Add Chromium-only Blender WebEngine parity work

blender-5.2.0/source/blender/gpu/vulkan/shaders/vk_backbuffer_blit_comp.glsl

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+/* SPDX-FileCopyrightText: 2025 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "vk_backbuffer_blit_infos.hh"
+
+COMPUTE_SHADER_CREATE_INFO(vk_backbuffer_blit)
+
+float srgb_to_linearrgb(float c)
+{
+  if (c < 0.04045f) {
+    return (c < 0.0f) ? 0.0f : c * (1.0f / 12.92f);
+  }
+
+  return pow((c + 0.055f) * (1.0f / 1.055f), 2.4f);
+}
+
+float3 nonlinear_to_linear_scrgb(float3 c)
+{
+#ifdef USE_GAMMA22
+  return pow(c, float3(2.2f));
+#else
+  return float3(srgb_to_linearrgb(c.r), srgb_to_linearrgb(c.g), srgb_to_linearrgb(c.b));
+#endif
+}
+
+void main()
+{
+  int2 dst_texel = int2(gl_GlobalInvocationID.xy);
+  int2 src_size = int2(imageSize(src_img));
+  int2 src_texel = int2(dst_texel.x, src_size.y - dst_texel.y - 1);
+  float4 color = imageLoad(src_img, int2(src_texel));
+  /*
+   * Convert from extended sRGB non-linear to linear.
+   *
+   * Preserves negative wide gamut values with sign/abs. May use either gamma 2.2
+   * decode to match most SDR sRGB displays, or the piecewise sRGB function to
+   * match Windows SDR applications in HDR node.
+   */
+  color.rgb = sign(color.rgb) * nonlinear_to_linear_scrgb(abs(color.rgb)) * sdr_scale;
+  imageStore(dst_img, int2(dst_texel), color);
+}

blender-5.2.0/source/blender/gpu/vulkan/shaders/vk_backbuffer_blit_infos.hh

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+/* SPDX-FileCopyrightText: 2025 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifdef GPU_SHADER
+#  pragma once
+#endif
+
+#include "gpu_shader_create_info.hh"
+
+GPU_SHADER_CREATE_INFO(vk_backbuffer_blit)
+LOCAL_GROUP_SIZE(16, 16)
+IMAGE(0, SFLOAT_16_16_16_16, read, Float2D, src_img)
+IMAGE(1, SFLOAT_16_16_16_16, write, Float2D, dst_img)
+PUSH_CONSTANT(float, sdr_scale)
+PUSH_CONSTANT(bool, use_gamma22)
+COMPUTE_SOURCE("vk_backbuffer_blit_comp.glsl")
+ADDITIONAL_INFO(gpu_srgb_to_framebuffer_space)
+DO_STATIC_COMPILATION()
+GPU_SHADER_CREATE_END()
+
+GPU_SHADER_CREATE_INFO(vk_backbuffer_blit_gamma22)
+ADDITIONAL_INFO(vk_backbuffer_blit)
+DEFINE("USE_GAMMA22")
+DO_STATIC_COMPILATION()
+GPU_SHADER_CREATE_END()