID_SRGB &&
ALT_COLOR_SPACE == GDK_COLOR_STATE_ID_SRGB_LINEAR)
{
color = vec4 (srgb_eotf (color.r),
srgb_eotf (color.g),
srgb_eotf (color.b),
color.a);
}
else if (OUTPUT_COLOR_SPACE == GDK_COLOR_STATE_ID_SRGB_LINEAR &&
ALT_COLOR_SPACE == GDK_COLOR_STATE_ID_SRGB)
{
color = vec4 (srgb_oetf (color.r),
srgb_oetf (color.g),
srgb_oetf (color.b),
color.a);
}
if (ALT_PREMULTIPLIED)
color = color_premultiply (color);
return color;
}
vec4
output_color_from_alt (vec4 color)
{
if (OUTPUT_COLOR_SPACE == ALT_COLOR_SPACE)
{
if (ALT_PREMULTIPLIED && !OUTPUT_PREMULTIPLIED)
return color_unpremultiply (color);
else if (!ALT_PREMULTIPLIED && OUTPUT_PREMULTIPLIED)
return color_premultiply (color);
else
return color;
}
if (ALT_PREMULTIPLIED)
color = color_unpremultiply (color);
if (ALT_COLOR_SPACE == GDK_COLOR_STATE_ID_SRGB &&
OUTPUT_COLOR_SPACE == GDK_COLOR_STATE_ID_SRGB_LINEAR)
{
color = vec4 (srgb_eotf (color.r),
srgb_eotf (color.g),
srgb_eotf (color.b),
color.a);
}
else if (ALT_COLOR_SPACE == GDK_COLOR_STATE_ID_SRGB_LINEAR &&
OUTPUT_COLOR_SPACE == GDK_COLOR_STATE_ID_SRGB)
{
color = vec4 (srgb_oetf (color.r),
srgb_oetf (color.g),
srgb_oetf (color.b),
color.a);
}
if (OUTPUT_PREMULTIPLIED)
color = color_premultiply (color);
return color;
}
float
luminance (vec3 color)
{

18
gsk/gpu/shaders/gskgpuconvert.glsl
View File

@ -13,24 +13,6 @@
#define SOURCE_COLOR_STATE ((GSK_VARIATION >> VARIATION_SOURCE_SHIFT) & VARIATION_COLOR_STATE_MASK)
#define TARGET_COLOR_STATE ((GSK_VARIATION >> VARIATION_TARGET_SHIFT) & VARIATION_COLOR_STATE_MASK)
float
srgb_eotf (float v)
{
if (v >= 0.04045)
return pow (((v + 0.055) / (1.0 + 0.055)), 2.4);
else
return v / 12.92;
}
float
srgb_oetf (float v)
{
if (v > 0.0031308)
return 1.055 * pow (v, 1.0 / 2.4) - 0.055;
else
return 12.92 * v;
}
vec4
srgb_to_linear_srgb (vec4 color)
{