Additional debug string rendering infrastructure

Separate notion of rendering a static string, i.e. for debug display that
is absolutely positioned, and rendering of a regular string that moves
with the game camera.

src/AssetManager.c

@@ -48,6 +48,15 @@ const i32 asset_loadTextureImage(AssetManager *assetManager,
 	u8 *image =
 	    stbi_load(path, &imgWidth, &imgHeight, &bytesPerPixel, 0);
 
+#ifdef DENGINE_DEBUG
+	if (imgWidth != imgHeight)
+	{
+		printf(
+		    "worldTraveller_gameInit() warning: Sprite sheet is not square: "
+		    "%dx%dpx\n", imgWidth, imgHeight);
+	}
+#endif
+
 	if (!image)
 	{
 		printf("stdbi_load() failed: %s\n", stbi_failure_reason());

src/Debug.c

@@ -58,7 +58,7 @@ void debug_stringUpdateAndRender(Renderer *renderer, Font *font, f32 dt)
 	{
 		f32 rotate = 0;
 		v4 color   = V4(0, 0, 0, 1);
-		renderer_string(renderer, font, GLOBAL_debugState.debugStrings[i],
+		renderer_staticString(renderer, font, GLOBAL_debugState.debugStrings[i],
 		                      GLOBAL_debugState.stringPos, rotate, color);
 		GLOBAL_debugState.stringPos.y -=
 		    (0.9f * GLOBAL_debugState.stringLineGap);

src/Renderer.c

@@ -18,18 +18,33 @@ INTERNAL void updateBufferObject(Renderer *const renderer,
 	glBindBuffer(GL_ARRAY_BUFFER, 0);
 }
 
-void renderer_string(Renderer *const renderer, Font *const font,
+void renderer_string(Renderer *const renderer, v4 cameraBounds,
-                     const char *const string, v2 pos, f32 rotate,
+                     Font *const font, const char *const string, v2 pos,
-                     v4 color)
+                     f32 rotate, v4 color)
+{
+	i32 strLen       = common_strlen(string);
+	// TODO(doyle): Slightly incorrect string length in pixels calculation,
+	// because we use the advance metric of each character for length not
+	// maximum character size in rendering
+	v2 rightAlignedP =
+	    v2_add(pos, V2((CAST(f32) font->maxSize.w * CAST(f32) strLen),
+	                   CAST(f32) font->maxSize.h));
+	v2 leftAlignedP  = pos;
+	if ((leftAlignedP.x < cameraBounds.z && rightAlignedP.x >= cameraBounds.x) &&
+	    (leftAlignedP.y < cameraBounds.y && rightAlignedP.y >= cameraBounds.w))
 	{
 		i32 quadIndex           = 0;
-	i32 strLen = common_strlen(string);
 		RenderQuad *stringQuads = PLATFORM_MEM_ALLOC(strLen, RenderQuad);
 
+		v2 offsetFromCamOrigin    = V2(cameraBounds.x, cameraBounds.w);
+		v2 entityRelativeToCamera = v2_sub(pos, offsetFromCamOrigin);
+
+		pos          = entityRelativeToCamera;
 		f32 baseline = pos.y;
 		for (i32 i = 0; i < strLen; i++)
 		{
-		// NOTE(doyle): Atlas packs fonts tightly, so offset the codepoint to
+			// NOTE(doyle): Atlas packs fonts tightly, so offset the codepoint
+			// to
 			// its actual atlas index, i.e. we skip the first 31 glyphs
 			i32 codepoint          = string[i];
 			i32 relativeIndex      = codepoint - font->codepointRange.x;
@@ -45,8 +60,8 @@ void renderer_string(Renderer *const renderer, Font *const font,
 			v4 charTexRect = font->atlas->texRect[relativeIndex];
 			renderer_flipTexCoord(&charTexRect, FALSE, TRUE);
 
-		RenderQuad charQuad = renderer_createQuad(renderer, charRectOnScreen,
+			RenderQuad charQuad = renderer_createQuad(
-		                                          charTexRect, font->tex);
+			    renderer, charRectOnScreen, charTexRect, font->tex);
 			stringQuads[quadIndex++] = charQuad;
 		}
 
@@ -57,11 +72,11 @@ void renderer_string(Renderer *const renderer, Font *const font,
 		renderer_object(renderer, V2(0.0f, 0.0f), renderer->size, rotate, color,
 		                font->tex);
 		PLATFORM_MEM_FREE(stringQuads, strLen * sizeof(RenderQuad));
-
+	}
 }
 
-void renderer_entity(Renderer *renderer, v4 cameraBounds, Entity *entity, f32 dt, f32 rotate,
+void renderer_entity(Renderer *renderer, v4 cameraBounds, Entity *entity,
-                     v4 color)
+                     f32 dt, f32 rotate, v4 color)
 {
 	// TODO(doyle): Batch into render groups
 
@@ -101,7 +116,6 @@ void renderer_entity(Renderer *renderer, v4 cameraBounds, Entity *entity, f32 dt
 		renderer_object(renderer, entityRelativeToCamera, entity->size, rotate,
 		                color, entity->tex);
 	}
-
 }
 
 void renderer_object(Renderer *renderer, v2 pos, v2 size, f32 rotate, v4 color,

src/WorldTraveller.c

@@ -201,23 +201,13 @@ void worldTraveller_gameInit(GameState *state, v2i windowSize)
 	heroWalkRects[2]  = V4(849.0f, 1018.0f, 904.0f, 920.0f);
 	addAnim(hero, heroWalkRects, numRects, duration);
 
-	Texture *heroSheet = hero->tex;
-	v2 sheetSize = V2(CAST(f32) heroSheet->width, CAST(f32) heroSheet->height);
-	if (sheetSize.x != sheetSize.y)
-	{
-		printf(
-		    "worldTraveller_gameInit() warning: Sprite sheet is not square: "
-		    "%dx%dpx\n",
-		    CAST(i32) sheetSize.w, CAST(i32) sheetSize.h);
-	}
-
 	/* Create a NPC */
-	pos         = V2(300.0f, 300.0f);
+	pos         = V2((renderer->size.w / 3.0f), CAST(f32) state->tileSize);
 	size        = hero->size;
-	type        = entitytype_hero;
+	type        = entitytype_npc;
 	dir         = direction_null;
 	tex         = hero->tex;
-	collides    = TRUE;
+	collides    = FALSE;
 	Entity *npc = addEntity(world, pos, size, type, dir, tex, collides);
 
 	/* Add npc waving animation */
@@ -228,6 +218,32 @@ void worldTraveller_gameInit(GameState *state, v2i windowSize)
 	npcWavingRects[1]  = V4(944.0f, 812.0f, 1010.0f, 710.0f);
 	addAnim(npc, npcWavingRects, numRects, duration);
 
+	/* Create a Mob */
+	pos         = V2(renderer->size.w - (renderer->size.w / 3.0f),
+	                 CAST(f32) state->tileSize);
+	size        = hero->size;
+	type        = entitytype_mob;
+	dir         = direction_west;
+	tex         = hero->tex;
+	collides    = TRUE;
+	Entity *mob = addEntity(world, pos, size, type, dir, tex, collides);
+
+	/* Add mob idle animation */
+	duration         = 1.0f;
+	numRects         = 1;
+	v4 *mobIdleRects = PLATFORM_MEM_ALLOC(numRects, v4);
+	mobIdleRects[0]  = heroIdleRects[0];
+	addAnim(mob, mobIdleRects, numRects, duration);
+
+	/* Add mob walking animation */
+	duration         = 0.10f;
+	numRects         = 3;
+	v4 *mobWalkRects = PLATFORM_MEM_ALLOC(numRects, v4);
+	mobWalkRects[0]  = heroWalkRects[0];
+	mobWalkRects[1]  = heroWalkRects[1];
+	mobWalkRects[2]  = heroWalkRects[2];
+	addAnim(mob, mobWalkRects, numRects, duration);
+
 }
 
 INTERNAL void parseInput(GameState *state, const f32 dt)
@@ -406,18 +422,63 @@ void worldTraveller_gameUpdateAndRender(GameState *state, const f32 dt)
 
 	if (cameraBounds.w <= world->bounds.w) cameraBounds.w = world->bounds.w;
 
+	Font *font = &assetManager->font;
 	for (i32 i = 0; i < world->freeEntityIndex; i++)
 	{
 		Entity *const entity = &world->entities[i];
 		renderer_entity(&state->renderer, cameraBounds, entity, dt, 0.0f,
 		                V4(1, 1, 1, 1));
+
+#ifdef DENGINE_DEBUG
+		v4 color = V4(1, 1, 1, 1);
+		char *debugString = NULL;
+		switch(entity->type)
+		{
+			case entitytype_mob:
+				color = V4(1, 0, 0, 1);
+				debugString = "MOB";
+			    break;
+
+			case entitytype_hero:
+				color = V4(0, 0, 1.0f, 1);
+				debugString = "HERO";
+			    break;
+
+			case entitytype_npc:
+				color = V4(0, 1.0f, 0, 1);
+				debugString = "NPC";
+			    break;
+
+			default:
+			    break;
+		}
+
+		if (debugString)
+		{
+			v2 strPos = v2_add(entity->pos, entity->size);
+			i32 indexOfLowerAInMetrics = 'a' - font->codepointRange.x;
+			strPos.y += font->charMetrics[indexOfLowerAInMetrics].offset.y;
+
+			renderer_string(&state->renderer, cameraBounds, font, debugString,
+			                strPos, 0, color);
+
+			f32 stringLineGap = 1.1f * asset_getVFontSpacing(font->metrics);
+			strPos.y -= GLOBAL_debugState.stringLineGap;
+
+			char entityPosStr[256];
+			snprintf(entityPosStr, ARRAY_COUNT(entityPosStr), "%06.2f, %06.2f",
+			         entity->pos.x, entity->pos.y);
+			renderer_string(&state->renderer, cameraBounds, font, entityPosStr,
+			                strPos, 0, color);
+		}
+#endif
+
 	}
 
 	// TODO(doyle): Clean up lines
 	// Renderer::~Renderer() { glDeleteVertexArrays(1, &this->quadVAO); }
 
 #ifdef DENGINE_DEBUG
-	Font *font = &assetManager->font;
 	Entity *hero = &world->entities[world->heroIndex];
 	DEBUG_PUSH_STRING("Hero Pos: %06.2f, %06.2f", &hero->pos, "v2");
 	DEBUG_PUSH_STRING("Hero dPos: %06.2f, %06.2f", &hero->dPos, "v2");

src/include/Dengine/Entity.h

@@ -19,6 +19,7 @@ enum EntityType
 	entitytype_null,
 	entitytype_hero,
 	entitytype_npc,
+	entitytype_mob,
 	entitytype_tile,
 	entitytype_count,
 };

src/include/Dengine/Renderer.h

@@ -19,8 +19,17 @@ typedef struct RenderQuad
 	v4 vertex[4];
 } RenderQuad;
 
-void renderer_string(Renderer *const renderer, Font *const font,
+void renderer_string(Renderer *const renderer, v4 cameraBounds,
-                     const char *const string, v2 pos, f32 rotate, v4 color);
+                     Font *const font, const char *const string, v2 pos,
+                     f32 rotate, v4 color);
+
+inline void renderer_staticString(Renderer *const renderer, Font *const font,
+                                  const char *const string, v2 pos, f32 rotate,
+                                  v4 color)
+{
+	renderer_string(renderer, V4(0, renderer->size.h, renderer->size.w, 0),
+	                font, string, pos, rotate, color);
+}
 
 void renderer_entity(Renderer *renderer, v4 cameraBounds, Entity *entity,
                      f32 dt, f32 rotate, v4 color);