SmoothBilinear.fsh

git.y1.nz

SameBoy	Accurate GB/GBC emulator
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Shaders/SmoothBilinear.fsh

      1 STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
      2 {
      3     vec2 pixel = position * input_resolution - vec2(0.5, 0.5);
      4 
      5     vec4 q11 = texture(image, (floor(pixel) + 0.5) / input_resolution);
      6     vec4 q12 = texture(image, (vec2(floor(pixel.x), ceil(pixel.y)) + 0.5) / input_resolution);
      7     vec4 q21 = texture(image, (vec2(ceil(pixel.x), floor(pixel.y)) + 0.5) / input_resolution);
      8     vec4 q22 = texture(image, (ceil(pixel) + 0.5) / input_resolution);
      9 
     10     vec2 s = smoothstep(0., 1., fract(pixel));
     11 
     12     vec4 r1 = mix(q11, q21, s.x);
     13     vec4 r2 = mix(q12, q22, s.x);
     14 
     15     return mix (r1, r2, s.y);
     16 }

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SameBoy