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1 // Copyright 2019 The ANGLE Project Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 //
5 // format_map_desktop:
6 //   Determining the sized internal format from a (format,type) pair.
7 //   Also check DesktopGL format combinations for validity.
8 
9 #include "angle_gl.h"
10 #include "common/debug.h"
11 #include "formatutils.h"
12 #include "renderer/gl/functionsgl_enums.h"
13 
14 // TODO(http://anglebug.com/3730): switch ANGLE to generate its own GL enum types from gl.xml
15 
16 namespace gl
17 {
18 
ValidDesktopFormat(GLenum format)19 bool ValidDesktopFormat(GLenum format)
20 {
21     switch (format)
22     {
23         case GL_STENCIL_INDEX:
24         case GL_DEPTH_COMPONENT:
25         case GL_DEPTH_STENCIL:
26         case GL_RED:
27         case GL_GREEN:
28         case GL_BLUE:
29         case GL_RG:
30         case GL_RGB:
31         case GL_RGBA:
32         case GL_BGR:
33         case GL_BGRA:
34         case GL_RED_INTEGER:
35         case GL_GREEN_INTEGER:
36         case GL_BLUE_INTEGER:
37         case GL_RG_INTEGER:
38         case GL_RGB_INTEGER:
39         case GL_RGBA_INTEGER:
40         case GL_BGR_INTEGER:
41         case GL_BGRA_INTEGER:
42             return true;
43 
44         default:
45             return false;
46     }
47 }
48 
ValidDesktopType(GLenum type)49 bool ValidDesktopType(GLenum type)
50 {
51     switch (type)
52     {
53         case GL_UNSIGNED_BYTE:
54         case GL_BYTE:
55         case GL_UNSIGNED_SHORT:
56         case GL_SHORT:
57         case GL_UNSIGNED_INT:
58         case GL_INT:
59         case GL_HALF_FLOAT:
60         case GL_FLOAT:
61         case GL_UNSIGNED_BYTE_3_3_2:
62         case GL_UNSIGNED_BYTE_2_3_3_REV:
63         case GL_UNSIGNED_SHORT_5_6_5:
64         case GL_UNSIGNED_SHORT_5_6_5_REV:
65         case GL_UNSIGNED_SHORT_4_4_4_4:
66         case GL_UNSIGNED_SHORT_4_4_4_4_REV:
67         case GL_UNSIGNED_SHORT_5_5_5_1:
68         case GL_UNSIGNED_SHORT_1_5_5_5_REV:
69         case GL_UNSIGNED_INT_10_10_10_2:
70         case GL_UNSIGNED_INT_2_10_10_10_REV:
71         case GL_UNSIGNED_INT_24_8:
72         case GL_UNSIGNED_INT_10F_11F_11F_REV:
73         case GL_UNSIGNED_INT_5_9_9_9_REV:
74         case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
75             return true;
76 
77         default:
78             return false;
79     }
80 }
81 
82 // From OpenGL 4.6 spec section 8.4
ValidDesktopFormatCombination(GLenum format,GLenum type,GLenum internalFormat)83 bool ValidDesktopFormatCombination(GLenum format, GLenum type, GLenum internalFormat)
84 {
85     ASSERT(ValidDesktopFormat(format) && ValidDesktopType(type));
86     const InternalFormat &internalFormatInfo = GetInternalFormatInfo(internalFormat, type);
87     const InternalFormat &formatInfo         = GetInternalFormatInfo(format, type);
88 
89     switch (format)
90     {
91         case GL_RED_INTEGER:
92         case GL_GREEN_INTEGER:
93         case GL_BLUE_INTEGER:
94         case GL_RG_INTEGER:
95         case GL_RGB_INTEGER:
96         case GL_RGBA_INTEGER:
97         case GL_BGR_INTEGER:
98         case GL_BGRA_INTEGER:
99             switch (type)
100             {
101                 case GL_HALF_FLOAT:
102                 case GL_FLOAT:
103                 case GL_UNSIGNED_INT_10F_11F_11F_REV:
104                 case GL_UNSIGNED_INT_5_9_9_9_REV:
105                     return false;
106                 default:
107                     break;
108             }
109             if (!internalFormatInfo.isInt())
110                 return false;
111             break;
112         default:
113             // format is not an integer
114             if (internalFormatInfo.isInt())
115                 return false;
116 
117             if (formatInfo.isDepthOrStencil() != internalFormatInfo.isDepthOrStencil())
118                 return false;
119 
120             if (format == GL_STENCIL_INDEX && internalFormat != GL_STENCIL_INDEX)
121                 return false;
122             break;
123     }
124 
125     return true;
126 }
127 
128 }  // namespace gl
129