5d72498154
See the code comments for detailed explanation. But overall we use particular combinations of sRGB and gamma 2.2 encode/decode to match SDR applications while still ensuring HDR values are passed on linearly. This means the user interface and SDR content will display different in Windows HDR mode off and on, but that is consistent with other applications. Split use_hdr variable into use_hdr_buffer about the graphics buffer, and use_hdr_display about the chosen display in Blender. Ref #145022 Pull Request: https://projects.blender.org/blender/blender/pulls/145025
44 lines
1.2 KiB
GLSL
44 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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if (use_gamma22) {
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return pow(c, vec3(2.2f));
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}
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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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}
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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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