forge-uniforms-and-motion

To push per-frame data to GPU shaders using SDL3 GPU, define a CPU-side Uniforms struct aligned to std140 layout and call SDL_PushGPUVertexUniformData or SDL_PushGPUFragmentUniformData before beginning your render pass. This updates dynamic parameters like time and matrices.

Use push uniforms instead of uniform buffers in SDL3 for small, frequently changing per-frame data. Push uniforms are ideal for dynamic parameters like time-based shader effects and animations, whereas uniform buffers suit larger datasets.

Yes, SDL3 GPU push uniform data requires std140 alignment. You must define your CPU-side Uniforms struct to match the shader's cbuffer layout exactly, ensuring proper memory alignment before pushing the data to the vertex or fragment stages.

Yes, you can update shader time and matrices dynamically before SDL_BeginGPURenderPass. By calling SDL_PushGPUVertexUniformData or SDL_PushGPUFragmentUniformData on the command buffer, you pass per-frame data like time and colors directly to the GPU shaders.

The best way to pass dynamic parameters to vertex and fragment stages in SDL3 is using push uniforms. Define a matching Uniforms struct, apply std140 alignment, and push the data via SDL_PushGPUVertexUniformData and SDL_PushGPUFragmentUniformData before rendering.