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comparison: gfx/angle/src/compiler/VersionGLSL.cpp
gfx/angle/src/compiler/VersionGLSL.cpp
- branch
- TOR_BUG_9701
- changeset 3
- 141e0f1194b1
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| -1:000000000000 | 0:5f19ad1dbf37 |
|---|---|
| 1 // | |
| 2 // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved. | |
| 3 // Use of this source code is governed by a BSD-style license that can be | |
| 4 // found in the LICENSE file. | |
| 5 // | |
| 6 | |
| 7 #include "compiler/VersionGLSL.h" | |
| 8 | |
| 9 static const int GLSL_VERSION_110 = 110; | |
| 10 static const int GLSL_VERSION_120 = 120; | |
| 11 | |
| 12 // We need to scan for the following: | |
| 13 // 1. "invariant" keyword: This can occur in both - vertex and fragment shaders | |
| 14 // but only at the global scope. | |
| 15 // 2. "gl_PointCoord" built-in variable: This can only occur in fragment shader | |
| 16 // but inside any scope. | |
| 17 // 3. Call to a matrix constructor with another matrix as argument. | |
| 18 // (These constructors were reserved in GLSL version 1.10.) | |
| 19 // 4. Arrays as "out" function parameters. | |
| 20 // GLSL spec section 6.1.1: "When calling a function, expressions that do | |
| 21 // not evaluate to l-values cannot be passed to parameters declared as | |
| 22 // out or inout." | |
| 23 // GLSL 1.1 section 5.8: "Other binary or unary expressions, | |
| 24 // non-dereferenced arrays, function names, swizzles with repeated fields, | |
| 25 // and constants cannot be l-values." | |
| 26 // GLSL 1.2 relaxed the restriction on arrays, section 5.8: "Variables that | |
| 27 // are built-in types, entire structures or arrays... are all l-values." | |
| 28 // | |
| 29 // TODO(alokp): The following two cases of invariant decalaration get lost | |
| 30 // during parsing - they do not get carried over to the intermediate tree. | |
| 31 // Handle these cases: | |
| 32 // 1. When a pragma is used to force all output variables to be invariant: | |
| 33 // - #pragma STDGL invariant(all) | |
| 34 // 2. When a previously decalared or built-in variable is marked invariant: | |
| 35 // - invariant gl_Position; | |
| 36 // - varying vec3 color; invariant color; | |
| 37 // | |
| 38 TVersionGLSL::TVersionGLSL(ShShaderType type) | |
| 39 : mShaderType(type), | |
| 40 mVersion(GLSL_VERSION_110) | |
| 41 { | |
| 42 } | |
| 43 | |
| 44 void TVersionGLSL::visitSymbol(TIntermSymbol* node) | |
| 45 { | |
| 46 if (node->getSymbol() == "gl_PointCoord") | |
| 47 updateVersion(GLSL_VERSION_120); | |
| 48 } | |
| 49 | |
| 50 void TVersionGLSL::visitConstantUnion(TIntermConstantUnion*) | |
| 51 { | |
| 52 } | |
| 53 | |
| 54 bool TVersionGLSL::visitBinary(Visit, TIntermBinary*) | |
| 55 { | |
| 56 return true; | |
| 57 } | |
| 58 | |
| 59 bool TVersionGLSL::visitUnary(Visit, TIntermUnary*) | |
| 60 { | |
| 61 return true; | |
| 62 } | |
| 63 | |
| 64 bool TVersionGLSL::visitSelection(Visit, TIntermSelection*) | |
| 65 { | |
| 66 return true; | |
| 67 } | |
| 68 | |
| 69 bool TVersionGLSL::visitAggregate(Visit, TIntermAggregate* node) | |
| 70 { | |
| 71 bool visitChildren = true; | |
| 72 | |
| 73 switch (node->getOp()) { | |
| 74 case EOpSequence: | |
| 75 // We need to visit sequence children to get to global or inner scope. | |
| 76 visitChildren = true; | |
| 77 break; | |
| 78 case EOpDeclaration: { | |
| 79 const TIntermSequence& sequence = node->getSequence(); | |
| 80 TQualifier qualifier = sequence.front()->getAsTyped()->getQualifier(); | |
| 81 if ((qualifier == EvqInvariantVaryingIn) || | |
| 82 (qualifier == EvqInvariantVaryingOut)) { | |
| 83 updateVersion(GLSL_VERSION_120); | |
| 84 } | |
| 85 break; | |
| 86 } | |
| 87 case EOpParameters: { | |
| 88 const TIntermSequence& params = node->getSequence(); | |
| 89 for (TIntermSequence::const_iterator iter = params.begin(); | |
| 90 iter != params.end(); ++iter) | |
| 91 { | |
| 92 const TIntermTyped* param = (*iter)->getAsTyped(); | |
| 93 if (param->isArray()) | |
| 94 { | |
| 95 TQualifier qualifier = param->getQualifier(); | |
| 96 if ((qualifier == EvqOut) || (qualifier == EvqInOut)) | |
| 97 { | |
| 98 updateVersion(GLSL_VERSION_120); | |
| 99 break; | |
| 100 } | |
| 101 } | |
| 102 } | |
| 103 // Fully processed. No need to visit children. | |
| 104 visitChildren = false; | |
| 105 break; | |
| 106 } | |
| 107 case EOpConstructMat2: | |
| 108 case EOpConstructMat3: | |
| 109 case EOpConstructMat4: { | |
| 110 const TIntermSequence& sequence = node->getSequence(); | |
| 111 if (sequence.size() == 1) { | |
| 112 TIntermTyped* typed = sequence.front()->getAsTyped(); | |
| 113 if (typed && typed->isMatrix()) { | |
| 114 updateVersion(GLSL_VERSION_120); | |
| 115 } | |
| 116 } | |
| 117 break; | |
| 118 } | |
| 119 | |
| 120 default: break; | |
| 121 } | |
| 122 | |
| 123 return visitChildren; | |
| 124 } | |
| 125 | |
| 126 bool TVersionGLSL::visitLoop(Visit, TIntermLoop*) | |
| 127 { | |
| 128 return true; | |
| 129 } | |
| 130 | |
| 131 bool TVersionGLSL::visitBranch(Visit, TIntermBranch*) | |
| 132 { | |
| 133 return true; | |
| 134 } | |
| 135 | |
| 136 void TVersionGLSL::updateVersion(int version) | |
| 137 { | |
| 138 mVersion = std::max(version, mVersion); | |
| 139 } | |
| 140 |
