1#ifndef _RRSHADINGCONTEXT_HPP 2#define _RRSHADINGCONTEXT_HPP 3/*------------------------------------------------------------------------- 4 * drawElements Quality Program Reference Renderer 5 * ----------------------------------------------- 6 * 7 * Copyright 2014 The Android Open Source Project 8 * 9 * Licensed under the Apache License, Version 2.0 (the "License"); 10 * you may not use this file except in compliance with the License. 11 * You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 * 21 *//*! 22 * \file 23 * \brief Shading context 24 *//*--------------------------------------------------------------------*/ 25 26#include "rrDefs.hpp" 27#include "rrGenericVector.hpp" 28#include "rrFragmentPacket.hpp" 29 30namespace rr 31{ 32 33/*--------------------------------------------------------------------*//*! 34 * \brief Fragment shading context 35 * 36 * Contains per-primitive information used in fragment shading 37 *//*--------------------------------------------------------------------*/ 38struct FragmentShadingContext 39{ 40 FragmentShadingContext (const GenericVec4* varying0, const GenericVec4* varying1, const GenericVec4* varying2, GenericVec4* outputArray, float* fragmentDepths, int primitiveID, int numFragmentOutputs, int numSamples, FaceType visibleFace_); 41 42 const GenericVec4* varyings[3]; //!< Vertex shader outputs. Pointer will be NULL if there is no such vertex. 43 GenericVec4* const outputArray; //!< Fragment output array 44 const int primitiveID; //!< Geometry shader output 45 const int numFragmentOutputs; //!< Fragment output count 46 const int numSamples; //!< Number of samples 47 float* fragmentDepths; //!< Fragment packet depths. Pointer will be NULL if there is no depth buffer. Each sample has per-sample depth values 48 FaceType visibleFace; //!< Which face (front or back) is visible 49}; 50 51// Write output 52 53template <typename T> 54void writeFragmentOutput (const FragmentShadingContext& context, int packetNdx, int fragNdx, int outputNdx, const T& value) 55{ 56 DE_ASSERT(packetNdx >= 0); 57 DE_ASSERT(fragNdx >= 0 && fragNdx < 4); 58 DE_ASSERT(outputNdx >= 0 && outputNdx < context.numFragmentOutputs); 59 60 context.outputArray[outputNdx + context.numFragmentOutputs*(fragNdx + packetNdx*4)] = value; 61} 62 63// Read Varying 64 65template <typename T> 66tcu::Vector<T, 4> readPointVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx) 67{ 68 DE_UNREF(fragNdx); 69 DE_UNREF(packet); 70 71 return context.varyings[0][varyingLoc].get<T>(); 72} 73 74template <typename T> 75tcu::Vector<T, 4> readLineVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx) 76{ 77 return packet.barycentric[0][fragNdx] * context.varyings[0][varyingLoc].get<T>() 78 + packet.barycentric[1][fragNdx] * context.varyings[1][varyingLoc].get<T>(); 79} 80 81template <typename T> 82tcu::Vector<T, 4> readTriangleVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx) 83{ 84 return packet.barycentric[0][fragNdx] * context.varyings[0][varyingLoc].get<T>() 85 + packet.barycentric[1][fragNdx] * context.varyings[1][varyingLoc].get<T>() 86 + packet.barycentric[2][fragNdx] * context.varyings[2][varyingLoc].get<T>(); 87} 88 89template <typename T> 90tcu::Vector<T, 4> readVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx) 91{ 92 if (context.varyings[1] == DE_NULL) return readPointVarying<T> (packet, context, varyingLoc, fragNdx); 93 if (context.varyings[2] == DE_NULL) return readLineVarying<T> (packet, context, varyingLoc, fragNdx); 94 return readTriangleVarying<T> (packet, context, varyingLoc, fragNdx); 95} 96 97// Derivative 98 99template <typename T, int Size> 100void dFdxLocal (tcu::Vector<T, Size> outFragmentdFdx[4], const tcu::Vector<T, Size> func[4]) 101{ 102 const tcu::Vector<T, Size> dFdx[2] = 103 { 104 func[1] - func[0], 105 func[3] - func[2] 106 }; 107 108 outFragmentdFdx[0] = dFdx[0]; 109 outFragmentdFdx[1] = dFdx[0]; 110 outFragmentdFdx[2] = dFdx[1]; 111 outFragmentdFdx[3] = dFdx[1]; 112} 113 114template <typename T, int Size> 115void dFdyLocal (tcu::Vector<T, Size> outFragmentdFdy[4], const tcu::Vector<T, Size> func[4]) 116{ 117 const tcu::Vector<T, Size> dFdy[2] = 118 { 119 func[2] - func[0], 120 func[3] - func[1] 121 }; 122 123 outFragmentdFdy[0] = dFdy[0]; 124 outFragmentdFdy[1] = dFdy[1]; 125 outFragmentdFdy[2] = dFdy[0]; 126 outFragmentdFdy[3] = dFdy[1]; 127} 128 129template <typename T> 130inline void dFdxVarying (tcu::Vector<T, 4> outFragmentdFdx[4], const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc) 131{ 132 const tcu::Vector<T, 4> func[4] = 133 { 134 readVarying<T>(packet, context, varyingLoc, 0), 135 readVarying<T>(packet, context, varyingLoc, 1), 136 readVarying<T>(packet, context, varyingLoc, 2), 137 readVarying<T>(packet, context, varyingLoc, 3), 138 }; 139 140 dFdxLocal(outFragmentdFdx, func); 141} 142 143template <typename T> 144inline void dFdyVarying (tcu::Vector<T, 4> outFragmentdFdy[4], const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc) 145{ 146 const tcu::Vector<T, 4> func[4] = 147 { 148 readVarying<T>(packet, context, varyingLoc, 0), 149 readVarying<T>(packet, context, varyingLoc, 1), 150 readVarying<T>(packet, context, varyingLoc, 2), 151 readVarying<T>(packet, context, varyingLoc, 3), 152 }; 153 154 dFdyLocal(outFragmentdFdy, func); 155} 156 157// Fragent depth 158 159inline float readFragmentDepth (const FragmentShadingContext& context, int packetNdx, int fragNdx, int sampleNdx) 160{ 161 // Reading or writing to fragment depth values while there is no depth buffer is legal but not supported by rr 162 DE_ASSERT(context.fragmentDepths); 163 return context.fragmentDepths[(packetNdx * 4 + fragNdx) * context.numSamples + sampleNdx]; 164} 165 166inline void writeFragmentDepth (const FragmentShadingContext& context, int packetNdx, int fragNdx, int sampleNdx, float depthValue) 167{ 168 // Reading or writing to fragment depth values while there is no depth buffer is legal but not supported by rr 169 DE_ASSERT(context.fragmentDepths); 170 context.fragmentDepths[(packetNdx * 4 + fragNdx) * context.numSamples + sampleNdx] = depthValue; 171} 172 173} // rr 174 175#endif // _RRSHADINGCONTEXT_HPP 176