chip8

commit b4bac86de9542e7a766bb651aecbb4cf4d98cb1f
parent e9d61759016eaeb42814ece7ad79f83dd7aafe65
Author: Léo Villeveygoux <l@vgx.fr>
Date:   Mon,  6 Apr 2020 18:41:38 +0200

Add raylib based media handling

Diffstat:
A
build.raylib.sh
 | 
1
+
A
media-raylib.c
 | 
141
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 142 insertions(+), 0 deletions(-)
diff --git a/build.raylib.sh b/build.raylib.sh
@@ -0,0 +1 @@
+gcc chip8.c media-raylib.c -o chip8 $(pkg-config --libs raylib)
diff --git a/media-raylib.c b/media-raylib.c
@@ -0,0 +1,141 @@
+#include <assert.h>
+#include <string.h>
+
+#include <raylib.h>
+
+#include "media.h"
+
+#define PIXEL_RADIUS 16
+
+#define SCREEN_WIDTH (64*PIXEL_RADIUS)
+#define SCREEN_HEIGHT (32*PIXEL_RADIUS)
+
+#define WINDOW_NAME "CHIP-8 emulator"
+
+#define BG_COLOR BLACK
+#define FG_COLOR WHITE
+
+#define SOUND_DEV_FREQ 48000
+#define SOUND_SAMPLES 4096
+#define BUZZER_FREQ 440
+#define BUZZER_VOL .05
+
+int buzzer_state;
+AudioStream audio;
+
+/*
+┌───┬───┬───┬───┐
+│ 1 │ 2 │ 3 │ C │
+├───┼───┼───┼───┤
+│ 4 │ 5 │ 6 │ D │
+├───┼───┼───┼───┤
+│ 7 │ 8 │ 9 │ E │
+├───┼───┼───┼───┤
+│ A │ 0 │ B │ F │
+└───┴───┴───┴───┘
+*/
+
+KeyboardKey keys[16] = {
+	KEY_V,
+	KEY_THREE, KEY_FOUR, KEY_FIVE,
+	KEY_E, KEY_R, KEY_T,
+	KEY_D, KEY_F, KEY_G,
+	KEY_C, KEY_B,
+	KEY_SIX, KEY_Y, KEY_H, KEY_N
+};
+
+static void update_audio(void){
+	static bool should_buzz = 0;
+	static long sample_num = 0;
+	static char audio_buffer[SOUND_SAMPLES];
+
+	if (buzzer_state)
+		should_buzz = 1;
+
+	if (IsAudioStreamProcessed(audio)){
+		for(int i=0 ; i<SOUND_SAMPLES ; i++){
+			if (should_buzz)
+				audio_buffer[i] =
+					((sample_num++*256*BUZZER_FREQ/SOUND_DEV_FREQ)
+					 %256)*BUZZER_VOL;
+			else
+				audio_buffer[i] = 0;
+		}
+		UpdateAudioStream(audio, audio_buffer, SOUND_SAMPLES);
+		should_buzz = 0;
+	}
+}
+
+int m_init(int argc, char **argv){
+	(void)argc, (void)argv;
+
+	InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, WINDOW_NAME);
+	SetTargetFPS(60);
+
+	InitAudioDevice();
+	audio = InitAudioStream(SOUND_DEV_FREQ, 8, 1);
+
+	PlayAudioStream(audio);
+
+	BeginDrawing();
+
+	return 0;
+}
+
+void m_quit(void){
+	EndDrawing();
+
+	CloseAudioStream(audio);
+	CloseAudioDevice();
+	
+	CloseWindow();
+}
+
+unsigned short get_input(unsigned short input){
+	if (WindowShouldClose())
+		return -1;
+
+	input = 0;
+
+	for(int i=0 ; i<16 ; i++){
+		if(IsKeyDown(keys[i]))
+			input |= 1<<i;
+	}
+
+	return input;
+}
+unsigned short wait_input(unsigned short input){
+	int new_input;
+	
+	while((new_input = get_input(input)) == input)
+		send_draw();
+
+	return new_input;
+}
+
+void clear_screen(void){
+	ClearBackground(BG_COLOR);
+}
+
+void draw(int x, int y, int value){
+	assert(0<=x && x<64);
+	assert(0<=y && y<32);
+	DrawRectangle(x*PIXEL_RADIUS, y*PIXEL_RADIUS,
+			PIXEL_RADIUS, PIXEL_RADIUS,
+			value ? FG_COLOR : BG_COLOR);
+}
+
+void send_draw(void){
+	update_audio();
+
+	EndDrawing();
+	BeginDrawing();
+}
+
+void set_buzzer_state(int state){
+	buzzer_state = state;
+}
+
+void wait_tick(void){
+	//XXX: not used anymore
+}