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Use gather for texture sampling

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Kovid Goyal
2026-07-01 08:56:29 +05:30
parent 5dc9b3a5ff
commit 149915c15c
2 changed files with 29 additions and 8 deletions
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34
kitty/shaders/screenshot.slang
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@@ -33,15 +33,35 @@ float3 safe_unpremult_to_linear(float4 s) {
}
[shader("fragment")]
float4 fragment_main(float2 tc : TEXCOORD, uniform float2 src_size) : SV_Target {
// Calculate the texel size
float4 fragment_main(float2 texcoord : TEXCOORD, uniform float2 src_size) : SV_Target {
float4 s00, s10, s01, s11;
float2 texel_size = 1.0 / src_size;
// Sample a 2x2 grid for better quality downscaling
float4 s00 = image.Sample(tc + float2(-0.25, -0.25) * texel_size);
float4 s10 = image.Sample(tc + float2( 0.25, -0.25) * texel_size);
float4 s01 = image.Sample(tc + float2(-0.25, 0.25) * texel_size);
float4 s11 = image.Sample(tc + float2( 0.25, 0.25) * texel_size);
// Use Slang target switches to dynamically compile for specific backend features
__target_switch
{
// Modern backends with full texture gathering capabilities
case spirv: case hlsl: case metal: {
float2 gather_coord = texcoord - (0.5 * texel_size);
float4 r_gather = image.GatherRed(gather_coord);
float4 g_gather = image.GatherGreen(gather_coord);
float4 b_gather = image.GatherBlue(gather_coord);
float4 a_gather = image.GatherAlpha(gather_coord);
s00 = float4(r_gather.w, g_gather.w, b_gather.w, a_gather.w); // Bottom-Left
s10 = float4(r_gather.z, g_gather.z, b_gather.z, a_gather.z); // Bottom-Right
s01 = float4(r_gather.x, g_gather.x, b_gather.x, a_gather.x); // Top-Left
s11 = float4(r_gather.y, g_gather.y, b_gather.y, a_gather.y); // Top-Right
}
// Fallback for older targets or legacy GLSL versions
default: {
s00 = image.Sample(texcoord + float2(-0.25, -0.25) * texel_size);
s10 = image.Sample(texcoord + float2( 0.25, -0.25) * texel_size);
s01 = image.Sample(texcoord + float2(-0.25, 0.25) * texel_size);
s11 = image.Sample(texcoord + float2( 0.25, 0.25) * texel_size);
}
}
// Unpremultiply and convert to linear for each sample
float3 linear00 = safe_unpremult_to_linear(s00);

3
kitty/shaders/slang.py
View File

@@ -268,7 +268,8 @@ def iter_entry_point_shaders(sources: dict[str, SlangFile], build_dir: str, dest
def commands_to_compile_to_spirv(sources: dict[str, SlangFile], build_dir: str, dest_dir: str, built_files: list[str]) -> Iterator[Command]:
base_cmd = ['-target', 'spirv', '-capability', 'vk_mem_model', '-fvk-use-entrypoint-name']
# glsl 450 is vulkan 1.1 and spirv 1.3 released 2008
base_cmd = ['-target', 'spirv', '-profile', 'glsl_450', '-capability', 'vk_mem_model', '-fvk-use-entrypoint-name']
for base_dest, slang_module, scmd, sfile in iter_entry_point_shaders(sources, build_dir, dest_dir):
for x in sfile.specializations:
cmd = list(scmd)