add "power meter"

Makefile

@@ -4,9 +4,9 @@ CFLAGS=-I$(IDIR) -Wall -ansi -g
 
 SRCDIR=src
 ODIR=obj
-LIBS=-lallegro -lallegro_audio -lallegro_acodec -lallegro_image -lallegro_font -lallegro_main -lallegro_ttf -lm
+LIBS=-lallegro -lallegro_audio -lallegro_acodec -lallegro_image -lallegro_font -lallegro_main -lallegro_ttf -lallegro_primitives -lm
 
-_OBJ = config.o main.o about.o intro.o loading.o map.o menu.o level.o moonwalk.o pause.o timeline.o 
+_OBJ = config.o main.o about.o intro.o loading.o map.o menu.o level.o moonwalk.o pause.o timeline.o allegro_utils.o 
 OBJ = $(patsubst %,$(ODIR)/%,$(_OBJ))
 
 OUTPUTDIR = bin

src/allegro_utils.c

@@ -0,0 +1,24 @@
+#include "allegro_utils.h"
+
+void al_draw_vertical_gradient_rect(float x, float y, float w, float h, ALLEGRO_COLOR top, ALLEGRO_COLOR bottom) {
+	ALLEGRO_VERTEX v[] = {
+		{.x = x, .y = y, .z = 0, .color = top},
+		{.x = x + w, .y = y, .z = 0, .color = top},
+		{.x = x, .y = y + h, .z = 0, .color = bottom},
+		{.x = x + w, .y = y + h, .z = 0, .color = bottom}};
+		al_draw_prim(v, NULL, NULL, 0, 4, ALLEGRO_PRIM_TRIANGLE_STRIP);
+}
+
+void al_draw_horizontal_gradient_rect(float x, float y, float w, float h, ALLEGRO_COLOR left, ALLEGRO_COLOR right) {
+	ALLEGRO_VERTEX v[] = {
+		{.x = x, .y = y, .z = 0, .color = left},
+		{.x = x + w, .y = y, .z = 0, .color = right},
+		{.x = x, .y = y + h, .z = 0, .color = left},
+		{.x = x + w, .y = y + h, .z = 0, .color = right}};
+		al_draw_prim(v, NULL, NULL, 0, 4, ALLEGRO_PRIM_TRIANGLE_STRIP);
+}
+
+void al_draw_text_with_shadow(ALLEGRO_FONT *font, ALLEGRO_COLOR color, float x, float y, int flags, char const *text) {
+	al_draw_text(font, al_map_rgba(0,0,0,128), x+1, y+1, flags, text);
+	al_draw_text(font, color, x, y, flags, text);
+}

src/allegro_utils.h

@@ -0,0 +1,7 @@
+#include <allegro5/allegro.h>
+#include <allegro5/allegro_primitives.h>
+#include <allegro5/allegro_font.h>
+
+void al_draw_vertical_gradient_rect(float x, float y, float w, float h, ALLEGRO_COLOR top, ALLEGRO_COLOR bottom);
+void al_draw_horizontal_gradient_rect(float x, float y, float w, float h, ALLEGRO_COLOR left, ALLEGRO_COLOR right);
+void al_draw_text_with_shadow(ALLEGRO_FONT *font, ALLEGRO_COLOR color, float x, float y, int flags, char const *text);

src/level.c

@@ -113,10 +113,24 @@ bool Move(struct Game *game, struct TM_Action *action, enum TM_ActionState state
 	return true;
 }
 
+bool ShowMeter(struct Game *game, struct TM_Action *action, enum TM_ActionState state) {
+	if (state != TM_ACTIONSTATE_RUNNING) return false;
+	game->level.meter_alpha+=tps(game, 60*3);
+	if (game->level.meter_alpha>=255) {
+		game->level.meter_alpha=255;
+		return true;
+	}
+	return false;
+}
+
 bool Fly(struct Game *game, struct TM_Action *action, enum TM_ActionState state) {
 	if (state == TM_ACTIONSTATE_INIT) action->arguments = NULL;
 	if (state != TM_ACTIONSTATE_RUNNING) return false;
-	if (!(action->arguments)) { SelectDerpySpritesheet(game, "fly"); game->level.flying = true; }
+	if (!(action->arguments)) {
+		SelectDerpySpritesheet(game, "fly");
+		game->level.flying = true;
+		TM_AddBackgroundAction(&ShowMeter, NULL, 0, "showmeter");
+	}
 	action->arguments++;
 	game->level.derpy_y-=tps(game, 60*0.004);
 	if (game->level.derpy_y>0.2) return false;
@@ -312,6 +326,11 @@ void Level_Draw(struct Game *game) {
 		if (game->level.cl_pos >= 1) game->level.cl_pos=game->level.cl_pos-1;
 		al_hold_bitmap_drawing(false);
 
+		al_set_target_bitmap(game->level.meter_bmp);
+		al_draw_horizontal_gradient_rect(0, 0, al_get_bitmap_width(game->level.meter_bmp), al_get_bitmap_height(game->level.meter_bmp), al_map_rgb(255,0,0), al_map_rgb(0,255,0));
+		al_set_target_bitmap(al_get_backbuffer(game->display));
+		al_draw_tinted_bitmap(game->level.meter_bmp, al_map_rgba(game->level.meter_alpha,game->level.meter_alpha,game->level.meter_alpha,game->level.meter_alpha), al_get_display_width(game->display)*0.75, al_get_display_height(game->display)*0.925, 0);
+
 		TM_Process();
 	}
 }
@@ -430,6 +449,7 @@ void Level_Load(struct Game *game) {
 	game->level.handle_input = false;
 	game->level.obstracles = NULL;
 	game->level.flying = false;
+	game->level.meter_alpha=0;
 	al_clear_to_color(al_map_rgb(0,0,0));
 	if (game->level.current_level!=1) Moonwalk_Load(game);
 	else {
@@ -555,6 +575,7 @@ void Level_UnloadBitmaps(struct Game *game) {
 		al_destroy_bitmap(game->level.clouds);
 		al_destroy_bitmap(game->level.welcome);
 		al_destroy_bitmap(game->level.obst_bmps.pie);
+		al_destroy_bitmap(game->level.meter_bmp);
 	}
 }
 
@@ -582,5 +603,7 @@ void Level_PreloadBitmaps(struct Game *game) {
 		al_draw_text_with_shadow(game->menu.font_title, al_map_rgb(255,255,255), al_get_display_width(game->display)*0.5, al_get_display_height(game->display)*0.1, ALLEGRO_ALIGN_CENTRE, "Level 1");
 		al_draw_text_with_shadow(game->menu.font_subtitle, al_map_rgb(255,255,255), al_get_display_width(game->display)*0.5, al_get_display_height(game->display)*0.275, ALLEGRO_ALIGN_CENTRE, "Fluttershy");
 		al_set_target_bitmap(al_get_backbuffer(game->display));
+
+		game->level.meter_bmp = al_create_bitmap(al_get_display_width(game->display)*0.2, al_get_display_height(game->display)*0.025);
 	}
 }

src/main.c

@@ -60,11 +60,6 @@
 double old_time = 0, fps;
 int frames_done = 0;
 
-void al_draw_text_with_shadow(ALLEGRO_FONT *font, ALLEGRO_COLOR color, float x, float y, int flags, char const *text) {
-	al_draw_text(font, al_map_rgba(0,0,0,128), x+1, y+1, flags, text);
-	al_draw_text(font, color, x, y, flags, text);
-}
-
 void PrintConsole(struct Game *game, char* format, ...) {
 	va_list vl;
 	va_start(vl, format);
@@ -329,6 +324,11 @@ int main(int argc, char **argv){
 		return -1;
 	}
 
+	if(!al_init_primitives_addon()){
+		fprintf(stderr, "failed to initialize primitives!\n");
+		return -1;
+	}
+	
 /*	if (!al_reserve_samples(10)){
 		fprintf(stderr, "failed to reserve samples!\n");
 		return -1;

src/main.h

@@ -29,6 +29,7 @@
 #include <allegro5/allegro_image.h>
 #include <allegro5/allegro_font.h>
 #include <allegro5/allegro_ttf.h>
+#include "allegro_utils.h"
 
 struct Game;
 
@@ -77,6 +78,7 @@ struct Level {
 	float derpy_x, derpy_y;
 	bool handle_input;
 	bool flying;
+	float meter_alpha;
 	int sheet_rows, sheet_cols, sheet_pos, sheet_blanks;
 	float sheet_tmp, sheet_speed, sheet_speed_modifier;
 	ALLEGRO_SAMPLE *sample; /*!< Sample with background music. */
@@ -86,6 +88,7 @@ struct Level {
 	ALLEGRO_BITMAP *welcome;
 	ALLEGRO_BITMAP **derpy_sheet; /*!< Active Derpy sprite sheet. */
 	ALLEGRO_BITMAP *derpy; /*!< Derpy sprite. */
+	ALLEGRO_BITMAP *meter_bmp;
 	struct Spritesheet* derpy_sheets; /*!< List of sprite sheets of Derpy character. */
 	struct Spritesheet* pony_sheets; /*!< List of sprite sheets of character rescued by Derpy. */
 	struct {