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Pixels, mhhhm

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This commit is contained in:
Themaister 2010-11-13 01:56:02 +01:00
parent 8eef955a48
commit daa0e611a6
2 changed files with 38 additions and 1 deletions
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2
config.h
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@ -65,7 +65,7 @@ static const bool vsync = true;
static const bool video_smooth = false;
// Path to custom Cg shader. If using custom shaders, it is recommended to disable video_smooth and VIDEO_FILTER.
static const char *cg_shader_path = "hqflt/crt.cg";
static const char *cg_shader_path = "hqflt/pixellate.cg";
// On resize and fullscreen, rendering area will stay 4:3
static const bool force_aspect = true;

37
hqflt/pixellate.cg Executable file
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@ -0,0 +1,37 @@
struct output
{
float4 color : COLOR;
};
output main(uniform sampler2D rubyTexture : TEXUNIT0, float2 gl_TexCoord : TEXCOORD0) {
float2 rubyTextureSize = float2(256.0, 224.0);
float2 texelSize = 1.0 / rubyTextureSize;
float2 range;
range.x = dFdx(gl_TexCoord.x) / 2.0 * 0.99;
range.y = dFdy(gl_TexCoord.y) / 2.0 * 0.99;
float left = gl_TexCoord.x - range.x;
float top = gl_TexCoord.y + range.y;
float right = gl_TexCoord.x + range.x;
float bottom = gl_TexCoord.y - range.y;
float4 topLeftColor = tex2D(rubyTexture, (floor(float2(left, top) / texelSize) + 0.5) * texelSize);
float4 bottomRightColor = tex2D(rubyTexture, (floor(float2(right, bottom) / texelSize) + 0.5) * texelSize);
float4 bottomLeftColor = tex2D(rubyTexture, (floor(float2(left, bottom) / texelSize) + 0.5) * texelSize);
float4 topRightColor = tex2D(rubyTexture, (floor(float2(right, top) / texelSize) + 0.5) * texelSize);
float2 border = clamp(round(gl_TexCoord / texelSize) * texelSize, float2(left, bottom), float2(right, top));
float totalArea = 4.0 * range.x * range.y;
float4 averageColor;
averageColor = ((border.x - left) * (top - border.y) / totalArea) * topLeftColor;
averageColor += ((right - border.x) * (border.y - bottom) / totalArea) * bottomRightColor;
averageColor += ((border.x - left) * (border.y - bottom) / totalArea) * bottomLeftColor;
averageColor += ((right - border.x) * (top - border.y) / totalArea) * topRightColor;
output OUT;
OUT.color = averageColor;
return OUT;
}