MoltenVK/MoltenVK/Utility/MVKWatermark.mm - external/github.com/KhronosGroup/MoltenVK - Git at Google

 /*
  * MVKWatermark.mm
  *
  * Copyright (c) 2015-2021 The Brenwill Workshop Ltd. (http://www.brenwill.com)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */


 #include "MVKWatermark.h"
 #include "MVKOSExtensions.h"
 #include "MTLTextureDescriptor+MoltenVK.h"
 #include "MVKEnvironment.h"


 /** The structure to hold shader uniforms. */
 typedef struct {
 	float mvpMtx[16];
 	MVKWatermarkColor color;
 } MVKWatermarkUniforms;


 #define kMVKWatermarkUniformBufferIndex				0
 #define kMVKWatermarkVertexUniformBufferLength		(sizeof(MVKWatermarkUniforms))

 #define kMVKWatermarkVertexContentBufferIndex		1
 #define kMVKWatermarkVertexContentBufferLength		(sizeof(float) * 4 * 4)
 #define kMVKWatermarkVertexIndexBufferLength		(sizeof(uint16_t) * 6)

 #define kMVKWatermarkTextureIndex					0


 #pragma mark -
 #pragma mark MVKWatermark

 void MVKWatermark::setPosition(MVKWatermarkPosition position) {
     if ( (position.x == _position.x) && (position.y == _position.y) ) { return; }
     _position = position;
     markUniformsDirty();
 }

 void MVKWatermark::setSize(MVKWatermarkSize size) {
     if ( (size.width == _size.width) && (size.height == _size.height) ) { return; }
     _size = size;
     markUniformsDirty();
 }

 void MVKWatermark::setOpacity(float opacity) {
     if (opacity == _color.a) { return; }
     _color.a = opacity;
     markUniformsDirty();
 }

 void MVKWatermark::markUniformsDirty() { _isUniformsDirty = true; }

 void MVKWatermark::markRenderPipelineStateDirty() {
     [_mtlRenderPipelineState release];
     _mtlRenderPipelineState = nil;
 }

 id<MTLRenderPipelineState> MVKWatermark::mtlRenderPipelineState() {
     if ( !_mtlRenderPipelineState ) { _mtlRenderPipelineState = newRenderPipelineState(); }	// retained
     return _mtlRenderPipelineState;
 }

 id<MTLRenderPipelineState> MVKWatermark::newRenderPipelineState() {
     MTLRenderPipelineDescriptor* plDesc = [MTLRenderPipelineDescriptor new];	// temp retained
     plDesc.label = _mtlName;

     plDesc.vertexFunction = _mtlFunctionVertex;
     plDesc.fragmentFunction = _mtlFunctionFragment;

     plDesc.depthAttachmentPixelFormat = _mtlDepthFormat;
     plDesc.stencilAttachmentPixelFormat = _mtlStencilFormat;
     plDesc.sampleCount = _sampleCount;
     plDesc.rasterizationEnabled = true;

     MTLRenderPipelineColorAttachmentDescriptor* colorDesc = plDesc.colorAttachments[0];
     colorDesc.pixelFormat = _mtlColorFormat;
     colorDesc.writeMask = MTLColorWriteMaskAll;
     colorDesc.blendingEnabled = true;
     colorDesc.rgbBlendOperation = MTLBlendOperationAdd;
     colorDesc.alphaBlendOperation = MTLBlendOperationMax;
     colorDesc.sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
     colorDesc.destinationRGBBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
     colorDesc.sourceAlphaBlendFactor = MTLBlendFactorOne;
     colorDesc.destinationAlphaBlendFactor = MTLBlendFactorZero;

     MTLVertexDescriptor* vtxDesc = plDesc.vertexDescriptor;

     // Vertex attribute descriptors
     MTLVertexAttributeDescriptorArray* vaDescArray = vtxDesc.attributes;
     MTLVertexAttributeDescriptor* vaDesc;
     NSUInteger vtxStride = 0;

     // Vertex location
     vaDesc = vaDescArray[0];
     vaDesc.format = MTLVertexFormatFloat2;
     vaDesc.bufferIndex = kMVKWatermarkVertexContentBufferIndex;
     vaDesc.offset = vtxStride;
     vtxStride += sizeof(float) * 2;

     // Vertex texture coords
     vaDesc = vaDescArray[1];
     vaDesc.format = MTLVertexFormatFloat2;
     vaDesc.bufferIndex = kMVKWatermarkVertexContentBufferIndex;
     vaDesc.offset = vtxStride;
     vtxStride += sizeof(float) * 2;

     // Vertex attribute buffer.
     MTLVertexBufferLayoutDescriptorArray* vbDescArray = vtxDesc.layouts;
     MTLVertexBufferLayoutDescriptor* vbDesc = vbDescArray[kMVKWatermarkVertexContentBufferIndex];
     vbDesc.stepFunction = MTLVertexStepFunctionPerVertex;
     vbDesc.stepRate = 1;
     vbDesc.stride = vtxStride;

     NSError* err = nil;
     id<MTLRenderPipelineState> rps = [_mtlDevice newRenderPipelineStateWithDescriptor: plDesc error: &err];	// retained
     MVKAssert( !err, "Could not create watermark pipeline state (Error code %li)\n%s", (long)err.code, err.localizedDescription.UTF8String);
 	[plDesc release];		// temp released
 	return rps;
 }


 #pragma mark Rendering

 void MVKWatermark::render(id<MTLTexture> mtlTexture, id<MTLCommandBuffer> mtlCommandBuffer, double frameInterval) {

     updateRenderState(mtlTexture);

     MTLRenderPassDescriptor* mtlRPDesc = getMTLRenderPassDescriptor();
     MTLRenderPassColorAttachmentDescriptor* mtlColorAttDesc = mtlRPDesc.colorAttachments[0];
     mtlColorAttDesc.texture = mtlTexture;

     id<MTLRenderCommandEncoder> mtlRendEnc = [mtlCommandBuffer renderCommandEncoderWithDescriptor: mtlRPDesc];
     mtlRendEnc.label = _mtlRendEncName;
     render(mtlRendEnc, frameInterval);
     [mtlRendEnc endEncoding];
 }

 void MVKWatermark::updateRenderState(id<MTLTexture> mtlTexture) {

     MTLPixelFormat mtlColorFormat = mtlTexture.pixelFormat;
     if (_mtlColorFormat != mtlColorFormat) {
         _mtlColorFormat = mtlColorFormat;
         markRenderPipelineStateDirty();
     }

     MTLPixelFormat mtlDepthFormat = MTLPixelFormatInvalid;
     if (_mtlDepthFormat != mtlDepthFormat) {
         _mtlDepthFormat = mtlDepthFormat;
         markRenderPipelineStateDirty();
     }

     MTLPixelFormat mtlStencilFormat = MTLPixelFormatInvalid;
     if (_mtlStencilFormat != mtlStencilFormat) {
         _mtlStencilFormat = mtlStencilFormat;
         markRenderPipelineStateDirty();
     }

     NSUInteger sampleCount = mtlTexture.sampleCount;
     if (_sampleCount != sampleCount) {
         _sampleCount = sampleCount;
         markRenderPipelineStateDirty();
     }
 }

 void MVKWatermark::render(id<MTLRenderCommandEncoder> mtlEncoder, double frameInterval) {

     updateUniforms();

     [mtlEncoder pushDebugGroup: _mtlName];

     [mtlEncoder setRenderPipelineState: mtlRenderPipelineState()];
     [mtlEncoder setCullMode: MTLCullModeBack];
     [mtlEncoder setVertexBuffer: _mtlVertexContentBuffer offset: 0 atIndex: kMVKWatermarkVertexContentBufferIndex];
     [mtlEncoder setVertexBuffer: _mtlVertexUniformBuffer offset: 0 atIndex: kMVKWatermarkUniformBufferIndex];
     [mtlEncoder setFragmentTexture: _mtlTexture atIndex: kMVKWatermarkTextureIndex];
     [mtlEncoder setFragmentSamplerState: _mtlSamplerState atIndex: kMVKWatermarkTextureIndex];

     [mtlEncoder drawIndexedPrimitives: MTLPrimitiveTypeTriangle
                         indexCount: 6
                          indexType: MTLIndexTypeUInt16
                        indexBuffer: _mtlVertexIndexBuffer
                  indexBufferOffset: 0];

     [mtlEncoder popDebugGroup];
 }

 /** Updates the shader uniforms structure from the properties of this instance. */
 void MVKWatermark::updateUniforms() {
     if ( !_isUniformsDirty ) { return; }

     MVKWatermarkUniforms* pUniforms = (MVKWatermarkUniforms*)_mtlVertexUniformBuffer.contents;

     // Populate the MVP matrix uniform
     // The matrix is specified in clip-space coordinates (-1.0 < v < 1.0 for each axis).
     float* mvpMtx = (float*)&(pUniforms->mvpMtx);
     mvpMtx[0] = _size.width;
     mvpMtx[1] = 0.0;
     mvpMtx[2] = 0.0;
     mvpMtx[3] = 0.0;

     mvpMtx[4] = 0.0;
     mvpMtx[5] = _size.height;
     mvpMtx[6] = 0.0;
     mvpMtx[7] = 0.0;

     mvpMtx[8] = 0.0;
     mvpMtx[9] = 0.0;
     mvpMtx[10] = 1.0;
     mvpMtx[11] = 0.0;

     mvpMtx[12] = _position.x;
     mvpMtx[13] = _position.y;
     mvpMtx[14] = 0.0;
     mvpMtx[15] = 1.0;

     // Populate the opacity uniform
     pUniforms->color = _color;

     _isUniformsDirty = false;
 }

 // Returns a MTLRenderPassDescriptor that can be used to render this watermark.
 MTLRenderPassDescriptor* MVKWatermark::getMTLRenderPassDescriptor() {
     if ( !_mtlRenderPassDescriptor ) {
         _mtlRenderPassDescriptor = [[MTLRenderPassDescriptor renderPassDescriptor] retain];		// retained
         MTLRenderPassColorAttachmentDescriptor* mtlColorAttDesc = _mtlRenderPassDescriptor.colorAttachments[0];
         mtlColorAttDesc.loadAction = MTLLoadActionLoad;
         mtlColorAttDesc.storeAction = MTLStoreActionStore;
     }
     return _mtlRenderPassDescriptor;
 }


 #pragma mark Instance creation

 MVKWatermark::MVKWatermark(id<MTLDevice> mtlDevice,
                            unsigned char* textureContent,
                            uint32_t textureWidth,
                            uint32_t textureHeight,
                            MTLPixelFormat textureFormat,
                            NSUInteger textureBytesPerRow,
                            const char* mslSourceCode) : _position(0, 0), _size(1, 1), _color(1, 1, 1, 0.25) {
     _mtlColorFormat = MTLPixelFormatInvalid;
     _mtlDepthFormat = MTLPixelFormatInvalid;
     _mtlStencilFormat = MTLPixelFormatInvalid;
     _sampleCount = 1;
     _mtlName = [@"License Watermark" retain];                           // retained
     _mtlRendEncName = [@"License Watermark RenderEncoder" retain];      // retained
     _isUniformsDirty = true;

     _mtlDevice = [mtlDevice retain];    // retained
     initTexture(textureContent, textureWidth, textureHeight, textureFormat, textureBytesPerRow);
     initShaders(mslSourceCode);
     initBuffers();
     _mtlRenderPipelineState = nil;
     _mtlRenderPassDescriptor = nil;
 }

 // Initialize the texture to use for rendering the watermark
 void MVKWatermark::initTexture(unsigned char* textureContent,
                                uint32_t textureWidth,
                                uint32_t textureHeight,
                                MTLPixelFormat textureFormat,
                                NSUInteger textureBytesPerRow) {

     MTLTextureDescriptor* texDesc = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat: textureFormat
                                                                                        width: textureWidth
                                                                                       height: textureHeight
                                                                                    mipmapped: NO];
     texDesc.usageMVK = MTLTextureUsageShaderRead;
 #if MVK_IOS
     texDesc.storageModeMVK = MTLStorageModeShared;
 #endif
 #if MVK_MACOS
     texDesc.storageModeMVK = MTLStorageModeManaged;
 #endif

     _mtlTexture = [_mtlDevice newTextureWithDescriptor: texDesc];		// retained
     [_mtlTexture replaceRegion: MTLRegionMake2D(0, 0, textureWidth, textureHeight)
                    mipmapLevel: 0
                          slice: 0
                      withBytes: textureContent
                    bytesPerRow: textureBytesPerRow
                  bytesPerImage: 0];

     MTLSamplerDescriptor* sampDesc = [MTLSamplerDescriptor new];				// temp retained
     sampDesc.minFilter = MTLSamplerMinMagFilterLinear;
     _mtlSamplerState = [_mtlDevice newSamplerStateWithDescriptor: sampDesc];	// retained
 	[sampDesc release];															// temp released
 }

 // Initialize the shader functions for rendering the watermark
 void MVKWatermark::initShaders(const char* mslSourceCode) {
     NSError* err = nil;
 	NSString* nsSrc = [[NSString alloc] initWithUTF8String: mslSourceCode];	// temp retained
 	id<MTLLibrary> mtlLib = [_mtlDevice newLibraryWithSource: nsSrc
 													 options: nil
 													   error: &err];		// temp retained
 	MVKAssert( !err, "Could not compile watermark shaders (Error code %li):\n%s", (long)err.code, err.localizedDescription.UTF8String);

     _mtlFunctionVertex = [mtlLib newFunctionWithName: @"watermarkVertex"];          // retained
     _mtlFunctionFragment = [mtlLib newFunctionWithName: @"watermarkFragment"];      // retained

 	[nsSrc release];	// temp released
 	[mtlLib release];	// temp released
 }

 // Initialize the vertex buffers to use for rendering the watermark
 void MVKWatermark::initBuffers() {
     _mtlVertexUniformBuffer = [_mtlDevice newBufferWithLength: kMVKWatermarkVertexUniformBufferLength
                                                      options: MTLResourceOptionCPUCacheModeDefault];	// retained

     _mtlVertexContentBuffer = [_mtlDevice newBufferWithLength: kMVKWatermarkVertexContentBufferLength
                                                      options: MTLResourceOptionCPUCacheModeDefault];	// retained

     float* vtxContents = (float*)_mtlVertexContentBuffer.contents;
     uint32_t idx = 0;

     // Bottom left
     vtxContents[idx++] = -1.0;		// Location X
     vtxContents[idx++] = -1.0;		// Location Y
     vtxContents[idx++] =  0.0;		// TexCoord X
     vtxContents[idx++] =  1.0;		// TexCoord Y

     // Bottom right
     vtxContents[idx++] =  1.0;		// Location X
     vtxContents[idx++] = -1.0;		// Location Y
     vtxContents[idx++] =  1.0;		// TexCoord X
     vtxContents[idx++] =  1.0;		// TexCoord Y

     // Top left
     vtxContents[idx++] = -1.0;		// Location X
     vtxContents[idx++] =  1.0;		// Location Y
     vtxContents[idx++] =  0.0;		// TexCoord X
     vtxContents[idx++] =  0.0;		// TexCoord Y

     // Top right
     vtxContents[idx++] =  1.0;		// Location X
     vtxContents[idx++] =  1.0;		// Location Y
     vtxContents[idx++] =  1.0;		// TexCoord X
     vtxContents[idx++] =  0.0;		// TexCoord Y

     _mtlVertexIndexBuffer = [_mtlDevice newBufferWithLength: kMVKWatermarkVertexIndexBufferLength
                                                    options: MTLResourceOptionCPUCacheModeDefault];	// retained
     uint16_t* vtxIndices = (uint16_t*)_mtlVertexIndexBuffer.contents;
     idx = 0;
     vtxIndices[idx++] = 0;		// First face
     vtxIndices[idx++] = 2;
     vtxIndices[idx++] = 3;

     vtxIndices[idx++] = 3;		// Second face
     vtxIndices[idx++] = 1;
     vtxIndices[idx++] = 0;
 }

 MVKWatermark::~MVKWatermark() {
     [_mtlName release];
     [_mtlRendEncName release];
     [_mtlDevice release];
     [_mtlTexture release];
     [_mtlSamplerState release];
     [_mtlFunctionVertex release];
     [_mtlFunctionFragment release];
     [_mtlRenderPipelineState release];
     [_mtlVertexContentBuffer release];
     [_mtlVertexIndexBuffer release];
     [_mtlVertexUniformBuffer release];
     [_mtlRenderPassDescriptor release];
 }


 #pragma mark -
 #pragma mark MVKWatermarkRandom

 static inline uint32_t randomUInt() { return arc4random(); }
 static inline uint32_t randomUIntBelow(uint32_t max) { return randomUInt() % max; }
 static inline float randomFloat() { return (float)randomUInt() / (float)(1LL << 32); }
 static inline double randomFloatBetween(float min, float max) { return min + (randomFloat() * (max - min)); }


 void MVKWatermarkRandom::updateRenderState(id<MTLTexture> mtlTexture) {

     MVKWatermark::updateRenderState(mtlTexture);

     // Calculate the size of the watermark as a portion of the size of the framebuffer.
     // The watermark is displayed in clip-space coordinates, with the coordinate origin
     // at the center of the framebuffer, and positive coordinates to the right and up
     // and negative coordinates to the left and down.
     float sideLen = _scale;
     double renderAspect = (double)mtlTexture.width / (double)mtlTexture.height;
     sideLen = MIN(sideLen, sideLen * renderAspect);
     setSize(MVKWatermarkSize(sideLen / renderAspect, sideLen));
 }

 void MVKWatermarkRandom::render(id<MTLRenderCommandEncoder> mtlEncoder, double frameInterval) {

     // Determine the opacity
     float opacity = _color.a + (_opacityVelocity * frameInterval);
     BOOL isFadedOut = (opacity < _minOpacity);
     if (opacity < _minOpacity) {
         opacity = _minOpacity;
         _opacityVelocity = ABS(_opacityVelocity);
     }
     if (opacity > _maxOpacity) {
         opacity = _maxOpacity;
         _opacityVelocity = -ABS(_opacityVelocity);
     }
     setOpacity(opacity);

     // Determine the position in clip-space coordinates.
     MVKWatermarkPosition newPos = _position;
     switch (_positionMode) {
         case kMVKWatermarkPositionModeTeleport: {
             if (isFadedOut) {
                 // Move to a new position somewhere on the screen before fading back in
                 newPos.x = randomFloatBetween(-_maxPosition, _maxPosition);
                 newPos.y = randomFloatBetween(-_maxPosition, _maxPosition);
             }
             break;
         }
         case kMVKWatermarkPositionModeBounce: {
             // Bounce around the screen, always staying with the screen bounds
             newPos.x = _position.x + (_positionVelocity.x * frameInterval);
             newPos.y = _position.y + (_positionVelocity.y * frameInterval);

             if (newPos.x < -_maxPosition) {
                 newPos.x = -_maxPosition;
                 _positionVelocity.x = ABS(_positionVelocity.x);
             }
             if (newPos.x > _maxPosition) {
                 newPos.x = _maxPosition;
                 _positionVelocity.x = -ABS(_positionVelocity.x);
             }
             if (newPos.y < -_maxPosition) {
                 newPos.y = -_maxPosition;
                 _positionVelocity.y = ABS(_positionVelocity.y);
             }
             if (newPos.y > _maxPosition) {
                 newPos.y = _maxPosition;
                 _positionVelocity.y = -ABS(_positionVelocity.y);
             }
             break;
         }
     }
     setPosition(newPos);

     MVKWatermark::render(mtlEncoder, frameInterval);
 }

 MVKWatermarkRandom::MVKWatermarkRandom(id<MTLDevice> mtlDevice,
                                        unsigned char* textureContent,
                                        uint32_t textureWidth,
                                        uint32_t textureHeight,
                                        MTLPixelFormat textureFormat,
                                        NSUInteger textureBytesPerRow,
                                        const char* mslSourceCode) : MVKWatermark(mtlDevice,
                                                                                  textureContent,
                                                                                  textureWidth,
                                                                                  textureHeight,
                                                                                  textureFormat,
                                                                                  textureBytesPerRow,
                                                                                  mslSourceCode), _positionVelocity(0, 0) {
     // Randomly select a position movement mode, but favour bounce mode
     _positionMode = ( (randomUIntBelow(3) == kMVKWatermarkPositionModeTeleport)
                      ? kMVKWatermarkPositionModeTeleport
                      : kMVKWatermarkPositionModeBounce);
     switch (_positionMode) {
         case kMVKWatermarkPositionModeBounce:
             _minOpacity = 0.25;
             _maxOpacity = 0.75;
             break;
         case kMVKWatermarkPositionModeTeleport:
             _minOpacity = 0.0;
             _maxOpacity = 0.75;
             break;
     }
     _opacityVelocity = (_maxOpacity - _minOpacity) / 2.5;
     setOpacity(_minOpacity);

     _scale = 0.2;
     _maxPosition = 1.0 - _scale;
     _positionVelocity = MVKWatermarkPosition(_maxPosition / 3.0, _maxPosition / 4.0);
     setPosition(MVKWatermarkPosition(randomFloatBetween(-_maxPosition, _maxPosition),
                                      randomFloatBetween(-_maxPosition, _maxPosition)));
 }
	/*
	* MVKWatermark.mm
	*
	* Copyright (c) 2015-2021 The Brenwill Workshop Ltd. (http://www.brenwill.com)
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/


	#include "MVKWatermark.h"
	#include "MVKOSExtensions.h"
	#include "MTLTextureDescriptor+MoltenVK.h"
	#include "MVKEnvironment.h"


	/** The structure to hold shader uniforms. */
	typedef struct {
	float mvpMtx[16];
	MVKWatermarkColor color;
	} MVKWatermarkUniforms;


	#define kMVKWatermarkUniformBufferIndex 0
	#define kMVKWatermarkVertexUniformBufferLength (sizeof(MVKWatermarkUniforms))

	#define kMVKWatermarkVertexContentBufferIndex 1
	#define kMVKWatermarkVertexContentBufferLength (sizeof(float) * 4 * 4)
	#define kMVKWatermarkVertexIndexBufferLength (sizeof(uint16_t) * 6)

	#define kMVKWatermarkTextureIndex 0


	#pragma mark -
	#pragma mark MVKWatermark

	void MVKWatermark::setPosition(MVKWatermarkPosition position) {
	if ( (position.x == _position.x) && (position.y == _position.y) ) { return; }
	_position = position;
	markUniformsDirty();
	}

	void MVKWatermark::setSize(MVKWatermarkSize size) {
	if ( (size.width == _size.width) && (size.height == _size.height) ) { return; }
	_size = size;
	markUniformsDirty();
	}

	void MVKWatermark::setOpacity(float opacity) {
	if (opacity == _color.a) { return; }
	_color.a = opacity;
	markUniformsDirty();
	}

	void MVKWatermark::markUniformsDirty() { _isUniformsDirty = true; }

	void MVKWatermark::markRenderPipelineStateDirty() {
	[_mtlRenderPipelineState release];
	_mtlRenderPipelineState = nil;
	}

	id<MTLRenderPipelineState> MVKWatermark::mtlRenderPipelineState() {
	if ( !_mtlRenderPipelineState ) { _mtlRenderPipelineState = newRenderPipelineState(); } // retained
	return _mtlRenderPipelineState;
	}

	id<MTLRenderPipelineState> MVKWatermark::newRenderPipelineState() {
	MTLRenderPipelineDescriptor* plDesc = [MTLRenderPipelineDescriptor new]; // temp retained
	plDesc.label = _mtlName;

	plDesc.vertexFunction = _mtlFunctionVertex;
	plDesc.fragmentFunction = _mtlFunctionFragment;

	plDesc.depthAttachmentPixelFormat = _mtlDepthFormat;
	plDesc.stencilAttachmentPixelFormat = _mtlStencilFormat;
	plDesc.sampleCount = _sampleCount;
	plDesc.rasterizationEnabled = true;

	MTLRenderPipelineColorAttachmentDescriptor* colorDesc = plDesc.colorAttachments[0];
	colorDesc.pixelFormat = _mtlColorFormat;
	colorDesc.writeMask = MTLColorWriteMaskAll;
	colorDesc.blendingEnabled = true;
	colorDesc.rgbBlendOperation = MTLBlendOperationAdd;
	colorDesc.alphaBlendOperation = MTLBlendOperationMax;
	colorDesc.sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
	colorDesc.destinationRGBBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
	colorDesc.sourceAlphaBlendFactor = MTLBlendFactorOne;
	colorDesc.destinationAlphaBlendFactor = MTLBlendFactorZero;

	MTLVertexDescriptor* vtxDesc = plDesc.vertexDescriptor;

	// Vertex attribute descriptors
	MTLVertexAttributeDescriptorArray* vaDescArray = vtxDesc.attributes;
	MTLVertexAttributeDescriptor* vaDesc;
	NSUInteger vtxStride = 0;

	// Vertex location
	vaDesc = vaDescArray[0];
	vaDesc.format = MTLVertexFormatFloat2;
	vaDesc.bufferIndex = kMVKWatermarkVertexContentBufferIndex;
	vaDesc.offset = vtxStride;
	vtxStride += sizeof(float) * 2;

	// Vertex texture coords
	vaDesc = vaDescArray[1];
	vaDesc.format = MTLVertexFormatFloat2;
	vaDesc.bufferIndex = kMVKWatermarkVertexContentBufferIndex;
	vaDesc.offset = vtxStride;
	vtxStride += sizeof(float) * 2;

	// Vertex attribute buffer.
	MTLVertexBufferLayoutDescriptorArray* vbDescArray = vtxDesc.layouts;
	MTLVertexBufferLayoutDescriptor* vbDesc = vbDescArray[kMVKWatermarkVertexContentBufferIndex];
	vbDesc.stepFunction = MTLVertexStepFunctionPerVertex;
	vbDesc.stepRate = 1;
	vbDesc.stride = vtxStride;

	NSError* err = nil;
	id<MTLRenderPipelineState> rps = [_mtlDevice newRenderPipelineStateWithDescriptor: plDesc error: &err]; // retained
	MVKAssert( !err, "Could not create watermark pipeline state (Error code %li)\n%s", (long)err.code, err.localizedDescription.UTF8String);
	[plDesc release]; // temp released
	return rps;
	}


	#pragma mark Rendering

	void MVKWatermark::render(id<MTLTexture> mtlTexture, id<MTLCommandBuffer> mtlCommandBuffer, double frameInterval) {

	updateRenderState(mtlTexture);

	MTLRenderPassDescriptor* mtlRPDesc = getMTLRenderPassDescriptor();
	MTLRenderPassColorAttachmentDescriptor* mtlColorAttDesc = mtlRPDesc.colorAttachments[0];
	mtlColorAttDesc.texture = mtlTexture;

	id<MTLRenderCommandEncoder> mtlRendEnc = [mtlCommandBuffer renderCommandEncoderWithDescriptor: mtlRPDesc];
	mtlRendEnc.label = _mtlRendEncName;
	render(mtlRendEnc, frameInterval);
	[mtlRendEnc endEncoding];
	}

	void MVKWatermark::updateRenderState(id<MTLTexture> mtlTexture) {

	MTLPixelFormat mtlColorFormat = mtlTexture.pixelFormat;
	if (_mtlColorFormat != mtlColorFormat) {
	_mtlColorFormat = mtlColorFormat;
	markRenderPipelineStateDirty();
	}

	MTLPixelFormat mtlDepthFormat = MTLPixelFormatInvalid;
	if (_mtlDepthFormat != mtlDepthFormat) {
	_mtlDepthFormat = mtlDepthFormat;
	markRenderPipelineStateDirty();
	}

	MTLPixelFormat mtlStencilFormat = MTLPixelFormatInvalid;
	if (_mtlStencilFormat != mtlStencilFormat) {
	_mtlStencilFormat = mtlStencilFormat;
	markRenderPipelineStateDirty();
	}

	NSUInteger sampleCount = mtlTexture.sampleCount;
	if (_sampleCount != sampleCount) {
	_sampleCount = sampleCount;
	markRenderPipelineStateDirty();
	}
	}

	void MVKWatermark::render(id<MTLRenderCommandEncoder> mtlEncoder, double frameInterval) {

	updateUniforms();

	[mtlEncoder pushDebugGroup: _mtlName];

	[mtlEncoder setRenderPipelineState: mtlRenderPipelineState()];
	[mtlEncoder setCullMode: MTLCullModeBack];
	[mtlEncoder setVertexBuffer: _mtlVertexContentBuffer offset: 0 atIndex: kMVKWatermarkVertexContentBufferIndex];
	[mtlEncoder setVertexBuffer: _mtlVertexUniformBuffer offset: 0 atIndex: kMVKWatermarkUniformBufferIndex];
	[mtlEncoder setFragmentTexture: _mtlTexture atIndex: kMVKWatermarkTextureIndex];
	[mtlEncoder setFragmentSamplerState: _mtlSamplerState atIndex: kMVKWatermarkTextureIndex];

	[mtlEncoder drawIndexedPrimitives: MTLPrimitiveTypeTriangle
	indexCount: 6
	indexType: MTLIndexTypeUInt16
	indexBuffer: _mtlVertexIndexBuffer
	indexBufferOffset: 0];

	[mtlEncoder popDebugGroup];
	}

	/** Updates the shader uniforms structure from the properties of this instance. */
	void MVKWatermark::updateUniforms() {
	if ( !_isUniformsDirty ) { return; }

	MVKWatermarkUniforms* pUniforms = (MVKWatermarkUniforms*)_mtlVertexUniformBuffer.contents;

	// Populate the MVP matrix uniform
	// The matrix is specified in clip-space coordinates (-1.0 < v < 1.0 for each axis).
	float* mvpMtx = (float*)&(pUniforms->mvpMtx);
	mvpMtx[0] = _size.width;
	mvpMtx[1] = 0.0;
	mvpMtx[2] = 0.0;
	mvpMtx[3] = 0.0;

	mvpMtx[4] = 0.0;
	mvpMtx[5] = _size.height;
	mvpMtx[6] = 0.0;
	mvpMtx[7] = 0.0;

	mvpMtx[8] = 0.0;
	mvpMtx[9] = 0.0;
	mvpMtx[10] = 1.0;
	mvpMtx[11] = 0.0;

	mvpMtx[12] = _position.x;
	mvpMtx[13] = _position.y;
	mvpMtx[14] = 0.0;
	mvpMtx[15] = 1.0;

	// Populate the opacity uniform
	pUniforms->color = _color;

	_isUniformsDirty = false;
	}

	// Returns a MTLRenderPassDescriptor that can be used to render this watermark.
	MTLRenderPassDescriptor* MVKWatermark::getMTLRenderPassDescriptor() {
	if ( !_mtlRenderPassDescriptor ) {
	_mtlRenderPassDescriptor = [[MTLRenderPassDescriptor renderPassDescriptor] retain]; // retained
	MTLRenderPassColorAttachmentDescriptor* mtlColorAttDesc = _mtlRenderPassDescriptor.colorAttachments[0];
	mtlColorAttDesc.loadAction = MTLLoadActionLoad;
	mtlColorAttDesc.storeAction = MTLStoreActionStore;
	}
	return _mtlRenderPassDescriptor;
	}


	#pragma mark Instance creation

	MVKWatermark::MVKWatermark(id<MTLDevice> mtlDevice,
	unsigned char* textureContent,
	uint32_t textureWidth,
	uint32_t textureHeight,
	MTLPixelFormat textureFormat,
	NSUInteger textureBytesPerRow,
	const char* mslSourceCode) : _position(0, 0), _size(1, 1), _color(1, 1, 1, 0.25) {
	_mtlColorFormat = MTLPixelFormatInvalid;
	_mtlDepthFormat = MTLPixelFormatInvalid;
	_mtlStencilFormat = MTLPixelFormatInvalid;
	_sampleCount = 1;
	_mtlName = [@"License Watermark" retain]; // retained
	_mtlRendEncName = [@"License Watermark RenderEncoder" retain]; // retained
	_isUniformsDirty = true;

	_mtlDevice = [mtlDevice retain]; // retained
	initTexture(textureContent, textureWidth, textureHeight, textureFormat, textureBytesPerRow);
	initShaders(mslSourceCode);
	initBuffers();
	_mtlRenderPipelineState = nil;
	_mtlRenderPassDescriptor = nil;
	}

	// Initialize the texture to use for rendering the watermark
	void MVKWatermark::initTexture(unsigned char* textureContent,
	uint32_t textureWidth,
	uint32_t textureHeight,
	MTLPixelFormat textureFormat,
	NSUInteger textureBytesPerRow) {

	MTLTextureDescriptor* texDesc = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat: textureFormat
	width: textureWidth
	height: textureHeight
	mipmapped: NO];
	texDesc.usageMVK = MTLTextureUsageShaderRead;
	#if MVK_IOS
	texDesc.storageModeMVK = MTLStorageModeShared;
	#endif
	#if MVK_MACOS
	texDesc.storageModeMVK = MTLStorageModeManaged;
	#endif

	_mtlTexture = [_mtlDevice newTextureWithDescriptor: texDesc]; // retained
	[_mtlTexture replaceRegion: MTLRegionMake2D(0, 0, textureWidth, textureHeight)
	mipmapLevel: 0
	slice: 0
	withBytes: textureContent
	bytesPerRow: textureBytesPerRow
	bytesPerImage: 0];

	MTLSamplerDescriptor* sampDesc = [MTLSamplerDescriptor new]; // temp retained
	sampDesc.minFilter = MTLSamplerMinMagFilterLinear;
	_mtlSamplerState = [_mtlDevice newSamplerStateWithDescriptor: sampDesc]; // retained
	[sampDesc release]; // temp released
	}

	// Initialize the shader functions for rendering the watermark
	void MVKWatermark::initShaders(const char* mslSourceCode) {
	NSError* err = nil;
	NSString* nsSrc = [[NSString alloc] initWithUTF8String: mslSourceCode]; // temp retained
	id<MTLLibrary> mtlLib = [_mtlDevice newLibraryWithSource: nsSrc
	options: nil
	error: &err]; // temp retained
	MVKAssert( !err, "Could not compile watermark shaders (Error code %li):\n%s", (long)err.code, err.localizedDescription.UTF8String);

	_mtlFunctionVertex = [mtlLib newFunctionWithName: @"watermarkVertex"]; // retained
	_mtlFunctionFragment = [mtlLib newFunctionWithName: @"watermarkFragment"]; // retained

	[nsSrc release]; // temp released
	[mtlLib release]; // temp released
	}

	// Initialize the vertex buffers to use for rendering the watermark
	void MVKWatermark::initBuffers() {
	_mtlVertexUniformBuffer = [_mtlDevice newBufferWithLength: kMVKWatermarkVertexUniformBufferLength
	options: MTLResourceOptionCPUCacheModeDefault]; // retained

	_mtlVertexContentBuffer = [_mtlDevice newBufferWithLength: kMVKWatermarkVertexContentBufferLength
	options: MTLResourceOptionCPUCacheModeDefault]; // retained

	float* vtxContents = (float*)_mtlVertexContentBuffer.contents;
	uint32_t idx = 0;

	// Bottom left
	vtxContents[idx++] = -1.0; // Location X
	vtxContents[idx++] = -1.0; // Location Y
	vtxContents[idx++] = 0.0; // TexCoord X
	vtxContents[idx++] = 1.0; // TexCoord Y

	// Bottom right
	vtxContents[idx++] = 1.0; // Location X
	vtxContents[idx++] = -1.0; // Location Y
	vtxContents[idx++] = 1.0; // TexCoord X
	vtxContents[idx++] = 1.0; // TexCoord Y

	// Top left
	vtxContents[idx++] = -1.0; // Location X
	vtxContents[idx++] = 1.0; // Location Y
	vtxContents[idx++] = 0.0; // TexCoord X
	vtxContents[idx++] = 0.0; // TexCoord Y

	// Top right
	vtxContents[idx++] = 1.0; // Location X
	vtxContents[idx++] = 1.0; // Location Y
	vtxContents[idx++] = 1.0; // TexCoord X
	vtxContents[idx++] = 0.0; // TexCoord Y

	_mtlVertexIndexBuffer = [_mtlDevice newBufferWithLength: kMVKWatermarkVertexIndexBufferLength
	options: MTLResourceOptionCPUCacheModeDefault]; // retained
	uint16_t* vtxIndices = (uint16_t*)_mtlVertexIndexBuffer.contents;
	idx = 0;
	vtxIndices[idx++] = 0; // First face
	vtxIndices[idx++] = 2;
	vtxIndices[idx++] = 3;

	vtxIndices[idx++] = 3; // Second face
	vtxIndices[idx++] = 1;
	vtxIndices[idx++] = 0;
	}

	MVKWatermark::~MVKWatermark() {
	[_mtlName release];
	[_mtlRendEncName release];
	[_mtlDevice release];
	[_mtlTexture release];
	[_mtlSamplerState release];
	[_mtlFunctionVertex release];
	[_mtlFunctionFragment release];
	[_mtlRenderPipelineState release];
	[_mtlVertexContentBuffer release];
	[_mtlVertexIndexBuffer release];
	[_mtlVertexUniformBuffer release];
	[_mtlRenderPassDescriptor release];
	}


	#pragma mark -
	#pragma mark MVKWatermarkRandom

	static inline uint32_t randomUInt() { return arc4random(); }
	static inline uint32_t randomUIntBelow(uint32_t max) { return randomUInt() % max; }
	static inline float randomFloat() { return (float)randomUInt() / (float)(1LL << 32); }
	static inline double randomFloatBetween(float min, float max) { return min + (randomFloat() * (max - min)); }


	void MVKWatermarkRandom::updateRenderState(id<MTLTexture> mtlTexture) {

	MVKWatermark::updateRenderState(mtlTexture);

	// Calculate the size of the watermark as a portion of the size of the framebuffer.
	// The watermark is displayed in clip-space coordinates, with the coordinate origin
	// at the center of the framebuffer, and positive coordinates to the right and up
	// and negative coordinates to the left and down.
	float sideLen = _scale;
	double renderAspect = (double)mtlTexture.width / (double)mtlTexture.height;
	sideLen = MIN(sideLen, sideLen * renderAspect);
	setSize(MVKWatermarkSize(sideLen / renderAspect, sideLen));
	}

	void MVKWatermarkRandom::render(id<MTLRenderCommandEncoder> mtlEncoder, double frameInterval) {

	// Determine the opacity
	float opacity = _color.a + (_opacityVelocity * frameInterval);
	BOOL isFadedOut = (opacity < _minOpacity);
	if (opacity < _minOpacity) {
	opacity = _minOpacity;
	_opacityVelocity = ABS(_opacityVelocity);
	}
	if (opacity > _maxOpacity) {
	opacity = _maxOpacity;
	_opacityVelocity = -ABS(_opacityVelocity);
	}
	setOpacity(opacity);

	// Determine the position in clip-space coordinates.
	MVKWatermarkPosition newPos = _position;
	switch (_positionMode) {
	case kMVKWatermarkPositionModeTeleport: {
	if (isFadedOut) {
	// Move to a new position somewhere on the screen before fading back in
	newPos.x = randomFloatBetween(-_maxPosition, _maxPosition);
	newPos.y = randomFloatBetween(-_maxPosition, _maxPosition);
	}
	break;
	}
	case kMVKWatermarkPositionModeBounce: {
	// Bounce around the screen, always staying with the screen bounds
	newPos.x = _position.x + (_positionVelocity.x * frameInterval);
	newPos.y = _position.y + (_positionVelocity.y * frameInterval);

	if (newPos.x < -_maxPosition) {
	newPos.x = -_maxPosition;
	_positionVelocity.x = ABS(_positionVelocity.x);
	}
	if (newPos.x > _maxPosition) {
	newPos.x = _maxPosition;
	_positionVelocity.x = -ABS(_positionVelocity.x);
	}
	if (newPos.y < -_maxPosition) {
	newPos.y = -_maxPosition;
	_positionVelocity.y = ABS(_positionVelocity.y);
	}
	if (newPos.y > _maxPosition) {
	newPos.y = _maxPosition;
	_positionVelocity.y = -ABS(_positionVelocity.y);
	}
	break;
	}
	}
	setPosition(newPos);

	MVKWatermark::render(mtlEncoder, frameInterval);
	}

	MVKWatermarkRandom::MVKWatermarkRandom(id<MTLDevice> mtlDevice,
	unsigned char* textureContent,
	uint32_t textureWidth,
	uint32_t textureHeight,
	MTLPixelFormat textureFormat,
	NSUInteger textureBytesPerRow,
	const char* mslSourceCode) : MVKWatermark(mtlDevice,
	textureContent,
	textureWidth,
	textureHeight,
	textureFormat,
	textureBytesPerRow,
	mslSourceCode), _positionVelocity(0, 0) {
	// Randomly select a position movement mode, but favour bounce mode
	_positionMode = ( (randomUIntBelow(3) == kMVKWatermarkPositionModeTeleport)
	? kMVKWatermarkPositionModeTeleport
	: kMVKWatermarkPositionModeBounce);
	switch (_positionMode) {
	case kMVKWatermarkPositionModeBounce:
	_minOpacity = 0.25;
	_maxOpacity = 0.75;
	break;
	case kMVKWatermarkPositionModeTeleport:
	_minOpacity = 0.0;
	_maxOpacity = 0.75;
	break;
	}
	_opacityVelocity = (_maxOpacity - _minOpacity) / 2.5;
	setOpacity(_minOpacity);

	_scale = 0.2;
	_maxPosition = 1.0 - _scale;
	_positionVelocity = MVKWatermarkPosition(_maxPosition / 3.0, _maxPosition / 4.0);
	setPosition(MVKWatermarkPosition(randomFloatBetween(-_maxPosition, _maxPosition),
	randomFloatBetween(-_maxPosition, _maxPosition)));
	}