Flutter Impeller
formats_gles.cc
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1 // Copyright 2013 The Flutter 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 #include "impeller/renderer/backend/gles/formats_gles.h"
6 
7 namespace impeller {
8 
9 std::string DebugToFramebufferError(int status) {
10  switch (status) {
11  case GL_FRAMEBUFFER_UNDEFINED:
12  return "GL_FRAMEBUFFER_UNDEFINED";
13  case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
14  return "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT";
15  case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
16  return "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT";
17  case GL_FRAMEBUFFER_UNSUPPORTED:
18  return "GL_FRAMEBUFFER_UNSUPPORTED";
19  case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE:
20  return "GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE";
21  default:
22  return "Unknown error code: " + std::to_string(status);
23  }
24 }
25 
26 std::optional<PixelFormatGLES> ToPixelFormatGLES(PixelFormat pixel_format,
27  bool supports_bgra) {
28  PixelFormatGLES format;
29 
30  switch (pixel_format) {
31  case PixelFormat::kA8UNormInt:
32  format.internal_format = GL_ALPHA;
33  format.external_format = GL_ALPHA;
34  format.type = GL_UNSIGNED_BYTE;
35  break;
36  case PixelFormat::kR8UNormInt:
37  format.internal_format = GL_RED;
38  format.external_format = GL_RED;
39  format.type = GL_UNSIGNED_BYTE;
40  break;
41  case PixelFormat::kR8G8B8A8UNormInt:
42  case PixelFormat::kR8G8B8A8UNormIntSRGB:
43  format.internal_format = GL_RGBA;
44  format.external_format = GL_RGBA;
45  format.type = GL_UNSIGNED_BYTE;
46  break;
47  case PixelFormat::kB8G8R8A8UNormInt:
48  case PixelFormat::kB8G8R8A8UNormIntSRGB:
49  if (supports_bgra) {
50  format.internal_format = GL_BGRA_EXT;
51  format.external_format = GL_BGRA_EXT;
52  } else {
53  format.internal_format = GL_RGBA;
54  format.external_format = GL_RGBA;
55  }
56  format.type = GL_UNSIGNED_BYTE;
57  break;
58  case PixelFormat::kR32G32B32A32Float:
59  format.internal_format = GL_RGBA32F;
60  format.external_format = GL_RGBA;
61  format.type = GL_FLOAT;
62  break;
63  case PixelFormat::kR32Float:
64  format.internal_format = GL_R32F;
65  format.external_format = GL_RED;
66  format.type = GL_FLOAT;
67  break;
68  case PixelFormat::kR16G16B16A16Float:
69  format.internal_format = GL_RGBA16F;
70  format.external_format = GL_RGBA;
71  format.type = GL_HALF_FLOAT;
72  break;
73  case PixelFormat::kS8UInt:
74  // Pure stencil textures are only available in OpenGL 4.4+, which is
75  // ~0% of mobile devices. Instead, we use a depth-stencil texture and
76  // only use the stencil component.
77  //
78  // https://registry.khronos.org/OpenGL-Refpages/gl4/html/glTexImage2D.xhtml
79  case PixelFormat::kD24UnormS8Uint:
80  format.internal_format = GL_DEPTH_STENCIL;
81  format.external_format = GL_DEPTH_STENCIL;
82  format.type = GL_UNSIGNED_INT_24_8;
83  break;
84  case PixelFormat::kUnknown:
85  case PixelFormat::kD32FloatS8UInt:
86  case PixelFormat::kR8G8UNormInt:
87  case PixelFormat::kB10G10R10XRSRGB:
88  case PixelFormat::kB10G10R10XR:
89  case PixelFormat::kB10G10R10A10XR:
90  return std::nullopt;
91  }
92  return format;
93 }
94 
95 } // namespace impeller
formats_gles.h
impeller::ToPixelFormatGLES
std::optional< PixelFormatGLES > ToPixelFormatGLES(PixelFormat pixel_format, bool supports_bgra)
Definition: formats_gles.cc:26
impeller::DebugToFramebufferError
std::string DebugToFramebufferError(int status)
Definition: formats_gles.cc:9
impeller::PixelFormat
PixelFormat
The Pixel formats supported by Impeller. The naming convention denotes the usage of the component,...
Definition: formats.h:99