Add tile grid and atlas concept to game

src/AssetManager.c

@@ -8,14 +8,20 @@ GLOBAL_VAR AssetManager assetManager;
 
 Texture *asset_getTexture(const enum TexList type)
 {
-	// NOTE(doyle): Since we're using a map, the count of an object can
-	// only be 1 or 0
 	if (type < texlist_count)
 		return &assetManager.textures[type];
 
 	return NULL;
 }
 
+TexAtlas *asset_getTextureAtlas(const enum TexList type)
+{
+	if (type < texlist_count)
+		return &assetManager.texAtlas[type];
+
+	return NULL;
+}
+
 const i32 asset_loadTextureImage(const char *const path, const enum TexList type)
 {
 	/* Open the texture image */

src/Renderer.c

@@ -2,16 +2,23 @@
 #include <Dengine/Renderer.h>
 
 void renderer_entity(Renderer *renderer, Entity *entity, f32 rotate, v3 color)
+{
+	renderer_object(renderer, entity->pos, entity->size, rotate, color,
+	                entity->tex);
+}
+
+void renderer_object(Renderer *renderer, v2 pos, v2 size, f32 rotate, v3 color,
+                     Texture *tex)
 {
 	shader_use(renderer->shader);
-	mat4 transMatrix  = mat4_translate(entity->pos.x, entity->pos.y, 0.0f);
+	mat4 transMatrix  = mat4_translate(pos.x, pos.y, 0.0f);
 	mat4 rotateMatrix = mat4_rotate(rotate, 0.0f, 0.0f, 1.0f);
 
 	// NOTE(doyle): We draw everything as a unit square in OGL. Scale it to size
 	// TODO(doyle): We should have a notion of hitbox size and texture size
 	// we're going to render so we can draw textures that may be bigger than the
 	// entity, (slightly) but keep a consistent bounding box
-	mat4 scaleMatrix = mat4_scale(entity->size.x, entity->size.y, 1.0f);
+	mat4 scaleMatrix = mat4_scale(size.x, size.y, 1.0f);
 
 	mat4 model = mat4_mul(transMatrix, mat4_mul(rotateMatrix, scaleMatrix));
 	shader_uniformSetMat4fv(renderer->shader, "model", model);
@@ -21,9 +28,12 @@ void renderer_entity(Renderer *renderer, Entity *entity, f32 rotate, v3 color)
 	// this->shader->uniformSetVec3f("spriteColor", color);
 
 	glActiveTexture(GL_TEXTURE0);
-	glBindTexture(GL_TEXTURE_2D, entity->tex->id);
+
+	if (tex)
+	{
+		glBindTexture(GL_TEXTURE_2D, tex->id);
 		shader_uniformSet1i(renderer->shader, "tex", 0);
-	glCheckError();
+	}
 
 	glBindVertexArray(renderer->vao);
 	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

src/WorldTraveller.c

@@ -32,11 +32,45 @@ void worldTraveller_gameInit(GameState *state)
 	/* Initialise assets */
 	asset_loadTextureImage(
 	    "data/textures/WorldTraveller/TerraSprite1024.png", texlist_hero);
+
+	asset_loadTextureImage(
+	    "data/textures/WorldTraveller/Terrain.png", texlist_terrain);
+	TexAtlas *terrainAtlas = asset_getTextureAtlas(texlist_terrain);
+	f32 atlasTileSize = 128.0f;
+	terrainAtlas->texRect[terraincoords_ground] =
+	    V4(384.0f, 512.0f, 384.0f + atlasTileSize, 512.0f + atlasTileSize);
+
 	asset_loadShaderFiles("data/shaders/sprite.vert.glsl",
 	                      "data/shaders/sprite.frag.glsl", shaderlist_sprite);
 	glCheckError();
 
 	state->state          = state_active;
+	state->tileSize       = 32;
+	state->currWorldIndex = 0;
+
+	/* Init world tiles */
+	i32 highestSquaredValue = 1;
+	while (squared(highestSquaredValue) < ARRAY_COUNT(state->world[0].tiles))
+		highestSquaredValue++;
+
+	const i32 worldSize = highestSquaredValue - 1;
+
+	// NOTE(doyle): Origin is center of the world
+	for (i32 i = 0; i < ARRAY_COUNT(state->world); i++)
+	{
+		for (i32 y = 0; y < worldSize; y++)
+		{
+			for (i32 x = 0; x < worldSize; x++)
+			{
+				i32 packedDimension = y * worldSize + x;
+				World *world = state->world;
+
+				world[i].texType = texlist_terrain;
+				world[i].tiles[packedDimension].pos =
+				    V2(CAST(f32) x, CAST(f32) y);
+			}
+		}
+	}
 
 	/* Init hero */
 	Entity heroEnt = {V2(0.0f, 0.0f),
@@ -268,9 +302,27 @@ void worldTraveller_gameUpdateAndRender(GameState *state, const f32 dt)
 	parseInput(state, dt);
 	glCheckError();
 
+	World *world         = &state->world[state->currWorldIndex];
+	TexAtlas *worldAtlas = asset_getTextureAtlas(world->texType);
+	Texture *worldTex    = asset_getTexture(world->texType);
+
+	f32 ndcFactor       = 1.0f / CAST(f32)worldTex->width;
+	for (i32 i = 0; i < ARRAY_COUNT(world->tiles); i++)
+	{
+		Tile tile = world->tiles[i];
+		v2 tileSize = V2(CAST(f32)state->tileSize, CAST(f32)state->tileSize);
+		v2 tilePosInPixel = v2_scale(tile.pos, tileSize.x);
+
+		v4 texNDC =
+		    v4_scale(worldAtlas->texRect[terraincoords_ground], ndcFactor);
+		updateBufferObject(state->renderer.vbo, texNDC);
+		renderer_object(&state->renderer, tilePosInPixel, tileSize, 0.0f,
+		                V3(0, 0, 0), worldTex);
+	}
+
 	// NOTE(doyle): Factor to normalise sprite sheet rect coords to -1, 1
 	Entity *hero  = &state->entityList[state->heroIndex];
-	f32 ndcFactor = 1.0f / CAST(f32) hero->tex->width;
+	ndcFactor = 1.0f / CAST(f32) hero->tex->width;
 
 	ASSERT(state->freeEntityIndex < ARRAY_COUNT(state->entityList));
 	for (i32 i = 0; i < state->freeEntityIndex; i++)

src/dengine.c

@@ -80,7 +80,6 @@ int main()
 	glCullFace(GL_BACK);
 
 	GameState worldTraveller = {0};
-	worldTraveller.state     = state_active;
 	worldTraveller.width     = CAST(i32)frameBufferSize.x;
 	worldTraveller.height    = CAST(i32)frameBufferSize.y;
 
@@ -94,7 +93,7 @@ int main()
 #if 0
 	// TODO(doyle): Get actual monitor refresh rate
 	i32 monitorRefreshHz      = 60;
-	f32 targetSecondsPerFrame = 1.0f / static_cast<f32>(monitorRefreshHz);
+	f32 targetSecondsPerFrame = 1.0f / CAST(f32)(monitorRefreshHz);
 #else
 	// TODO(doyle): http://gafferongames.com/game-physics/fix-your-timestep/
 	// NOTE(doyle): Prevent glfwSwapBuffer until a vertical retrace has
@@ -125,7 +124,7 @@ int main()
 		// TODO(doyle): Busy waiting, should sleep
 		while (secondsElapsed < targetSecondsPerFrame)
 		{
-			endTime        = static_cast<f32>(glfwGetTime());
+			endTime        = CAST(f32)(glfwGetTime());
 			secondsElapsed = endTime - startTime;
 		}
 #endif

src/include/Dengine/AssetManager.h

@@ -7,6 +7,7 @@
 enum TexList
 {
 	texlist_hero,
+	texlist_terrain,
 	texlist_count,
 };
 
@@ -16,10 +17,24 @@ enum ShaderList
 	shaderlist_count,
 };
 
+enum TerrainCoords
+{
+	terraincoords_ground,
+	terraincoords_count,
+};
+
+typedef struct TexAtlas
+{
+	// TODO(doyle): String hash based lookup
+	v4 texRect[16];
+
+} TexAtlas;
+
 // TODO(doyle): Switch to hash based lookup
 typedef struct AssetManager
 {
 	Texture textures[256];
+	TexAtlas texAtlas[256];
 	Shader shaders[256];
 } AssetManager;
 
@@ -27,6 +42,7 @@ extern AssetManager assetManager;
 
 /* Texture */
 Texture *asset_getTexture(const enum TexList type);
+TexAtlas *asset_getTextureAtlas(const enum TexList type);
 const i32 asset_loadTextureImage(const char *const path,
                                  const enum TexList type);
 

src/include/Dengine/Entity.h

@@ -37,7 +37,6 @@ typedef struct Entity
 	SpriteAnim anim[16];
 	i32 freeAnimIndex;
 	i32 currAnimIndex;
-
 } Entity;
 
 INTERNAL inline v4 getEntityScreenRect(Entity entity)

src/include/Dengine/Renderer.h

@@ -15,4 +15,7 @@ typedef struct Renderer
 void renderer_entity(Renderer *renderer, Entity *entity, f32 rotate,
                      v3 color);
 
+void renderer_object(Renderer *renderer, v2 pos, v2 size, f32 rotate, v3 color,
+                     Texture *tex);
+
 #endif

src/include/WorldTraveller/WorldTraveller.h

@@ -12,9 +12,20 @@ enum State
 {
 	state_active,
 	state_menu,
-	state_win
+	state_win,
 };
 
+typedef struct Tile
+{
+	v2 pos;
+} Tile;
+
+typedef struct World
+{
+	Tile tiles[2048];
+	enum TexList texType;
+} World;
+
 typedef struct GameState
 {
 	enum State state;
@@ -24,6 +35,10 @@ typedef struct GameState
 	Renderer renderer;
 	i32 heroIndex;
 
+	World world[4];
+	i32 currWorldIndex;
+	i32 tileSize;
+
 	// TODO(doyle): Make size of list dynamic
 	Entity entityList[256];
 	i32 freeEntityIndex;