1 //
2 // Copyright (c) 2014 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 // queryconversions.cpp: Implementation of state query cast conversions
8 
9 #include "libANGLE/queryconversions.h"
10 
11 #include <vector>
12 
13 #include "libANGLE/Context.h"
14 #include "common/utilities.h"
15 
16 namespace gl
17 {
18 
19 namespace
20 {
21 
ExpandFloatToInteger(GLfloat value)22 GLint64 ExpandFloatToInteger(GLfloat value)
23 {
24     return static_cast<GLint64>((static_cast<double>(0xFFFFFFFFULL) * value - 1.0) / 2.0);
25 }
26 
27 template <typename QueryT, typename NativeT>
28 QueryT CastFromStateValueToInt(GLenum pname, NativeT value)
29 {
30     GLenum nativeType = GLTypeToGLenum<NativeT>::value;
31 
32     if (nativeType == GL_FLOAT)
33     {
34         // RGBA color values and DepthRangeF values are converted to integer using Equation 2.4 from Table 4.5
35         if (pname == GL_DEPTH_RANGE || pname == GL_COLOR_CLEAR_VALUE || pname == GL_DEPTH_CLEAR_VALUE || pname == GL_BLEND_COLOR)
36         {
37             return clampCast<QueryT>(ExpandFloatToInteger(static_cast<GLfloat>(value)));
38         }
39         else
40         {
41             return clampCast<QueryT>(std::round(value));
42         }
43     }
44 
45     return clampCast<QueryT>(value);
46 }
47 
48 template <typename NativeT, typename QueryT>
49 NativeT CastQueryValueToInt(GLenum pname, QueryT value)
50 {
51     GLenum queryType = GLTypeToGLenum<QueryT>::value;
52 
53     if (queryType == GL_FLOAT)
54     {
55         return static_cast<NativeT>(std::round(value));
56     }
57 
58     return static_cast<NativeT>(value);
59 }
60 
61 }  // anonymous namespace
62 
63 // ES 3.10 Section 2.2.2
64 // When querying bitmasks(such as SAMPLE_MASK_VALUE or STENCIL_WRITEMASK) with GetIntegerv, the
65 // mask value is treated as a signed integer, so that mask values with the high bit set will not be
66 // clamped when returned as signed integers.
CastMaskValue(const Context * context,GLuint value)67 GLint CastMaskValue(const Context *context, GLuint value)
68 {
69     return (context->getClientVersion() >= Version(3, 1) ? static_cast<GLint>(value)
70                                                          : clampCast<GLint>(value));
71 }
72 
73 template <typename QueryT, typename InternalT>
74 QueryT CastFromGLintStateValue(GLenum pname, InternalT value)
75 {
76     return CastFromStateValue<QueryT, GLint>(pname, clampCast<GLint, InternalT>(value));
77 }
78 
79 template GLfloat CastFromGLintStateValue<GLfloat, GLenum>(GLenum pname, GLenum value);
80 template GLint CastFromGLintStateValue<GLint, GLenum>(GLenum pname, GLenum value);
81 template GLint64 CastFromGLintStateValue<GLint64, GLenum>(GLenum pname, GLenum value);
82 template GLuint CastFromGLintStateValue<GLuint, GLenum>(GLenum pname, GLenum value);
83 template GLfloat CastFromGLintStateValue<GLfloat, bool>(GLenum pname, bool value);
84 template GLuint CastFromGLintStateValue<GLuint, bool>(GLenum pname, bool value);
85 template GLint CastFromGLintStateValue<GLint, bool>(GLenum pname, bool value);
86 
87 template <typename QueryT, typename NativeT>
88 QueryT CastFromStateValue(GLenum pname, NativeT value)
89 {
90     GLenum queryType = GLTypeToGLenum<QueryT>::value;
91 
92     switch (queryType)
93     {
94         case GL_INT:
95         case GL_INT_64_ANGLEX:
96         case GL_UNSIGNED_INT:
97         case GL_UINT_64_ANGLEX:
98             return CastFromStateValueToInt<QueryT, NativeT>(pname, value);
99         case GL_FLOAT:
100             return static_cast<QueryT>(value);
101         case GL_BOOL:
102             return static_cast<QueryT>(value == static_cast<NativeT>(0) ? GL_FALSE : GL_TRUE);
103         default:
104             UNREACHABLE();
105             return 0;
106     }
107 }
108 template GLint CastFromStateValue<GLint, GLint>(GLenum pname, GLint value);
109 template GLint CastFromStateValue<GLint, GLint64>(GLenum pname, GLint64 value);
110 template GLint64 CastFromStateValue<GLint64, GLint>(GLenum pname, GLint value);
111 template GLint64 CastFromStateValue<GLint64, GLint64>(GLenum pname, GLint64 value);
112 template GLfloat CastFromStateValue<GLfloat, GLint>(GLenum pname, GLint value);
113 template GLfloat CastFromStateValue<GLfloat, GLfloat>(GLenum pname, GLfloat value);
114 template GLint CastFromStateValue<GLint, GLfloat>(GLenum pname, GLfloat value);
115 template GLuint CastFromStateValue<GLuint, GLint>(GLenum pname, GLint value);
116 template GLuint CastFromStateValue<GLuint, GLuint>(GLenum pname, GLuint value);
117 template GLint CastFromStateValue<GLint, GLboolean>(GLenum pname, GLboolean value);
118 template GLint64 CastFromStateValue<GLint64, GLboolean>(GLenum pname, GLboolean value);
119 template GLint CastFromStateValue<GLint, GLuint>(GLenum pname, GLuint value);
120 template GLint64 CastFromStateValue<GLint64, GLuint>(GLenum pname, GLuint value);
121 template GLuint64 CastFromStateValue<GLuint64, GLuint>(GLenum pname, GLuint value);
122 
123 template <typename NativeT, typename QueryT>
124 NativeT CastQueryValueTo(GLenum pname, QueryT value)
125 {
126     GLenum nativeType = GLTypeToGLenum<NativeT>::value;
127 
128     switch (nativeType)
129     {
130         case GL_INT:
131         case GL_INT_64_ANGLEX:
132         case GL_UNSIGNED_INT:
133         case GL_UINT_64_ANGLEX:
134             return CastQueryValueToInt<NativeT, QueryT>(pname, value);
135         case GL_FLOAT:
136             return static_cast<NativeT>(value);
137         case GL_BOOL:
138             return static_cast<NativeT>(value == static_cast<QueryT>(0) ? GL_FALSE : GL_TRUE);
139         default:
140             UNREACHABLE();
141             return 0;
142     }
143 }
144 
145 template GLint CastQueryValueTo<GLint, GLfloat>(GLenum pname, GLfloat value);
146 template GLboolean CastQueryValueTo<GLboolean, GLint>(GLenum pname, GLint value);
147 template GLint CastQueryValueTo<GLint, GLint>(GLenum pname, GLint value);
148 template GLfloat CastQueryValueTo<GLfloat, GLint>(GLenum pname, GLint value);
149 template GLfloat CastQueryValueTo<GLfloat, GLfloat>(GLenum pname, GLfloat value);
150 template GLuint CastQueryValueTo<GLuint, GLint>(GLenum pname, GLint value);
151 template GLuint CastQueryValueTo<GLuint, GLfloat>(GLenum pname, GLfloat value);
152 
153 template <typename QueryT>
CastStateValues(Context * context,GLenum nativeType,GLenum pname,unsigned int numParams,QueryT * outParams)154 void CastStateValues(Context *context, GLenum nativeType, GLenum pname,
155                      unsigned int numParams, QueryT *outParams)
156 {
157     if (nativeType == GL_INT)
158     {
159         std::vector<GLint> intParams(numParams, 0);
160         context->getIntegervImpl(pname, intParams.data());
161 
162         for (unsigned int i = 0; i < numParams; ++i)
163         {
164             outParams[i] = CastFromStateValue<QueryT>(pname, intParams[i]);
165         }
166     }
167     else if (nativeType == GL_BOOL)
168     {
169         std::vector<GLboolean> boolParams(numParams, GL_FALSE);
170         context->getBooleanvImpl(pname, boolParams.data());
171 
172         for (unsigned int i = 0; i < numParams; ++i)
173         {
174             outParams[i] = (boolParams[i] == GL_FALSE ? static_cast<QueryT>(0) : static_cast<QueryT>(1));
175         }
176     }
177     else if (nativeType == GL_FLOAT)
178     {
179         std::vector<GLfloat> floatParams(numParams, 0.0f);
180         context->getFloatvImpl(pname, floatParams.data());
181 
182         for (unsigned int i = 0; i < numParams; ++i)
183         {
184             outParams[i] = CastFromStateValue<QueryT>(pname, floatParams[i]);
185         }
186     }
187     else if (nativeType == GL_INT_64_ANGLEX)
188     {
189         std::vector<GLint64> int64Params(numParams, 0);
190         context->getInteger64v(pname, int64Params.data());
191 
192         for (unsigned int i = 0; i < numParams; ++i)
193         {
194             outParams[i] = CastFromStateValue<QueryT>(pname, int64Params[i]);
195         }
196     }
197     else UNREACHABLE();
198 }
199 
200 // Explicit template instantiation (how we export template functions in different files)
201 // The calls below will make CastStateValues successfully link with the GL state query types
202 // The GL state query API types are: bool, int, uint, float, int64, uint64
203 
204 template void CastStateValues<GLboolean>(Context *, GLenum, GLenum, unsigned int, GLboolean *);
205 template void CastStateValues<GLint>(Context *, GLenum, GLenum, unsigned int, GLint *);
206 template void CastStateValues<GLuint>(Context *, GLenum, GLenum, unsigned int, GLuint *);
207 template void CastStateValues<GLfloat>(Context *, GLenum, GLenum, unsigned int, GLfloat *);
208 template void CastStateValues<GLint64>(Context *, GLenum, GLenum, unsigned int, GLint64 *);
209 
210 template <typename QueryT>
CastIndexedStateValues(Context * context,GLenum nativeType,GLenum pname,GLuint index,unsigned int numParams,QueryT * outParams)211 void CastIndexedStateValues(Context *context,
212                             GLenum nativeType,
213                             GLenum pname,
214                             GLuint index,
215                             unsigned int numParams,
216                             QueryT *outParams)
217 {
218     if (nativeType == GL_INT)
219     {
220         std::vector<GLint> intParams(numParams, 0);
221         context->getIntegeri_v(pname, index, intParams.data());
222 
223         for (unsigned int i = 0; i < numParams; ++i)
224         {
225             outParams[i] = CastFromStateValue<QueryT>(pname, intParams[i]);
226         }
227     }
228     else if (nativeType == GL_BOOL)
229     {
230         std::vector<GLboolean> boolParams(numParams, GL_FALSE);
231         context->getBooleani_v(pname, index, boolParams.data());
232 
233         for (unsigned int i = 0; i < numParams; ++i)
234         {
235             outParams[i] =
236                 (boolParams[i] == GL_FALSE ? static_cast<QueryT>(0) : static_cast<QueryT>(1));
237         }
238     }
239     else if (nativeType == GL_INT_64_ANGLEX)
240     {
241         std::vector<GLint64> int64Params(numParams, 0);
242         context->getInteger64i_v(pname, index, int64Params.data());
243 
244         for (unsigned int i = 0; i < numParams; ++i)
245         {
246             outParams[i] = CastFromStateValue<QueryT>(pname, int64Params[i]);
247         }
248     }
249     else
250         UNREACHABLE();
251 }
252 
253 template void CastIndexedStateValues<GLboolean>(Context *,
254                                                 GLenum,
255                                                 GLenum,
256                                                 GLuint index,
257                                                 unsigned int,
258                                                 GLboolean *);
259 template void CastIndexedStateValues<GLint>(Context *,
260                                             GLenum,
261                                             GLenum,
262                                             GLuint index,
263                                             unsigned int,
264                                             GLint *);
265 template void CastIndexedStateValues<GLuint>(Context *,
266                                              GLenum,
267                                              GLenum,
268                                              GLuint index,
269                                              unsigned int,
270                                              GLuint *);
271 template void CastIndexedStateValues<GLfloat>(Context *,
272                                               GLenum,
273                                               GLenum,
274                                               GLuint index,
275                                               unsigned int,
276                                               GLfloat *);
277 template void CastIndexedStateValues<GLint64>(Context *,
278                                               GLenum,
279                                               GLenum,
280                                               GLuint index,
281                                               unsigned int,
282                                               GLint64 *);
283 }
284