SameBoy/Shaders/MasterShader.fsh

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#version 150
uniform sampler2D image;
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uniform sampler2D previous_image;
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uniform int frame_blending_mode;
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uniform vec2 output_resolution;
uniform vec2 origin;
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#define equal(x, y) ((x) == (y))
#define inequal(x, y) ((x) != (y))
#define STATIC
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#define GAMMA (2.2)
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out vec4 frag_color;
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vec4 _texture(sampler2D t, vec2 pos)
{
return pow(texture(t, pos), vec4(GAMMA));
}
#define texture _texture
#line 1
{filter}
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#define BLEND_BIAS (2.0/5.0)
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#define DISABLED 0
#define SIMPLE 1
#define ACCURATE 2
#define ACCURATE_EVEN ACCURATE
#define ACCURATE_ODD 3
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void main()
{
vec2 position = gl_FragCoord.xy - origin;
position /= output_resolution;
position.y = 1 - position.y;
vec2 input_resolution = textureSize(image, 0);
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float ratio;
switch (frame_blending_mode) {
default:
case DISABLED:
frag_color = scale(image, position, input_resolution, output_resolution);
return;
case SIMPLE:
ratio = 0.5;
break;
case ACCURATE_EVEN:
if ((int(position.y * input_resolution.y) & 1) == 0) {
ratio = BLEND_BIAS;
}
else {
ratio = 1 - BLEND_BIAS;
}
break;
case ACCURATE_ODD:
if ((int(position.y * input_resolution.y) & 1) == 0) {
ratio = 1 - BLEND_BIAS;
}
else {
ratio = BLEND_BIAS;
}
break;
}
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frag_color = pow(mix(scale(image, position, input_resolution, output_resolution),
scale(previous_image, position, input_resolution, output_resolution), ratio), vec4(1.0 / GAMMA));
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}