make use of new shader init interface in example

src/main.cpp

@@ -10,75 +10,50 @@ loadScene(RenderState* rs)
 	// TODO: come up with an easy to use interface for loading a model, setting
 	// 	up the buffer to attrib mappings, and initializing a render group
 
-	// NOTE: load model and mesh
+	// NOTE: load model
 	model* tex_cube = getModelByPath(&rs->assets, "../data/textured_cube.gltf");
-	assert(tex_cube);
-	const mesh& texmesh = tex_cube->meshes[0];
+	if (!tex_cube) return false;
 
-	// NOTE: load shader
+	// NOTE: load new shader, or get one of the defaults
 	shader_program* s_default = getShaderByName("default", rs->gl_ctx);
-	assert(s_default);
+	if (!s_default) return false;
 
 	// NOTE: init new render group
-	RenderGroup* debug_cube_group = getFreeRenderGroup(rs);
-	assert(debug_cube_group);
-	initRenderGroup(debug_cube_group, rs->rg_arena, s_default, 1,
-			"orange_cubes");
-
-	// NOTE: init entity
-	Entity* e = getFreeEntity(debug_cube_group);
-	assert(e);
-
-	initEntity(e,
-		rs->gl_ctx,
-		rs->rg_arena,
-		tex_cube,
-		s_default->num_vertex_attribs,
-		s_default->attrib_mappings,
-		"textured_box");
-	scaleEntity(e, 5);
-
-#if 0
-	shader_program* s_debug = getShaderByName("debug", rs->gl_ctx);
-	if (!s_debug) return false;
-
-	GLVertexAttrib* db_pos_attrib = getVertexAttribByName(s_debug, "position");
-	GLVertexAttrib* db_normal_attrib = getVertexAttribByName(s_debug, "normal");
-	if (!db_pos_attrib || !db_normal_attrib) return false;
-
-	GLBufferToAttribMapping debug_mappings[2] = {
-		{ "position", db_pos_attrib, texmesh.vertices },
-		{ "normal", db_normal_attrib, texmesh.normals }
-	};
+	RenderGroup* textured_cubes = getFreeRenderGroup(rs);
+	assert(textured_cubes);
+	initRenderGroup(textured_cubes, rs->rg_arena, s_default, 256,
+			"textured_cubes");
 
-	const u32 NUM_CUBES = 4;
+	// NOTE: init entities
+	const u32 NUM_CUBES = 5;
 	glm::vec3 cube_locs[NUM_CUBES] = {
+		glm::vec3(  0,   0,  0),
 		glm::vec3(-10,  10,  0),
 		glm::vec3(-10, -10,  0),
 		glm::vec3( 10,  10,  0),
 		glm::vec3( 10, -10,  0),
 	};
 
-	RenderGroup* orange_cubes = getFreeRenderGroup(rs);
-	assert(orange_cubes != nullptr);
-	initRenderGroup(orange_cubes, rs->rg_arena, s_debug, NUM_CUBES,
-		"debug_cubes");
-
 	for (u32 i = 0; i < NUM_CUBES; i++) {
-		Entity* e = getFreeEntity(orange_cubes);
-		assert(e != nullptr);
-
-		if (!initEntity(e, rs->gl_ctx, rs->rg_arena, tex_cube,
-					2, debug_mappings, "debug_box"))
+		Entity* e = getFreeEntity(textured_cubes);
+		assert(e);
+		char cube_name[256] = {0};
+		snprintf(cube_name, 256, "textured_cube%d", i);
+
+		arenaCopyCStr(rs->rg_arena, cube_name);
+		if (!initEntity(e,
+				rs->gl_ctx,
+				rs->rg_arena,
+				tex_cube,
+				s_default->num_vertex_attribs,
+				s_default->attrib_mappings,
+				cube_name))
 		{
-			// FIXME: this doesn't actually do anything
-			freeRenderGroup(orange_cubes, rs->rg_arena);
 			return false;
 		}
 
 		setEntityPosition(e, cube_locs[i]);
 	}
-#endif
 
 	return true;
 }
@@ -102,7 +77,10 @@ render_cb_pre(RenderState* rs)
 
 		for (u32 j = 0; j < rg.num_entities; j++) {
 			Entity& e = rg.entities[j];
-			rotateEntity(&e, glm::vec3(0, 1, 0), (float) M_PI / (3 * 60));
+			float direction = (j % 2 == 0) ? 1 : -1;
+			rotateEntity(&e,
+				glm::vec3(0, 1, 0),
+				direction * (float) M_PI / (3 * 60));
 		}
 	}
 }