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>
writeFragmentOutput(const FragmentShadingContext & context,int packetNdx,int fragNdx,int outputNdx,const T & value)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>
readPointVarying(const FragmentPacket & packet,const FragmentShadingContext & context,int varyingLoc,int fragNdx)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>
readLineVarying(const FragmentPacket & packet,const FragmentShadingContext & context,int varyingLoc,int fragNdx)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>
readTriangleVarying(const FragmentPacket & packet,const FragmentShadingContext & context,int varyingLoc,int fragNdx)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>
readVarying(const FragmentPacket & packet,const FragmentShadingContext & context,int varyingLoc,int fragNdx)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>
dFdxLocal(tcu::Vector<T,Size> outFragmentdFdx[4],const tcu::Vector<T,Size> func[4])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>
dFdyLocal(tcu::Vector<T,Size> outFragmentdFdy[4],const tcu::Vector<T,Size> func[4])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>
dFdxVarying(tcu::Vector<T,4> outFragmentdFdx[4],const FragmentPacket & packet,const FragmentShadingContext & context,int varyingLoc)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>
dFdyVarying(tcu::Vector<T,4> outFragmentdFdy[4],const FragmentPacket & packet,const FragmentShadingContext & context,int varyingLoc)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
readFragmentDepth(const FragmentShadingContext & context,int packetNdx,int fragNdx,int sampleNdx)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
writeFragmentDepth(const FragmentShadingContext & context,int packetNdx,int fragNdx,int sampleNdx,float depthValue)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