public static bool redraw()
{
IntPtr backBufView = WebGPUNative.wgpuSwapChainGetCurrentTextureView(SwapChain); // create textureView
WGPURenderPassColorAttachmentDescriptor colorDesc = new WGPURenderPassColorAttachmentDescriptor
{
attachment = backBufView,
loadOp = WGPULoadOp.WGPULoadOp_Clear,
storeOp = WGPUStoreOp.WGPUStoreOp_Store,
clearColor = new WGPUColor
{
r = 0.3f,
g = 0.3f,
b = 0.3f,
a = 1.0f
}
};
WGPURenderPassDescriptor renderPass = new WGPURenderPassDescriptor
{
colorAttachmentCount = 1,
colorAttachments = &colorDesc
};
IntPtr encoder = WebGPUNative.wgpuDeviceCreateCommandEncoder(Device, null); // create encoder
IntPtr pass = WebGPUNative.wgpuCommandEncoderBeginRenderPass(encoder, &renderPass);
// update the rotation
rotDeg += 0.1f;
fixed(void *data = &rotDeg)
{
WebGPUNative.wgpuQueueWriteBuffer(Queue, uRotBuf, 0, data, sizeof(float));
}
// draw the triangle (comment these five lines to simply clear the screen)
WebGPUNative.wgpuRenderPassEncoderSetPipeline(pass, pipeline);
WebGPUNative.wgpuRenderPassEncoderSetBindGroup(pass, 0, bindGroup, 0, null);
WebGPUNative.wgpuRenderPassEncoderSetVertexBuffer(pass, 0, vertBuf, 0, 0);
WebGPUNative.wgpuRenderPassEncoderSetIndexBufferWithFormat(pass, indxBuf, WGPUIndexFormat.WGPUIndexFormat_Uint16, 0, 0);
WebGPUNative.wgpuRenderPassEncoderDrawIndexed(pass, 3, 1, 0, 0, 0);
WebGPUNative.wgpuRenderPassEncoderEndPass(pass);
WebGPUNative.wgpuRenderPassEncoderRelease(pass); // release pass
IntPtr commands = WebGPUNative.wgpuCommandEncoderFinish(encoder, null); // create commands
WebGPUNative.wgpuCommandEncoderRelease(encoder); // release encoder
WebGPUNative.wgpuQueueSubmit(Queue, 1, &commands);
WebGPUNative.wgpuCommandBufferRelease(commands); // release commands
// TODO EMSCRIPTEN: wgpuSwapChainPresent is unsupported in Emscripten, so what do we do?
WebGPUNative.wgpuSwapChainPresent(SwapChain);
WebGPUNative.wgpuTextureViewRelease(backBufView); // release textureView
return(true);
}
/**
* Helper to create a buffer.
*
* \param[in] data pointer to the start of the raw data
* \param[in] size number of bytes in \a data
* \param[in] usage type of buffer
*/
private static IntPtr CreateBuffer(void *data, ulong size, WGPUBufferUsage usage)
{
WGPUBufferDescriptor desc = new WGPUBufferDescriptor
{
usage = WGPUBufferUsage.WGPUBufferUsage_CopyDst | usage,
size = size
};
IntPtr buffer = WebGPUNative.wgpuDeviceCreateBuffer(Device, ref desc);
WebGPUNative.wgpuQueueWriteBuffer(Queue, buffer, 0, data, size);
return(buffer);
}