#include "glN64.h"
#include "Types.h"
#include "VI.h"
#include "OpenGL.h"
#include "N64.h"
#include "gSP.h"
#include "gDP.h"
#include "RSP.h"
#include "FrameBuffer.h"
#include "Debug.h"

VIInfo VI;

void VI_UpdateSize()
{
	f32 xScale = _FIXED2FLOAT( _SHIFTR( *REG.VI_X_SCALE, 0, 12 ), 10 );
	f32 xOffset = _FIXED2FLOAT( _SHIFTR( *REG.VI_X_SCALE, 16, 12 ), 10 );

	f32 yScale = _FIXED2FLOAT( _SHIFTR( *REG.VI_Y_SCALE, 0, 12 ), 10 );
	f32 yOffset = _FIXED2FLOAT( _SHIFTR( *REG.VI_Y_SCALE, 16, 12 ), 10 );

	u32 hEnd = _SHIFTR( *REG.VI_H_START, 0, 10 );
	u32 hStart = _SHIFTR( *REG.VI_H_START, 16, 10 );

	// These are in half-lines, so shift an extra bit
	u32 vEnd = _SHIFTR( *REG.VI_V_START, 1, 9 );
	u32 vStart = _SHIFTR( *REG.VI_V_START, 17, 9 );

	VI.width = (hEnd - hStart) * xScale;
	VI.height = (vEnd - vStart) * yScale * 1.0126582f;

	if (VI.width == 0.0f) VI.width = 320.0f;
	if (VI.height == 0.0f) VI.height = 240.0f;
}

void VI_UpdateScreen()
{
	glFinish();

	if (OGL.frameBufferTextures)
	{
		FrameBuffer *current = FrameBuffer_FindBuffer( *REG.VI_ORIGIN );

		if ((*REG.VI_ORIGIN != VI.lastOrigin) || ((current) && current->changed))
		{
			if (gDP.colorImage.changed)
			{
				FrameBuffer_SaveBuffer( gDP.colorImage.address, gDP.colorImage.size, gDP.colorImage.width, gDP.colorImage.height );
				gDP.colorImage.changed = FALSE;
			}

			FrameBuffer_RenderBuffer( *REG.VI_ORIGIN );

			gDP.colorImage.changed = FALSE;
			VI.lastOrigin = *REG.VI_ORIGIN;
#ifdef DEBUG
			while (Debug.paused && !Debug.step);
			Debug.step = FALSE;
#endif
		}
	}
	else
	{
		if (gSP.changed & CHANGED_COLORBUFFER)
		{
#ifndef __LINUX__
			SwapBuffers( OGL.hDC );
#else
			OGL_SwapBuffers();
#endif
			gSP.changed &= ~CHANGED_COLORBUFFER;
#ifdef DEBUG
			while (Debug.paused && !Debug.step);
			Debug.step = FALSE;
#endif
		}
	}
	glFinish();
}