2020-embedded-game-programming/src/main.c

#include "odroid/display.h"
#include "odroid/input.h"
#include "odroid/sdcard.h"
#include "macros.h"
#include <esp_log.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <string.h>


static const char* LOG_TAG = "Main";
static uint16_t gFramebuffer[LCD_WIDTH * LCD_HEIGHT];

void app_main(void)
{
	Odroid_InitializeInput();
	Odroid_InitializeDisplay();
	Odroid_InitializeSdcard();

	// Load sprite
	uint16_t* sprite = (uint16_t*)malloc(64 * 64 * sizeof(uint16_t));
	{
		FILE* spriteFile = fopen("/sdcard/key", "r");
		assert(spriteFile);

		for (int i = 0; i < 64; ++i)
		{
			for (int j = 0; j < 64; ++j)
			{
				fread(sprite, sizeof(uint16_t), 64 * 64, spriteFile);
			}
		}

		fclose(spriteFile);
	}


	ESP_LOGI(LOG_TAG, "Odroid initialization complete - entering main loop");

	int x = 0;
	int y = 0;

	uint16_t color = 0xffff;

	for (;;)
	{
		memset(gFramebuffer, 0, 320 * 240 * 2);

		Odroid_Input input = Odroid_PollInput();

		if (input.left) { x -= 20; }
		else if (input.right) { x += 20; }

		if (input.up) { y -= 20; }
		else if (input.down) { y += 20; }

		if (input.a) { color = SWAP_ENDIAN_16(RGB565(0xff, 0, 0)); }
		else if (input.b) { color = SWAP_ENDIAN_16(RGB565(0, 0xff, 0)); }
		else if (input.start) { color = SWAP_ENDIAN_16(RGB565(0, 0, 0xff)); }
		else if (input.select) { color = SWAP_ENDIAN_16(RGB565(0xff, 0xff, 0xff)); }

		int spriteRow = 0;
		int spriteCol = 0;

		for (int row = y; row < y + 64; ++row)
		{
			spriteCol = 0;

			for (int col = x; col < x + 64; ++col)
			{
				uint16_t pixelColor = sprite[64 * spriteRow + spriteCol];

				if (pixelColor != 0)
				{
					gFramebuffer[row * LCD_WIDTH + col] = color;
				}

				++spriteCol;
			}

			++spriteRow;
		}

		if (input.menu)
		{
			const char* snapFilename = "/sdcard/framebuf";

			ESP_LOGI(LOG_TAG, "Writing snapshot to %s", snapFilename);

			FILE* snapFile = fopen(snapFilename, "wb");
			assert(snapFile);

			fwrite(gFramebuffer, 1, LCD_WIDTH * LCD_HEIGHT * sizeof(gFramebuffer[0]), snapFile);

			fclose(snapFile);
		}

		Odroid_DrawFrame(gFramebuffer);
	}

	// Should never get here
	esp_restart();
}