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@@ -0,0 +1,457 @@
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+/*
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+ * Voxel-a-tord
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+ * display.c:
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+ * Copyright (c) 2021-2022 986-Studio. All rights reserved.
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+ *
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+ * Created by Manoël Trapier on 01/03/2021.
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+ */
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+
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+#include <stdio.h>
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+#include <stdbool.h>
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+
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+#include <SDL.h>
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+#include <SDL_ttf.h>
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+
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+#include <3dengine.h>
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+#include <log.h>
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+#include <display.h>
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+
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+/***********************************************************************************************************************
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+ * Variables
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+ **********************************************************************************************************************/
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+static SDL_Window *window = NULL;
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+static SDL_Renderer *renderer = NULL;
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+static colour_t *frameBuffer = NULL;
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+static double *zBuffer = NULL;
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+static SDL_Texture *frameBufferTexture = NULL;
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+static int32_t windowWidth = 1024;
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+static int32_t windowHeight = 768;
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+static TTF_Font *font = NULL;
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+
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+/***********************************************************************************************************************
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+ * Functions
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+ **********************************************************************************************************************/
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+#define MAX(_a, _b) ((_a) < (_b)) ? (_b) : (_a)
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+#define MIN(_a, _b) ((_a) > (_b)) ? (_b) : (_a)
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+
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+bool initialiseWindow(int32_t width, int32_t height, bool fullScreen)
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+{
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+ bool ret = false;
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+ int windowFlags = 0;
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+ int fullscreenWidth;
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+ int fullscreenHeight;
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+
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+ if (SDL_Init(SDL_INIT_EVERYTHING))
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+ {
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+ Log(TLOG_PANIC, NULL, "SDL Initialisation error!! error: %s", SDL_GetError());
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+ goto exit;
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+ }
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+
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+ Log(TLOG_DEBUG, NULL, "SDL properly initialised!");
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+
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+ ret = TTF_Init();
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+ if (ret)
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+ {
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+ Log(TLOG_PANIC, NULL, "SDL_ttf Initialisation error!! error: %s", SDL_GetError());
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+ goto exit;
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+ }
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+
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+ windowWidth = width;
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+ windowHeight = height;
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+
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+ if (fullScreen)
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+ {
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+ Log(TLOG_DEBUG, NULL, "Will go fullscreen! Fasten your seatbelts!");
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+ SDL_DisplayMode displayMode;
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+ SDL_GetCurrentDisplayMode(0, &displayMode);
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+
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+ fullscreenWidth = displayMode.w;
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+ fullscreenHeight = displayMode.h;
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+
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+ windowFlags = SDL_WINDOW_BORDERLESS;
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+ }
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+ else
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+ {
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+ fullscreenWidth = width;
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+ fullscreenHeight = height;
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+ }
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+
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+ window = SDL_CreateWindow(NULL, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, fullscreenWidth, fullscreenHeight,
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+ windowFlags);
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+ if (window == NULL)
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+ {
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+ Log(TLOG_PANIC, NULL, "SDL Window creation error: %s", SDL_GetError());
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+ goto exit;
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+ }
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+ Log(TLOG_DEBUG, NULL, "SDL Window created!");
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+
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+ renderer = SDL_CreateRenderer(window, -1, 0);
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+ if (renderer == NULL)
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+ {
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+ Log(TLOG_PANIC, NULL, "SDL Renderer creation error: %s", SDL_GetError());
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+ goto exit;
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+ }
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+ Log(TLOG_DEBUG, NULL, "SDL Renderer created!");
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+
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+ font = TTF_OpenFont("assets/pico8.ttf", 8);
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+ if (font == NULL)
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+ {
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+ Log(TLOG_WARNING, NULL, "Cannot open the font for printing...: %s", SDL_GetError());
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+ goto exit;
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+ }
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+
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+ frameBuffer = (uint32_t *)calloc(windowWidth * windowHeight, sizeof(uint32_t));
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+ if (!frameBuffer)
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+ {
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+ Log(TLOG_PANIC, NULL, "Memory allocation error.");
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+ goto exit;
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+ }
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+
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+ zBuffer = (double *)calloc(windowWidth * windowHeight, sizeof(double));
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+ if (!frameBuffer)
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+ {
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+ Log(TLOG_PANIC, NULL, "Memory allocation error.");
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+ goto exit;
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+ }
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+
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+ frameBufferTexture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STREAMING, windowWidth,
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+ windowHeight);
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+ if (frameBufferTexture == NULL)
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+ {
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+ Log(TLOG_PANIC, NULL, "SDL Texture creation error: %s", SDL_GetError());
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+ goto exit;
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+ }
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+
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+ if (fullScreen)
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+ {
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+ SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN);
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+ }
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+
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+ ret = true;
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+
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+exit:
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+ return ret;
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+}
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+
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+void getWindowSize(int32_t *width, int32_t *height)
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+{
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+ *width = windowWidth;
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+ *height = windowHeight;
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+}
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+
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+void destroyWindow()
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+{
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+ if (font != NULL)
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+ {
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+ TTF_CloseFont(font);
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+ }
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+ if (frameBuffer != NULL)
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+ {
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+ free(frameBuffer);
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+ }
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+ if (zBuffer != NULL)
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+ {
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+ free(zBuffer);
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+ }
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+ SDL_DestroyRenderer(renderer);
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+ SDL_DestroyWindow(window);
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+ SDL_Quit();
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+}
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+
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+void displayWindowClear()
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+{
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+ SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
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+ SDL_RenderClear(renderer);
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+}
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+
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+void displayWindowRender()
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+{
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+ SDL_RenderPresent(renderer);
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+}
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+
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+void renderFrameBuffer()
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+{
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+ SDL_UpdateTexture(frameBufferTexture, NULL, frameBuffer, (uint32_t)(windowWidth * sizeof(uint32_t)));
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+ SDL_RenderCopy(renderer, frameBufferTexture, NULL, NULL);
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+}
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+
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+void drawText(int32_t x, int32_t y, colour_t colour, const char *format, ...)
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+{
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+ va_list va;
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+ uint8_t r = ((colour >> 16) & 0xFF);
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+ uint8_t g = ((colour >> 8) & 0xFF);
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+ uint8_t b = ((colour ) & 0xFF);
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+ SDL_Color c = { r, g, b , 255};
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+ char buffer[512];
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+
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+ va_start(va, format);
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+ vsnprintf(buffer, 512, format, va);
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+ va_end(va);
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+
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+ SDL_Surface *surface = TTF_RenderText_Blended(font, buffer, c);
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+ SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface);
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+
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+ int labelWidth, labelHeight;
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+
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+ SDL_QueryTexture(texture, NULL, NULL, &labelWidth, &labelHeight);
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+
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+ SDL_Rect destRect =
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+ {
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+ x, y, labelWidth, labelHeight
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+ };
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+ SDL_RenderCopyEx(renderer, texture, NULL, &destRect,0, NULL, SDL_FLIP_NONE);
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+
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+ SDL_FreeSurface(surface);
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+ SDL_DestroyTexture(texture);
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+}
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+
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+void drawPixel(int32_t x, int32_t y, colour_t colour)
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+{
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+ if ((x >= 0) && (x < windowWidth) && (y >= 0) && (y < windowHeight))
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+ {
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+ frameBuffer[x + (y * windowWidth)] = colour;
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+ }
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+}
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+
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+void drawVLine(int32_t x, int32_t y0, int32_t y1, colour_t colour)
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+{
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+ int32_t i;
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+ if (y0 > y1) {
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+ intSwap(&y0, &y1); }
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+
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+ if ( ((x < 0) || (x > windowWidth)) ||
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+ ((y0 < 0) && (y1 < 0)) ||
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+ ((y0 > windowHeight) && (y1 > windowHeight)) )
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+ {
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+ return;
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+ }
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+
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+ y0 = MAX(0, y0);
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+ y1 = MIN(y1, (windowHeight - 1));
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+
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+ uint32_t *currentPos = &frameBuffer[x + (y0 * windowWidth)];
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+
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+ for(i = y0; i <= y1; i++, currentPos+=windowWidth)
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+ {
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+ *currentPos = colour;
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+ }
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+}
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+
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+void drawHLine(int32_t x0, int32_t y, int32_t x1, colour_t colour)
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+{
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+ int32_t i;
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+ if (x0 > x1) {
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+ intSwap(&x0, &x1); }
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+
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+ if ( ((y < 0) || (y > windowHeight)) ||
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+ ((x0 < 0) && (x1 < 0)) ||
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+ ((x0 > windowWidth) && (x1 > windowWidth)) )
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+ {
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+ return;
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+ }
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+
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+ x0 = MAX(0, x0);
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+ x1 = MIN(x1, (windowWidth - 1));
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+
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+ uint32_t *currentPos = &frameBuffer[x0 + (y * windowWidth)];
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+
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+ for(i = x0; i <= x1; i++, currentPos++)
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+ {
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+ *currentPos = colour;
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+ }
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+}
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+
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+void clearFrameBuffer(colour_t colour)
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+{
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+ int32_t x;
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+ for (x = 0 ; x < windowWidth * windowHeight ; x++)
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+ {
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+ frameBuffer[x] = colour;
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+ }
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+}
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+
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+void clearZBuffer()
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+{
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+ int32_t x;
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+ if (doZBuffer)
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+ {
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+ for (x = 0 ; x < windowWidth * windowHeight ; x++)
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+ {
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+ zBuffer[x] = 1.0;
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+ }
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+ }
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+}
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+
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+void drawGrid(int spacing, colour_t colour)
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+{
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+ int32_t x, y;
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+ for (y = 0 ; y < windowHeight ; y++)
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+ {
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+ for (x = 0 ; x < windowWidth ; x++)
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+ {
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+ if (((x % spacing) == 0) || ((y % spacing) == 0))
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+ {
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+ frameBuffer[x + (y * windowWidth)] = colour;
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+ }
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+ }
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+ }
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+}
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+
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+void drawRectangle(int32_t x, int32_t y, int32_t w, int32_t h, colour_t colour)
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+{
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+ int32_t j;
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+
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+ for (j = 0 ; j < h ; j++)
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+ {
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+ drawHLine(x, y + j, x + w, colour);
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+ }
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+}
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+
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+/* FIXME: Some out of screen line may render weirdly. Will fix that later */
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+void drawLine(int32_t x0, int32_t y0, int32_t x1, int32_t y1, colour_t colour)
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+{
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+ int i;
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+ int32_t deltaX = x1 - x0;
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+ int32_t deltaY = y1 - y0;
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+
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+ int32_t sideLength = ( abs(deltaX) >= abs(deltaY) ) ? abs(deltaX) : abs(deltaY);
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+
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+ double incrementX = deltaX / (double)sideLength;
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+ double incrementY = deltaY / (double)sideLength;
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+
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+ if (deltaX == 0)
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+ {
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+ drawVLine(x0, y0, y1, colour);
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+ }
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+ else if (deltaY == 0)
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+ {
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+ drawHLine(x0, y0, x1, colour);
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+ }
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+ else
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+ {
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+ double currentX = x0;
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+ double currentY = y0;
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+
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+ for (i = 0 ; i < sideLength ; i++)
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+ {
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+ drawPixel(round(currentX), round(currentY), colour);
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+ currentX += incrementX;
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+ currentY += incrementY;
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+ }
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+ }
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+}
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+
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+static vec3_t barycentricWeights(vec2_t a, vec2_t b, vec2_t c, vec2_t p)
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+{
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+ vec2_t ab = vec2SubVectors(b, a);
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+ vec2_t bc = vec2SubVectors(c, b);
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+ vec2_t ac = vec2SubVectors(c, a);
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+ vec2_t ap = vec2SubVectors(p, a);
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+ vec2_t bp = vec2SubVectors(p, b);
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+ vec3_t ret;
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+
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+ double areaTriangleABC = (ab.x * ac.y) - (ab.y * ac.x);
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+
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+ double alpha = ((bc.x * bp.y) - (bp.x * bc.y)) / areaTriangleABC;
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+ double beta = ((ap.x * ac.y) - (ac.x * ap.y)) / areaTriangleABC;
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+ double gamma = 1 - alpha - beta;
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+
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+ ret.x = alpha;
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+ ret.y = beta;
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+ ret.z = gamma;
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+
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+ return ret;
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+}
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+
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+void drawZPixel(int32_t x, int32_t y, vec4_t a, vec4_t b, vec4_t c, colour_t colour)
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+{
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+ vec2_t pointP = { x, y };
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+ vec2_t a2 = vec2FromVec4(a);
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+ vec2_t b2 = vec2FromVec4(b);
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+ vec2_t c2 = vec2FromVec4(c);
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+
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+ if ((x < 0) || (y < 0) || (x > windowWidth) ||(y > windowHeight))
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+ {
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+ return;
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+ }
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+
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+ vec3_t weights = barycentricWeights(a2, b2, c2, pointP);
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+
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+ double alpha = weights.x;
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+ double beta = weights.y;
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+ double gamma = weights.z;
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+ double interpolatedReciprocalW;
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+
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+ interpolatedReciprocalW = (1 / a.w) * alpha + (1 / b.w) * beta + (1 / c.w) * gamma;
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+
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+ /* Inverse to get logical W invrementing going further to us */
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+ interpolatedReciprocalW = 1 - interpolatedReciprocalW;
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+ if (interpolatedReciprocalW < zBuffer[(windowWidth * y) + x])
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+ {
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+ drawPixel(x, y, colour);
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+
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+ /* Update Z Buffer */
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+ zBuffer[(windowWidth * y) + x] = interpolatedReciprocalW;
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+ }
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+}
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+
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+void drawTexel(int32_t x, int32_t y, vec4_t a, vec4_t b, vec4_t c, tex2_t ta, tex2_t tb, tex2_t tc, texture_t *texture)
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+{
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+ vec2_t pointP = { x, y };
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+ vec2_t a2 = vec2FromVec4(a);
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+ vec2_t b2 = vec2FromVec4(b);
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+ vec2_t c2 = vec2FromVec4(c);
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+
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+ if ((x < 0) || (y < 0) || (x > windowWidth) ||(y > windowHeight))
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+ {
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+ return;
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+ }
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+
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+ vec3_t weights = barycentricWeights(a2, b2, c2, pointP);
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+
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+ double alpha = weights.x;
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+ double beta = weights.y;
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+ double gamma = weights.z;
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+ double interpolatedU, interpolatedV, interpolatedReciprocalW;
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+ int32_t texX, texY;
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+
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+ interpolatedReciprocalW = (1 / a.w) * alpha + (1 / b.w) * beta + (1 / c.w) * gamma;
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+
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+ if (doPerspectiveCorrection)
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+ {
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+ interpolatedU = (ta.u / a.w) * alpha + (tb.u / b.w) * beta + (tc.u / c.w) * gamma;
|
|
|
+ interpolatedV = ((1 - ta.v) / a.w) * alpha + ((1 - tb.v) / b.w) * beta + ((1 - tc.v) / c.w) * gamma;
|
|
|
+
|
|
|
+
|
|
|
+ interpolatedU /= interpolatedReciprocalW;
|
|
|
+ interpolatedV /= interpolatedReciprocalW;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ interpolatedU = ta.u * alpha + tb.u * beta + tc.u * gamma;
|
|
|
+ interpolatedV = (1 - ta.v) * alpha + (1 - tb.v) * beta + (1 - tc.v) * gamma;
|
|
|
+ }
|
|
|
+
|
|
|
+ texX = abs((int32_t)(interpolatedU * texture->width));
|
|
|
+ texY = abs((int32_t)(interpolatedV * texture->height));
|
|
|
+
|
|
|
+ texX = texX % texture->width;
|
|
|
+ texY = texY % texture->height;
|
|
|
+
|
|
|
+ if (doZBuffer)
|
|
|
+ {
|
|
|
+ /* Inverse to get logical W invrementing going further to us */
|
|
|
+ interpolatedReciprocalW = 1 - interpolatedReciprocalW;
|
|
|
+ if (interpolatedReciprocalW < zBuffer[(windowWidth * y) + x])
|
|
|
+ {
|
|
|
+ drawPixel(x, y, texture->data[(texY * texture->width) + texX]);
|
|
|
+
|
|
|
+ /* Update Z Buffer */
|
|
|
+ zBuffer[(windowWidth * y) + x] = interpolatedReciprocalW;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ drawPixel(x, y, texture->data[(texY * texture->width) + texX]);
|
|
|
+ }
|
|
|
+}
|