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//
// Copyright 2013 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
// names, trademarks, service marks, or product names of the Licensor
// and its affiliates, except as required to comply with Section 4(c) of
// the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#include "mtlControlMeshDisplay.h"
#include <cassert>
#include "mtlUtils.h"
static const char* s_Shader = R"(
#include <metal_stdlib>
using namespace metal;
float4 sharpnessToColor(float s) {
// 0.0 2.0 4.0
// green --- yellow --- red
return float4(min(1.0, s * 0.5),
min(1.0, 2.0 - s * 0.5),
0.0, 1.0);
}
struct DrawData
{
float4x4 ModelViewProjectionMatrix;
};
struct VertexData
{
float3 position [[attribute(0)]];
float sharpness [[attribute(1)]];
};
struct FragmentData
{
float4 position [[position]];
float4 color;
};
vertex FragmentData vs_main(VertexData in [[stage_in]],
const constant DrawData& drawData [[buffer(2)]]
)
{
FragmentData out;
out.position = drawData.ModelViewProjectionMatrix * float4(in.position, 1.0);
out.color = sharpnessToColor(in.sharpness);
return out;
}
fragment float4 fs_main(FragmentData in [[stage_in]])
{
return in.color;
}
)";
MTLControlMeshDisplay::MTLControlMeshDisplay(id<MTLDevice> device, MTLRenderPipelineDescriptor* pipelineDescriptor)
: _device(device), _displayEdges(false), _displayVertices(false), _numEdges(0), _numPoints(0) {
const auto result = createProgram(pipelineDescriptor);
assert(result && "Failed to create program for MTLControlMeshDisplay");
}
void MTLControlMeshDisplay::SetTopology(OpenSubdiv::Far::TopologyLevel const &level) {
using namespace OpenSubdiv;
_numEdges = level.GetNumEdges();
_numPoints = level.GetNumVertices();
std::vector<int> edgeIndices;
std::vector<float> edgeSharpness;
std::vector<float> vertSharpness;
edgeIndices.reserve(_numEdges * 2);
edgeSharpness.reserve(_numEdges);
vertSharpness.reserve(_numPoints);
for(int i = 0; i < _numEdges; i++) {
const auto verts = level.GetEdgeVertices(i);
edgeIndices.emplace_back(verts[0]);
edgeIndices.emplace_back(verts[1]);
edgeSharpness.emplace_back(level.GetEdgeSharpness(i));
}
for(int i = 0; i < _numPoints; i++) {
vertSharpness.emplace_back(level.GetVertexSharpness(i));
}
_edgeIndicesBuffer = Osd::MTLNewBufferFromVector(_device, edgeIndices);
_edgeSharpnessBuffer = Osd::MTLNewBufferFromVector(_device, edgeSharpness);
_vertexSharpnessBuffer = Osd::MTLNewBufferFromVector(_device, vertSharpness);
}
bool MTLControlMeshDisplay::createProgram(MTLRenderPipelineDescriptor* _pipelineDescriptor) {
const auto options = [MTLCompileOptions new];
NSError* error = nil;
const auto library = [_device newLibraryWithSource:@(s_Shader) options:options error:&error];
if(!library) {
printf("Failed to create library for MTLControlMeshDisplay\n%s\n", error ? [[error localizedDescription] UTF8String] : "");
return false;
}
const auto vertexFunction = [library newFunctionWithName:@"vs_main"];
const auto fragmentFunction = [library newFunctionWithName:@"fs_main"];
MTLRenderPipelineDescriptor* pipelineDescriptor = [_pipelineDescriptor copy];
pipelineDescriptor.vertexFunction = vertexFunction;
pipelineDescriptor.fragmentFunction = fragmentFunction;
const auto vertexDescriptor = pipelineDescriptor.vertexDescriptor;
vertexDescriptor.layouts[1].stride = sizeof(float) * 6;
vertexDescriptor.layouts[1].stepFunction = MTLVertexStepFunctionPerVertex;
vertexDescriptor.layouts[1].stepRate = 1;
vertexDescriptor.attributes[1].bufferIndex = 1;
vertexDescriptor.attributes[1].offset = 0;
vertexDescriptor.attributes[1].format = MTLVertexFormatFloat3;
_renderPipelineState = [_device newRenderPipelineStateWithDescriptor:pipelineDescriptor error:&error];
if(!_renderPipelineState) {
printf("Failed to create render pipeline state for MTLControlMeshDisplay\n%s\n", error ? [[error localizedDescription] UTF8String] : "");
}
return true;
}
void MTLControlMeshDisplay::Draw(id<MTLRenderCommandEncoder> encoder,
id<MTLBuffer> vertexBuffer,
const float *modelViewProjectionMatrix) {
[encoder setRenderPipelineState: _renderPipelineState];
[encoder setVertexBuffer:vertexBuffer offset:0 atIndex:0];
[encoder setVertexBytes:modelViewProjectionMatrix length: sizeof(float) * 16 atIndex:2];
if(_displayEdges) {
[encoder setVertexBuffer:_edgeSharpnessBuffer offset:0 atIndex:1];
[encoder drawIndexedPrimitives:MTLPrimitiveTypeLine
indexCount:_numEdges * 2
indexType:MTLIndexTypeUInt32
indexBuffer:_edgeIndicesBuffer
indexBufferOffset:0
instanceCount:1
baseVertex:0
baseInstance:0];
}
if(_displayVertices) {
[encoder setVertexBuffer:_vertexSharpnessBuffer offset:0 atIndex:1];
[encoder drawPrimitives:MTLPrimitiveTypePoint
vertexStart:0
vertexCount:_numPoints];
}
}
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