First commit

1 files changed, 70 insertions, 0 deletions

diff --git a/libpsn00b/psxgpu/loadimage.s b/libpsn00b/psxgpu/loadimage.s
new file mode 100644
index 0000000..2376b31
--- /dev/null
+++ b/libpsn00b/psxgpu/loadimage.s
@@ -0,0 +1,70 @@
+.set noreorder
+
+.include "hwregs_a.h"
+
+.set RECT_x,	0
+.set RECT_y,	2
+.set RECT_w,	4
+.set RECT_h,	6
+
+.section .text
+
+
+.global LoadImage
+.type LoadImage, @function
+LoadImage:
+	addiu	$sp, -8
+	sw		$ra, 0($sp)
+	sw		$s0, 4($sp)
+
+	lui		$s0, 0x1f80			# Set I/O segment base address
+
+.gpu_wait:						# Wait for GPU to be ready for commands and DMA
+	jal		ReadGPUstat
+	nop
+	srl		$v0, 0x1a
+	andi	$v0, 0x5
+	li		$v1, 5
+	#srl		$v0, 28
+	#andi	$v0, 1
+	bne		$v0, $v1, .gpu_wait
+	nop
+
+	lui		$v0, 0x400			# Set DMA direction to off
+	sw		$v0, GP1($s0)
+
+	lui		$v0, 0x0100			# Clear GPU cache
+	sw		$v0, GP0($s0)
+
+	lui		$v1, 0xa000			# Load image to VRAM
+	sw		$v1, GP0($s0)
+	lw		$v0, RECT_x($a0)	# Set XY and dimensions of image
+	lw		$v1, RECT_w($a0)
+	sw		$v0, GP0($s0)
+	sw		$v1, GP0($s0)
+
+	lui		$v0, 0x400			# Set DMA direction to CPUtoVRAM
+	ori		$v0, 0x2
+	sw		$v0, GP1($s0)
+
+	lhu		$v0, RECT_w($a0)	# Get rectangle size
+	lhu		$v1, RECT_h($a0)
+	nop
+	mult	$v0, $v1			# Calculate BCR value
+	mflo	$v1
+	srl		$v1, 0x4
+	sll		$v1, 0x10
+	ori		$v1, 0x8
+
+	sw		$a1, D2_MADR($s0)	# Set DMA base address and transfer length
+	sw		$v1, D2_BCR($s0)
+
+	lui		$v0, 0x100			# Start DMA transfer
+	ori		$v0, 0x201
+	sw		$v0, D2_CHCR($s0)
+
+	lw		$ra, 0($sp)
+	lw		$s0, 4($sp)
+	jr		$ra
+	addiu	$sp, 8
+