Flutter Impeller
capabilities_gles.h
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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 #ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CAPABILITIES_GLES_H_
6 #define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CAPABILITIES_GLES_H_
7 
8 #include <cstddef>
9 
11 #include "impeller/core/formats.h"
13 #include "impeller/geometry/size.h"
15 
16 namespace impeller {
17 
18 class ProcTableGLES;
19 
20 //------------------------------------------------------------------------------
21 /// @brief The Vulkan layers and extensions wrangler.
22 ///
23 class CapabilitiesGLES final
24  : public Capabilities,
25  public BackendCast<CapabilitiesGLES, Capabilities> {
26  public:
27  explicit CapabilitiesGLES(const ProcTableGLES& gl);
28 
30 
32 
34 
36 
37  // Must be at least 8.
39 
40  // Must be at least 16.
42 
43  // Must be at least 16.
45 
46  // Must be at least 1.
48 
49  // Must be at least 8.
51 
52  // Must be at least 64.
54 
55  // Must be at least 8.
56  size_t max_varying_vectors = 8;
57 
58  // Must be at least 8.
59  size_t max_vertex_attribs = 8;
60 
61  // May be 0.
63 
64  // Must be at least 128.
66 
67  // Must be at least display size.
69 
70  // May be 0.
72 
73  // May be 0.
75 
76  size_t GetMaxTextureUnits(ShaderStage stage) const;
77 
78  bool IsANGLE() const;
79 
80  /// @brief Whether this is an ES GL variant or (if false) desktop GL.
81  bool IsES() const;
82 
83  // |Capabilities|
84  bool SupportsOffscreenMSAA() const override;
85 
86  // |Capabilities|
87  bool SupportsImplicitResolvingMSAA() const override;
88 
89  // |Capabilities|
90  bool SupportsSSBO() const override;
91 
92  // |Capabilities|
93  bool SupportsTextureToTextureBlits() const override;
94 
95  // |Capabilities|
96  bool SupportsFramebufferFetch() const override;
97 
98  // |Capabilities|
99  bool SupportsCompute() const override;
100 
101  // |Capabilities|
102  bool SupportsComputeSubgroups() const override;
103 
104  // |Capabilities|
105  bool SupportsReadFromResolve() const override;
106 
107  // |Capabilities|
108  bool SupportsDecalSamplerAddressMode() const override;
109 
110  // |Capabilities|
111  bool SupportsDeviceTransientTextures() const override;
112 
113  // |Capabilities|
114  bool SupportsTriangleFan() const override;
115 
116  // |Capabilities|
117  bool SupportsPrimitiveRestart() const override;
118 
119  // |Capabilities|
120  bool SupportsExtendedRangeFormats() const override;
121 
122  // |Capabilities|
123  PixelFormat GetDefaultColorFormat() const override;
124 
125  // |Capabilities|
126  PixelFormat GetDefaultStencilFormat() const override;
127 
128  // |Capabilities|
129  PixelFormat GetDefaultDepthStencilFormat() const override;
130 
131  // |Capabilities|
132  PixelFormat GetDefaultGlyphAtlasFormat() const override;
133 
134  // |Capabilities|
135  ISize GetMaximumRenderPassAttachmentSize() const override;
136 
137  // |Capabilities|
138  size_t GetMinimumUniformAlignment() const override;
139 
140  private:
141  bool supports_texture_to_texture_blits_ = false;
142  bool supports_framebuffer_fetch_ = false;
143  bool supports_decal_sampler_address_mode_ = false;
144  bool supports_offscreen_msaa_ = false;
145  bool supports_implicit_msaa_ = false;
146  bool is_angle_ = false;
147  bool is_es_ = false;
148  PixelFormat default_glyph_atlas_format_ = PixelFormat::kUnknown;
149 };
150 
151 } // namespace impeller
152 
153 #endif // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CAPABILITIES_GLES_H_
The Vulkan layers and extensions wrangler.
bool IsES() const
Whether this is an ES GL variant or (if false) desktop GL.
bool SupportsImplicitResolvingMSAA() const override
Whether the context backend supports multisampled rendering to the on-screen surface without requirin...
PixelFormat GetDefaultDepthStencilFormat() const override
Returns a supported PixelFormat for textures that store both a stencil and depth component....
CapabilitiesGLES & operator=(const CapabilitiesGLES &)=delete
PixelFormat GetDefaultColorFormat() const override
Returns a supported PixelFormat for textures that store 4-channel colors (red/green/blue/alpha).
bool SupportsSSBO() const override
Whether the context backend supports binding Shader Storage Buffer Objects (SSBOs) to pipelines.
bool SupportsTextureToTextureBlits() const override
Whether the context backend supports blitting from one texture region to another texture region (via ...
ISize GetMaximumRenderPassAttachmentSize() const override
Return the maximum size of a render pass attachment.
CapabilitiesGLES(const CapabilitiesGLES &)=delete
CapabilitiesGLES(const ProcTableGLES &gl)
bool SupportsPrimitiveRestart() const override
Whether primitive restart is supported.
size_t GetMaxTextureUnits(ShaderStage stage) const
bool SupportsTriangleFan() const override
Whether the primitive type TriangleFan is supported by the backend.
CapabilitiesGLES(CapabilitiesGLES &&)=delete
bool SupportsOffscreenMSAA() const override
Whether the context backend supports attaching offscreen MSAA color/stencil textures.
size_t GetMinimumUniformAlignment() const override
The minimum alignment of uniform value offsets in bytes.
PixelFormat GetDefaultStencilFormat() const override
Returns a supported PixelFormat for textures that store stencil information. May include a depth chan...
bool SupportsReadFromResolve() const override
Whether the context backend supports binding the current RenderPass attachments. This is supported if...
CapabilitiesGLES & operator=(CapabilitiesGLES &&)=delete
bool SupportsDeviceTransientTextures() const override
Whether the context backend supports allocating StorageMode::kDeviceTransient (aka "memoryless") text...
bool SupportsDecalSamplerAddressMode() const override
Whether the context backend supports SamplerAddressMode::Decal.
PixelFormat GetDefaultGlyphAtlasFormat() const override
Returns the default pixel format for the alpha bitmap glyph atlas.
bool SupportsExtendedRangeFormats() const override
Whether the XR formats are supported on this device.
bool SupportsCompute() const override
Whether the context backend supports ComputePass.
bool SupportsComputeSubgroups() const override
Whether the context backend supports configuring ComputePass command subgroups.
bool SupportsFramebufferFetch() const override
Whether the context backend is able to support pipelines with shaders that read from the framebuffer ...
PixelFormat
The Pixel formats supported by Impeller. The naming convention denotes the usage of the component,...
Definition: formats.h:99