Tile animations for world and entities. Implemented a fire timer for monsters to limit their fire rate. Preliminary sound support.

draw.c

@@ -16,6 +16,7 @@ void Draw_World( SDL_Renderer* r ) {
 			dst.x = i * TILE_SIZE;
 			uint8_t til = gs->levels[gs->current_level].tiles[j * 100 + gs->view_x + i];
 			if ( til == 0 ) continue;
+			til = G_UpdateFrame( til, i );
 			SDL_RenderCopy( r, g_assets->tile_tx[til], NULL, &dst );
 		}
 	}
@@ -37,12 +38,13 @@ void Draw_Player( SDL_Renderer* r ) {
 	// grounded walk tile
 	else if ( gs->ps.on_ground ) {
 		til = gs->ps.last_dir >= 0 ? 53 : 57;
+		til += (gs->ps.tick/4) % 3;
 	}
 	// jump tile
 	else if ( gs->ps.do_jump || !gs->ps.on_ground )
 		til = gs->ps.last_dir >= 0 ? 67 : 68;
 	// dead
-	if ( gs->ps.dead_timer ) til = 129;
+	if ( gs->ps.dead_timer ) til = 129 + (gs->tick/4) % 4;
 
 	// render
 	// grounded debug
@@ -51,6 +53,10 @@ void Draw_Player( SDL_Renderer* r ) {
 		SDL_RenderDrawLine( r, dst.x, dst.y+dst.h, dst.x+dst.w, dst.y+dst.h );
 	}
 	SDL_RenderCopy( r, g_assets->tile_tx[til], NULL, &dst );
+	/*dst.w = TILE_SIZE; dst.h = TILE_SIZE;
+	dst.x = (gs->ps.tx - gs->view_x) * TILE_SIZE;
+	dst.y = gs->ps.ty * TILE_SIZE + TILE_SIZE;
+	SDL_RenderDrawRect( r, &dst );*/
 }
 
 // draw player bullet
@@ -66,6 +72,11 @@ void Draw_Bullet( SDL_Renderer* r ) {
 
 		// render
 		SDL_RenderCopy( r, g_assets->tile_tx[til], NULL, &dst );
+		/*SDL_SetRenderDrawColor( r, 255, 0, 255, 255 );
+		dst.w = TILE_SIZE; dst.h = TILE_SIZE;
+		dst.x = ((gs->ps.bullet_px / TILE_SIZE) - gs->view_x) * TILE_SIZE;
+		dst.y = (gs->ps.bullet_py / TILE_SIZE) * TILE_SIZE + TILE_SIZE;
+		SDL_RenderDrawRect( r, &dst );*/
 	}
 }
 
@@ -81,6 +92,7 @@ void Draw_Monsters( SDL_Renderer* r ) {
 			dst.y = TILE_SIZE + m->py;// - 10;
 			dst.w = 24; dst.h = 20;
 			til = m->dead_timer ? 129 : m->type;
+			til += (gs->tick / 3) % 4;
 			SDL_RenderCopy( r, g_assets->tile_tx[til], NULL, &dst );
 		}
 	}
@@ -94,10 +106,16 @@ void Draw_MonsterBullet( SDL_Renderer* r ) {
 		dst.y = TILE_SIZE + gs->mbullet_py;
 		// tile 127 right, 128 left
 		uint8_t til = gs->mbullet_dir > 0 ? 121 : 124;
+		til += (gs->tick / 3) % 3;
 		dst.w = 20; dst.h = 3;
 
 		// render
 		SDL_RenderCopy( r, g_assets->tile_tx[til], NULL, &dst );
+		/*SDL_SetRenderDrawColor( r, 255, 0, 255, 255 );
+		dst.w = TILE_SIZE; dst.h = TILE_SIZE;
+		dst.x = ((gs->mbullet_px / TILE_SIZE) - gs->view_x) * TILE_SIZE;
+		dst.y = (gs->mbullet_py / TILE_SIZE) * TILE_SIZE + TILE_SIZE;
+		SDL_RenderDrawRect( r, &dst );*/
 	}
 }
 

game.c

@@ -1,6 +1,7 @@
 #include "game.h"
 #include "world.h"
 #include "draw.h"
+#include "sound.h"
 
 // global game state
 game_state_t* gs = NULL;
@@ -50,8 +51,8 @@ static void G_InitAssets( SDL_Renderer* r ) {
 	Util_FreeTileSurfaces();
 
 	// sfx
-	//g_assets->sfx[0] = S_LoadChunk( "res/jumpd8.wav" ); //Mix_LoadWAV_RW( rw, 1 );
-	//g_assets->sfx[1] = S_LoadChunk( "res/pickupd8.wav" ); //Mix_LoadWAV_RW( rw, 1 );
+	//g_assets->sfx[SFX_JUMP] = S_LoadChunk( "res/jumpd8.wav" ); //Mix_LoadWAV_RW( rw, 1 );
+	//g_assets->sfx[SFX_PICKUP] = S_LoadChunk( "res/pickupd8.wav" ); //Mix_LoadWAV_RW( rw, 1 );
 }
 
 // poll input
@@ -136,6 +137,17 @@ static void G_Update() {
 	G_ClearInput();
 }
 
+// update tile animation
+uint8_t G_UpdateFrame( uint8_t til, uint8_t salt ) {
+	uint8_t mod;
+	switch ( til ) {
+	case 6: case 25: case 129: mod = 4; break;
+	case 10: case 36: mod = 5; break;
+	default: mod = 1; break;
+	}
+	return til + (gs->tick/5+salt) % mod;
+}
+
 // main drawing routine
 static void G_Draw( SDL_Renderer* r ) {
 	// clear backbuffer
@@ -233,12 +245,12 @@ int main( int argc, char** argv ) {
 	// destroy each tile texture
 	for ( int i = 0; i < NUM_EXE_TILES; ++i )
 		SDL_DestroyTexture( g_assets->tile_tx[i] );
-	free( g_assets );
-	free( gs );
 	// free audio
-	//for ( int i = 0; i < sizeof(g_assets->sfx) / sizeof(g_assets->sfx[0]) )
+	//for ( int i = 0; i < NUM_SFX; ++i )
 		//Mix_FreeChunk( g_assets->sfx[i] );
 	//Mix_FreeMusic( g_assets->mus );
+	free( g_assets );
+	free( gs );
 	//Mix_CloseAudio();
 
 	// cleanup SDL

game.h

@@ -2,17 +2,18 @@
 #define _LMDAVE_H
 
 #include <SDL.h>
-//#include <SDL/SDL_mixer.h>
 
 // for dealing with resources in EXE
 #include "util/util.h"
 
+#include "sound.h"
 #include "player.h"
 #include "monster.h"
 
 // global game state
 typedef struct {
 	uint8_t quit;
+	uint16_t tick;
 	uint8_t current_level;
 	// view and scroll are per tile
 	uint8_t view_x, view_y;
@@ -35,7 +36,7 @@ typedef struct {
 	// tiles as textures converted from util's tile surfaces
 	SDL_Texture* tile_tx[NUM_EXE_TILES];
 	// sfx
-	//Mix_Chunk* sfx[2];
+	Mix_Chunk* sfx[NUM_SFX];
 	// music
 	//Mix_Music* mus;
 } game_assets_t;
@@ -45,4 +46,9 @@ typedef struct {
 // fixed frame delay
 #define FRAME_DELAY 33
 
+// common functions
+// update a tile index based on game tick for animation
+uint8_t G_UpdateFrame( uint8_t til, uint8_t salt );
+
 #endif
+

monster.c

@@ -35,13 +35,14 @@ void M_Fire() {
 		for ( int i = 0; i < sizeof(gs->ms) / sizeof(gs->ms[0]); ++i ) {
 			monster_state_t* m = &gs->ms[i];
 			// assumed size of 24x20
-			if ( m->type && !m->dead_timer && W_IsVisible( m->px ) && W_IsClear( m->px+12, m->py+10, 0 ) ) {
+			if ( m->type && !m->dead_timer && W_IsVisible( m->px ) && W_IsClear( m->px+12, m->py+10, 0 ) && !m->fire_timer ) {
 				gs->mbullet_dir = gs->ps.px < m->px ? -1 : 1;
 				if ( gs->mbullet_dir == 1 )
 					gs->mbullet_px = m->px + 18;
 				if ( gs->mbullet_dir == -1 )
 					gs->mbullet_px = m->px - 10;
 				gs->mbullet_py = m->py + 10;
+				m->fire_timer = 15;
 			}
 		}
 	}

monster.h

@@ -5,6 +5,7 @@
 typedef struct {
 	uint8_t type; // type and tile index
 	uint8_t dead_timer;
+	uint8_t fire_timer;
 	uint8_t path_index; // current point in path
 	uint8_t tx, ty; // tile pos
 	int16_t px, py; // pixel pos

player.c

@@ -65,7 +65,7 @@ void P_PickupItem() {
 	gs->ps.check_pickup_x = 0;
 	gs->ps.check_pickup_y = 0;
 	// sfx
-	//Mix_PlayChannel( S_CHAN_PICKUP, g_assets->sfx[1], 0 );
+	//Mix_PlayChannel( S_CHAN_PICKUP, g_assets->sfx[SFX_PICKUP], 0 );
 }
 
 // update collision point clear flags
@@ -174,25 +174,29 @@ void P_Move() {
 		gs->ps.px += 2;
 		gs->ps.last_dir = 1;
 		gs->ps.do_right = 0;
+		gs->ps.tick++;
 	}
 	if ( gs->ps.do_left ) {
 		gs->ps.px -= 2;
 		gs->ps.last_dir = -1;
 		gs->ps.do_left = 0;
+		gs->ps.tick++;
 	}
 	// up and down
 	if ( gs->ps.do_up ) {
 		gs->ps.py -= 2;
 		gs->ps.do_up = 0;
+		gs->ps.tick++;
 	} else if ( gs->ps.do_down ) {
 		gs->ps.py += 2;
 		gs->ps.do_down = 0;
+		gs->ps.tick++;
 	// jump
 	} else if ( gs->ps.do_jump ) {
 		if ( !gs->ps.jump_timer ) {
 			gs->ps.jump_timer = 25;
 			//gs->ps.last_dir = 0;
-			//Mix_PlayChannel( S_CHAN_JUMP, g_assets->sfx[0], 0 );
+			//Mix_PlayChannel( S_CHAN_JUMP, g_assets->sfx[SFX_JUMP], 0 );
 		}
 
 		if ( gs->ps.col_point[0] && gs->ps.col_point[1] ) {

player.h

@@ -12,6 +12,7 @@ typedef struct {
 	uint8_t on_ground;
 	// last facing direction
 	int8_t last_dir;
+	uint16_t tick;
 
 	// input flags
 	uint8_t try_right;

sound.c

@@ -0,0 +1,18 @@
+#include "sound.h"
+
+
+// custom chunk loader for emscripten support
+Mix_Chunk* S_LoadChunk( const char* f ) {
+	SDL_RWops* rw = SDL_RWFromFile( f, "rb" );
+	int sz = SDL_RWsize( rw );
+	uint8_t* rwdat = malloc( sz );
+	SDL_RWread( rw, rwdat, 1, sz );
+	SDL_RWclose( rw );
+	rw = SDL_RWFromConstMem( rwdat, sz );
+	Mix_Chunk* chunk = Mix_LoadWAV_RW( rw, 1 );
+	SDL_RWclose( rw );
+	free( rwdat );
+	if ( chunk == NULL ) { printf( "Failed to load chunk %s!\n", f ); return NULL; }
+	return chunk;
+}
+

sound.h

@@ -0,0 +1,18 @@
+#ifndef __SOUND_H
+#define __SOUND_H
+
+#include <SDL.h>
+#include <SDL/SDL_mixer.h>
+
+// sfx names
+typedef enum {
+	SFX_JUMP,
+	SFX_PICKUP,
+	NUM_SFX
+} SFX_NAME;
+
+// custom chunk loader for emscripten support
+Mix_Chunk* S_LoadChunk( const char* f );
+
+#endif
+

world.c

@@ -109,6 +109,8 @@ uint8_t W_IsVisible( int16_t px ) {
 
 // level-wide state update
 void W_Update() {
+	// update world tick
+	gs->tick++;
 	// check if at door and has trophy
 	if ( gs->ps.check_door ) {
 		if ( gs->ps.trophy ) {
@@ -137,6 +139,7 @@ void W_Update() {
 	for ( int i = 0; i < sizeof(gs->ms) / sizeof(gs->ms[0]); ++i ) {
 		monster_state_t* m = &gs->ms[i];
 		if ( m->type ) {
+			if ( m->fire_timer ) m->fire_timer--;
 			if ( m->dead_timer ) {
 				m->dead_timer--;
 				if ( !m->dead_timer ) { m->type = 0; }