Can the GPU perform your calculations faster than the CPU?.Different methods can be used to achieve the same results, but each method has its own performance and ease-of-use characteristics.Īnswer the following questions to determine the optimal solution: As a result, the performance of these methods varies depending on whether the textures are readable. Some operations act on both the GPU and CPU copy if both are present. The Unity API provides several methods to access or process texture data. Depending on the texture involved and the complexity of the operations, it may be faster and easier to stick to CPU operations (for example, when copying several 2D textures into a Texture2DArray asset). If you want to sample the updated pixel data in a shader, you must first copy it from the CPU to the GPU by calling Apply. CPU pixel data operations act only on the CPU copy of the data, so require readable textures. In some cases, it may be preferable to manipulate your texture data on the CPU, which offers more flexibility in how data is accessed. All these operations can be performed quickly by the GPU. To alter this data, you can copy between textures or render into a texture using a shader.
Sampling textures in shaders is the most common GPU pixel data operation.
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