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Cxbx-Reloaded
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added notes 

changed a couple things around and added notes

correct hemisphere formula

correct one entry

make twointoone shorter

Per PatrickvL's suggestion and code
This commit is contained in:
medievil1 2022-09-24 17:14:08 -04:00
parent 547c3ae663
commit 6bbe6cefe8
1 changed files with 25 additions and 6 deletions
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31
src/core/hle/D3D8/Direct3D9/CxbxPixelShaderTemplate.hlsl
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@ -205,20 +205,39 @@ float m21(const float input)
return (float)tmp / 127; // -128 scales to -1.007874016, 0 scales to 0.0, 127 scales to 1.0
}
float hls(float input) // 0..65535 range
{
float tmp = (float)(input);
tmp = (input < 32768) ? tmp / 32767 : (tmp - 65536) / 32767; // -1..1
return (float)tmp;
}
float hlu(float input) // 0..65535 range
{
return (float)input / 65535; // 0..1
}
float p2(float input) // power of 2
{
return input * input;
}
// Note : each component seems already in range [0..1], but two must be combined into one
#define TwoIntoOne(a,b) (((a * 255) * 256) + (b * 255)) / 255 // TODO : Verify whether this works at all !
#define TwoIntoOne(a,b) (((a * 256) + b) * 255)
#define CalcHiLo(in) H = TwoIntoOne(in.x, in.y); L = TwoIntoOne(in.z, in.w) // TODO : Verify whether this works at all !
// Dot mappings over the output value of a (4 component 8 bit unsigned) texture stage register into a (3 component float) vector value, for use in a dot product calculation:
#define PS_DOTMAPPING_ZERO_TO_ONE(in) dm = in.rgb // :r8g8b8a8->(r,g,b): 0x00=>0, 0xff=>1 thus : output = (input / 0xff )
#define PS_DOTMAPPING_MINUS1_TO_1_D3D(in) dm = float3(m21d(in.x), m21d(in.y), m21d(in.z)) // :r8g8b8a8->(r,g,b): 0x00=>-128/127, 0x01=>-1, 0x80=>0, 0xff=>1 thus : output = ((input - 0x100 ) / 0x7f )
#define PS_DOTMAPPING_MINUS1_TO_1_GL(in) dm = float3(m21g(in.x), m21g(in.y), m21g(in.z)) // :r8g8b8a8->(r,g,b): 0x80=>-1, 0x00=>0, 0x7f=>1 thus : output = (input < 0x80 ) ? (input / 0x7f ) : ((input - 0x100 ) / 0x80 ) (see https://en.wikipedia.org/wiki/Two's_complement)
#define PS_DOTMAPPING_MINUS1_TO_1(in) dm = float3(m21(in.x), m21(in.y), m21(in.z)) // :r8g8b8a8->(r,g,b): 0x80=>-128/127, ?0x81=>-1, 0x00=>0, 0x7f=>1 thus : output = (input < 0x80 ) ? (input / 0x7f ) : ((input - 0x100 ) / 0x7f ) (see https://en.wikipedia.org/wiki/Two's_complement)
#define PS_DOTMAPPING_MINUS1_TO_1(in) dm = float3(m21( in.x), m21( in.y), m21( in.z)) // :r8g8b8a8->(r,g,b): 0x80=>-128/127, ?0x81=>-1, 0x00=>0, 0x7f=>1 thus : output = (input < 0x80 ) ? (input / 0x7f ) : ((input - 0x100 ) / 0x7f ) (see https://en.wikipedia.org/wiki/Two's_complement)
#define PS_DOTMAPPING_HILO_1(in) CalcHiLo(in); dm = float3(H, L, 1) // :H16L16 ->(H,L,1): 0x0000=>0, 0xffff=>1 thus : output = (input / 0xffff)
#define PS_DOTMAPPING_HILO_HEMISPHERE_D3D(in) CalcHiLo(in); dm = float3(H, L, sqrt(1-(H*H)-(L*L))) // :H16L16 ->(H,L,sqrt(1-H^2-L^2)):? 0x8000=>-1, 0x0000=>0, 0x7fff=32767/32768 thus : output = ((input - 0x10000) / 0x7fff)
#define PS_DOTMAPPING_HILO_HEMISPHERE_GL(in) CalcHiLo(in); dm = float3(H, L, sqrt(1-(H*H)-(L*L))) // :H16L16 ->(H,L,sqrt(1-H^2-L^2)):? 0x8000=>-1, 0x0000=>0, 0x7fff=>1 thus : output = (input < 0x8000) ? (input / 0x7fff) : ((input - 0x10000) / 0x8000)
#define PS_DOTMAPPING_HILO_HEMISPHERE(in) CalcHiLo(in); dm = float3(H, L, sqrt(1-(H*H)-(L*L))) // :H16L16 ->(H,L,sqrt(1-H^2-L^2)): 0x8000=>-32768/32767, 0x8001=>-1, 0x0000=>0, 0x7fff=>1 thus : output = (input < 0x8000) ? (input / 0x7fff) : ((input - 0x10000) / 0x7fff)
#define PS_DOTMAPPING_HILO_1(in) CalcHiLo(in); dm = float3(hlu(H), hlu(L), 1) // :H16L16 ->(H,L,1): 0x0000=>0, 0xffff=>1 thus : output = (input / 0xffff)
#define PS_DOTMAPPING_HILO_HEMISPHERE_D3D(in) CalcHiLo(in); dm = float3(hls(H), hls(L), sqrt(1-p2(H)-p2(L))) // :H16L16 ->(H,L,sqrt(1-H^2-L^2)):? 0x8000=>-1, 0x0000=>0, 0x7fff=32767/32768 thus : output = ((input - 0x10000) / 0x7fff)
#define PS_DOTMAPPING_HILO_HEMISPHERE_GL(in) CalcHiLo(in); dm = float3(hls(H), hls(L), sqrt(1-p2(H)-p2(L))) // :H16L16 ->(H,L,sqrt(1-H^2-L^2)):? 0x8000=>-1, 0x0000=>0, 0x7fff=>1 thus : output = (input < 0x8000) ? (input / 0x7fff) : ((input - 0x10000) / 0x8000)
#define PS_DOTMAPPING_HILO_HEMISPHERE(in) CalcHiLo(in); dm = float3(hls(H), hls(L), sqrt(1-p2(H)-p2(L))) // :H16L16 ->(H,L,sqrt(1-H^2-L^2)): 0x8000=>-32768/32767, 0x8001=>-1, 0x0000=>0, 0x7fff=>1 thus : output = (input < 0x8000) ? (input / 0x7fff) : ((input - 0x10000) / 0x7fff)
// Declare one sampler per each {Sampler Type, Texture Stage} combination
// TODO : Generate sampler status?