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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 "mtlPtexMipmapTexture.h"
#include "ptexMipmapTextureLoader.h"
#include <opensubdiv/far/error.h>
#include <Metal/Metal.h>
#include <cassert>
#include "mtlUtils.h"
using namespace OpenSubdiv;
MTLPtexMipmapTexture::MTLPtexMipmapTexture() :
_layout(nil), _texels(nil), _textureDescriptor(nil) {
}
const char* MTLPtexMipmapTexture::GetShaderSource() {
static const char* shaderSource =
#include "mtlPtexCommon.gen.h"
;
return shaderSource;
}
MTLPtexMipmapTexture * MTLPtexMipmapTexture::Create(Osd::MTLContext *deviceContext, PtexTexture *reader, int maxLevels) {
const auto maxNumPages = 2048;
size_t targetMemory = 0;
// Read the ptex data and pack the texels
bool padAlpha = reader->numChannels()==3;
PtexMipmapTextureLoader loader(reader,
maxNumPages,
maxLevels,
targetMemory,
true/*seemlessMipmap*/,
padAlpha);
const auto numFaces = loader.GetNumFaces();
const auto layoutBuffer = [deviceContext->device newBufferWithBytes:loader.GetLayoutBuffer() length:numFaces * 6 * sizeof(short) options:Osd::MTLDefaultStorageMode];
const auto textureDescriptor = [MTLTextureDescriptor new];
int bpp = 0;
textureDescriptor.pixelFormat = [&]() {
const auto numChannels = reader->numChannels() + padAlpha;
switch(reader->dataType()) {
case Ptex::dt_uint16:
bpp = sizeof(short) * numChannels;
switch(numChannels) {
case 1: return MTLPixelFormatR16Unorm;
case 2: return MTLPixelFormatRG16Unorm;
case 3: assert("RGB16Uint not supported"); break;
case 4: return MTLPixelFormatRGBA16Unorm;
}
case Ptex::dt_float:
bpp = sizeof(float) * numChannels;
switch(numChannels) {
case 1: return MTLPixelFormatR32Float;
case 2: return MTLPixelFormatRG32Float;
case 3: assert("RGB32Float not supported"); break;
case 4: return MTLPixelFormatRGBA32Float;
}
case Ptex::dt_half:
bpp = sizeof(short) * numChannels;
switch(numChannels) {
case 1: return MTLPixelFormatR16Float;
case 2: return MTLPixelFormatRG16Float;
case 3: assert("RGB16Float not supported"); break;
case 4: return MTLPixelFormatRGBA16Float;
}
default:
bpp = numChannels;
switch(numChannels) {
case 1: return MTLPixelFormatR8Unorm;
case 2: return MTLPixelFormatRG8Unorm;
case 3: assert("RGB8Unorm not supported"); break;
case 4: return MTLPixelFormatRGBA8Unorm;
}
}
return MTLPixelFormatInvalid;
}();
textureDescriptor.width = loader.GetPageWidth();
textureDescriptor.height = loader.GetPageHeight();
textureDescriptor.arrayLength = loader.GetNumPages();
textureDescriptor.mipmapLevelCount = 1;
textureDescriptor.usage = MTLTextureUsageShaderRead;
textureDescriptor.textureType = MTLTextureType2DArray;
const auto texelsTexture = [deviceContext->device newTextureWithDescriptor:textureDescriptor];
if(!texelsTexture)
return nullptr;
auto result = new MTLPtexMipmapTexture();
result->_textureDescriptor = textureDescriptor;
result->_layout = layoutBuffer;
result->_texels = texelsTexture;
MTLRegion replaceRegion = MTLRegionMake2D(0, 0, loader.GetPageWidth(), loader.GetPageHeight());
const auto bytesPerRow = loader.GetPageWidth() * bpp;
const auto bytesPerImage = bytesPerRow * loader.GetPageHeight();
for(auto i = 0; i < loader.GetNumPages(); i++) {
[texelsTexture replaceRegion:replaceRegion mipmapLevel:0 slice:i
withBytes:loader.GetTexelBuffer() + i * bytesPerImage bytesPerRow:bytesPerRow bytesPerImage:bytesPerImage];
}
return result;
}
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