092affc573
The referenced commit introduced the use of gamma 2.2 or piecewise sRGB
for the backbuffer blit depending on the operating system. This commit
switches from a push constant for this to a preprocessor define.
Ref 5d72498154
Pull Request: https://projects.blender.org/blender/blender/pulls/146170
43 lines
1.2 KiB
GLSL
43 lines
1.2 KiB
GLSL
/* SPDX-FileCopyrightText: 2025 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "vk_backbuffer_blit_info.hh"
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COMPUTE_SHADER_CREATE_INFO(vk_backbuffer_blit)
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float srgb_to_linearrgb(float c)
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{
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if (c < 0.04045f) {
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return (c < 0.0f) ? 0.0f : c * (1.0f / 12.92f);
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}
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return pow((c + 0.055f) * (1.0f / 1.055f), 2.4f);
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}
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vec3 nonlinear_to_linear_scrgb(vec3 c)
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{
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#ifdef USE_GAMMA22
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return pow(c, vec3(2.2f));
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#else
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return vec3(srgb_to_linearrgb(c.r), srgb_to_linearrgb(c.g), srgb_to_linearrgb(c.b));
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#endif
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}
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void main()
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{
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ivec2 dst_texel = ivec2(gl_GlobalInvocationID.xy);
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ivec2 src_size = ivec2(imageSize(src_img));
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ivec2 src_texel = ivec2(dst_texel.x, src_size.y - dst_texel.y - 1);
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vec4 color = imageLoad(src_img, ivec2(src_texel));
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/*
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* Convert from extended sRGB non-linear to linear.
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*
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* Preserves negative wide gamut values with sign/abs. May use either gamma 2.2
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* decode to match most SDR sRGB displays, or the piecewise sRGB function to
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* match Windows SDR applications in HDR node.
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*/
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color.rgb = sign(color.rgb) * nonlinear_to_linear_scrgb(abs(color.rgb)) * sdr_scale;
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imageStore(dst_img, ivec2(dst_texel), color);
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}
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