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bitshift divison

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Edward R. Gonzalez
2025-08-04 19:45:22 -04:00
parent 7ac7371ac7
commit 2eb0c788ce
3 changed files with 15 additions and 13 deletions
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code/graphics_system/hello_image.s
+9 -12
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@@ -92,15 +92,15 @@ main:
stack_alloc gp_draw_tri_flat__sp_size ; (used for following call)
move rarg_0, reg_io_offset ; (used for following call)
load_imm rarg_1, Color_PS_GoldenPoppy
load_imm rarg_2, 100 * -1 + Display_HalfHeight << gp_b16_Y | -100 + Display_HalfWidth << gp_b16_X :: sw rarg_2, 0 * gp_vec2($sp)
load_imm rarg_2, 20 * -1 + Display_HalfHeight << gp_b16_Y | 20 + Display_HalfWidth << gp_b16_X :: sw rarg_2, 1 * gp_vec2($sp)
load_imm rarg_2, 50 * -1 + Display_HalfHeight << gp_b16_Y | 30 + Display_HalfWidth << gp_b16_X :: sw rarg_2, 2 * gp_vec2($sp)
load_imm rarg_2, 100 * -1 + Display_HalfHeight << gp_b16_Y | -100 + Display_HalfWidth << gp_b16_X :: store_word rarg_2, 0 * gp_vec2($sp)
load_imm rarg_2, 20 * -1 + Display_HalfHeight << gp_b16_Y | 20 + Display_HalfWidth << gp_b16_X :: store_word rarg_2, 1 * gp_vec2($sp)
load_imm rarg_2, 50 * -1 + Display_HalfHeight << gp_b16_Y | 30 + Display_HalfWidth << gp_b16_X :: store_word rarg_2, 2 * gp_vec2($sp)
jump_nlink gp_draw_tri_flat :: nop
; Bonus traingle
load_imm rarg_1, Color_PS_CadmiumRed
load_imm rarg_2, 50 * -1 + Display_HalfHeight << gp_b16_Y | -100 + Display_HalfWidth << gp_b16_X :: sw rarg_2, 0 * gp_vec2($sp)
load_imm rarg_2, 0 * -1 + Display_HalfHeight << gp_b16_Y | 20 + Display_HalfWidth << gp_b16_X :: sw rarg_2, 1 * gp_vec2($sp)
load_imm rarg_2, -100 * -1 + Display_HalfHeight << gp_b16_Y | 30 + Display_HalfWidth << gp_b16_X :: sw rarg_2, 2 * gp_vec2($sp)
load_imm rarg_2, 50 * -1 + Display_HalfHeight << gp_b16_Y | -100 + Display_HalfWidth << gp_b16_X :: store_word rarg_2, 0 * gp_vec2($sp)
load_imm rarg_2, 0 * -1 + Display_HalfHeight << gp_b16_Y | 20 + Display_HalfWidth << gp_b16_X :: store_word rarg_2, 1 * gp_vec2($sp)
load_imm rarg_2, -100 * -1 + Display_HalfHeight << gp_b16_Y | 30 + Display_HalfWidth << gp_b16_X :: store_word rarg_2, 2 * gp_vec2($sp)
jump_nlink gp_draw_tri_flat :: nop
stack_release gp_draw_tri_flat__sp_size
; Gourand shaded triangle
@@ -114,16 +114,13 @@ main:
; Copy image contents to vram
gcmd_push gp0, rtmp_1, gp_Blit_CPU_VM
gcmd_push gp0, rtmp_1, (Image_SizeY / 2) * -1 + Display_HalfHeight << gp_b16_Y | -(Image_SizeX / 2) + Display_HalfWidth << gp_b16_X
gcmd_push gp0, rtmp_1, 0 << gp_b16_Y | Display_Width << gp_b16_X
gcmd_push gp0, rtmp_1, Image_SizeY << gp_b16_Y | Image_SizeX << gp_b16_X
; DMA commands
@id equ rtmp_2
@img_cursor equ rtmp_3
@divisor equ rtmp_3
load_imm @id, Image_ByteSize
load_imm @divisor, word
div @id, @divisor
mov_from_high @id
load_imm @id, Image_ByteSize
shift_rl @id, @id, (word / 2)
load_addr @img_cursor, Image
loop_dma:
load_word rtmp_1, (@img_cursor) :: nop :: store_word rtmp_1, gp0 ; @img_curor -> gp_dma_cpu_vm(word)