mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-12-03 01:13:22 +00:00
119 lines
3.1 KiB
PostScript
119 lines
3.1 KiB
PostScript
sampler2D Image : register(s0);
|
|
sampler1D Palette : register(s1);
|
|
|
|
float4 Desaturation : register(c1); // { Desat, 1 - Desat }
|
|
float4 PaletteMod : register(c2);
|
|
float4 Weights : register(c6); // RGB->Gray weighting { 77/256.0, 143/256.0, 37/256.0, 1 }
|
|
float4 Gamma : register(c7);
|
|
|
|
float4 TextureLookup(float2 tex_coord)
|
|
{
|
|
#if PALTEX
|
|
float index = tex2D(Image, tex_coord).x;
|
|
index = index * PaletteMod.x + PaletteMod.y;
|
|
return tex1D(Palette, index);
|
|
#else
|
|
return tex2D(Image, tex_coord);
|
|
#endif
|
|
}
|
|
|
|
float4 Invert(float4 rgb)
|
|
{
|
|
#if INVERT
|
|
rgb.rgb = Weights.www - rgb.xyz;
|
|
#endif
|
|
return rgb;
|
|
}
|
|
|
|
float Grayscale(float4 rgb)
|
|
{
|
|
return dot(rgb.rgb, Weights.rgb);
|
|
}
|
|
|
|
float4 SampleTexture(float2 tex_coord)
|
|
{
|
|
return Invert(TextureLookup(tex_coord));
|
|
}
|
|
|
|
// Normal color calculation for most drawing modes.
|
|
|
|
float4 NormalColor(float2 tex_coord : TEXCOORD0, float4 VertexColor : COLOR0, float4 Overlay : COLOR1) : COLOR
|
|
{
|
|
return Overlay + SampleTexture(tex_coord) * VertexColor;
|
|
}
|
|
|
|
// Copy the red channel to the alpha channel. Pays no attention to palettes and only works with grayscale textures
|
|
|
|
float4 RedToAlpha(float2 tex_coord : TEXCOORD0, float4 VertexColor : COLOR0, float4 Overlay : COLOR1) : COLOR
|
|
{
|
|
float4 color = Invert(tex2D(Image, tex_coord));
|
|
color.a *= color.r;
|
|
return Overlay + color * VertexColor;
|
|
}
|
|
|
|
// Just return the value of c0.
|
|
|
|
float4 VertexColor(float4 color : COLOR0) : COLOR
|
|
{
|
|
return color;
|
|
}
|
|
|
|
// Emulate one of the special colormaps. (Invulnerability, gold, etc.)
|
|
|
|
float4 SpecialColormap(float2 tex_coord : TEXCOORD0, float4 start : COLOR0, float4 end : COLOR1) : COLOR
|
|
{
|
|
float4 color = SampleTexture(tex_coord);
|
|
float4 range = end - start;
|
|
// We can't store values greater than 1.0 in a color register, so we multiply
|
|
// the final result by 2 and expect the caller to divide the start and end by 2.
|
|
color.rgb = 2 * (start + Grayscale(color) * range).rgb;
|
|
// Duplicate alpha semantics of NormalColor.
|
|
color.a = start.a + color.a * end.a;
|
|
return color;
|
|
}
|
|
|
|
// In-game colormap effect: fade to a particular color and multiply by another, with
|
|
// optional desaturation of the original color. Desaturation is stored in c1.
|
|
// Fade level is packed int fade.a. Fade.rgb has been premultiplied by alpha.
|
|
// Overall alpha is in color.a.
|
|
float4 InGameColormap(float2 tex_coord : TEXCOORD0, float4 color : COLOR0, float4 fade : COLOR1) : COLOR
|
|
{
|
|
float4 rgb = SampleTexture(tex_coord);
|
|
|
|
// Desaturate
|
|
#if DESAT
|
|
float3 intensity;
|
|
intensity.rgb = Grayscale(rgb) * Desaturation.x;
|
|
rgb.rgb = intensity.rgb + rgb.rgb * Desaturation.y;
|
|
#endif
|
|
|
|
// Shade and Alpha
|
|
rgb = rgb * color;
|
|
|
|
// Fade
|
|
rgb.rgb = rgb.rgb * fade.aaa + fade.rgb;
|
|
|
|
return rgb;
|
|
}
|
|
|
|
// Windowed gamma correction.
|
|
|
|
float4 GammaCorrection(float2 tex_coord : TEXCOORD0) : COLOR
|
|
{
|
|
float4 color = tex2D(Image, tex_coord);
|
|
color.rgb = pow(color.rgb, Gamma.rgb);
|
|
return color;
|
|
}
|
|
|
|
// The burn wipe effect.
|
|
|
|
sampler2D NewScreen : register(s0);
|
|
sampler2D Burn : register(s1);
|
|
|
|
float4 BurnWipe(float2 coord[2] : TEXCOORD0) : COLOR
|
|
{
|
|
float4 color = tex2D(NewScreen, coord[0]);
|
|
float4 alpha = tex2D(Burn, coord[1]);
|
|
color.a = alpha.r * 2;
|
|
return color;
|
|
}
|