182 lines
6.6 KiB
ArmAsm
182 lines
6.6 KiB
ArmAsm
.align 2
|
|
|
|
.global expand_blend
|
|
.global expand_normal
|
|
|
|
@ Input:
|
|
@ r0 = screen_src_ptr
|
|
@ r1 = screen_dest_ptr
|
|
@ r2 = start
|
|
@ r3 = end
|
|
|
|
6:
|
|
.word io_registers
|
|
.word palette_ram_converted
|
|
.word 0x04000200 @ combine test mask
|
|
.word 0x07E0F81F @ clamp mask
|
|
.word 0x000003FE @ palette index mask
|
|
.word 0x08010020 @ saturation mask
|
|
|
|
expand_blend:
|
|
stmdb sp!, { r4, r5, r6, r9, r10, r11, r14 }
|
|
|
|
add r0, r0, r2, lsl #2 @ screen_src_ptr += start
|
|
add r1, r1, r2, lsl #1 @ screen_dest_ptr += start
|
|
sub r2, r3, r2 @ r2 = end - start
|
|
ldr r3, 6b @ r3 = io_registers
|
|
ldr r3, [r3, #0x52] @ r3 = bldalpha
|
|
mov r4, r3, lsr #8 @ r4 = bldalpha >> 8
|
|
and r3, r3, #0x1F @ r3 = blend_a
|
|
and r4, r4, #0x1F @ r4 = blend_b
|
|
cmp r3, #16 @ if(blend_a > 16)
|
|
movgt r3, #16 @ blend_a = 16
|
|
cmp r4, #16 @ if(blend_b > 16)
|
|
movgt r3, #16 @ blend_b = 16
|
|
|
|
ldr r14, 6b + 4 @ r14 = palette_ram_converted
|
|
ldr r12, 6b + 8 @ r12 = 0x04000200
|
|
ldr r11, 6b + 12 @ r11 = 0x07E0F81F
|
|
ldr r10, 6b + 16 @ r10 = 0x000003FE
|
|
|
|
add r5, r3, r4 @ r5 = blend_a + blend_b
|
|
cmp r5, #16 @ if((blend_a + blend_b) > 16)
|
|
bgt 3f @ goto loop w/saturation
|
|
|
|
|
|
@ loop w/o saturation
|
|
1:
|
|
ldr r5, [r0], #4 @ r5 = pixel_pair, screen_src_ptr++
|
|
and r6, r5, r12 @ r6 = r5 & 0x04000200
|
|
cmp r6, r12 @ if(r6 != 0x4000200)
|
|
bne 2f @ goto no_blend
|
|
|
|
and r6, r10, r5, lsl #1 @ r6 = (pixel_pair & 0x1FF) << 1
|
|
ldrh r6, [r14, r6] @ r6 = pixel_top
|
|
orr r6, r6, r6, lsl #16 @ r6 = pixel_top | (pixel_top << 16)
|
|
and r6, r6, r11 @ r6 = pixel_top_dilated
|
|
|
|
and r5, r10, r5, lsr #15 @ r5 = ((pixel_pair >> 16) & 0x1FF) << 1
|
|
ldrh r5, [r14, r5] @ r5 = pixel_bottom
|
|
orr r5, r5, r5, lsl #16 @ r5 = pixel_bottom | (pixel_bottom << 16)
|
|
and r5, r5, r11 @ r5 = pixel_bottom_dilated
|
|
|
|
mul r5, r4, r5 @ r5 = pixel_bottom * blend_b = bottom_mul
|
|
mla r5, r3, r6, r5 @ r5 = (pixel_top * blend_a) + bottom_mul
|
|
|
|
and r5, r11, r5, lsr #4 @ r5 = (color_dilated >> 4) & 0x07E0F81F
|
|
orr r5, r5, r5, lsr #16 @ r5 = color_dilated | (color_dilated >> 16)
|
|
|
|
strh r5, [r1], #2 @ *screen_dest_ptr = r5, screen_dest_ptr++
|
|
subs r2, r2, #1 @ counter--
|
|
bne 1b @ go again
|
|
|
|
ldmia sp!, { r4, r5, r6, r9, r10, r11, pc }
|
|
|
|
2:
|
|
and r5, r10, r5, lsl #1 @ r5 = (pixel_pair & 0x1FF) << 1
|
|
ldrh r5, [r14, r5] @ r5 = pixel_top
|
|
strh r5, [r1], #2 @ *screen_dest_ptr = r5, screen_dest_ptr++
|
|
|
|
subs r2, r2, #1 @ counter--
|
|
bne 1b @ go again
|
|
|
|
ldmia sp!, { r4, r5, r6, r9, r10, r11, pc }
|
|
|
|
@ loop w/saturation
|
|
|
|
3:
|
|
ldr r9, 6b + 20 @ r9 = 0x08010020
|
|
|
|
4:
|
|
ldr r5, [r0], #4 @ r5 = pixel_pair, screen_src_ptr++
|
|
and r6, r5, r12 @ r6 = r5 & 0x04000200
|
|
cmp r6, r12 @ if(r6 != 0x4000200)
|
|
bne 5f @ goto no_blend
|
|
|
|
and r6, r10, r5, lsl #1 @ r6 = (pixel_pair & 0x1FF) << 1
|
|
ldrh r6, [r14, r6] @ r6 = pixel_top
|
|
orr r6, r6, r6, lsl #16 @ r6 = pixel_top | (pixel_top << 16)
|
|
and r6, r6, r11 @ r6 = pixel_top_dilated
|
|
|
|
and r5, r10, r5, lsr #15 @ r5 = ((pixel_pair >> 16) & 0x1FF) << 1
|
|
ldrh r5, [r14, r5] @ r5 = pixel_bottom
|
|
orr r5, r5, r5, lsl #16 @ r5 = pixel_bottom | (pixel_bottom << 16)
|
|
and r5, r5, r11 @ r5 = pixel_bottom_dilated
|
|
|
|
mul r5, r4, r5 @ r5 = pixel_bottom * blend_b = bottom_mul
|
|
mla r5, r3, r6, r5 @ r5 = (pixel_top * blend_a) + bottom_mul
|
|
|
|
and r6, r9, r5, lsr #4 @ r6 = saturation bits
|
|
orr r6, r6, r6, lsr #1 @ propogate saturation down msb
|
|
orr r6, r6, r6, lsr #2 @ propogate down next two bits
|
|
orr r6, r6, r6, lsr #3 @ propogate down next three bits
|
|
orr r5, r6, r5, lsr #4 @ mask over result w/saturation
|
|
|
|
and r5, r11, r5 @ r5 = (color_dilated >> 4) & 0x07E0F81F
|
|
orr r5, r5, r5, lsr #16 @ r5 = color_dilated | (color_dilated >> 16)
|
|
strh r5, [r1], #2 @ *screen_dest_ptr = r5, screen_dest_ptr++
|
|
|
|
subs r2, r2, #1 @ counter--
|
|
bne 4b @ go again
|
|
|
|
ldmia sp!, { r4, r5, r6, r9, r10, r11, pc }
|
|
|
|
5:
|
|
and r5, r10, r5, lsl #1 @ r5 = (pixel_pair & 0x1FF) << 1
|
|
ldrh r5, [r14, r5] @ r5 = pixel_top
|
|
strh r5, [r1], #2 @ *screen_dest_ptr = r5, screen_dest_ptr++
|
|
|
|
subs r2, r2, #1 @ counter--
|
|
bne 4b @ go again
|
|
|
|
ldmia sp!, { r4, r5, r6, r9, r10, r11, pc }
|
|
|
|
|
|
|
|
@ The following function isn't complete (only works on run multiples of 8),
|
|
@ but unfortunately I don't see much potential for actually being able to
|
|
@ use it..
|
|
|
|
#define expand_pixel_pair(reg, temp) ;\
|
|
and temp, r3, reg, lsr #15 ;\
|
|
ldrh temp, [r2, temp] ;\
|
|
;\
|
|
and reg, r3, reg, lsl #1 ;\
|
|
ldrh reg, [r2, reg] ;\
|
|
;\
|
|
orr reg, reg, temp, lsl #16 ;\
|
|
|
|
|
|
@ Input:
|
|
@ r0 = screen_ptr
|
|
@ r1 = start
|
|
@ r2 = end
|
|
|
|
1:
|
|
.word palette_ram_converted
|
|
.word 0x3FE
|
|
|
|
expand_normal:
|
|
stmdb sp!, { r4, r5, r6, r7, r14 }
|
|
|
|
add r0, r0, r1, lsl #1 @ screen_ptr += start
|
|
sub r1, r2, r1 @ r1 = end - start
|
|
ldr r2, 1b @ r2 = palette_ram_converted
|
|
ldr r3, 1b + 4 @ r3 = 0x3FE
|
|
|
|
2:
|
|
ldmia r0, { r4, r5, r6, r7 }
|
|
|
|
expand_pixel_pair(r4, r14)
|
|
expand_pixel_pair(r5, r14)
|
|
expand_pixel_pair(r6, r14)
|
|
expand_pixel_pair(r7, r14)
|
|
|
|
stmia r0!, { r4, r5, r6, r7 }
|
|
|
|
subs r1, r1, #8
|
|
bne 2b
|
|
|
|
ldmia sp!, { r4, r5, r6, r7, pc }
|
|
|