+++ /dev/null
-#ifndef _OP_BLEND_ARM_H_
-#define _OP_BLEND_ARM_H_
-
-////////////////////////////////////////////////////////////////////////////////
-// Blend bgr555 color in 'uSrc' (foreground) with bgr555 color
-// in 'uDst' (background), returning resulting color.
-//
-// INPUT:
-// 'uSrc','uDst' input: -bbbbbgggggrrrrr
-// ^ bit 16
-// OUTPUT:
-// u16 output: 0bbbbbgggggrrrrr
-// ^ bit 16
-// RETURNS:
-// Where '0' is zero-padding, and '-' is don't care
-////////////////////////////////////////////////////////////////////////////////
-template <int BLENDMODE, bool SKIP_USRC_MSB_MASK>
-GPU_INLINE uint_fast16_t gpuBlendingARM(uint_fast16_t uSrc, uint_fast16_t uDst)
-{
- // These use Blargg's bitwise modulo-clamping:
- // http://blargg.8bitalley.com/info/rgb_mixing.html
- // http://blargg.8bitalley.com/info/rgb_clamped_add.html
- // http://blargg.8bitalley.com/info/rgb_clamped_sub.html
-
- uint_fast16_t mix;
-
- // 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));
- }
-
-
- // 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" // 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;
- // 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;
-
- 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 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" // 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));
- }
-
- return mix;
-}
-
-#endif //_OP_BLEND_ARM_H_