kopia lustrzana https://github.com/OpenRTX/OpenRTX
143 wiersze
4.4 KiB
C
143 wiersze
4.4 KiB
C
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/***************************************************************************
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* Copyright (C) 2020 by Federico Izzo IU2NUO, Niccolò Izzo IU2KIN and *
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* Silvano Seva IU2KWO *
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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, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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/**
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* This driver provides an lcd screen emulator to allow UI development and
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* testing on a x86/x64 computer.
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* Graphics control is provided through SDL2 library, you need to have the SDL2
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* development library installed on your machine to compile and run code using
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* this driver.
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*/
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#include "lcd.h"
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#include <stdio.h>
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#include <string.h>
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#include <SDL2/SDL.h>
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#undef main /* necessary to avoid conflicts with SDL_main */
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/*
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* Screen dimensions, adjust basing on the size of the screen you need to
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* emulate
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*/
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#define SCREEN_WIDTH 160
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#define SCREEN_HEIGHT 128
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SDL_Window *window;
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SDL_Surface *renderSurface;
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uint16_t *frameBuffer;
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bool inProgress;
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void lcd_init()
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{
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if(SDL_Init(SDL_INIT_VIDEO) < 0)
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{
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printf("SDL video init error!!\n");
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}
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else
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{
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window = SDL_CreateWindow("",
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SDL_WINDOWPOS_UNDEFINED,
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SDL_WINDOWPOS_UNDEFINED,
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SCREEN_WIDTH,SCREEN_HEIGHT,
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SDL_WINDOW_SHOWN);
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renderSurface = SDL_GetWindowSurface(window);
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SDL_FillRect(renderSurface,NULL,0xFFFFFF);
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unsigned int scrSize = SCREEN_HEIGHT * SCREEN_WIDTH * sizeof(uint16_t);
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frameBuffer = (uint16_t *)(malloc(scrSize));
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memset(frameBuffer, 0xFFFF, scrSize);
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inProgress = false;
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}
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}
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void lcd_terminate()
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{
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SDL_DestroyWindow(window);
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}
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uint16_t lcd_screenWidth()
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{
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return SCREEN_WIDTH;
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}
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uint16_t lcd_screenHeight()
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{
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return SCREEN_HEIGHT;
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}
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void lcd_setBacklightLevel(uint8_t level)
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{
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printf("Backlight level set to %d\n", level);
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}
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void lcd_renderRows(uint8_t startRow, uint8_t endRow)
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{
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Uint32 *pixels = (Uint32*)renderSurface->pixels;
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inProgress = true;
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for(int x = 0; x < SCREEN_WIDTH; x++)
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{
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for(int y = startRow; y < endRow; y++)
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{
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/*
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* SDL pixel format is ARGB8888, while ours is RGB565, thus we need
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* to do some conversions when writing framebuffer content to the
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* window. We also set alpha value to its maximum.
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*/
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uint32_t r = (frameBuffer[x + y*SCREEN_WIDTH] & 0xF800) >> 11;
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uint32_t g = (frameBuffer[x + y*SCREEN_WIDTH] & 0x07E0) >> 5;
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uint32_t b = (frameBuffer[x + y*SCREEN_WIDTH] & 0x001F) & 0x1F;
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/*
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* Here we do conversions by multiplying by some scaling factors,
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* we use ints just because the precision of floats is not really
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* needed.
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* Conversion factors:
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* - five bit to eight bit: 8.226
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* - six bit to eight bit: 4.0476
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*/
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r = (r * 8) + (r * 226)/1000;
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g = (g * 4) + (g * 476)/10000;
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b = (b * 8) + (b * 226)/1000;
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pixels[x + y*SCREEN_WIDTH] = 0xFF000000 | (r << 16) | (g << 8) | b;
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}
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}
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inProgress = false;
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SDL_UpdateWindowSurface(window);
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}
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void lcd_render()
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{
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lcd_renderRows(0, SCREEN_HEIGHT);
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}
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bool lcd_renderingInProgress()
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{
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return inProgress;
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}
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uint16_t *lcd_getFrameBuffer()
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{
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return frameBuffer;
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}
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