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Fix delta-R6G5B5 code (incl. new mapping algorithm)

This commit is contained in:
Jannik Vogel 2015-07-17 00:16:52 +02:00
parent 811673cfde
commit 58411243d1
1 changed files with 7 additions and 13 deletions
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20
hw/xbox/nv2a.c
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@ -2097,21 +2097,15 @@ static uint8_t* convert_texture_data(const TextureShape s,
int x, y; int x, y;
for (y = 0; y < height; y++) { for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) { for (x = 0; x < width; x++) {
uint8_t v; uint16_t rgb655 = *(uint16_t*)(data + y * pitch + x * 2);
uint16_t rgb565 = *(uint16_t*)(data + y * pitch + x * 2);
int8_t *pixel = &converted_data[(y * width + x) * 3]; int8_t *pixel = &converted_data[(y * width + x) * 3];
/* FIXME: This is pretty ugly code to extend from /* Maps 5 bit G and B signed value range to 8 bit
* signed 565 to signed 888 (hopefully) * signed values. R is probably unsigned.
*/ */
v = (rgb565 & 0xF800) >> 8; rgb655 ^= (1 << 9) | (1 << 4);
pixel[0] = (v & 0x80) ? *(int8_t*)&v * 16 / 0x80 pixel[0] = ((rgb655 & 0xFC00) >> 10) * 0x7F / 0x3F;
: ((v & 0x78) * 15) / 0x78; pixel[1] = ((rgb655 & 0x03E0) >> 5) * 0xFF / 0x1F - 0x80;
v = (rgb565 & 0x07E0) >> 3; pixel[2] = (rgb655 & 0x001F) * 0xFF / 0x1F - 0x80;
pixel[1] = (v & 0x80) ? *(int8_t*)&v * 32 / 0x80
: ((v & 0x7C) * 31) / 0x7C;
v = (rgb565 & 0x001F) << 3;
pixel[2] = (v & 0x80) ? *(int8_t*)&v * 16 / 0x80
: ((v & 0x78) * 15) / 0x78;
} }
} }
return converted_data; return converted_data;