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https://github.com/ZDoom/gzdoom.git
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da31d9f8a3
Mobility Radeon 9000 (on a PCI card, no less!), I have decided to give the PS14 support some loving: D3D windowed gamma now works on these cards using a texture lookup for the gamma table. Sadly, this halves my framerate, so setting gamma to 1 will skip the gamma correction, as it was before, for full speed. (On my 8800 GT, the gamma correction was free.) SVN r1898 (trunk)
135 lines
3.7 KiB
PostScript
135 lines
3.7 KiB
PostScript
sampler2D Image : register(s0);
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sampler1D Palette : register(s1);
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#if PS14
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sampler1D Gamma1 : register(s2);
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sampler1D Gamma2 : register(s3);
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sampler1D Gamma3 : register(s4);
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#endif
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float4 PaletteMod : register(c2);
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float4 Weights : register(c6); // RGB->Gray weighting { 77/256.0, 143/256.0, 37/256.0, 1 }
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float4 Gamma : register(c7);
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float4 TextureLookup(float2 tex_coord)
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{
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#if PALTEX
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float index = tex2D(Image, tex_coord).x;
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index = index * PaletteMod.x + PaletteMod.y;
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return tex1D(Palette, index);
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#else
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return tex2D(Image, tex_coord);
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#endif
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}
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float4 Invert(float4 rgb)
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{
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#if INVERT
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rgb.rgb = Weights.www - rgb.xyz;
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#endif
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return rgb;
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}
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float Grayscale(float4 rgb)
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{
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return dot(rgb.rgb, Weights.rgb);
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}
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float4 SampleTexture(float2 tex_coord)
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{
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return Invert(TextureLookup(tex_coord));
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}
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// Normal color calculation for most drawing modes.
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float4 NormalColor(float2 tex_coord : TEXCOORD0, float4 Flash : COLOR0, float4 InvFlash : COLOR1) : COLOR
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{
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return Flash + SampleTexture(tex_coord) * InvFlash;
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}
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// Copy the red channel to the alpha channel. Pays no attention to palettes.
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float4 RedToAlpha(float2 tex_coord : TEXCOORD0, float4 Flash : COLOR0, float4 InvFlash : COLOR1) : COLOR
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{
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float4 color = Invert(tex2D(Image, tex_coord));
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color.a = color.r;
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return Flash + color * InvFlash;
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}
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// Just return the value of c0.
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float4 VertexColor(float4 color : COLOR0) : COLOR
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{
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return color;
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}
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// Emulate one of the special colormaps. (Invulnerability, gold, etc.)
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float4 SpecialColormap(float2 tex_coord : TEXCOORD0, float4 start : COLOR0, float4 end : COLOR1) : COLOR
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{
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float4 color = SampleTexture(tex_coord);
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float4 range = end - start;
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// We can't store values greater than 1.0 in a color register, so we multiply
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// the final result by 2 and expect the caller to divide the start and end by 2.
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color.rgb = 2 * (start + Grayscale(color) * range);
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// Duplicate alpha semantics of NormalColor.
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color.a = start.a + color.a * end.a;
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return color;
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}
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// In-game colormap effect: fade to a particular color and multiply by another, with
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// optional desaturation of the original color. Desaturation is packed into color.a.
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// Fade level is packed int fade.a. Fade.rgb has been premultiplied by alpha.
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float4 InGameColormap(float2 tex_coord : TEXCOORD0, float4 color : COLOR0, float4 fade : COLOR1) : COLOR
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{
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float4 rgb = SampleTexture(tex_coord);
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// Desaturate
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#if DESAT
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float3 intensity;
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float invdesat;
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intensity.rgb = Grayscale(rgb) * color.a;
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invdesat = Weights.w - color.a;
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rgb.rgb = intensity + rgb * invdesat;
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#endif
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// Fade
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rgb.rgb = rgb.rgb * fade.aaa + fade.rgb;
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// Shade
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rgb.rgb = rgb.rgb * color.rgb;
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return rgb;
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}
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// Windowed gamma correction.
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float4 GammaCorrection(float2 tex_coord : TEXCOORD0) : COLOR
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{
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float4 color = tex2D(Image, tex_coord);
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#if !PS14
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color.rgb = pow(color.rgb, Gamma.rgb);
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#else
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// On PS14 targets, we can only sample once from each sampler
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// per stage. Fortunately, we have 16 samplers to play with,
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// so we can just set three of them to the gamma texture and
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// use one for each component. Unfortunately, all these
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// texture lookups are probably not as efficient as the pow()
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// solution that later targets make possible.
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color.r = tex1D(Gamma1, color.r * Gamma.w).r;
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color.g = tex1D(Gamma2, color.g * Gamma.w).g;
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color.b = tex1D(Gamma3, color.b * Gamma.w).b;
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#endif
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return color;
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}
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// The burn wipe effect.
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sampler2D NewScreen : register(s0);
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sampler2D Burn : register(s1);
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float4 BurnWipe(float2 coord[2] : TEXCOORD0) : COLOR
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{
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float4 color = tex2D(NewScreen, coord[0]);
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float4 alpha = tex2D(Burn, coord[1]);
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color.a = alpha.r * 2;
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return color;
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}
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