Batch tiles to single vbo at render pass

src/include/Dengine/Entity.h

@@ -39,15 +39,21 @@ typedef struct Entity
 	i32 currAnimIndex;
 } Entity;
 
-INTERNAL inline v4 getEntityScreenRect(Entity entity)
+INTERNAL inline v4 getRect(v2 origin, v2 size)
 {
-	v2 entityUpperLeftBound  = v2_add(entity.pos, V2(0.0f, entity.size.y));
-	v2 entityLowerRightBound = v2_add(entity.pos, V2(entity.size.x, 0.0f));
+	v2 upperLeftBound  = v2_add(origin, V2(0.0f, size.y));
+	v2 lowerRightBound = v2_add(origin, V2(size.x, 0.0f));
 
-	v4 result = V4(entityUpperLeftBound.x, entityUpperLeftBound.y,
-	               entityLowerRightBound.x, entityLowerRightBound.y);
+	v4 result = V4(upperLeftBound.x, upperLeftBound.y, lowerRightBound.x,
+	               lowerRightBound.y);
 
 	return result;
 }
 
+INTERNAL inline v4 getEntityScreenRect(Entity entity)
+{
+	v4 result = getRect(entity.pos, entity.size);
+	return result;
+}
+
 #endif

src/include/Dengine/Renderer.h

@@ -10,12 +10,38 @@ typedef struct Renderer
 	Shader *shader;
 	GLuint vao;
 	GLuint vbo;
+	i32 numVertexesInVbo;
 } Renderer;
 
+typedef struct RenderQuad
+{
+	v4 vertex[4];
+} RenderQuad;
+
 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);
 
+INTERNAL inline RenderQuad renderer_createQuad(v4 quadRectNdc, v4 texRectNdc)
+{
+	// NOTE(doyle): Draws a series of triangles (three-sided polygons) using
+	// vertices v0, v1, v2, then v2, v1, v3 (note the order)
+	RenderQuad result = {0};
+	result.vertex[0] = V4(quadRectNdc.x, quadRectNdc.y, texRectNdc.x, texRectNdc.y); // Top left
+	result.vertex[1] = V4(quadRectNdc.x, quadRectNdc.w, texRectNdc.x, texRectNdc.w); // Bottom left
+	result.vertex[2] = V4(quadRectNdc.z, quadRectNdc.y, texRectNdc.z, texRectNdc.y); // Top right
+	result.vertex[3] = V4(quadRectNdc.z, quadRectNdc.w, texRectNdc.z, texRectNdc.w); // Bottom right
+	return result;
+}
+
+INTERNAL inline RenderQuad renderer_createDefaultQuad(v4 texRectNdc)
+{
+	RenderQuad result = {0};
+	v4 defaultVertices = V4(0.0f, 1.0f, 1.0f, 0.0f);
+	result = renderer_createQuad(defaultVertices, texRectNdc);
+	return result;
+}
+
 #endif