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/*------------------------------------------------------------------------------
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-- This file is a part of the libuc, microcontroler library
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-- Copyright (C) 2013, Alexis Jeandet
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-------------------------------------------------------------------------------
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-- Author : Alexis Jeandet
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-- Mail : alexis.jeandet@gmail.com
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-------------------------------------------------------------------------------*/
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#include <SDL.h>
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#include <malloc.h>
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#include "SDLCD.h"
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SDL_Surface *screen;
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SDL_Overlay *bmp;
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int SDLCD_Xpos=0;
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int SDLCD_Ypos=0;
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int SDLCD_XWinStrt=0;
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int SDLCD_YWinStrt=0;
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int SDLCD_XWinEnd=0;
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int SDLCD_YWinEnd=0;
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void* SDLCD_buffer;
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int SDLCD_bpp;
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void SDLCD_putpixel(SDL_Surface *surface, int x, int y, Uint32 pixel);
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void SDLCD_mkscreen(int resx,int resy,int bpp,int lcdtype)
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{
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int i=0;
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if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER)) {
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fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
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exit(1);
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}
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screen = SDL_SetVideoMode(resx, resy, bpp, 0);
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if(!screen) {
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fprintf(stderr, "SDL: could not set video mode - exiting\n");
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exit(1);
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}
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if ( SDL_MUSTLOCK(screen) ) {
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if ( SDL_LockSurface(screen) < 0 ) {
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fprintf(stderr, "Can’t lock screen: %s\n", SDL_GetError());
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return;
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}
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}
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if ( SDL_MUSTLOCK(screen) ) {
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SDL_UnlockSurface(screen);
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}
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SDL_UpdateRect(screen, 0, 0, resx, resy);
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SDLCD_buffer = malloc(resx*resy*bpp/8);
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SDLCD_bpp = bpp;
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for(i=0;i<(resx*resy);i++)
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{
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SDLCD_putpixel(screen, i%resx, (i/resx), 0xFFFF);
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}
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}
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int SDLCD_init()
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{
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}
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void SDLCD_writereg(uint32_t reg,uint32_t data)
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{
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switch (reg) {
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case ILI9328_REGISTER_HORIZONTALGRAMADDRESSSET:
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SDLCD_Xpos = data;
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break;
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case ILI9328_REGISTER_VERTICALGRAMADDRESSSET:
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SDLCD_Ypos = data;
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break;
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case ILI9328_REGISTER_HORIZONTALADDRESSSTARTPOSITION:
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SDLCD_XWinStrt = data;
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break;
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case ILI9328_REGISTER_HORIZONTALADDRESSENDPOSITION:
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SDLCD_XWinEnd = data;
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break;
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case ILI9328_REGISTER_VERTICALADDRESSSTARTPOSITION:
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SDLCD_YWinStrt = data;
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break;
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case ILI9328_REGISTER_VERTICALADDRESSENDPOSITION:
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SDLCD_YWinEnd = data;
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break;
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default:
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break;
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}
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}
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uint32_t SDLCD_readreg(uint32_t reg)
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{
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return 0;
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}
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void SDLCD_putpixel(SDL_Surface *surface, int x, int y, Uint32 pixel)
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{
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int bpp = surface->format->BytesPerPixel;
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/* Here p is the address to the pixel we want to set */
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Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
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switch(bpp) {
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case 1:
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*p = pixel;
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break;
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case 2:
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*(Uint16 *)p = pixel;
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break;
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case 3:
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if(SDL_BYTEORDER == SDL_BIG_ENDIAN) {
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p[0] = (pixel >> 16) & 0xff;
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p[1] = (pixel >> 8) & 0xff;
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p[2] = pixel & 0xff;
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} else {
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p[0] = pixel & 0xff;
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p[1] = (pixel >> 8) & 0xff;
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p[2] = (pixel >> 16) & 0xff;
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}
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break;
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case 4:
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*(Uint32 *)p = pixel;
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break;
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}
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}
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Uint32 SDLCD_getpixel(SDL_Surface *surface, int x, int y)
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{
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int bpp = surface->format->BytesPerPixel;
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/* Here p is the address to the pixel we want to retrieve */
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Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
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switch(bpp) {
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case 1:
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return *p;
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case 2:
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return *(Uint16 *)p;
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case 3:
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if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
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return p[0] << 16 | p[1] << 8 | p[2];
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else
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return p[0] | p[1] << 8 | p[2] << 16;
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case 4:
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return *(Uint32 *)p;
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default:
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return 0;
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}
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/* shouldn’t happen, but avoids warnings */
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}
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void SDLCD_writeGRAM(void* buffer,uint32_t count)
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{
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int i=0;
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u_int16_t* ptr=(u_int16_t*)SDLCD_buffer;
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u_int16_t* inptr=(u_int16_t*)buffer;
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if ( SDL_MUSTLOCK(screen) ) {
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if ( SDL_LockSurface(screen) < 0 ) {
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fprintf(stderr, "Can’t lock screen: %s\n", SDL_GetError());
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return;
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}
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}
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for(i=0;i<count;i++)
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{
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SDLCD_putpixel(screen,SDLCD_Xpos,SDLCD_Ypos,inptr[i]);
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SDLCD_Xpos+=1;
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ptr[i]=inptr[i];
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if(SDLCD_Xpos>=SDLCD_XWinEnd)
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{
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SDLCD_Xpos=SDLCD_XWinStrt;
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SDLCD_Ypos+=1;
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}
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if(SDLCD_Ypos>=SDLCD_YWinEnd)
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{
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SDLCD_Ypos=SDLCD_YWinStrt;
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}
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}
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if ( SDL_MUSTLOCK(screen) ) {
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SDL_UnlockSurface(screen);
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}
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SDL_UpdateRect(screen, 0, 0, screen->w, screen->h);
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}
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void SDLCD_readGRAM(void* buffer,uint32_t count)
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{
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int i=0;
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u_int16_t* ptr=(u_int16_t*)SDLCD_buffer;
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u_int16_t* inptr=(u_int16_t*)buffer;
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for(i=0;i<count;i++)
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{
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inptr[i]=SDLCD_getpixel(screen,SDLCD_Xpos,SDLCD_Ypos);
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SDLCD_Xpos+=1;
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ptr[i]=inptr[i];
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if(SDLCD_Xpos>=SDLCD_XWinEnd)
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{
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SDLCD_Xpos=SDLCD_XWinStrt;
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SDLCD_Ypos+=1;
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}
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if(SDLCD_Ypos>=SDLCD_YWinEnd)
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{
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SDLCD_Ypos=SDLCD_YWinStrt;
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}
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}
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}
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