Introduces texture blending

- Makes indicator sprites transparent when the player is under them

src/main.c

@@ -787,7 +787,7 @@ render_game(void)
 		player_render_toplayer(gPlayer, gCamera);
 	}
 
-	map_render_top_layer(gMap, gCamera);
+	map_render_top_layer(gMap, gRoomMatrix, gCamera);
 
 	if (gPlayer->class == MAGE || gPlayer->class == PALADIN)
 		roommatrix_render_mouse_square(gRoomMatrix, gCamera);
@@ -885,7 +885,7 @@ run_menu(void)
 	SDL_RenderSetViewport(gRenderer, &menuViewport);
 	map_render(gMap, gCamera);
 	map_render_mid_layer(gMap, gCamera);
-	map_render_top_layer(gMap, gCamera);
+	map_render_top_layer(gMap, gRoomMatrix, gCamera);
 	roommatrix_render_lightmap(gRoomMatrix, gCamera);
 
 	SDL_RenderSetViewport(gRenderer, NULL);

src/map.c

@@ -358,13 +358,13 @@ map_render_mid_layer(Map *map, Camera *cam)
 }
 
 void
-map_render_top_layer(Map *map, Camera *cam)
+map_render_top_layer(Map *map, RoomMatrix *rm, Camera *cam)
 {
 	LinkedList *monsterItem = map->monsters;
 	while (monsterItem != NULL) {
 		Monster *monster = monsterItem->data;
 		monsterItem = monsterItem->next;
-		monster_render_top_layer(monster, cam);
+		monster_render_top_layer(monster, rm, cam);
 	}
 }
 

src/map.h

@@ -107,7 +107,7 @@ void
 map_render_mid_layer(Map*, Camera*);
 
 void
-map_render_top_layer(Map*, Camera*);
+map_render_top_layer(Map*, RoomMatrix*, Camera*);
 
 void
 map_set_current_room(Map*, Position*);

src/monster.c

@@ -680,7 +680,7 @@ monster_render(Monster *m, Camera *cam)
 }
 
 void
-monster_render_top_layer(Monster *m, Camera *cam)
+monster_render_top_layer(Monster *m, RoomMatrix *rm, Camera *cam)
 {
 	if (m->stats.hp <= 0)
 		return;
@@ -688,8 +688,16 @@ monster_render_top_layer(Monster *m, Camera *cam)
 	if (m->behaviour == ASSASSIN && m->state.current != AGRESSIVE)
 		return;
 
+	Position mPos = position_to_matrix_coords(&m->sprite->pos);
+	mPos.y -= 1;
+	if (rm->spaces[mPos.x][mPos.y].player) {
+		sprite_set_alpha(m->stateIndicator.sprite, 110);
+	}
 	if (m->stateIndicator.displayCount != 0)
 		sprite_render(m->stateIndicator.sprite, cam);
+	if (rm->spaces[mPos.x][mPos.y].player) {
+		sprite_set_alpha(m->stateIndicator.sprite, 255);
+	}
 }
 
 void

src/monster.h

@@ -87,7 +87,7 @@ void
 monster_render(Monster*, Camera*);
 
 void
-monster_render_top_layer(Monster*, Camera*);
+monster_render_top_layer(Monster*, RoomMatrix*, Camera*);
 
 void
 monster_hit(Monster*, unsigned int dmg);

src/sprite.c

@@ -94,6 +94,24 @@ sprite_set_texture(Sprite *s, Texture *t, int index)
 	s->textures[index] = t;
 }
 
+void
+sprite_set_blend_mode(Sprite *s, SDL_BlendMode mode)
+{
+	if (s->textures[0])
+		texture_set_blend_mode(s->textures[0], mode);
+	if (s->textures[1])
+		texture_set_blend_mode(s->textures[1], mode);
+}
+
+void
+sprite_set_alpha(Sprite *s, Uint8 alpha)
+{
+	if (s->textures[0])
+		texture_set_alpha(s->textures[0], alpha);
+	if (s->textures[1])
+		texture_set_alpha(s->textures[1], alpha);
+}
+
 void
 sprite_render(Sprite *s, Camera *cam)
 {

src/sprite.h

@@ -59,6 +59,12 @@ sprite_set_texture(Sprite *, Texture *, int index);
 void
 sprite_render(Sprite*, Camera*);
 
+void
+sprite_set_blend_mode(Sprite*, SDL_BlendMode);
+
+void
+sprite_set_alpha(Sprite*, Uint8);
+
 void
 sprite_destroy(Sprite *);
 

src/texture.c

@@ -223,6 +223,20 @@ texture_load_from_text_blended(Texture *t, const char * text, SDL_Color fg, SDL_
 	load_from_surface(t, surface, renderer);
 }
 
+void
+texture_set_blend_mode(Texture *t, SDL_BlendMode mode)
+{
+	assert(t->texture);
+	SDL_SetTextureBlendMode(t->texture, mode);
+}
+
+void
+texture_set_alpha(Texture *t, Uint8 alpha)
+{
+	assert(t->texture);
+	SDL_SetTextureAlphaMod(t->texture, alpha);
+}
+
 void 
 texture_render(Texture *texture, SDL_Rect *box, Camera *cam)
 {

src/texture.h

@@ -25,7 +25,7 @@
 #include "position.h"
 #include "camera.h"
 
-typedef struct {
+typedef struct Texture {
 	SDL_Texture *texture;
 	TTF_Font *font;
 	TTF_Font *outlineFont;
@@ -76,6 +76,12 @@ texture_load_from_text_blended(Texture*,
 					   SDL_Color,
 					   SDL_Renderer*);
 
+void
+texture_set_blend_mode(Texture*, SDL_BlendMode);
+
+void
+texture_set_alpha(Texture*, Uint8);
+
 void
 texture_render(Texture*, SDL_Rect*, Camera*);