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