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 30 namespace rr 31 { 32 33 /*--------------------------------------------------------------------*//*! 34 * \brief Fragment shading context 35 * 36 * Contains per-primitive information used in fragment shading 37 *//*--------------------------------------------------------------------*/ 38 struct FragmentShadingContext 39 { 40 FragmentShadingContext (const GenericVec4* varying0, const GenericVec4* varying1, const GenericVec4* varying2, GenericVec4* outputArray, float* fragmentDepths, int primitiveID, int numFragmentOutputs, int numSamples); 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 }; 49 50 // Write output 51 52 template <typename T> 53 void writeFragmentOutput (const FragmentShadingContext& context, int packetNdx, int fragNdx, int outputNdx, const T& value) 54 { 55 DE_ASSERT(packetNdx >= 0); 56 DE_ASSERT(fragNdx >= 0 && fragNdx < 4); 57 DE_ASSERT(outputNdx >= 0 && outputNdx < context.numFragmentOutputs); 58 59 context.outputArray[outputNdx + context.numFragmentOutputs*(fragNdx + packetNdx*4)] = value; 60 } 61 62 // Read Varying 63 64 template <typename T> 65 tcu::Vector<T, 4> readPointVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx) 66 { 67 DE_UNREF(fragNdx); 68 DE_UNREF(packet); 69 70 return context.varyings[0][varyingLoc].get<T>(); 71 } 72 73 template <typename T> 74 tcu::Vector<T, 4> readLineVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx) 75 { 76 return packet.barycentric[0][fragNdx] * context.varyings[0][varyingLoc].get<T>() 77 + packet.barycentric[1][fragNdx] * context.varyings[1][varyingLoc].get<T>(); 78 } 79 80 template <typename T> 81 tcu::Vector<T, 4> readTriangleVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx) 82 { 83 return packet.barycentric[0][fragNdx] * context.varyings[0][varyingLoc].get<T>() 84 + packet.barycentric[1][fragNdx] * context.varyings[1][varyingLoc].get<T>() 85 + packet.barycentric[2][fragNdx] * context.varyings[2][varyingLoc].get<T>(); 86 } 87 88 template <typename T> 89 tcu::Vector<T, 4> readVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx) 90 { 91 if (context.varyings[1] == DE_NULL) return readPointVarying<T> (packet, context, varyingLoc, fragNdx); 92 if (context.varyings[2] == DE_NULL) return readLineVarying<T> (packet, context, varyingLoc, fragNdx); 93 return readTriangleVarying<T> (packet, context, varyingLoc, fragNdx); 94 } 95 96 // Derivative 97 98 template <typename T, int Size> 99 void dFdxLocal (tcu::Vector<T, Size> outFragmentdFdx[4], const tcu::Vector<T, Size> func[4]) 100 { 101 const tcu::Vector<T, Size> dFdx[2] = 102 { 103 func[1] - func[0], 104 func[3] - func[2] 105 }; 106 107 outFragmentdFdx[0] = dFdx[0]; 108 outFragmentdFdx[1] = dFdx[0]; 109 outFragmentdFdx[2] = dFdx[1]; 110 outFragmentdFdx[3] = dFdx[1]; 111 } 112 113 template <typename T, int Size> 114 void dFdyLocal (tcu::Vector<T, Size> outFragmentdFdy[4], const tcu::Vector<T, Size> func[4]) 115 { 116 const tcu::Vector<T, Size> dFdy[2] = 117 { 118 func[2] - func[0], 119 func[3] - func[1] 120 }; 121 122 outFragmentdFdy[0] = dFdy[0]; 123 outFragmentdFdy[1] = dFdy[1]; 124 outFragmentdFdy[2] = dFdy[0]; 125 outFragmentdFdy[3] = dFdy[1]; 126 } 127 128 template <typename T> 129 inline void dFdxVarying (tcu::Vector<T, 4> outFragmentdFdx[4], const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc) 130 { 131 const tcu::Vector<T, 4> func[4] = 132 { 133 readVarying<T>(packet, context, varyingLoc, 0), 134 readVarying<T>(packet, context, varyingLoc, 1), 135 readVarying<T>(packet, context, varyingLoc, 2), 136 readVarying<T>(packet, context, varyingLoc, 3), 137 }; 138 139 dFdxLocal(outFragmentdFdx, func); 140 } 141 142 template <typename T> 143 inline void dFdyVarying (tcu::Vector<T, 4> outFragmentdFdy[4], const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc) 144 { 145 const tcu::Vector<T, 4> func[4] = 146 { 147 readVarying<T>(packet, context, varyingLoc, 0), 148 readVarying<T>(packet, context, varyingLoc, 1), 149 readVarying<T>(packet, context, varyingLoc, 2), 150 readVarying<T>(packet, context, varyingLoc, 3), 151 }; 152 153 dFdyLocal(outFragmentdFdy, func); 154 } 155 156 // Fragent depth 157 158 inline float readFragmentDepth (const FragmentShadingContext& context, int packetNdx, int fragNdx, int sampleNdx) 159 { 160 // Reading or writing to fragment depth values while there is no depth buffer is legal but not supported by rr 161 DE_ASSERT(context.fragmentDepths); 162 return context.fragmentDepths[(packetNdx * 4 + fragNdx) * context.numSamples + sampleNdx]; 163 } 164 165 inline void writeFragmentDepth (const FragmentShadingContext& context, int packetNdx, int fragNdx, int sampleNdx, float depthValue) 166 { 167 // Reading or writing to fragment depth values while there is no depth buffer is legal but not supported by rr 168 DE_ASSERT(context.fragmentDepths); 169 context.fragmentDepths[(packetNdx * 4 + fragNdx) * context.numSamples + sampleNdx] = depthValue; 170 } 171 172 } // rr 173 174 #endif // _RRSHADINGCONTEXT_HPP 175
