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fix(linux/vulkan): preserve host aspect ratio in encoder output (#5130)

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Bo He
2026-05-27 10:55:39 +08:00
committed by GitHub
parent 87182c9ef9
commit 3c7952b2dd
2 changed files with 42 additions and 9 deletions
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src_assets/linux/assets/shaders/vulkan/rgb2yuv.comp
+19 -3
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@@ -15,7 +15,9 @@ layout(push_constant) uniform PushConstants {
vec2 range_uv;
ivec2 src_offset;
ivec2 src_size;
ivec2 dst_size;
ivec2 dst_offset; // top-left of the aspect-preserved viewport
ivec2 dst_size; // effective viewport (src after aspect-fit)
ivec2 dst_full_size; // full encoder frame size
ivec2 cursor_pos;
ivec2 cursor_size; // w=0 means no cursor
int y_invert;
@@ -32,13 +34,27 @@ vec3 blend_cursor(vec3 rgb, ivec2 pos) {
void main() {
ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
if (pos.x >= pc.dst_size.x || pos.y >= pc.dst_size.y)
if (pos.x >= pc.dst_full_size.x || pos.y >= pc.dst_full_size.y)
return;
ivec2 d = pos - pc.dst_offset;
if (d.x < 0 || d.y < 0 || d.x >= pc.dst_size.x || d.y >= pc.dst_size.y) {
// Outside the aspect-fit viewport: write encoded black.
// Use the same conversion formula as RGB=(0,0,0), where the dot product
// is zero and the encoded value is color_vec_*.w adjusted by range_*.
float y_black = pc.color_vec_y.w * pc.range_y.x + pc.range_y.y;
float u_black = pc.color_vec_u.w * pc.range_uv.x + pc.range_uv.y;
float v_black = pc.color_vec_v.w * pc.range_uv.x + pc.range_uv.y;
imageStore(y_out, pos, vec4(y_black, 0, 0, 0));
if ((pos.x & 1) == 0 && (pos.y & 1) == 0)
imageStore(uv_out, pos >> 1, vec4(u_black, v_black, 0, 0));
return;
}
vec2 inv_tex = 1.0 / vec2(textureSize(rgb_in, 0));
vec2 scale = vec2(pc.src_size) / vec2(pc.dst_size);
vec2 uv = (vec2(pc.src_offset) + (vec2(pos) + 0.5) * scale) * inv_tex;
vec2 uv = (vec2(pc.src_offset) + (vec2(d) + 0.5) * scale) * inv_tex;
if (pc.y_invert != 0)
uv.y = 1.0 - uv.y;
vec3 rgb = texture(rgb_in, uv).rgb;