Add tile grid and atlas concept to game

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);
-	shader_uniformSet1i(renderer->shader, "tex", 0);
-	glCheckError();
+
+	if (tex)
+	{
+		glBindTexture(GL_TEXTURE_2D, tex->id);
+		shader_uniformSet1i(renderer->shader, "tex", 0);
+	}
 
 	glBindVertexArray(renderer->vao);
 	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);