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add default auto-pre-scale to sharp-bilinear

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hizzlekizzle 2016-12-30 08:28:09 -06:00 committed by GitHub
parent 6918720885
commit 4aa0679176
1 changed files with 12 additions and 9 deletions
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21
retro/shaders/sharp-bilinear.slang
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@ -2,15 +2,19 @@
layout(push_constant) uniform Push
{
vec4 OutputSize;
vec4 OriginalSize;
vec4 SourceSize;
float SHARP_BILINEAR_PRE_SCALE;
} param;
float AUTO_PRESCALE;
} params;
#pragma parameter SHARP_BILINEAR_PRE_SCALE "Sharp Bilinear Prescale" 4.0 1.0 10.0 1.0
#pragma parameter AUTO_PRESCALE "Automatic Prescale" 1.0 0.0 1.0 1.0
layout(std140, set = 0, binding = 0) uniform UBO
{
mat4 MVP;
vec4 OutputSize;
vec4 OriginalSize;
vec4 SourceSize;
} global;
/*
@ -22,8 +26,6 @@ layout(std140, set = 0, binding = 0) uniform UBO
* sharper image than plain bilinear.
*/
#pragma parameter SHARP_BILINEAR_PRE_SCALE "Sharp Bilinear Prescale" 4.0 1.0 10.0 1.0
#pragma stage vertex
layout(location = 0) in vec4 Position;
layout(location = 1) in vec2 TexCoord;
@ -45,15 +47,16 @@ void main()
vec2 texel = vTexCoord * global.SourceSize.xy;
vec2 texel_floored = floor(texel);
vec2 s = fract(texel);
float region_range = 0.5 - 0.5 / param.SHARP_BILINEAR_PRE_SCALE;
float scale = (AUTO_PRESCALE > 0.5) ? floor(params.OutputSize.y / params.SourceSize.y) : params.SHARP_BILINEAR_PRE_SCALE;
float region_range = 0.5 - 0.5 / scale;
// Figure out where in the texel to sample to get correct pre-scaled bilinear.
// Uses the hardware bilinear interpolator to avoid having to sample 4 times manually.
vec2 center_dist = s - 0.5;
vec2 f = (center_dist - clamp(center_dist, -region_range, region_range)) * param.SHARP_BILINEAR_PRE_SCALE + 0.5;
vec2 f = (center_dist - clamp(center_dist, -region_range, region_range)) * scale + 0.5;
vec2 mod_texel = texel_floored + f;
FragColor = vec4(texture(Source, mod_texel / global.SourceSize.xy).rgb, 1.0);
}
}