Initial commit.

1 files changed, 244 insertions, 0 deletions

diff --git a/src/renderer.c b/src/renderer.c
new file mode 100644
index 0000000..c742e18
--- /dev/null
+++ b/src/renderer.c
@@ -0,0 +1,244 @@
+/*
+ * Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdbool.h>
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_ttf.h>
+
+#include "renderer.h"
+#include "screen.h"
+#include "game.h"
+
+void
+draw_clear(SDL_Renderer *renderer)
+{
+	SDL_SetRenderDrawColor(renderer,
+		COLOUR_BACKGROUND_R,
+		COLOUR_BACKGROUND_G,
+		COLOUR_BACKGROUND_B,
+		255);
+	SDL_RenderClear(renderer);
+}
+
+void
+draw_colour(SDL_Renderer *renderer, Snake_Colour colour)
+{
+	int r;
+	int g;
+	int b;
+
+	switch (colour) {
+		case SNAKE_FOREGROUND:
+			r = COLOUR_FOREGROUND_R;
+			g = COLOUR_FOREGROUND_G;
+			b = COLOUR_FOREGROUND_B;
+			break;
+		case SNAKE_BACKGROUND:
+			r = COLOUR_BACKGROUND_R;
+			g = COLOUR_BACKGROUND_G;
+			b = COLOUR_BACKGROUND_B;
+			break;
+		case SNAKE_BACKGROUND_SHADE:
+			r = COLOUR_BACKGROUND_SHADE_R;
+			g = COLOUR_BACKGROUND_SHADE_G;
+			b = COLOUR_BACKGROUND_SHADE_B;
+			break;
+		case SNAKE_RED:
+			r = COLOUR_RED_R;
+			g = COLOUR_RED_G;
+			b = COLOUR_RED_B;
+			break;
+		case SNAKE_GREEN:
+			r = COLOUR_GREEN_R;
+			g = COLOUR_GREEN_G;
+			b = COLOUR_GREEN_B;
+			break;
+		case SNAKE_BLUE:
+			r = COLOUR_RED_R;
+			g = COLOUR_RED_G;
+			b = COLOUR_RED_B;
+			break;
+		case SNAKE_YELLOW:
+			r = COLOUR_RED_R;
+			g = COLOUR_RED_G;
+			b = COLOUR_RED_B;
+			break;
+		case SNAKE_MAGENTA:
+			r = COLOUR_RED_R;
+			g = COLOUR_RED_G;
+			b = COLOUR_RED_B;
+			break;
+		case SNAKE_CYAN:
+			r = COLOUR_RED_R;
+			g = COLOUR_RED_G;
+			b = COLOUR_RED_B;
+			break;
+		case SNAKE_WHITE:
+			r = COLOUR_RED_R;
+			g = COLOUR_RED_G;
+			b = COLOUR_RED_B;
+			break;
+		case SNAKE_BLACK:
+			r = COLOUR_RED_R;
+			g = COLOUR_RED_G;
+			b = COLOUR_RED_B;
+			break;
+		default:
+			break;
+	}
+
+	SDL_SetRenderDrawColor(renderer,
+		r,
+		g,
+		b,
+		255);
+}
+
+void
+draw_text(SDL_Renderer *renderer, TTF_Font *font,
+	int text_x, int text_y, char *text,
+	bool centre, bool select, SDL_Color fg, SDL_Color bg,
+	Snake_Text *message)
+{
+	if (!message->cache) {
+		if (message->texture != NULL)
+			SDL_DestroyTexture(message->texture);
+
+		SDL_Surface *surface =
+			TTF_RenderUTF8_Shaded(font, text, fg, bg);
+		message->texture =
+			SDL_CreateTextureFromSurface(renderer, surface);
+		SDL_FreeSurface(surface);
+
+		message->pos.x = text_x;
+		message->pos.y = text_y;
+		TTF_SizeText(font, text, &message->pos.w, &message->pos.h);
+		if (centre)
+			message->pos.x -= message->pos.w / 2;
+		message->pos.y -= message->pos.h;
+
+		message->cache = 1;
+	}
+
+	SDL_RenderCopy(renderer, message->texture, NULL, &message->pos);
+
+	if (select) {
+		SDL_SetRenderDrawColor(renderer,
+			COLOUR_FOREGROUND_R,
+			COLOUR_FOREGROUND_G,
+			COLOUR_FOREGROUND_B,
+			255);
+		SDL_RenderDrawLine(renderer,
+			message->pos.x, message->pos.y,
+			message->pos.x, message->pos.y + message->pos.h);
+		SDL_RenderDrawLine(renderer,
+			message->pos.x, message->pos.y,
+			message->pos.x + message->pos.w, message->pos.y);
+		SDL_RenderDrawLine(renderer,
+			message->pos.x, message->pos.y + message->pos.h,
+			message->pos.x + message->pos.w,
+				message->pos.y + message->pos.h);
+		SDL_RenderDrawLine(renderer,
+			message->pos.x + message->pos.w, message->pos.y,
+			message->pos.x + message->pos.w,
+				message->pos.y + message->pos.h);
+	}
+}
+
+void
+draw_wall(SDL_Renderer *renderer)
+{
+	SDL_RenderDrawLine(renderer,
+		0, 0,
+		0, SCREEN_HEIGHT);
+	SDL_RenderDrawLine(renderer,
+		0, 0,
+		SCREEN_HEIGHT, 0);
+	SDL_RenderDrawLine(renderer,
+		0, SCREEN_HEIGHT - 1,
+		SCREEN_HEIGHT, SCREEN_HEIGHT - 1);
+	SDL_RenderDrawLine(renderer,
+		SCREEN_HEIGHT, 0,
+		SCREEN_HEIGHT, SCREEN_HEIGHT);
+}
+
+void
+draw_snake(SDL_Renderer *renderer, Snake_Pos **snake)
+{
+	Snake_Pos *ptr = *snake;
+
+	SDL_Rect pos;
+	while (ptr != NULL) {
+		pos.x = ptr->x;
+		pos.y = ptr->y;
+		pos.w = SCREEN_UNIT;
+		pos.h = SCREEN_UNIT;
+		SDL_RenderFillRect(renderer, &pos);
+		ptr = ptr->next;
+	}
+}
+
+void
+draw_fruit(SDL_Renderer *renderer, int *fruit)
+{
+	int rx = fruit[0] + SCREEN_UNIT / 2;
+	int ry = fruit[1] + SCREEN_UNIT / 2;
+
+	/* Midpoint circle algorithm */
+	int x = SCREEN_UNIT / 2;
+	int y = 0;
+	int dx = 1;
+	int dy = 1;
+	int err = dx - ((SCREEN_UNIT / 2) << 1);
+	while (x >= y) {
+		SDL_RenderDrawLine(renderer,
+			rx - y, ry + x,
+			rx + y, ry + x);
+		SDL_RenderDrawLine(renderer,
+			rx - x, ry + y,
+			rx + x, ry + y);
+		SDL_RenderDrawLine(renderer,
+			rx - x, ry - y,
+			rx + x, ry - y);
+		SDL_RenderDrawLine(renderer,
+			rx - y, ry - x,
+			rx + y, ry - x);
+
+		if (err <= 0) {
+			y++;
+			err += dy;
+			dy += 2;
+		}
+
+		if (err > 0) {
+			x--;
+			dx += 2;
+			err += dx - ((SCREEN_UNIT / 2) << 1);
+		}
+	}
+}
+
+void
+draw_pipe(SDL_Renderer *renderer, Snake_Pos **pipe)
+{
+	Snake_Pos *ptr = *pipe;
+
+	SDL_Rect pos;
+	while (ptr != NULL) {
+		pos.x = ptr->x;
+		pos.y = 0;
+		pos.w = SCREEN_UNIT;
+		if (ptr->x + SCREEN_UNIT > SCREEN_HEIGHT)
+			pos.w -= ptr->x + SCREEN_UNIT - SCREEN_HEIGHT;
+		pos.h = ptr->y - PIPE_GAP / 2 * SCREEN_UNIT;
+		SDL_RenderFillRect(renderer, &pos);
+		pos.y = ptr->y + PIPE_GAP / 2 * SCREEN_UNIT;
+		pos.h = SCREEN_HEIGHT - ptr->y - SCREEN_UNIT;
+		SDL_RenderFillRect(renderer, &pos);
+		ptr = ptr->next;
+	}
+}