From 335c38318d8bc32477a67633cba2a3292a6020dc Mon Sep 17 00:00:00 2001 From: Justin Weiss Date: Sun, 19 Apr 2020 10:18:54 -0700 Subject: Clean up indentation / add comments for assembly functions --- plugins/gpu_unai/gpu_inner.h | 12 +-- plugins/gpu_unai/gpu_inner_blend_arm.h | 99 ++++++++++++------------ plugins/gpu_unai/gpu_inner_light_arm.h | 135 ++++++++++++++++++++------------- 3 files changed, 138 insertions(+), 108 deletions(-) (limited to 'plugins/gpu_unai') diff --git a/plugins/gpu_unai/gpu_inner.h b/plugins/gpu_unai/gpu_inner.h index 8314790..76479f9 100644 --- a/plugins/gpu_unai/gpu_inner.h +++ b/plugins/gpu_unai/gpu_inner.h @@ -357,10 +357,10 @@ static void gpuSpriteSpanFn(u16 *pDst, u32 count, u8* pTxt, u32 u0) // Blend func can save an operation if it knows uSrc MSB is unset. // Untextured prims can always skip (source color always comes with MSB=0). // For textured prims, the generic lighting funcs always return it unset. (bonus!) - const bool skip_uSrc_mask = MSB_PRESERVED ? (!CF_TEXTMODE) : (!CF_TEXTMODE) || CF_LIGHT; + const bool skip_uSrc_mask = MSB_PRESERVED ? (!CF_TEXTMODE) : (!CF_TEXTMODE) || CF_LIGHT; uint_fast16_t uSrc, uDst, srcMSB; - bool should_blend; + bool should_blend; u32 u0_mask = gpu_unai.TextureWindow[2]; u8 r5, g5, b5; @@ -402,7 +402,7 @@ static void gpuSpriteSpanFn(u16 *pDst, u32 count, u8* pTxt, u32 u0) if (CF_LIGHT) uSrc = gpuLightingTXT(uSrc, r5, g5, b5); - should_blend = MSB_PRESERVED ? uSrc & 0x8000 : srcMSB; + should_blend = MSB_PRESERVED ? uSrc & 0x8000 : srcMSB; if (CF_BLEND && should_blend) uSrc = gpuBlending(uSrc, uDst); @@ -487,8 +487,8 @@ static void gpuPolySpanFn(const gpu_unai_t &gpu_unai, u16 *pDst, u32 count) // Blend func can save an operation if it knows uSrc MSB is unset. // Untextured prims can always skip this (src color MSB is always 0). // For textured prims, the generic lighting funcs always return it unset. (bonus!) - const bool skip_uSrc_mask = MSB_PRESERVED ? (!CF_TEXTMODE) : (!CF_TEXTMODE) || CF_LIGHT; - bool should_blend; + const bool skip_uSrc_mask = MSB_PRESERVED ? (!CF_TEXTMODE) : (!CF_TEXTMODE) || CF_LIGHT; + bool should_blend; u32 bMsk; if (CF_BLITMASK) bMsk = gpu_unai.blit_mask; @@ -653,7 +653,7 @@ endpolynotextgou: uSrc = gpuLightingTXT(uSrc, r5, g5, b5); } - should_blend = MSB_PRESERVED ? uSrc & 0x8000 : srcMSB; + should_blend = MSB_PRESERVED ? uSrc & 0x8000 : srcMSB; if (CF_BLEND && should_blend) uSrc = gpuBlending(uSrc, uDst); } diff --git a/plugins/gpu_unai/gpu_inner_blend_arm.h b/plugins/gpu_unai/gpu_inner_blend_arm.h index 5ddbdbb..6413527 100644 --- a/plugins/gpu_unai/gpu_inner_blend_arm.h +++ b/plugins/gpu_unai/gpu_inner_blend_arm.h @@ -22,79 +22,80 @@ GPU_INLINE uint_fast16_t gpuBlendingARM(uint_fast16_t uSrc, uint_fast16_t uDst) // http://blargg.8bitalley.com/info/rgb_clamped_add.html // http://blargg.8bitalley.com/info/rgb_clamped_sub.html - uint_fast16_t mix; - asm ("bic %[uDst], %[uDst], #0x8000" : [uDst] "+r" (uDst)); + // Clear preserved msb + asm ("bic %[uDst], %[uDst], #0x8000" : [uDst] "+r" (uDst)); + + if (BLENDMODE == 3) { + // Prepare uSrc for blending ((0.25 * uSrc) & (0.25 * mask)) + asm ("and %[uSrc], %[mask], %[uSrc], lsr #0x2" : [uSrc] "+r" (uSrc) : [mask] "r" (0x1ce7)); + } else if (!SKIP_USRC_MSB_MASK) { + asm ("bic %[uSrc], %[uSrc], #0x8000" : [uSrc] "+r" (uSrc)); + } - if (BLENDMODE == 3) { - asm ("and %[uSrc], %[mask], %[uSrc], lsr #0x2" : [uSrc] "+r" (uSrc) : [mask] "r" (0x1ce7)); - } else if (!SKIP_USRC_MSB_MASK) { - asm ("bic %[uSrc], %[uSrc], #0x8000" : [uSrc] "+r" (uSrc)); - } - // 0.5 x Back + 0.5 x Forward if (BLENDMODE==0) { - // mix = ((uSrc + uDst) - ((uSrc ^ uDst) & 0x0421)) >> 1; - asm ("eor %[mix], %[uSrc], %[uDst]\n\t" - "and %[mix], %[mix], %[mask]\n\t" - "sub %[mix], %[uDst], %[mix]\n\t" - "add %[mix], %[uSrc], %[mix]\n\t" - "mov %[mix], %[mix], lsr #0x1\n\t" - : [mix] "=&r" (mix) - : [uSrc] "r" (uSrc), [uDst] "r" (uDst), [mask] "r" (0x0421)); - } + // mix = ((uSrc + uDst) - ((uSrc ^ uDst) & 0x0421)) >> 1; + asm ("eor %[mix], %[uSrc], %[uDst]\n\t" // uSrc ^ uDst + "and %[mix], %[mix], %[mask]\n\t" // ... & 0x0421 + "sub %[mix], %[uDst], %[mix]\n\t" // uDst - ... + "add %[mix], %[uSrc], %[mix]\n\t" // uSrc + ... + "mov %[mix], %[mix], lsr #0x1\n\t" // ... >> 1 + : [mix] "=&r" (mix) + : [uSrc] "r" (uSrc), [uDst] "r" (uDst), [mask] "r" (0x0421)); + } - if (BLENDMODE == 1 || BLENDMODE == 3) { - // u32 sum = uSrc + uDst; + if (BLENDMODE == 1 || BLENDMODE == 3) { + // u32 sum = uSrc + uDst; // u32 low_bits = (uSrc ^ uDst) & 0x0421; // u32 carries = (sum - low_bits) & 0x8420; // u32 modulo = sum - carries; // u32 clamp = carries - (carries >> 5); // mix = modulo | clamp; - u32 sum; + u32 sum; - asm ("add %[sum], %[uSrc], %[uDst]\n\t" - "eor %[mix], %[uSrc], %[uDst]\n\t" - "and %[mix], %[mix], %[mask]\n\t" - "sub %[mix], %[sum], %[mix]\n\t" - "and %[mix], %[mix], %[mask], lsl #0x05\n\t" - "sub %[sum], %[sum], %[mix] \n\t" - "sub %[mix], %[mix], %[mix], lsr #0x05\n\t" - "orr %[mix], %[sum], %[mix]" - : [sum] "=&r" (sum), [mix] "=&r" (mix) - : [uSrc] "r" (uSrc), [uDst] "r" (uDst), [mask] "r" (0x0421)); - } + asm ("add %[sum], %[uSrc], %[uDst]\n\t" // sum = uSrc + uDst + "eor %[mix], %[uSrc], %[uDst]\n\t" // uSrc ^ uDst + "and %[mix], %[mix], %[mask]\n\t" // low_bits = (... & 0x0421) + "sub %[mix], %[sum], %[mix]\n\t" // sum - low_bits + "and %[mix], %[mix], %[mask], lsl #0x05\n\t" // carries = ... & 0x8420 + "sub %[sum], %[sum], %[mix] \n\t" // modulo = sum - carries + "sub %[mix], %[mix], %[mix], lsr #0x05\n\t" // clamp = carries - (carries >> 5) + "orr %[mix], %[sum], %[mix]" // mix = modulo | clamp + : [sum] "=&r" (sum), [mix] "=&r" (mix) + : [uSrc] "r" (uSrc), [uDst] "r" (uDst), [mask] "r" (0x0421)); + } // 1.0 x Back - 1.0 x Forward if (BLENDMODE==2) { - u32 diff; - // u32 diff = uDst - uSrc + 0x8420; + u32 diff; + // u32 diff = uDst - uSrc + 0x8420; // u32 low_bits = (uDst ^ uSrc) & 0x8420; // u32 borrows = (diff - low_bits) & 0x8420; // u32 modulo = diff - borrows; // u32 clamp = borrows - (borrows >> 5); // mix = modulo & clamp; - asm ("sub %[diff], %[uDst], %[uSrc]\n\t" - "add %[diff], %[diff], %[mask]\n\t" - "eor %[mix], %[uDst], %[uSrc]\n\t" - "and %[mix], %[mix], %[mask]\n\t" - "sub %[mix], %[diff], %[mix]\n\t" - "and %[mix], %[mix], %[mask]\n\t" - "sub %[diff], %[diff], %[mix]\n\t" - "sub %[mix], %[mix], %[mix], lsr #0x05\n\t" - "and %[mix], %[diff], %[mix]" - : [diff] "=&r" (diff), [mix] "=&r" (mix) - : [uSrc] "r" (uSrc), [uDst] "r" (uDst), [mask] "r" (0x8420)); + asm ("sub %[diff], %[uDst], %[uSrc]\n\t" // uDst - uSrc + "add %[diff], %[diff], %[mask]\n\t" // diff = ... + 0x8420 + "eor %[mix], %[uDst], %[uSrc]\n\t" // uDst ^ uSrc + "and %[mix], %[mix], %[mask]\n\t" // low_bits = ... & 0x8420 + "sub %[mix], %[diff], %[mix]\n\t" // diff - low_bits + "and %[mix], %[mix], %[mask]\n\t" // borrows = ... & 0x8420 + "sub %[diff], %[diff], %[mix]\n\t" // modulo = diff - borrows + "sub %[mix], %[mix], %[mix], lsr #0x05\n\t" // clamp = borrows - (borrows >> 5) + "and %[mix], %[diff], %[mix]" // mix = modulo & clamp + : [diff] "=&r" (diff), [mix] "=&r" (mix) + : [uSrc] "r" (uSrc), [uDst] "r" (uDst), [mask] "r" (0x8420)); } - // There's not a case where we can get into this function, - // SKIP_USRC_MSB_MASK is false, and the msb of uSrc is unset. - if (!SKIP_USRC_MSB_MASK) { - asm ("orr %[mix], %[mix], #0x8000" : [mix] "+r" (mix)); - } + // There's not a case where we can get into this function, + // SKIP_USRC_MSB_MASK is false, and the msb of uSrc is unset. + if (!SKIP_USRC_MSB_MASK) { + asm ("orr %[mix], %[mix], #0x8000" : [mix] "+r" (mix)); + } return mix; } diff --git a/plugins/gpu_unai/gpu_inner_light_arm.h b/plugins/gpu_unai/gpu_inner_light_arm.h index a1c3628..7bd5890 100644 --- a/plugins/gpu_unai/gpu_inner_light_arm.h +++ b/plugins/gpu_unai/gpu_inner_light_arm.h @@ -14,70 +14,99 @@ //////////////////////////////////////////////////////////////////////////////// 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; + 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) - ); + 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; + 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; - asm ("and %[dg], %[out], %[src] \n\t" - "orr %[dg], %[dg], %[g5] \n\t" - "and %[db], %[out], %[src], lsr #0x05 \n\t" - "ldrb %[dg], [%[lut], %[dg]] \n\t" - "and %[out], %[out], %[src], lsl #0x05 \n\t" - "orr %[out], %[out], %[r5] \n\t" - "orr %[db], %[db], %[b5] \n\t" - "ldrb %[out], [%[lut], %[out]] \n\t" - "ldrb %[db], [%[lut], %[db]] \n\t" - "tst %[src], #0x8000\n\t" - "orr %[out], %[out], %[dg], lsl #0x05 \n\t" - "orrne %[out], %[out], #0x8000\n\t" - "orr %[out], %[out], %[db], lsl #0x0A \n\t" - : [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; + 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; - asm ("and %[dg], %[out], %[src] \n\t" - "and %[gtmp],%[out], %[gCol], lsr #0x0B \n\t" - "and %[db], %[out], %[src], lsr #0x05 \n\t" - "orr %[dg], %[dg], %[gtmp], lsr #0x05 \n\t" - "and %[gtmp],%[out], %[gCol] \n\t" - "ldrb %[dg], [%[lut], %[dg]] \n\t" - "and %[out], %[out], %[src], lsl #0x05 \n\t" - "orr %[out], %[out], %[gCol], lsr #0x1B \n\t" - "orr %[db], %[db], %[gtmp], lsr #0x05 \n\t" - "ldrb %[out], [%[lut], %[out]] \n\t" - "ldrb %[db], [%[lut], %[db]] \n\t" - "tst %[src], #0x8000\n\t" - "orr %[out], %[out], %[dg], lsl #0x05 \n\t" - "orrne %[out], %[out], #0x8000\n\t" - "orr %[out], %[out], %[db], lsl #0x0A \n\t" - : [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"); + 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; + return out; } #endif //_OP_LIGHT_ARM_H_ -- cgit v1.2.3