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hng64 : Lighting calculations are now more accurate. [Andrew Gardner]

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This commit is contained in:
Andrew Gardner 2010-03-16 04:53:11 +00:00
parent 378fb68577
commit e0347e2fa3
1 changed files with 14 additions and 6 deletions
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20
src/mame/video/hng64.c
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@ -2441,8 +2441,8 @@ void recoverPolygonBlock(running_machine* machine, const UINT16* packet, struct
float intensity = vecDotProduct(transformedNormal, lightVector) * -1.0f;
intensity = (intensity <= 0.0f) ? (0.0f) : (intensity);
intensity *= lightStrength * 128.0f * 0.5f; // HACK. This 0.5 is completely arbitrary.
intensity *= 255.0f;
intensity *= lightStrength * 128.0f; // Turns 0x0100 into 1.0
intensity *= 128.0; // Maps intensity to the range [0.0, 2.0]
if (intensity >= 255.0f) intensity = 255.0f;
polys[*numPolys].vert[v].light[0] = intensity;
@ -3097,15 +3097,23 @@ INLINE void FillSmoothTexPCHorizontalLine(running_machine *machine,
paletteEntry %= prOptions.palPageSize;
UINT32 color = machine->pens[prOptions.palOffset + paletteEntry];
// Application of the lighting
UINT32 red = RGB_RED(color) + (UINT8)(r_start/w_start);
UINT32 green = RGB_GREEN(color) + (UINT8)(g_start/w_start);
UINT32 blue = RGB_BLUE(color) + (UINT8)(b_start/w_start);
// Apply the lighting
float rIntensity = (r_start/w_start) / 255.0f;
float gIntensity = (g_start/w_start) / 255.0f;
float bIntensity = (b_start/w_start) / 255.0f;
float red = RGB_RED(color) * rIntensity;
float green = RGB_GREEN(color) * gIntensity;
float blue = RGB_BLUE(color) * bIntensity;
// Clamp and finalize
red = RGB_RED(color) + red;
green = RGB_GREEN(color) + green;
blue = RGB_BLUE(color) + blue;
if (red >= 255) red = 255;
if (green >= 255) green = 255;
if (blue >= 255) blue = 255;
color = MAKE_ARGB(255, (UINT8)red, (UINT8)green, (UINT8)blue);
*cb = color;