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[dxvk] Improve swapchain scaling

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This commit is contained in:
Philip Rebohle 2025-03-08 22:09:04 +01:00
parent 1b529c711c
commit 851e96f83a
1 changed files with 23 additions and 1 deletions
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24
src/dxvk/shaders/dxvk_present_frag_blit.frag
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@ -9,7 +9,29 @@ layout(location = 0) out vec4 o_color;
void main() {
vec2 coord = vec2(src_offset) + vec2(src_extent) * i_coord;
o_color = input_to_sc_rgb(textureLod(s_image, coord, 0.0f));
vec2 delta = vec2(dFdx(coord.x), dFdy(coord.y));
ivec2 i_coord = ivec2(coord);
vec2 f_coord = fract(coord);
if (all(lessThan(delta, vec2(1.0f)))) {
// Map pixel rectangle to source image. If it is entirely contained within one
// source pixel, just sample that pixel, otherwise do a linear interpolation.
// For even scaling factors, this is essentially integer scaling.
vec2 lo = max(coord - 0.5f * delta, vec2(src_offset));
vec2 hi = min(coord + 0.5f * delta, vec2(src_offset + src_extent - 1));
i_coord = ivec2(lo);
f_coord = mix((hi - floor(hi)) / delta, vec2(0.0), equal(floor(lo), floor(hi)));
}
// Manually interpolate in the correct color space
o_color = mix(mix(input_to_sc_rgb(texelFetch(s_image, i_coord + ivec2(0, 0), 0)),
input_to_sc_rgb(texelFetch(s_image, i_coord + ivec2(1, 0), 0)), f_coord.x),
mix(input_to_sc_rgb(texelFetch(s_image, i_coord + ivec2(0, 1), 0)),
input_to_sc_rgb(texelFetch(s_image, i_coord + ivec2(1, 1), 0)), f_coord.x),
f_coord.y);
o_color = composite_image(o_color);
o_color = sc_rgb_to_output(o_color);
}