/*
 * Copyright (C) 1999 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
 *
 * This file is part of mga_vid.
 *
 * mga_vid is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * mga_vid is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with mga_vid; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

//#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <inttypes.h>
#include <string.h>
#include "mga_vid.h"

mga_vid_config_t config;
uint8_t *mga_vid_base;
uint32_t is_g400;

#define SRC_IMAGE_WIDTH 256
#define SRC_IMAGE_HEIGHT 256

uint8_t y_image[SRC_IMAGE_WIDTH * SRC_IMAGE_HEIGHT];
uint8_t cr_image[SRC_IMAGE_WIDTH * SRC_IMAGE_HEIGHT];
uint8_t cb_image[SRC_IMAGE_WIDTH * SRC_IMAGE_HEIGHT];


void
write_frame_g200(uint8_t *y,uint8_t *cr, uint8_t *cb)
{
	uint8_t *dest;
	uint32_t bespitch,h,w;

	dest = mga_vid_base;
	bespitch = (config.src_width + 31) & ~31;

	for(h=0; h < config.src_height; h++) 
	{
		memcpy(dest, y, config.src_width);
		y += config.src_width;
		dest += bespitch;
	}

	for(h=0; h < config.src_height/2; h++) 
	{
		for(w=0; w < config.src_width/2; w++) 
		{
			*dest++ = *cb++;
			*dest++ = *cr++;
		}
		dest += bespitch - config.src_width;
	}
}

void
write_frame_g400(uint8_t *y,uint8_t *cr, uint8_t *cb)
{
	uint8_t *dest;
	uint32_t bespitch,h;

	dest = mga_vid_base;
	bespitch = (config.src_width + 31) & ~31;

	for(h=0; h < config.src_height; h++) 
	{
		memcpy(dest, y, config.src_width);
		y += config.src_width;
		dest += bespitch;
	}

	for(h=0; h < config.src_height/2; h++) 
	{
		memcpy(dest, cb, config.src_width/2);
		cb += config.src_width/2;
		dest += bespitch/2;
	}

	for(h=0; h < config.src_height/2; h++) 
	{
		memcpy(dest, cr, config.src_width/2);
		cr += config.src_width/2;
		dest += bespitch/2;
	}
}

void write_frame(uint8_t *y,uint8_t *cr, uint8_t *cb)
{
	if(is_g400)
		write_frame_g400(y,cr,cb);
	else
		write_frame_g200(y,cr,cb);
}

void
draw_cool_pattern(void)
{
	int i,x,y;

	i = 0;
	for (y=0; y<config.src_height; y++) {
		for (x=0; x<config.src_width; x++) {
			y_image[i++] = x*x/2 + y*y/2 - 128;
		}
	}

	i = 0;
	for (y=0; y<config.src_height/2; y++) 
		for (x=0; x<config.src_width/2; x++) 
		{
				cr_image[i++] = x - 128;
		}

	i = 0;
	for (y=0; y<config.src_height/2; y++) 
		for (x=0; x<config.src_width/2; x++) 
		{
				cb_image[i++] = y - 128;
		}
}

void
draw_color_blend(void)
{
	int i,x,y;

	i = 0;
	for (y=0; y<config.src_height; y++) {
		for (x=0; x<config.src_width; x++) {
			y_image[i++] = 0;
		}
	}

	i = 0;
	for (y=0; y<config.src_height/2; y++) 
		for (x=0; x<config.src_width/2; x++) 
		{
				cr_image[i++] = x - 128;
		}

	i = 0;
	for (y=0; y<config.src_height/2; y++) 
		for (x=0; x<config.src_width/2; x++) 
		{
				cb_image[i++] = y - 128;
		}
}


int 
main(void)
{
	int f;

	f = open("/dev/mga_vid",O_RDWR);

	if(f == -1)
	{
		fprintf(stderr,"Couldn't open driver\n");
		exit(1);
	}

	config.version = MGA_VID_VERSION;
	config.src_width = SRC_IMAGE_WIDTH;
	config.src_height= SRC_IMAGE_HEIGHT;
	config.dest_width = SRC_IMAGE_WIDTH;
	config.dest_height = SRC_IMAGE_HEIGHT;
	config.x_org= 10;
	config.y_org= 10;
	config.colkey_on = 0;
        config.format = MGA_VID_FORMAT_YV12;
	config.frame_size=SRC_IMAGE_WIDTH*SRC_IMAGE_HEIGHT*2;
	config.num_frames=1;

	if (ioctl(f,MGA_VID_CONFIG,&config))
	{
		perror("Error in config ioctl");
	}

	if (config.card_type == MGA_G200) 
	{
		printf("Testing MGA G200 Backend Scaler with %d MB of RAM\n", config.ram_size);
	  is_g400 = 0;
	}
	else
	{
		printf("Testing MGA G400 Backend Scaler with %d MB of RAM\n", config.ram_size);
	  is_g400 = 1;
	}
	
	ioctl(f,MGA_VID_ON,0);
	mga_vid_base = (uint8_t*)mmap(0,256 * 4096,PROT_WRITE,MAP_SHARED,f,0);
	printf("mga_vid_base = %8p\n",mga_vid_base);


	//memset(y_image,80,256 * 128);
	//memset(cr_image,80,256/2 * 20);
	//memset(cb_image,80,256/2 * 20);
	write_frame(y_image,cr_image,cb_image);
	printf("(1) There should be a green square, offset by 10 pixels from\n"
			   "    the upper left corner displayed\n");
	sleep(3);


	draw_cool_pattern();
	write_frame(y_image,cr_image,cb_image);
	printf("(2) There should be a cool mosaic like pattern now.\n");
	sleep(3);

	draw_color_blend();
	write_frame(y_image,cr_image,cb_image);
	printf("(3) There should be a color blend with black, red, purple, blue\n"
			   "    corners (starting top left going CW)\n");
	sleep(3);

	ioctl(f,MGA_VID_OFF,0);

	close(f);
	return 0;
}
