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author | Autechre | 2020-04-24 20:43:46 +0200 |
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committer | GitHub | 2020-04-24 20:43:46 +0200 |
commit | e68fbed7dafaca7b3099deb81c4cebc32f97138f (patch) | |
tree | c8714aab28845eab2eba183d841c36b65354b64e /plugins/gpu_unai/gpu_inner_light_arm.h | |
parent | 3c4ac5bb44b41d23eec217369eaa34f4e155f733 (diff) | |
parent | 335c38318d8bc32477a67633cba2a3292a6020dc (diff) | |
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Merge pull request #397 from justinweiss/arm-lighting-blending
unai: Add ARM-optimized lighting / blending functions
Diffstat (limited to 'plugins/gpu_unai/gpu_inner_light_arm.h')
-rw-r--r-- | plugins/gpu_unai/gpu_inner_light_arm.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/plugins/gpu_unai/gpu_inner_light_arm.h b/plugins/gpu_unai/gpu_inner_light_arm.h new file mode 100644 index 0000000..7bd5890 --- /dev/null +++ b/plugins/gpu_unai/gpu_inner_light_arm.h @@ -0,0 +1,112 @@ +#ifndef _OP_LIGHT_ARM_H_ +#define _OP_LIGHT_ARM_H_ + +//////////////////////////////////////////////////////////////////////////////// +// Extract bgr555 color from Gouraud u32 fixed-pt 8.3:8.3:8.2 rgb triplet +// +// INPUT: +// 'gCol' input: rrrrrrrrXXXggggggggXXXbbbbbbbbXX +// ^ bit 31 +// RETURNS: +// u16 output: 0bbbbbgggggrrrrr +// ^ bit 16 +// Where 'r,g,b' are integer bits of colors, 'X' fixed-pt, and '0' zero +//////////////////////////////////////////////////////////////////////////////// +GPU_INLINE uint_fast16_t gpuLightingRGBARM(u32 gCol) +{ + uint_fast16_t out = 0x03E0; // don't need the mask after starting to write output + u32 tmp; + + asm ("and %[tmp], %[gCol], %[out]\n\t" // tmp holds 0x000000bbbbb00000 + "and %[out], %[out], %[gCol], lsr #0x0B\n\t" // out holds 0x000000ggggg00000 + "orr %[tmp], %[out], %[tmp], lsl #0x05\n\t" // tmp holds 0x0bbbbbggggg00000 + "orr %[out], %[tmp], %[gCol], lsr #0x1B\n\t" // out holds 0x0bbbbbgggggrrrrr + : [out] "+&r" (out), [tmp] "=&r" (tmp) + : [gCol] "r" (gCol) + ); + + return out; +} + +//////////////////////////////////////////////////////////////////////////////// +// Apply fast (low-precision) 5-bit lighting to bgr555 texture color: +// +// INPUT: +// 'r5','g5','b5' are unsigned 5-bit color values, value of 15 +// is midpoint that doesn't modify that component of texture +// 'uSrc' input: mbbbbbgggggrrrrr +// ^ bit 16 +// RETURNS: +// u16 output: mbbbbbgggggrrrrr +// Where 'X' are fixed-pt bits. +//////////////////////////////////////////////////////////////////////////////// +GPU_INLINE uint_fast16_t gpuLightingTXTARM(uint_fast16_t uSrc, u8 r5, u8 g5, u8 b5) +{ + uint_fast16_t out = 0x03E0; + u32 db, dg; + + // Using `g` for src, `G` for dest + asm ("and %[dg], %[out], %[src] \n\t" // dg holds 0x000000ggggg00000 + "orr %[dg], %[dg], %[g5] \n\t" // dg holds 0x000000gggggGGGGG + "and %[db], %[out], %[src], lsr #0x05 \n\t" // db holds 0x000000bbbbb00000 + "ldrb %[dg], [%[lut], %[dg]] \n\t" // dg holds result 0x00000000000ggggg + "and %[out], %[out], %[src], lsl #0x05 \n\t" // out holds 0x000000rrrrr00000 + "orr %[out], %[out], %[r5] \n\t" // out holds 0x000000rrrrrRRRRR + "orr %[db], %[db], %[b5] \n\t" // db holds 0x000000bbbbbBBBBB + "ldrb %[out], [%[lut], %[out]] \n\t" // out holds result 0x00000000000rrrrr + "ldrb %[db], [%[lut], %[db]] \n\t" // db holds result 0x00000000000bbbbb + "tst %[src], #0x8000\n\t" // check whether msb was set on uSrc + "orr %[out], %[out], %[dg], lsl #0x05 \n\t" // out holds 0x000000gggggrrrrr + "orrne %[out], %[out], #0x8000\n\t" // add msb to out if set on uSrc + "orr %[out], %[out], %[db], lsl #0x0A \n\t" // out holds 0xmbbbbbgggggrrrrr + : [out] "=&r" (out), [db] "=&r" (db), [dg] "=&r" (dg) + : [r5] "r" (r5), [g5] "r" (g5), [b5] "r" (b5), + [lut] "r" (gpu_unai.LightLUT), [src] "r" (uSrc), "0" (out) + : "cc"); + return out; +} + +//////////////////////////////////////////////////////////////////////////////// +// Apply fast (low-precision) 5-bit Gouraud lighting to bgr555 texture color: +// +// INPUT: +// 'gCol' is a packed Gouraud u32 fixed-pt 8.3:8.3:8.2 rgb triplet, value of +// 15.0 is midpoint that does not modify color of texture +// gCol input : rrrrrXXXXXXgggggXXXXXXbbbbbXXXXX +// ^ bit 31 +// 'uSrc' input: mbbbbbgggggrrrrr +// ^ bit 16 +// RETURNS: +// u16 output: mbbbbbgggggrrrrr +// Where 'X' are fixed-pt bits, '0' is zero-padding, and '-' is don't care +//////////////////////////////////////////////////////////////////////////////// +GPU_INLINE uint_fast16_t gpuLightingTXTGouraudARM(uint_fast16_t uSrc, u32 gCol) +{ + uint_fast16_t out = 0x03E0; // don't need the mask after starting to write output + u32 db,dg,gtmp; + + // Using `g` for src, `G` for dest + asm ("and %[dg], %[out], %[src] \n\t" // dg holds 0x000000ggggg00000 + "and %[gtmp],%[out], %[gCol], lsr #0x0B \n\t" // gtmp holds 0x000000GGGGG00000 + "and %[db], %[out], %[src], lsr #0x05 \n\t" // db holds 0x000000bbbbb00000 + "orr %[dg], %[dg], %[gtmp], lsr #0x05 \n\t" // dg holds 0x000000gggggGGGGG + "and %[gtmp],%[out], %[gCol] \n\t" // gtmp holds 0x000000BBBBB00000 + "ldrb %[dg], [%[lut], %[dg]] \n\t" // dg holds result 0x00000000000ggggg + "and %[out], %[out], %[src], lsl #0x05 \n\t" // out holds 0x000000rrrrr00000 + "orr %[out], %[out], %[gCol], lsr #0x1B \n\t" // out holds 0x000000rrrrrRRRRR + "orr %[db], %[db], %[gtmp], lsr #0x05 \n\t" // db holds 0x000000bbbbbBBBBB + "ldrb %[out], [%[lut], %[out]] \n\t" // out holds result 0x00000000000rrrrr + "ldrb %[db], [%[lut], %[db]] \n\t" // db holds result 0x00000000000bbbbb + "tst %[src], #0x8000\n\t" // check whether msb was set on uSrc + "orr %[out], %[out], %[dg], lsl #0x05 \n\t" // out holds 0x000000gggggrrrrr + "orrne %[out], %[out], #0x8000\n\t" // add msb to out if set on uSrc + "orr %[out], %[out], %[db], lsl #0x0A \n\t" // out holds 0xmbbbbbgggggrrrrr + : [out] "=&r" (out), [db] "=&r" (db), [dg] "=&r" (dg), + [gtmp] "=&r" (gtmp) \ + : [gCol] "r" (gCol), [lut] "r" (gpu_unai.LightLUT), "0" (out), [src] "r" (uSrc) + : "cc"); + + return out; +} + +#endif //_OP_LIGHT_ARM_H_ |