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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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tree10027f336435511475e392454359edea8e25895d /gfx/angle/src/libANGLE/renderer/d3d/VaryingPacking.cpp
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Add m-esr52 at 52.6.0
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+//
+// Copyright 2015 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// VaryingPacking:
+// Class which describes a mapping from varyings to registers in D3D
+// for linking between shader stages.
+//
+
+#include "libANGLE/renderer/d3d/VaryingPacking.h"
+
+#include "common/utilities.h"
+#include "compiler/translator/blocklayoutHLSL.h"
+#include "libANGLE/renderer/d3d/DynamicHLSL.h"
+#include "libANGLE/renderer/d3d/ProgramD3D.h"
+
+namespace rx
+{
+
+// Implementation of VaryingPacking::BuiltinVarying
+VaryingPacking::BuiltinVarying::BuiltinVarying() : enabled(false), index(0), systemValue(false)
+{
+}
+
+std::string VaryingPacking::BuiltinVarying::str() const
+{
+ return (systemValue ? semantic : (semantic + Str(index)));
+}
+
+void VaryingPacking::BuiltinVarying::enableSystem(const std::string &systemValueSemantic)
+{
+ enabled = true;
+ semantic = systemValueSemantic;
+ systemValue = true;
+}
+
+void VaryingPacking::BuiltinVarying::enable(const std::string &semanticVal, unsigned int indexVal)
+{
+ enabled = true;
+ semantic = semanticVal;
+ index = indexVal;
+}
+
+// Implementation of VaryingPacking
+VaryingPacking::VaryingPacking(GLuint maxVaryingVectors)
+ : mRegisterMap(maxVaryingVectors), mBuiltinInfo(SHADER_TYPE_MAX)
+{
+}
+
+// Packs varyings into generic varying registers, using the algorithm from
+// See [OpenGL ES Shading Language 1.00 rev. 17] appendix A section 7 page 111
+// Also [OpenGL ES Shading Language 3.00 rev. 4] Section 11 page 119
+// Returns false if unsuccessful.
+bool VaryingPacking::packVarying(const PackedVarying &packedVarying)
+{
+ unsigned int varyingRows = 0;
+ unsigned int varyingColumns = 0;
+
+ const auto &varying = *packedVarying.varying;
+
+ // "Non - square matrices of type matCxR consume the same space as a square matrix of type matN
+ // where N is the greater of C and R.Variables of type mat2 occupies 2 complete rows."
+ // Here we are a bit more conservative and allow packing non-square matrices more tightly.
+ // Make sure we use transposed matrix types to count registers correctly.
+ ASSERT(!varying.isStruct());
+ GLenum transposedType = gl::TransposeMatrixType(varying.type);
+ varyingRows = gl::VariableRowCount(transposedType);
+ varyingColumns = gl::VariableColumnCount(transposedType);
+
+ // "Arrays of size N are assumed to take N times the size of the base type"
+ varyingRows *= varying.elementCount();
+
+ unsigned int maxVaryingVectors = static_cast<unsigned int>(mRegisterMap.size());
+
+ if (varyingRows > maxVaryingVectors) {
+ return false;
+ }
+
+ // "For 2, 3 and 4 component variables packing is started using the 1st column of the 1st row.
+ // Variables are then allocated to successive rows, aligning them to the 1st column."
+ if (varyingColumns >= 2 && varyingColumns <= 4)
+ {
+ for (unsigned int row = 0; row <= maxVaryingVectors - varyingRows; ++row)
+ {
+ if (isFree(row, 0, varyingRows, varyingColumns))
+ {
+ insert(row, 0, packedVarying);
+ return true;
+ }
+ }
+
+ // "For 2 component variables, when there are no spare rows, the strategy is switched to
+ // using the highest numbered row and the lowest numbered column where the variable will
+ // fit."
+ if (varyingColumns == 2)
+ {
+ for (unsigned int r = maxVaryingVectors - varyingRows + 1; r-- >= 1;)
+ {
+ if (isFree(r, 2, varyingRows, 2))
+ {
+ insert(r, 2, packedVarying);
+ return true;
+ }
+ }
+ }
+
+ return false;
+ }
+
+ // "1 component variables have their own packing rule. They are packed in order of size, largest
+ // first. Each variable is placed in the column that leaves the least amount of space in the
+ // column and aligned to the lowest available rows within that column."
+ ASSERT(varyingColumns == 1);
+ unsigned int contiguousSpace[4] = {0};
+ unsigned int bestContiguousSpace[4] = {0};
+ unsigned int totalSpace[4] = {0};
+
+ for (unsigned int row = 0; row < maxVaryingVectors; ++row)
+ {
+ for (unsigned int column = 0; column < 4; ++column)
+ {
+ if (mRegisterMap[row][column])
+ {
+ contiguousSpace[column] = 0;
+ }
+ else
+ {
+ contiguousSpace[column]++;
+ totalSpace[column]++;
+
+ if (contiguousSpace[column] > bestContiguousSpace[column])
+ {
+ bestContiguousSpace[column] = contiguousSpace[column];
+ }
+ }
+ }
+ }
+
+ unsigned int bestColumn = 0;
+ for (unsigned int column = 1; column < 4; ++column)
+ {
+ if (bestContiguousSpace[column] >= varyingRows &&
+ (bestContiguousSpace[bestColumn] < varyingRows ||
+ totalSpace[column] < totalSpace[bestColumn]))
+ {
+ bestColumn = column;
+ }
+ }
+
+ if (bestContiguousSpace[bestColumn] >= varyingRows)
+ {
+ for (unsigned int row = 0; row < maxVaryingVectors; row++)
+ {
+ if (isFree(row, bestColumn, varyingRows, 1))
+ {
+ for (unsigned int arrayIndex = 0; arrayIndex < varyingRows; ++arrayIndex)
+ {
+ // If varyingRows > 1, it must be an array.
+ PackedVaryingRegister registerInfo;
+ registerInfo.packedVarying = &packedVarying;
+ registerInfo.registerRow = row + arrayIndex;
+ registerInfo.registerColumn = bestColumn;
+ registerInfo.varyingArrayIndex = arrayIndex;
+ registerInfo.varyingRowIndex = 0;
+ mRegisterList.push_back(registerInfo);
+ mRegisterMap[row + arrayIndex][bestColumn] = true;
+ }
+ break;
+ }
+ }
+ return true;
+ }
+
+ return false;
+}
+
+bool VaryingPacking::isFree(unsigned int registerRow,
+ unsigned int registerColumn,
+ unsigned int varyingRows,
+ unsigned int varyingColumns) const
+{
+ for (unsigned int row = 0; row < varyingRows; ++row)
+ {
+ ASSERT(registerRow + row < mRegisterMap.size());
+ for (unsigned int column = 0; column < varyingColumns; ++column)
+ {
+ ASSERT(registerColumn + column < 4);
+ if (mRegisterMap[registerRow + row][registerColumn + column])
+ {
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
+
+void VaryingPacking::insert(unsigned int registerRow,
+ unsigned int registerColumn,
+ const PackedVarying &packedVarying)
+{
+ unsigned int varyingRows = 0;
+ unsigned int varyingColumns = 0;
+
+ const auto &varying = *packedVarying.varying;
+ ASSERT(!varying.isStruct());
+ GLenum transposedType = gl::TransposeMatrixType(varying.type);
+ varyingRows = gl::VariableRowCount(transposedType);
+ varyingColumns = gl::VariableColumnCount(transposedType);
+
+ PackedVaryingRegister registerInfo;
+ registerInfo.packedVarying = &packedVarying;
+ registerInfo.registerColumn = registerColumn;
+
+ for (unsigned int arrayElement = 0; arrayElement < varying.elementCount(); ++arrayElement)
+ {
+ for (unsigned int varyingRow = 0; varyingRow < varyingRows; ++varyingRow)
+ {
+ registerInfo.registerRow = registerRow + (arrayElement * varyingRows) + varyingRow;
+ registerInfo.varyingRowIndex = varyingRow;
+ registerInfo.varyingArrayIndex = arrayElement;
+ mRegisterList.push_back(registerInfo);
+
+ for (unsigned int columnIndex = 0; columnIndex < varyingColumns; ++columnIndex)
+ {
+ mRegisterMap[registerInfo.registerRow][registerColumn + columnIndex] = true;
+ }
+ }
+ }
+}
+
+// See comment on packVarying.
+bool VaryingPacking::packVaryings(gl::InfoLog &infoLog,
+ const std::vector<PackedVarying> &packedVaryings,
+ const std::vector<std::string> &transformFeedbackVaryings)
+{
+ std::set<std::string> uniqueVaryingNames;
+
+ // "Variables are packed into the registers one at a time so that they each occupy a contiguous
+ // subrectangle. No splitting of variables is permitted."
+ for (const PackedVarying &packedVarying : packedVaryings)
+ {
+ const auto &varying = *packedVarying.varying;
+
+ // Do not assign registers to built-in or unreferenced varyings
+ if (varying.isBuiltIn() || (!varying.staticUse && !packedVarying.isStructField()))
+ {
+ continue;
+ }
+
+ ASSERT(!varying.isStruct());
+ ASSERT(uniqueVaryingNames.count(varying.name) == 0);
+
+ if (packVarying(packedVarying))
+ {
+ uniqueVaryingNames.insert(varying.name);
+ }
+ else
+ {
+ infoLog << "Could not pack varying " << varying.name;
+ return false;
+ }
+ }
+
+ for (const std::string &transformFeedbackVaryingName : transformFeedbackVaryings)
+ {
+ if (transformFeedbackVaryingName.compare(0, 3, "gl_") == 0)
+ {
+ // do not pack builtin XFB varyings
+ continue;
+ }
+
+ bool found = false;
+ for (const PackedVarying &packedVarying : packedVaryings)
+ {
+ const auto &varying = *packedVarying.varying;
+
+ // Make sure transform feedback varyings aren't optimized out.
+ if (uniqueVaryingNames.count(transformFeedbackVaryingName) > 0)
+ {
+ found = true;
+ break;
+ }
+
+ if (transformFeedbackVaryingName == varying.name)
+ {
+ if (!packVarying(packedVarying))
+ {
+ infoLog << "Could not pack varying " << varying.name;
+ return false;
+ }
+
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ {
+ infoLog << "Transform feedback varying " << transformFeedbackVaryingName
+ << " does not exist in the vertex shader.";
+ return false;
+ }
+ }
+
+ // Sort the packed register list
+ std::sort(mRegisterList.begin(), mRegisterList.end());
+
+ // Assign semantic indices
+ for (unsigned int semanticIndex = 0;
+ semanticIndex < static_cast<unsigned int>(mRegisterList.size()); ++semanticIndex)
+ {
+ mRegisterList[semanticIndex].semanticIndex = semanticIndex;
+ }
+
+ return true;
+}
+
+unsigned int VaryingPacking::getRegisterCount() const
+{
+ unsigned int count = 0;
+
+ for (const Register &reg : mRegisterMap)
+ {
+ if (reg.data[0] || reg.data[1] || reg.data[2] || reg.data[3])
+ {
+ ++count;
+ }
+ }
+
+ if (mBuiltinInfo[SHADER_PIXEL].glFragCoord.enabled)
+ {
+ ++count;
+ }
+
+ if (mBuiltinInfo[SHADER_PIXEL].glPointCoord.enabled)
+ {
+ ++count;
+ }
+
+ return count;
+}
+
+void VaryingPacking::enableBuiltins(ShaderType shaderType,
+ const ProgramD3DMetadata &programMetadata)
+{
+ int majorShaderModel = programMetadata.getRendererMajorShaderModel();
+ bool position = programMetadata.usesTransformFeedbackGLPosition();
+ bool fragCoord = programMetadata.usesFragCoord();
+ bool pointCoord = shaderType == SHADER_VERTEX ? programMetadata.addsPointCoordToVertexShader()
+ : programMetadata.usesPointCoord();
+ bool pointSize = programMetadata.usesSystemValuePointSize();
+ bool hlsl4 = (majorShaderModel >= 4);
+ const std::string &userSemantic = GetVaryingSemantic(majorShaderModel, pointSize);
+
+ unsigned int reservedSemanticIndex = getMaxSemanticIndex();
+
+ BuiltinInfo *builtins = &mBuiltinInfo[shaderType];
+
+ if (hlsl4)
+ {
+ builtins->dxPosition.enableSystem("SV_Position");
+ }
+ else if (shaderType == SHADER_PIXEL)
+ {
+ builtins->dxPosition.enableSystem("VPOS");
+ }
+ else
+ {
+ builtins->dxPosition.enableSystem("POSITION");
+ }
+
+ if (position)
+ {
+ builtins->glPosition.enable(userSemantic, reservedSemanticIndex++);
+ }
+
+ if (fragCoord)
+ {
+ builtins->glFragCoord.enable(userSemantic, reservedSemanticIndex++);
+ }
+
+ if (pointCoord)
+ {
+ // SM3 reserves the TEXCOORD semantic for point sprite texcoords (gl_PointCoord)
+ // In D3D11 we manually compute gl_PointCoord in the GS.
+ if (hlsl4)
+ {
+ builtins->glPointCoord.enable(userSemantic, reservedSemanticIndex++);
+ }
+ else
+ {
+ builtins->glPointCoord.enable("TEXCOORD", 0);
+ }
+ }
+
+ // Special case: do not include PSIZE semantic in HLSL 3 pixel shaders
+ if (pointSize && (shaderType != SHADER_PIXEL || hlsl4))
+ {
+ builtins->glPointSize.enableSystem("PSIZE");
+ }
+}
+
+} // namespace rx