Add levelling

game.c

@@ -8,7 +8,6 @@
 #include <assert.h>
 #include <linux/input-event-codes.h>
 #include <math.h>
-#include <stdio.h>
 #include <string.h>
 
 #define SHIP_COLLIDE_R 0.05
@@ -17,14 +16,14 @@
 #define FIRE_MEAN -0.15
 #define FIRE_JITTER 0.01
 
+#define INIT_LEVEL 1
+
 #define ASTEROID_MIN_VERTS 5
 #define ASTEROID_MAX_VERTS 8
 #define ASTEROID_VERT_RANGE (ASTEROID_MAX_VERTS - ASTEROID_MIN_VERTS)
 #define ASTEROID_A_JITTER 0.8
 #define ASTEROID_VEL_JITTER 0.001
 #define ASTEROID_OMG_JITTER 0.005
-#define INIT_ASTEROIDS 1
-
 #define ASTEROID_SMALL 0.05f
 #define ASTEROID_MEDIUM 0.1f
 #define ASTEROID_LARGE 0.2f
@@ -54,6 +53,10 @@
 #define MAX_SHAPES_PER_ENTITY 2
 #define MAX_COLLISIONS 128U
 
+#define ARROW_SCALE 0.025
+#define ARROW_WIDTH 4
+#define ARROW_HEIGHT 4
+
 #define COUNTER_MASK (1 << 6)
 
 #define NELEMS(arr) (sizeof(arr) / sizeof(arr[0]))
@@ -103,6 +106,12 @@ static const vec2_t fire_verts[] = {
 };
 static const vec2_t shot_verts[] = { { 0.0, -0.02 }, { 0.0, 0.02 } };
 
+static const vec2_t arrow_verts[][MAX_VERTS] = {
+	{ { 1, 2 }, { 2, 0 }, { 1, -2 } },
+	{ { -2, 0 }, { 2, 0 } },
+};
+static const unsigned arrow_counts[NELEMS(arrow_verts)] = { 3, 2 };
+
 static entity_t entities[MAX_ENTITIES];
 static mat3_t transforms[MAX_ENTITIES];
 static shape_t shapes[MAX_SHAPES];
@@ -110,25 +119,22 @@ static shape_t shapes[MAX_SHAPES];
 static unsigned entity_count;
 static unsigned shape_count;
 
+static float aspect;
+static unsigned level;
+
 static bool dead;
 static unsigned asteroid_count;
-static float aspect;
 static uint8_t counter;
 
 static unsigned ship_entity_id;
 static unsigned ship_shape_id;
 static unsigned fire_shape_id;
 
-static void restart()
-{
-	game_init(aspect);
-}
-
 static entity_t *add_entity(unsigned *id_out)
 {
 	const unsigned id = entity_count++;
 	memset(entities + id, 0, sizeof(entity_t));
-	entities[id].dir = (mat2_t) { { 1, 0 }, { 0, 1 } };
+	entities[id].dir = MAT2_ID;
 	if (id_out != nullptr)
 		*id_out = id;
 	return entities + id;
@@ -340,20 +346,28 @@ static void bounce(collision_t c)
 	b->vel = vec2_add(b->vel, vec2_scale(n, vb2 - vb1));
 }
 
+static void cleared()
+{
+	renderer_set_wrap(false);
+}
+
 static void destroy_asteroid(entity_t *a, vec2_t shot_vel)
 {
 	a->dead = true;
 	--asteroid_count;
 
 	float r;
-	if (a->radius == ASTEROID_HUGE)
+	if (a->radius == ASTEROID_HUGE) {
 		r = ASTEROID_LARGE;
-	else if (a->radius == ASTEROID_LARGE)
+	} else if (a->radius == ASTEROID_LARGE) {
 		r = ASTEROID_MEDIUM;
-	else if (a->radius == ASTEROID_MEDIUM)
+	} else if (a->radius == ASTEROID_MEDIUM) {
 		r = ASTEROID_SMALL;
-	else
+	} else {
+		if (asteroid_count == 0)
+			cleared();
 		return;
+	}
 
 	const unsigned n = REPLACE_MIN + rng_uint32() % REPLACE_RANGE;
 	const float da = 2 * PI / n;
@@ -383,8 +397,6 @@ static void destroy_asteroid(entity_t *a, vec2_t shot_vel)
 
 		++asteroid_count;
 	}
-
-	printf("asteroid count: %u\n", asteroid_count);
 }
 
 static void handle_collisions(const collision_t *collisions, unsigned count)
@@ -423,12 +435,27 @@ static void handle_collisions(const collision_t *collisions, unsigned count)
 	}
 }
 
-void game_init(float _aspect)
+static void draw_arrow()
 {
-	input_on_shoot(shoot);
-	input_on_restart(restart);
+	const float tx = aspect - ARROW_SCALE * (ARROW_WIDTH / 2.0 + 2);
+	const mat3_t m = {
+		{ ARROW_SCALE, 0, 0 },
+		{ 0, ARROW_SCALE, 0 },
+		{ tx, 0, 1 },
+	};
 
-	aspect = _aspect;
+	const vec3_t c_mod = { 0, 0, 1 };
+	const vec3_t s_mod = { ARROW_WIDTH + 2, ARROW_HEIGHT + 2, 0 };
+	const vec3_t c = mat3_mul_vec3(m, c_mod);
+	const vec3_t s = mat3_mul_vec3(m, s_mod);
+	renderer_clear_rect(vec3_reduce(c), (vec2_t) { s.x, s.y });
+
+	for (unsigned i = 0; i < NELEMS(arrow_verts); ++i)
+		renderer_draw(arrow_verts[i], arrow_counts[i], m, false);
+}
+
+static void create_field()
+{
 	dead = false;
 	counter = 0;
 	entity_count = shape_count = 0;
@@ -450,19 +477,38 @@ void game_init(float _aspect)
 	fire->vert_count = NELEMS(fire_verts);
 	memcpy(fire->verts, fire_verts, sizeof(fire_verts));
 
-	for (unsigned i = 0; i < INIT_ASTEROIDS; ++i)
+	for (unsigned i = 0; i < level; ++i)
 		spawn_asteroid();
 }
 
+static void win()
+{
+	renderer_set_wrap(true);
+	++level;
+	create_field();
+}
+
+static void reset()
+{
+	level = INIT_LEVEL;
+	create_field();
+}
+
+void game_init(float _aspect)
+{
+	input_on_shoot(shoot);
+	input_on_restart(reset);
+	aspect = _aspect;
+
+	reset();
+}
+
 void game_update()
 {
-	if (dead) {
+	if (dead || asteroid_count == 0)
 		++counter;
+	if (dead)
 		return;
-	}
-
-	if (asteroid_count == 0 && counter <= COUNTER_MASK)
-		++counter;
 
 	ship_update();
 
@@ -472,6 +518,11 @@ void game_update()
 		e->dir = mat2_mul_mat2(mat2_rotation(e->omg), e->dir);
 		e->pos = vec2_add(e->pos, e->vel);
 
+		if (asteroid_count == 0 && i == ship_entity_id) {
+			if (e->pos.x > aspect)
+				win();
+		}
+
 		if (e->pos.y > 1)
 			e->pos.y -= 2;
 		else if (e->pos.y <= -1)
@@ -507,6 +558,9 @@ void game_draw()
 	if (dead && !(counter & COUNTER_MASK))
 		text_draw("GAME OVER");
 
-	if (asteroid_count == 0 && counter < COUNTER_MASK)
-		text_draw("CLEAR");
+	if (!dead && asteroid_count == 0) {
+		draw_arrow();
+		if (!(counter & COUNTER_MASK))
+			text_draw("CLEAR");
+	}
 }

maths.c

@@ -41,6 +41,11 @@ float vec2_dot(vec2_t v1, vec2_t v2)
 	return v1.x * v2.x + v1.y * v2.y;
 }
 
+vec2_t vec3_reduce(vec3_t v)
+{
+	return (vec2_t) { v.x / v.z, v.y / v.z };
+}
+
 mat2_t mat2_rotation(float theta)
 {
 	return (mat2_t) {

maths.h

@@ -3,6 +3,9 @@
 
 #define PI 3.14159265358979323846264
 
+#define MAT2_ID ((mat2_t) { { 1, 0 }, { 0, 1 } })
+#define MAT3_ID ((mat3_t) { { 1, 0, 0 }, { 0, 1, 0 }, { 0, 0, 1 } })
+
 typedef struct {
 	float x, y;
 } vec2_t;
@@ -27,6 +30,8 @@ vec3_t vec2_extend(vec2_t v);
 vec2_t vec2_norm(vec2_t v);
 float vec2_dot(vec2_t v1, vec2_t v2);
 
+vec2_t vec3_reduce(vec3_t v);
+
 mat2_t mat2_rotation(float theta);
 vec2_t mat2_mul_vec2(mat2_t m, vec2_t v);
 mat2_t mat2_mul_mat2(mat2_t m1, mat2_t m2);

renderer.c

@@ -20,6 +20,8 @@ static int front, back;
 static uint32_t width, height;
 static mat3_t view;
 
+static bool wrap;
+
 static vec3_t vert_buf[MAX_VERTS];
 
 static void page_flip_handler(int, unsigned, unsigned, unsigned, void *)
@@ -34,6 +36,13 @@ static void set_pixel(uint32_t x, uint32_t y)
 
 static void draw_line(vec3_t v1, vec3_t v2)
 {
+	v1.x /= v1.z;
+	v1.y /= v1.z;
+	v1.z = 1;
+	v2.x /= v2.z;
+	v2.y /= v2.z;
+	v2.z = 1;
+
 	const float delta_x = v2.x - v1.x;
 	const float delta_y = v2.y - v1.y;
 	const float step = fmaxf(fabsf(delta_x), fabsf(delta_y));
@@ -43,16 +52,20 @@ static void draw_line(vec3_t v1, vec3_t v2)
 
 		for (unsigned i = 0; i <= step; ++i) {
 			float x = roundf(v1.x + i * step_x);
-			if (x >= width)
-				x -= width;
-			else if (x < 0)
-				x += width;
-
 			float y = roundf(v1.y + i * step_y);
-			if (y >= height)
-				y -= height;
-			else if (y < 0)
-				y += height;
+
+			if (wrap) {
+				if (x >= width)
+					x -= width;
+				else if (x < 0)
+					x += width;
+				if (y >= height)
+					y -= height;
+				else if (y < 0)
+					y += height;
+			} else if (x >= width || x < 0 || y >= height || y < 0) {
+				continue;
+			}
 
 			set_pixel(x, y);
 		}
@@ -89,6 +102,8 @@ renderer_params_t renderer_init()
 	width = mode.hdisplay;
 	height = mode.vdisplay;
 
+	wrap = true;
+
 	const float aspect = (float)width / (float)height;
 	const float scale = (float)height / 2.0f;
 	view = (mat3_t) {
@@ -136,6 +151,11 @@ void renderer_swap()
 	back = (back + 1) & 1;
 }
 
+void renderer_set_wrap(bool enable)
+{
+	wrap = enable;
+}
+
 void renderer_clear()
 {
 	memset(fbs[back].buf, 0, fbs[back].size);

renderer.h

@@ -18,9 +18,9 @@ void renderer_cleanup();
 void renderer_handle();
 void renderer_swap();
 
+void renderer_set_wrap(bool enable);
 void renderer_clear();
 void renderer_clear_rect(vec2_t centre, vec2_t size);
-
 void renderer_draw(
     const vec2_t *vs, unsigned count, mat3_t model, bool connect);