/* * Voxel-a-tord * display.c: * Copyright (c) 2021-2022 986-Studio. All rights reserved. * * Created by Manoƫl Trapier on 01/03/2021. */ #include #include #include #include #include #include #include /*********************************************************************************************************************** * Variables **********************************************************************************************************************/ static SDL_Window *window = NULL; static SDL_Renderer *renderer = NULL; static colour_t *frameBuffer = NULL; static double *zBuffer = NULL; static SDL_Texture *frameBufferTexture = NULL; static int32_t windowWidth = 1024; static int32_t windowHeight = 768; static TTF_Font *font = NULL; /*********************************************************************************************************************** * Functions **********************************************************************************************************************/ #define MAX(_a, _b) ((_a) < (_b)) ? (_b) : (_a) #define MIN(_a, _b) ((_a) > (_b)) ? (_b) : (_a) static inline void intSwap(int *a, int *b) { int tmp = *a; *a = *b; *b = tmp; } bool initialiseWindow(int32_t width, int32_t height, bool fullScreen) { bool ret = false; int windowFlags = 0; int fullscreenWidth; int fullscreenHeight; if (SDL_Init(SDL_INIT_EVERYTHING)) { Log(TLOG_PANIC, NULL, "SDL Initialisation error!! error: %s", SDL_GetError()); goto exit; } Log(TLOG_DEBUG, NULL, "SDL properly initialised!"); ret = TTF_Init(); if (ret) { Log(TLOG_PANIC, NULL, "SDL_ttf Initialisation error!! error: %s", SDL_GetError()); goto exit; } windowWidth = width; windowHeight = height; if (fullScreen) { Log(TLOG_DEBUG, NULL, "Will go fullscreen! Fasten your seatbelts!"); SDL_DisplayMode displayMode; SDL_GetCurrentDisplayMode(0, &displayMode); fullscreenWidth = displayMode.w; fullscreenHeight = displayMode.h; windowFlags = SDL_WINDOW_BORDERLESS; } else { fullscreenWidth = width; fullscreenHeight = height; } window = SDL_CreateWindow(NULL, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, fullscreenWidth, fullscreenHeight, windowFlags); if (window == NULL) { Log(TLOG_PANIC, NULL, "SDL Window creation error: %s", SDL_GetError()); goto exit; } Log(TLOG_DEBUG, NULL, "SDL Window created!"); renderer = SDL_CreateRenderer(window, -1, 0); if (renderer == NULL) { Log(TLOG_PANIC, NULL, "SDL Renderer creation error: %s", SDL_GetError()); goto exit; } Log(TLOG_DEBUG, NULL, "SDL Renderer created!"); font = TTF_OpenFont("assets/pico8.ttf", 8); if (font == NULL) { Log(TLOG_WARNING, NULL, "Cannot open the font for printing...: %s", SDL_GetError()); goto exit; } frameBuffer = (uint32_t *)calloc(windowWidth * windowHeight, sizeof(uint32_t)); if (!frameBuffer) { Log(TLOG_PANIC, NULL, "Memory allocation error."); goto exit; } zBuffer = (double *)calloc(windowWidth * windowHeight, sizeof(double)); if (!frameBuffer) { Log(TLOG_PANIC, NULL, "Memory allocation error."); goto exit; } frameBufferTexture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STREAMING, windowWidth, windowHeight); if (frameBufferTexture == NULL) { Log(TLOG_PANIC, NULL, "SDL Texture creation error: %s", SDL_GetError()); goto exit; } if (fullScreen) { SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN); } ret = true; exit: return ret; } void getWindowSize(int32_t *width, int32_t *height) { *width = windowWidth; *height = windowHeight; } void destroyWindow() { if (font != NULL) { TTF_CloseFont(font); } if (frameBuffer != NULL) { free(frameBuffer); } if (zBuffer != NULL) { free(zBuffer); } SDL_DestroyRenderer(renderer); SDL_DestroyWindow(window); SDL_Quit(); } void displayWindowClear() { SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255); SDL_RenderClear(renderer); } void displayWindowRender() { SDL_RenderPresent(renderer); } void renderFrameBuffer() { SDL_UpdateTexture(frameBufferTexture, NULL, frameBuffer, (uint32_t)(windowWidth * sizeof(uint32_t))); SDL_RenderCopy(renderer, frameBufferTexture, NULL, NULL); } void drawText(int32_t x, int32_t y, colour_t colour, const char *format, ...) { va_list va; uint8_t r = ((colour >> 16) & 0xFF); uint8_t g = ((colour >> 8) & 0xFF); uint8_t b = ((colour ) & 0xFF); SDL_Color c = { r, g, b , 255}; char buffer[512]; va_start(va, format); vsnprintf(buffer, 512, format, va); va_end(va); SDL_Surface *surface = TTF_RenderText_Blended(font, buffer, c); SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface); int labelWidth, labelHeight; SDL_QueryTexture(texture, NULL, NULL, &labelWidth, &labelHeight); SDL_Rect destRect = { x, y, labelWidth, labelHeight }; SDL_RenderCopyEx(renderer, texture, NULL, &destRect,0, NULL, SDL_FLIP_NONE); SDL_FreeSurface(surface); SDL_DestroyTexture(texture); } void drawPixel(int32_t x, int32_t y, colour_t colour) { if ((x >= 0) && (x < windowWidth) && (y >= 0) && (y < windowHeight)) { frameBuffer[x + (y * windowWidth)] = colour; } } void drawVLine(int32_t x, int32_t y0, int32_t y1, colour_t colour) { int32_t i; if (y0 > y1) { intSwap(&y0, &y1); } if ( ((x < 0) || (x > windowWidth)) || ((y0 < 0) && (y1 < 0)) || ((y0 > windowHeight) && (y1 > windowHeight)) ) { return; } y0 = MAX(0, y0); y1 = MIN(y1, (windowHeight - 1)); uint32_t *currentPos = &frameBuffer[x + (y0 * windowWidth)]; for(i = y0; i <= y1; i++, currentPos+=windowWidth) { *currentPos = colour; } } void drawHLine(int32_t x0, int32_t y, int32_t x1, colour_t colour) { int32_t i; if (x0 > x1) { intSwap(&x0, &x1); } if ( ((y < 0) || (y > windowHeight)) || ((x0 < 0) && (x1 < 0)) || ((x0 > windowWidth) && (x1 > windowWidth)) ) { return; } x0 = MAX(0, x0); x1 = MIN(x1, (windowWidth - 1)); uint32_t *currentPos = &frameBuffer[x0 + (y * windowWidth)]; for(i = x0; i <= x1; i++, currentPos++) { *currentPos = colour; } } void clearFrameBuffer(colour_t colour) { int32_t x; for (x = 0 ; x < windowWidth * windowHeight ; x++) { frameBuffer[x] = colour; } } void drawGrid(int spacing, colour_t colour) { int32_t x, y; for (y = 0 ; y < windowHeight ; y++) { for (x = 0 ; x < windowWidth ; x++) { if (((x % spacing) == 0) || ((y % spacing) == 0)) { frameBuffer[x + (y * windowWidth)] = colour; } } } } void drawRectangle(int32_t x, int32_t y, int32_t w, int32_t h, colour_t colour) { int32_t j; for (j = 0 ; j < h ; j++) { drawHLine(x, y + j, x + w, colour); } } /* FIXME: Some out of screen line may render weirdly. Will fix that later */ void drawLine(int32_t x0, int32_t y0, int32_t x1, int32_t y1, colour_t colour) { int i; int32_t deltaX = x1 - x0; int32_t deltaY = y1 - y0; int32_t sideLength = ( abs(deltaX) >= abs(deltaY) ) ? abs(deltaX) : abs(deltaY); double incrementX = deltaX / (double)sideLength; double incrementY = deltaY / (double)sideLength; if (deltaX == 0) { drawVLine(x0, y0, y1, colour); } else if (deltaY == 0) { drawHLine(x0, y0, x1, colour); } else { double currentX = x0; double currentY = y0; for (i = 0 ; i < sideLength ; i++) { drawPixel(round(currentX), round(currentY), colour); currentX += incrementX; currentY += incrementY; } } }