1 //
2 // Copyright (c) 2013 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 // Contants.h: Defines some implementation specific and gl constants
8 
9 #ifndef LIBANGLE_CONSTANTS_H_
10 #define LIBANGLE_CONSTANTS_H_
11 
12 namespace gl
13 {
14 
15 enum
16 {
17     MAX_VERTEX_ATTRIBS = 16,
18 
19     // Implementation upper limits, real maximums depend on the hardware
20     IMPLEMENTATION_MAX_VARYING_VECTORS = 32,
21     IMPLEMENTATION_MAX_DRAW_BUFFERS = 8,
22     IMPLEMENTATION_MAX_FRAMEBUFFER_ATTACHMENTS = IMPLEMENTATION_MAX_DRAW_BUFFERS + 2, // 2 extra for depth and/or stencil buffers
23 
24     IMPLEMENTATION_MAX_VERTEX_SHADER_UNIFORM_BUFFERS = 16,
25     IMPLEMENTATION_MAX_FRAGMENT_SHADER_UNIFORM_BUFFERS = 16,
26     IMPLEMENTATION_MAX_COMBINED_SHADER_UNIFORM_BUFFERS = IMPLEMENTATION_MAX_VERTEX_SHADER_UNIFORM_BUFFERS +
27                                                          IMPLEMENTATION_MAX_FRAGMENT_SHADER_UNIFORM_BUFFERS,
28 
29     IMPLEMENTATION_MAX_TRANSFORM_FEEDBACK_BUFFERS = 4,
30 
31     // These are the maximums the implementation can support
32     // The actual GL caps are limited by the device caps
33     // and should be queried from the Context
34     IMPLEMENTATION_MAX_2D_TEXTURE_SIZE = 16384,
35     IMPLEMENTATION_MAX_CUBE_MAP_TEXTURE_SIZE = 16384,
36     IMPLEMENTATION_MAX_3D_TEXTURE_SIZE = 2048,
37     IMPLEMENTATION_MAX_2D_ARRAY_TEXTURE_LAYERS = 2048,
38 
39     IMPLEMENTATION_MAX_TEXTURE_LEVELS = 15   // 1+log2 of MAX_TEXTURE_SIZE
40 };
41 
42 }
43 
44 #endif // LIBANGLE_CONSTANTS_H_
45