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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrMtlCopyManager.h"
#include "GrSurface.h"
#include "GrMtlCopyPipelineState.h"
#include "GrMtlGpu.h"
#include "GrMtlResourceProvider.h"
#include "GrMtlUtil.h"
#include "SkPoint.h"
#include "SkRect.h"
#include "SkTraceEvent.h"
#import <simd/simd.h>
void GrMtlCopyManager::createCopyProgramBuffer() {
// Create per vertex attribute data for copy as draw
static const simd::float2 vdata[4] = {
{0, 0},
{0, 1},
{1, 0},
{1, 1},
};
fVertexAttributeBuffer = [fGpu->device() newBufferWithLength: sizeof(vdata)
options: MTLResourceStorageModePrivate];
id<MTLBuffer> transferBuffer =
[fGpu->device() newBufferWithBytes: vdata
length: sizeof(vdata)
options: MTLResourceStorageModeManaged];
id<MTLBlitCommandEncoder> blitCmdEncoder = [fGpu->commandBuffer() blitCommandEncoder];
[blitCmdEncoder copyFromBuffer: transferBuffer
sourceOffset: 0
toBuffer: fVertexAttributeBuffer
destinationOffset: 0
size: sizeof(vdata)];
[blitCmdEncoder endEncoding];
}
void GrMtlCopyManager::createCopyProgramShaders() {
// Create shaders required by pipeline state
const GrShaderCaps* shaderCaps = fGpu->caps()->shaderCaps();
const char* version = shaderCaps->versionDeclString();
SkString vertShaderText(version);
vertShaderText.appendf(
"#extension GL_ARB_separate_shader_objects : enable\n"
"#extension GL_ARB_shading_language_420pack : enable\n"
"layout(set = %d"/*kUniform_BufferIndex*/", binding = 0) uniform vertexUniformBuffer {"
"float4 uPosXform;"
"float4 uTexCoordXform;"
"};"
"layout(location = 0) in float2 inPosition;"
"layout(location = 1) out float2 vTexCoord;"
"// Copy Program VS\n"
"void main() {"
"vTexCoord = inPosition * uTexCoordXform.xy + uTexCoordXform.zw;"
"sk_Position.xy = inPosition * uPosXform.xy + uPosXform.zw;"
"sk_Position.zw = float2(0, 1);"
"}",
kUniform_BufferIndex
);
SkString fragShaderText(version);
fragShaderText.append(
"#extension GL_ARB_separate_shader_objects : enable\n"
"#extension GL_ARB_shading_language_420pack : enable\n"
"layout(set = 1, binding = 0) uniform sampler2D uTexture;"
"layout(location = 1) in float2 vTexCoord;"
"// Copy Program FS\n"
"void main() {"
"sk_FragColor = texture(uTexture, vTexCoord);"
"}"
);
SkSL::Program::Settings settings;
SkSL::Program::Inputs inputs;
id<MTLLibrary> vertexLibrary = GrCompileMtlShaderLibrary(fGpu, vertShaderText.c_str(),
SkSL::Program::kVertex_Kind,
settings, &inputs);
SkASSERT(inputs.isEmpty());
SkASSERT(vertexLibrary);
id<MTLLibrary> fragmentLibrary = GrCompileMtlShaderLibrary(fGpu, fragShaderText.c_str(),
SkSL::Program::kFragment_Kind,
settings, &inputs);
SkASSERT(inputs.isEmpty());
SkASSERT(fragmentLibrary);
id<MTLFunction> vertexFunction = [vertexLibrary newFunctionWithName: @"vertexMain"];
id<MTLFunction> fragmentFunction = [fragmentLibrary newFunctionWithName: @"fragmentMain"];
SkASSERT(vertexFunction);
SkASSERT(fragmentFunction);
fVertexFunction = vertexFunction;
fFragmentFunction = fragmentFunction;
}
void GrMtlCopyManager::createCopyProgramVertexDescriptor() {
// Create vertex descriptor for pipeline state
// Expected [[stage_in]] (vertex attribute) MSL format for copies:
//
// struct Input {
// float2 inPosition [[attribute(0)]];
// };
MTLVertexDescriptor* vertexDescriptor = [[MTLVertexDescriptor alloc] init];
vertexDescriptor.attributes[0].format = MTLVertexFormatFloat2;
vertexDescriptor.attributes[0].offset = 0;
vertexDescriptor.attributes[0].bufferIndex = kAttribute_BufferIndex;
vertexDescriptor.layouts[kAttribute_BufferIndex].stepFunction = MTLVertexStepFunctionPerVertex;
vertexDescriptor.layouts[kAttribute_BufferIndex].stepRate = 1;
vertexDescriptor.layouts[kAttribute_BufferIndex].stride = sizeof(simd::float2);
fVertexDescriptor = vertexDescriptor;
}
void GrMtlCopyManager::createCopyProgram() {
TRACE_EVENT0("skia", TRACE_FUNC);
MTLSamplerDescriptor* samplerDescriptor = [[MTLSamplerDescriptor alloc] init];
fSamplerState = [fGpu->device() newSamplerStateWithDescriptor: samplerDescriptor];
this->createCopyProgramBuffer();
this->createCopyProgramShaders();
this->createCopyProgramVertexDescriptor();
}
bool GrMtlCopyManager::copySurfaceAsDraw(GrSurface* dst, GrSurfaceOrigin dstOrigin,
GrSurface* src, GrSurfaceOrigin srcOrigin,
const SkIRect& srcRect, const SkIPoint& dstPoint,
bool canDiscardOutsideDstRect) {
SkASSERT(fGpu->mtlCaps().canCopyAsDraw(dst->config(), SkToBool(dst->asRenderTarget()),
src->config(), SkToBool(src->asTexture())));
id<MTLTexture> dstTex = GrGetMTLTextureFromSurface(dst, false);
id<MTLTexture> srcTex = GrGetMTLTextureFromSurface(src, false);
if (fSamplerState == nil) {
SkASSERT(fVertexAttributeBuffer == nil);
SkASSERT(fVertexFunction == nil);
SkASSERT(fFragmentFunction == nil);
SkASSERT(fVertexDescriptor == nil);
this->createCopyProgram();
}
if (!(fSamplerState && fVertexAttributeBuffer && fVertexFunction &&
fFragmentFunction && fVertexDescriptor)) {
SkASSERT(false);
return false;
}
// UPDATE UNIFORM DESCRIPTOR SET
int w = srcRect.width();
int h = srcRect.height();
// dst rect edges in NDC (-1 to 1)
int dw = dstTex.width;
int dh = dstTex.height;
float dx0 = 2.f * dstPoint.fX / dw - 1.f;
float dx1 = 2.f * (dstPoint.fX + w) / dw - 1.f;
float dy0 = 2.f * dstPoint.fY / dh - 1.f;
float dy1 = 2.f * (dstPoint.fY + h) / dh - 1.f;
if (kBottomLeft_GrSurfaceOrigin == dstOrigin) {
dy0 = -dy0;
dy1 = -dy1;
}
float sx0 = (float)srcRect.fLeft;
float sx1 = (float)(srcRect.fLeft + w);
float sy0 = (float)srcRect.fTop;
float sy1 = (float)(srcRect.fTop + h);
int sh = srcTex.height;
if (kBottomLeft_GrSurfaceOrigin == srcOrigin) {
sy0 = sh - sy0;
sy1 = sh - sy1;
}
// src rect edges in normalized texture space (0 to 1).
int sw = srcTex.width;
sx0 /= sw;
sx1 /= sw;
sy0 /= sh;
sy1 /= sh;
const simd::float4 vertexUniformBuffer[2] = {
{dx1 - dx0, dy1 - dy0, dx0, dy0}, // posXform
{sx1 - sx0, sy1 - sy0, sx0, sy0}, // texCoordXform
};
MTLRenderPassDescriptor* renderPassDesc = [[MTLRenderPassDescriptor alloc] init];
renderPassDesc.colorAttachments[0].texture = dstTex;
renderPassDesc.colorAttachments[0].slice = 0;
renderPassDesc.colorAttachments[0].level = 0;
renderPassDesc.colorAttachments[0].loadAction = canDiscardOutsideDstRect ? MTLLoadActionDontCare
: MTLLoadActionLoad;
renderPassDesc.colorAttachments[0].storeAction = MTLStoreActionStore;
id<MTLRenderCommandEncoder> renderCmdEncoder =
[fGpu->commandBuffer() renderCommandEncoderWithDescriptor: renderPassDesc];
GrMtlCopyPipelineState* copyPipelineState =
fGpu->resourceProvider().findOrCreateCopyPipelineState(dstTex.pixelFormat,
fVertexFunction,
fFragmentFunction,
fVertexDescriptor);
[renderCmdEncoder setRenderPipelineState: copyPipelineState->mtlCopyPipelineState()];
[renderCmdEncoder setVertexBuffer: fVertexAttributeBuffer
offset: 0
atIndex: kAttribute_BufferIndex];
[renderCmdEncoder setVertexBytes: vertexUniformBuffer
length: sizeof(vertexUniformBuffer)
atIndex: kUniform_BufferIndex];
[renderCmdEncoder setFragmentTexture: srcTex
atIndex: 0];
[renderCmdEncoder setFragmentSamplerState: fSamplerState
atIndex: 0];
[renderCmdEncoder drawPrimitives: MTLPrimitiveTypeTriangleStrip
vertexStart: 0
vertexCount: 4];
[renderCmdEncoder endEncoding];
return true;
}
bool GrMtlCopyManager::IsCompatible(const GrMtlCopyPipelineState* pipelineState,
MTLPixelFormat dstPixelFormat) {
return pipelineState->fPixelFormat == dstPixelFormat;
}
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