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c/shaders: Use fma in compute shader

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Simon Zeni 2023-10-23 21:18:59 -04:00 committed by Jakob Bornecrantz
parent c4251cb907
commit ec26005952
1 changed files with 6 additions and 6 deletions
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12
src/xrt/compositor/shaders/layer.comp
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@ -81,7 +81,7 @@ vec2 transform_uv_subimage(vec2 uv, uint layer)
vec2 values = uv;
// To deal with OpenGL flip and sub image view.
values.xy = values.xy * ubo.post_transform[layer].zw + ubo.post_transform[layer].xy;
values.xy = fma(values.xy, ubo.post_transform[layer].zw, ubo.post_transform[layer].xy);
// Ready to be used.
return values.xy;
@ -92,7 +92,7 @@ vec2 transform_uv_timewarp(vec2 uv, uint layer)
vec4 values = vec4(uv, -1, 1);
// From uv to tan angle (tangent space).
values.xy = values.xy * ubo.pre_transform.zw + ubo.pre_transform.xy;
values.xy = fma(values.xy, ubo.pre_transform.zw, ubo.pre_transform.xy);
values.y = -values.y; // Flip to OpenXR coordinate system.
// Timewarp.
@ -103,7 +103,7 @@ vec2 transform_uv_timewarp(vec2 uv, uint layer)
values.xy = values.xy * 0.5 + 0.5;
// To deal with OpenGL flip and sub image view.
values.xy = values.xy * ubo.post_transform[layer].zw + ubo.post_transform[layer].xy;
values.xy = fma(values.xy, ubo.post_transform[layer].zw, ubo.post_transform[layer].xy);
// Done.
return values.xy;
@ -137,7 +137,7 @@ vec3 get_direction(vec2 uv)
vec4 values = vec4(uv, -1, 1);
// From uv to tan angle (tangent space).
values.xy = values.xy * ubo.pre_transform.zw + ubo.pre_transform.xy;
values.xy = fma(values.xy, ubo.pre_transform.zw, ubo.pre_transform.xy);
values.y = -values.y; // Flip to OpenXR coordinate system.
// This works because values.xy are now in tangent space, that is the
@ -213,7 +213,7 @@ vec4 do_quad(vec2 view_uv, uint layer)
vec2 plane_uv = (intersection_ps.xy + ubo.quad_extent[layer] / 2.) / ubo.quad_extent[layer];
// sample on the desired subimage, not the entire texture
plane_uv = plane_uv * ubo.post_transform[layer].zw + ubo.post_transform[layer].xy;
plane_uv = fma(plane_uv, ubo.post_transform[layer].zw, ubo.post_transform[layer].xy);
colour = texture(source[source_image_index], plane_uv);
} else {
@ -256,7 +256,7 @@ vec4 do_layers(vec2 view_uv)
// Premultiplied blend factor of 1.
accum.rgb = (accum.rgb * (1 - rgba.a)) + rgba.rgb;
}
accum.a = rgba.a + accum.a * (1.0 - rgba.a);
accum.a = fma((1.f - rgba.a), accum.a, rgba.a);
}
return accum;