Function LoadTexture

Chapter_14/src/Textures.cpp:250–285

* Load an image from disk using STB library. */

	* Load an image from disk using STB library.
	*/
	bool LoadTexture(Texture& texture, DirectX::XMFLOAT2& uvAdjustment)
	{
		// Initialize adjustment to identity
		uvAdjustment.x = 1.0f;
		uvAdjustment.y = 1.0f;

		// Load the texture with stb_image (require 4 component RGBA)
		TextureData textureData;
		textureData.texels = stbi_load(texture.filepath.c_str(), &textureData.width, &textureData.height, &textureData.stride, STBI_rgb_alpha);
		textureData.stride = 4;
		textureData.rowPitch = UINT64(textureData.width) * textureData.stride;
		textureData.texelBytes = textureData.rowPitch * UINT64(textureData.height);
		textureData.stbAllocation = true;

		if (!textureData.texels)
		{
			std::string msg = "Error: failed to load texture: \'";
			msg.append(texture.name);
			msg.append("\'");
			MessageBox(NULL, std::wstring(msg.begin(), msg.end()).c_str(), L"Error", MB_OK);
			return false;
		}

		// Prep the texture for compression and use on the GPU (alignment to 4x4) 
		FormatTexture(textureData, uvAdjustment);

		// Store raw texture data as mip level 0
		texture.mips.push_back(textureData);

#if ENABLE_GPU_COMPRESSION
		// Compress texture on GPU and generate mips
		ProcessTexture(texture);
#endif

		return true;
	}

	/**
	* Releases all memory used by texture