/*
 * PSP Software Development Kit - https://github.com/pspdev
 * -----------------------------------------------------------------------
 * Licensed under the BSD license, see LICENSE in PSPSDK root for details.
 *
 * Copyright (c) 2005 Jesper Svennevid
 */

#include "guInternal.h"

#include <pspkernel.h>
#include <pspge.h>
#include <pspuser.h>

int sceGuStart(int ctype, void *list)
{
#ifdef GU_DEBUG
	printf("sceGuStart(%d, %p);\n", ctype, list);
	assert(gu_init && "GU not initialized");
	assert((ctype == GU_DIRECT || ctype == GU_CALL || ctype == GU_SEND) && "Invalid context type");
#endif

	int intr;
	GuContext *context = &gu_contexts[ctype];
	unsigned int *local_list = (unsigned int *)(((unsigned int)list) | 0x40000000);

	intr = sceKernelCpuSuspendIntr();

	// setup display list

	context->list.start = local_list;
	context->list.current = local_list;
	context->list.parent_context = gu_curr_context;
	gu_list = &context->list;

	// store current context

	gu_curr_context = ctype;
	sceKernelCpuResumeIntr(intr);

	if (ctype == GU_DIRECT)
	{
		int res;
		res = sceGeListEnQueue(local_list, local_list, gu_settings.ge_callback_id, NULL);
		if (res < 0)
		{
			return res;
		}
		ge_list_executed[0] = res;
		gu_settings.signal_offset = 0;
	}

	if (!gu_init)
	{
		static int dither_matrix[16] =
			{
				-4, 0, -3, 1,
				2, -2, 3, -1,
				-3, 1, -4, 0,
				3, -1, 2, -2
			};

		sceGuSetDither((ScePspIMatrix4 *)dither_matrix);
		sceGuPatchDivide(16, 16);
		sceGuColorMaterial(GU_AMBIENT | GU_DIFFUSE | GU_SPECULAR);

		sceGuSpecular(1.0f);
		sceGuTexScale(1.0f, 1.0f);

		gu_init = 1;
	}

	if (ctype == GU_DIRECT && gu_draw_buffer.frame_width != 0)
	{
		sendCommandi(FRAME_BUF_PTR, ((unsigned int)gu_draw_buffer.frame_buffer));
		sendCommandi(FRAME_BUF_WIDTH, ((((unsigned int)gu_draw_buffer.frame_buffer) & 0xff000000) >> 8) | gu_draw_buffer.frame_width);
	}

	return 0;
}