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Wire up the backbuffer sampler

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Kovid Goyal 2026-07-27 23:11:43 +05:30
parent 8df49c2b45
commit 7e6cd36d26
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GPG key ID: 06BC317B515ACE7C
3 changed files with 39 additions and 22 deletions
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56
kitty/shaders/custom/pipeline.slang
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@ -4,37 +4,53 @@
// IMPORTS
static const int LEFT = 0;
static const int TOP = 1;
static const int RIGHT = 2;
static const int BOTTOM = 3;
static const uint FF = 0xff;
static const uint2 pos_map[4] = {
uint2(RIGHT, TOP),
uint2(RIGHT, BOTTOM),
uint2(LEFT, BOTTOM),
uint2(LEFT, TOP)
public struct BlitOutput {
public float2 texcoord;
public float2 position;
};
#define left 0
#define top 1
#define right 2
#define bottom 3
// Static constant array mapping vertex IDs
static const int2 vertex_pos_map[4] = {
{right, top},
{right, bottom},
{left, bottom},
{left, top}
};
public BlitOutput get_coords_for_blit(uint vertex_id, float4 src_rect, float4 dest_rect) {
int2 pos = vertex_pos_map[vertex_id];
BlitOutput output;
output.texcoord = float2(src_rect[pos.x], src_rect[pos.y]);
output.position = float2(dest_rect[pos.x], dest_rect[pos.y]);
return output;
}
struct VertexOutput {
float2 texcoord : TEXCOORD;
float4 position : SV_Position;
KittyCustomShaderData d;
};
[shader("vertex")]
VertexOutput vertex_main(float4 rect, uint vertex_id : SV_VertexID) {
uint2 pos = pos_map[vertex_id];
VertexOutput vo;
vo.position = float4(rect[pos.x], rect[pos.y], 0, 1);
return vo;
VertexOutput vertex_main(float4 src_rect, float4 dest_rect, uint vertex_id : SV_VertexID) {
BlitOutput ans = get_coords_for_blit(vertex_id, src_rect, dest_rect);
return {ans.texcoord, float4(ans.position[0], ans.position[1], 0.0, 1.0)};
}
uniform Sampler2D backbuffer;
[shader("fragment")]
float4 pipeline_fragment_main(VertexOutput vo) : SV_Target {
vo.d.pos = vo.position;
float4 color = float4(1, 1, 1, 1); // TODO: load from framebuffer
float4 pipeline_fragment_main(float2 texcoord : TEXCOORD) : SV_Target {
KittyCustomShaderData d;
d.backbuffer = backbuffer;
d.texcoord = texcoord;
d.backbuffer = backbuffer;
float4 color = backbuffer.Sample(texcoord);
// PIPELINE
return color;
}

3
kitty/shaders/custom/types.slang
View file

@ -6,5 +6,6 @@
public struct KittyCustomShaderData {
public uint timestamp;
public float4 pos;
public float2 texcoord;
public Sampler2D backbuffer;
}

2
kitty/shaders/slang.py
View file

@ -968,7 +968,7 @@ def build_custom_shader_pipeline_ir(slot: str = 'after-window-background', shade
entry_points.append(entry_point)
mod_src = get_custom_shader_src('pipeline').decode()
mod_src = mod_src.replace('// IMPORTS', '\n'.join(f'__include "{w}";' for w in wrappers), 1)
mod_src = mod_src.replace('// PIPELINE', '\n'.join(f'color = {w}(color, vo.d);' for w in entry_points), 1)
mod_src = mod_src.replace('// PIPELINE', '\n'.join(f'color = {w}(color, d);' for w in entry_points), 1)
# subprocess.run(['bat', '-P', '-l', 'cpp'], input=mod_src.encode())
slot_key = key(slot, mod_src, shaders_content_key)