1 #ifndef _OP_LIGHT_ARM_H_
2 #define _OP_LIGHT_ARM_H_
4 #include "arm_features.h"
6 ////////////////////////////////////////////////////////////////////////////////
7 // Extract bgr555 color from Gouraud u32 fixed-pt 8.3:8.3:8.2 rgb triplet
10 // 'gCol' input: rrrrrrrrXXXggggggggXXXbbbbbbbbXX
13 // u16 output: 0bbbbbgggggrrrrr
15 // Where 'r,g,b' are integer bits of colors, 'X' fixed-pt, and '0' zero
16 ////////////////////////////////////////////////////////////////////////////////
17 GPU_INLINE uint_fast16_t gpuLightingRGBARM(u32 gCol)
19 uint_fast16_t out = 0x03E0; // don't need the mask after starting to write output
22 asm ("and %[tmp], %[gCol], %[out]\n\t" // tmp holds 0x000000bbbbb00000
23 "and %[out], %[out], %[gCol], lsr #0x0B\n\t" // out holds 0x000000ggggg00000
24 "orr %[tmp], %[out], %[tmp], lsl #0x05\n\t" // tmp holds 0x0bbbbbggggg00000
25 "orr %[out], %[tmp], %[gCol], lsr #0x1B\n\t" // out holds 0x0bbbbbgggggrrrrr
26 : [out] "+&r" (out), [tmp] "=&r" (tmp)
33 ////////////////////////////////////////////////////////////////////////////////
34 // Apply fast (low-precision) 5-bit lighting to bgr555 texture color:
37 // 'r5','g5','b5' are unsigned 5-bit color values, value of 15
38 // is midpoint that doesn't modify that component of texture
39 // 'uSrc' input: mbbbbbgggggrrrrr
42 // u16 output: mbbbbbgggggrrrrr
43 // Where 'X' are fixed-pt bits.
44 ////////////////////////////////////////////////////////////////////////////////
46 // clang uses smulbb but not gcc, so we need this
47 GPU_INLINE int_fast16_t smulbb(int_fast16_t a, int_fast16_t b)
50 asm("smulbb %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
54 GPU_INLINE uint_fast16_t gpuLightingTXTARM(uint_fast16_t uSrc, u8 r5, u8 g5, u8 b5)
56 // on v6 we have single-cycle mul and sat which is better than the lut
57 int_fast16_t r = smulbb(uSrc & 0x001f, r5);
58 int_fast16_t g = smulbb(uSrc & 0x03e0, g5);
59 int_fast16_t b = smulbb(uSrc & 0x7c00, b5);
60 asm volatile("usat %0, #5, %0, asr #4" : "=r"(r) : "0"(r));
61 asm volatile("usat %0, #5, %0, asr #9" : "=r"(g) : "0"(g));
62 asm volatile("usat %0, #5, %0, asr #14" : "=r"(b) : "0"(b));
63 return (uSrc & 0x8000) | (b << 10) | (g << 5) | r;
66 GPU_INLINE uint_fast16_t gpuLightingTXTARM(uint_fast16_t uSrc, u8 r5, u8 g5, u8 b5)
68 uint_fast16_t out = 0x03E0;
71 // Using `g` for src, `G` for dest
72 asm ("and %[dg], %[out], %[src] \n\t" // dg holds 0x000000ggggg00000
73 "orr %[dg], %[dg], %[g5] \n\t" // dg holds 0x000000gggggGGGGG
74 "and %[db], %[out], %[src], lsr #0x05 \n\t" // db holds 0x000000bbbbb00000
75 "ldrb %[dg], [%[lut], %[dg]] \n\t" // dg holds result 0x00000000000ggggg
76 "and %[out], %[out], %[src], lsl #0x05 \n\t" // out holds 0x000000rrrrr00000
77 "orr %[out], %[out], %[r5] \n\t" // out holds 0x000000rrrrrRRRRR
78 "orr %[db], %[db], %[b5] \n\t" // db holds 0x000000bbbbbBBBBB
79 "ldrb %[out], [%[lut], %[out]] \n\t" // out holds result 0x00000000000rrrrr
80 "ldrb %[db], [%[lut], %[db]] \n\t" // db holds result 0x00000000000bbbbb
81 "tst %[src], #0x8000\n\t" // check whether msb was set on uSrc
82 "orr %[out], %[out], %[dg], lsl #0x05 \n\t" // out holds 0x000000gggggrrrrr
83 "orrne %[out], %[out], #0x8000\n\t" // add msb to out if set on uSrc
84 "orr %[out], %[out], %[db], lsl #0x0A \n\t" // out holds 0xmbbbbbgggggrrrrr
85 : [out] "=&r" (out), [db] "=&r" (db), [dg] "=&r" (dg)
86 : [r5] "r" (r5), [g5] "r" (g5), [b5] "r" (b5),
87 [lut] "r" (gpu_unai.LightLUT), [src] "r" (uSrc), "0" (out)
93 ////////////////////////////////////////////////////////////////////////////////
94 // Apply fast (low-precision) 5-bit Gouraud lighting to bgr555 texture color:
97 // 'gCol' is a packed Gouraud u32 fixed-pt 8.3:8.3:8.2 rgb triplet, value of
98 // 15.0 is midpoint that does not modify color of texture
99 // gCol input : rrrrrXXXXXXgggggXXXXXXbbbbbXXXXX
101 // 'uSrc' input: mbbbbbgggggrrrrr
104 // u16 output: mbbbbbgggggrrrrr
105 // Where 'X' are fixed-pt bits, '0' is zero-padding, and '-' is don't care
106 ////////////////////////////////////////////////////////////////////////////////
107 GPU_INLINE uint_fast16_t gpuLightingTXTGouraudARM(uint_fast16_t uSrc, u32 gCol)
109 uint_fast16_t out = 0x03E0; // don't need the mask after starting to write output
112 // Using `g` for src, `G` for dest
113 asm ("and %[dg], %[out], %[src] \n\t" // dg holds 0x000000ggggg00000
114 "and %[gtmp],%[out], %[gCol], lsr #0x0B \n\t" // gtmp holds 0x000000GGGGG00000
115 "and %[db], %[out], %[src], lsr #0x05 \n\t" // db holds 0x000000bbbbb00000
116 "orr %[dg], %[dg], %[gtmp], lsr #0x05 \n\t" // dg holds 0x000000gggggGGGGG
117 "and %[gtmp],%[out], %[gCol] \n\t" // gtmp holds 0x000000BBBBB00000
118 "ldrb %[dg], [%[lut], %[dg]] \n\t" // dg holds result 0x00000000000ggggg
119 "and %[out], %[out], %[src], lsl #0x05 \n\t" // out holds 0x000000rrrrr00000
120 "orr %[out], %[out], %[gCol], lsr #0x1B \n\t" // out holds 0x000000rrrrrRRRRR
121 "orr %[db], %[db], %[gtmp], lsr #0x05 \n\t" // db holds 0x000000bbbbbBBBBB
122 "ldrb %[out], [%[lut], %[out]] \n\t" // out holds result 0x00000000000rrrrr
123 "ldrb %[db], [%[lut], %[db]] \n\t" // db holds result 0x00000000000bbbbb
124 "tst %[src], #0x8000\n\t" // check whether msb was set on uSrc
125 "orr %[out], %[out], %[dg], lsl #0x05 \n\t" // out holds 0x000000gggggrrrrr
126 "orrne %[out], %[out], #0x8000\n\t" // add msb to out if set on uSrc
127 "orr %[out], %[out], %[db], lsl #0x0A \n\t" // out holds 0xmbbbbbgggggrrrrr
128 : [out] "=&r" (out), [db] "=&r" (db), [dg] "=&r" (dg),
129 [gtmp] "=&r" (gtmp) \
130 : [gCol] "r" (gCol), [lut] "r" (gpu_unai.LightLUT), "0" (out), [src] "r" (uSrc)
136 #endif //_OP_LIGHT_ARM_H_