private void initCommon() {
setOpaque(true);
setBackgroundColor(null);
metalLayer = (CAMetalLayer) getLayer();
device = MTLDevice.getSystemDefaultDevice();
metalLayer.setDevice(device);
metalLayer.setPixelFormat(MTLPixelFormat.BGRA8Unorm);
// this is the default but if we wanted to perform compute on the final
// rendering layer we could set this to false
metalLayer.setFramebufferOnly(true);
}
public void setupRenderPassDescriptor(MTLTexture texture) {
// create lazily
if (renderPassDescriptor == null) {
renderPassDescriptor = new MTLRenderPassDescriptor();
}
// create a color attachment every frame since we have to recreate the
// texture every frame
MTLRenderPassColorAttachmentDescriptor colorAttachment =
renderPassDescriptor.getColorAttachments().get(0);
colorAttachment.setTexture(texture);
// make sure to clear every frame for best performance
colorAttachment.setLoadAction(MTLLoadAction.Clear);
colorAttachment.setClearColor(new MTLClearColor(0.65, 0.65, 0.65, 1.0));
// if sample count is greater than 1, render into using MSAA, then
// resolve into our color texture
if (sampleCount > 1) {
boolean doUpdate =
msaaTex != null
&& ((msaaTex.getWidth() != texture.getWidth())
|| (msaaTex.getHeight() != texture.getHeight())
|| (msaaTex.getSampleCount() != sampleCount));
if (msaaTex == null || (msaaTex != null && doUpdate)) {
MTLTextureDescriptor desc =
MTLTextureDescriptor.create2DDescriptor(
MTLPixelFormat.BGRA8Unorm, texture.getWidth(), texture.getHeight(), false);
desc.setTextureType(MTLTextureType._2DMultisample);
// sample count was specified to the view by the renderer.
// this must match the sample count given to any pipeline state
// using this render pass descriptor
desc.setSampleCount(sampleCount);
msaaTex = device.newTexture(desc);
}
// When multisampling, perform rendering to _msaaTex, then resolve
// to 'texture' at the end of the scene
colorAttachment.setTexture(msaaTex);
colorAttachment.setResolveTexture(texture);
// set store action to resolve in this case
colorAttachment.setStoreAction(MTLStoreAction.MultisampleResolve);
} else {
// store only attachments that will be presented to the screen, as
// in this case
colorAttachment.setStoreAction(MTLStoreAction.Store);
} // color0
// Now create the depth and stencil attachments
if (depthPixelFormat != MTLPixelFormat.Invalid) {
boolean doUpdate =
depthTex != null
&& ((depthTex.getWidth() != texture.getWidth())
|| (depthTex.getHeight() != texture.getHeight())
|| (depthTex.getSampleCount() != sampleCount));
if (depthTex == null || doUpdate) {
// If we need a depth texture and don't have one, or if the
// depth texture we have is the wrong size
// Then allocate one of the proper size
MTLTextureDescriptor desc =
MTLTextureDescriptor.create2DDescriptor(
depthPixelFormat, texture.getWidth(), texture.getHeight(), false);
desc.setTextureType((sampleCount > 1) ? MTLTextureType._2DMultisample : MTLTextureType._2D);
desc.setSampleCount(sampleCount);
depthTex = device.newTexture(desc);
MTLRenderPassDepthAttachmentDescriptor depthAttachment =
renderPassDescriptor.getDepthAttachment();
depthAttachment.setTexture(depthTex);
depthAttachment.setLoadAction(MTLLoadAction.Clear);
depthAttachment.setStoreAction(MTLStoreAction.DontCare);
depthAttachment.setClearDepth(1.0);
}
} // depth
if (stencilPixelFormat != MTLPixelFormat.Invalid) {
boolean doUpdate =
stencilTex != null
&& ((stencilTex.getWidth() != texture.getWidth())
|| (stencilTex.getHeight() != texture.getHeight())
|| (stencilTex.getSampleCount() != sampleCount));
if (stencilTex == null || doUpdate) {
// If we need a stencil texture and don't have one, or if the
// depth texture we have is the wrong size
// Then allocate one of the proper size
MTLTextureDescriptor desc =
MTLTextureDescriptor.create2DDescriptor(
stencilPixelFormat, texture.getWidth(), texture.getHeight(), false);
desc.setTextureType((sampleCount > 1) ? MTLTextureType._2DMultisample : MTLTextureType._2D);
desc.setSampleCount(sampleCount);
stencilTex = device.newTexture(desc);
MTLRenderPassStencilAttachmentDescriptor stencilAttachment =
renderPassDescriptor.getStencilAttachment();
stencilAttachment.setTexture(stencilTex);
stencilAttachment.setLoadAction(MTLLoadAction.Clear);
stencilAttachment.setStoreAction(MTLStoreAction.DontCare);
stencilAttachment.setClearStencil(0);
}
} // stencil
}