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| 1 /* |
| 2 * Copyright 2014 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef GrShaderVar_DEFINED |
| 9 #define GrShaderVar_DEFINED |
| 10 |
| 11 #include "GrTypesPriv.h" |
| 12 #include "SkString.h" |
| 13 |
| 14 class GrShaderVar { |
| 15 public: |
| 16 /** |
| 17 * Early versions of GLSL have Varying and Attribute; those are later |
| 18 * deprecated, but we still need to know whether a Varying variable |
| 19 * should be treated as In or Out. |
| 20 * |
| 21 * TODO This really shouldn't live here, but until we have c++11, there is r
eally no good way |
| 22 * to write extensible enums. In reality, only none, out, in, inout, and un
iform really |
| 23 * make sense on this base class |
| 24 */ |
| 25 enum TypeModifier { |
| 26 kNone_TypeModifier, |
| 27 kOut_TypeModifier, |
| 28 kIn_TypeModifier, |
| 29 kInOut_TypeModifier, |
| 30 kUniform_TypeModifier, |
| 31 // GL Specific types below |
| 32 kAttribute_TypeModifier, |
| 33 kVaryingIn_TypeModifier, |
| 34 kVaryingOut_TypeModifier |
| 35 }; |
| 36 |
| 37 enum Precision { |
| 38 kLow_Precision, // lowp |
| 39 kMedium_Precision, // mediump |
| 40 kHigh_Precision, // highp |
| 41 kDefault_Precision, // Default for the current context. We make |
| 42 // fragment shaders default to mediump on ES2 |
| 43 // because highp support is not guaranteed (and |
| 44 // we haven't been motivated to test for it). |
| 45 // Otherwise, highp. |
| 46 }; |
| 47 |
| 48 /** |
| 49 * Defaults to a float with no precision specifier |
| 50 */ |
| 51 GrShaderVar() |
| 52 : fType(kFloat_GrSLType) |
| 53 , fTypeModifier(kNone_TypeModifier) |
| 54 , fCount(kNonArray) |
| 55 , fPrecision(kDefault_Precision) { |
| 56 } |
| 57 |
| 58 GrShaderVar(const char* name, GrSLType type, int arrayCount = kNonArray, |
| 59 Precision precision = kDefault_Precision) |
| 60 : fType(type) |
| 61 , fTypeModifier(kNone_TypeModifier) |
| 62 , fName(name) |
| 63 , fCount(arrayCount) |
| 64 , fPrecision(precision) { |
| 65 SkASSERT(kVoid_GrSLType != type); |
| 66 } |
| 67 |
| 68 GrShaderVar(const char* name, GrSLType type, TypeModifier typeModifier, |
| 69 int arrayCount = kNonArray, Precision precision = kDefault_Pre
cision) |
| 70 : fType(type) |
| 71 , fTypeModifier(typeModifier) |
| 72 , fName(name) |
| 73 , fCount(arrayCount) |
| 74 , fPrecision(precision) { |
| 75 SkASSERT(kVoid_GrSLType != type); |
| 76 } |
| 77 |
| 78 /** |
| 79 * Values for array count that have special meaning. We allow 1-sized arrays
. |
| 80 */ |
| 81 enum { |
| 82 kNonArray = 0, // not an array |
| 83 kUnsizedArray = -1, // an unsized array (declared with []) |
| 84 }; |
| 85 |
| 86 /** |
| 87 * Sets as a non-array. |
| 88 */ |
| 89 void set(GrSLType type, |
| 90 TypeModifier typeModifier, |
| 91 const SkString& name, |
| 92 Precision precision = kDefault_Precision) { |
| 93 SkASSERT(kVoid_GrSLType != type); |
| 94 fType = type; |
| 95 fTypeModifier = typeModifier; |
| 96 fName = name; |
| 97 fCount = kNonArray; |
| 98 fPrecision = precision; |
| 99 } |
| 100 |
| 101 /** |
| 102 * Sets as a non-array. |
| 103 */ |
| 104 void set(GrSLType type, |
| 105 TypeModifier typeModifier, |
| 106 const char* name, |
| 107 Precision precision = kDefault_Precision) { |
| 108 SkASSERT(kVoid_GrSLType != type); |
| 109 fType = type; |
| 110 fTypeModifier = typeModifier; |
| 111 fName = name; |
| 112 fCount = kNonArray; |
| 113 fPrecision = precision; |
| 114 } |
| 115 |
| 116 /** |
| 117 * Set all var options |
| 118 */ |
| 119 void set(GrSLType type, |
| 120 TypeModifier typeModifier, |
| 121 const SkString& name, |
| 122 int count, |
| 123 Precision precision = kDefault_Precision) { |
| 124 SkASSERT(kVoid_GrSLType != type); |
| 125 fType = type; |
| 126 fTypeModifier = typeModifier; |
| 127 fName = name; |
| 128 fCount = count; |
| 129 fPrecision = precision; |
| 130 } |
| 131 |
| 132 /** |
| 133 * Set all var options |
| 134 */ |
| 135 void set(GrSLType type, |
| 136 TypeModifier typeModifier, |
| 137 const char* name, |
| 138 int count, |
| 139 Precision precision = kDefault_Precision) { |
| 140 SkASSERT(kVoid_GrSLType != type); |
| 141 fType = type; |
| 142 fTypeModifier = typeModifier; |
| 143 fName = name; |
| 144 fCount = count; |
| 145 fPrecision = precision; |
| 146 } |
| 147 |
| 148 /** |
| 149 * Is the var an array. |
| 150 */ |
| 151 bool isArray() const { return kNonArray != fCount; } |
| 152 /** |
| 153 * Is this an unsized array, (i.e. declared with []). |
| 154 */ |
| 155 bool isUnsizedArray() const { return kUnsizedArray == fCount; } |
| 156 /** |
| 157 * Get the array length of the var. |
| 158 */ |
| 159 int getArrayCount() const { return fCount; } |
| 160 /** |
| 161 * Set the array length of the var |
| 162 */ |
| 163 void setArrayCount(int count) { fCount = count; } |
| 164 /** |
| 165 * Set to be a non-array. |
| 166 */ |
| 167 void setNonArray() { fCount = kNonArray; } |
| 168 /** |
| 169 * Set to be an unsized array. |
| 170 */ |
| 171 void setUnsizedArray() { fCount = kUnsizedArray; } |
| 172 |
| 173 /** |
| 174 * Access the var name as a writable string |
| 175 */ |
| 176 SkString* accessName() { return &fName; } |
| 177 /** |
| 178 * Set the var name |
| 179 */ |
| 180 void setName(const SkString& n) { fName = n; } |
| 181 void setName(const char* n) { fName = n; } |
| 182 |
| 183 /** |
| 184 * Get the var name. |
| 185 */ |
| 186 const SkString& getName() const { return fName; } |
| 187 |
| 188 /** |
| 189 * Shortcut for this->getName().c_str(); |
| 190 */ |
| 191 const char* c_str() const { return this->getName().c_str(); } |
| 192 |
| 193 /** |
| 194 * Get the type of the var |
| 195 */ |
| 196 GrSLType getType() const { return fType; } |
| 197 /** |
| 198 * Set the type of the var |
| 199 */ |
| 200 void setType(GrSLType type) { fType = type; } |
| 201 |
| 202 TypeModifier getTypeModifier() const { return fTypeModifier; } |
| 203 void setTypeModifier(TypeModifier type) { fTypeModifier = type; } |
| 204 |
| 205 /** |
| 206 * Get the precision of the var |
| 207 */ |
| 208 Precision getPrecision() const { return fPrecision; } |
| 209 |
| 210 /** |
| 211 * Set the precision of the var |
| 212 */ |
| 213 void setPrecision(Precision p) { fPrecision = p; } |
| 214 |
| 215 protected: |
| 216 GrSLType fType; |
| 217 TypeModifier fTypeModifier; |
| 218 SkString fName; |
| 219 int fCount; |
| 220 Precision fPrecision; |
| 221 }; |
| 222 |
| 223 #endif |
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