capabilities_gles.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CAPABILITIES_GLES_H_
#define FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CAPABILITIES_GLES_H_
 
#include <cstddef>
 
#include "impeller/base/backend_cast.h"
#include "impeller/core/formats.h"
#include "impeller/core/shader_types.h"
#include "impeller/geometry/size.h"
#include "impeller/renderer/capabilities.h"
 
namespace impeller {
 
class ProcTableGLES;
 
//------------------------------------------------------------------------------
/// @brief      The Vulkan layers and extensions wrangler.
///
class CapabilitiesGLES final
    : public Capabilities,
      public BackendCast<CapabilitiesGLES, Capabilities> {
 public:
  explicit CapabilitiesGLES(const ProcTableGLES& gl);
 
  CapabilitiesGLES(const CapabilitiesGLES&) = delete;
 
  CapabilitiesGLES(CapabilitiesGLES&&) = delete;
 
  CapabilitiesGLES& operator=(const CapabilitiesGLES&) = delete;
 
  CapabilitiesGLES& operator=(CapabilitiesGLES&&) = delete;
 
  // Must be at least 8.
  size_t max_combined_texture_image_units = 8;
 
  // Must be at least 16.
  size_t max_cube_map_texture_size = 16;
 
  // Must be at least 16.
  size_t max_fragment_uniform_vectors = 16;
 
  // Must be at least 1.
  size_t max_renderbuffer_size = 1;
 
  // Must be at least 8.
  size_t max_texture_image_units = 8;
 
  // Must be at least 64.
  ISize max_texture_size = ISize{64, 64};
 
  // Must be at least 8.
  size_t max_varying_vectors = 8;
 
  // Must be at least 8.
  size_t max_vertex_attribs = 8;
 
  // May be 0.
  size_t max_vertex_texture_image_units = 0;
 
  // Must be at least 128.
  size_t max_vertex_uniform_vectors = 128;
 
  // Must be at least display size.
  ISize max_viewport_dims;
 
  // May be 0.
  size_t num_compressed_texture_formats = 0;
 
  // May be 0.
  size_t num_shader_binary_formats = 0;
 
  size_t GetMaxTextureUnits(ShaderStage stage) const;
 
  bool IsANGLE() const;
 
  /// @brief Whether this is an ES GL variant or (if false) desktop GL.
  bool IsES() const;
 
  // |Capabilities|
  /// Always false. Rendering into a non-zero mip level is not yet implemented
  /// on the GLES backend; see SupportsFramebufferRenderMipmap in the .cc file.
  bool SupportsFramebufferRenderMipmap() const override;
 
  /// @brief Whether GL_TEXTURE_MAX_LEVEL can be set to bound a texture's
  /// sampled
  ///        mip range. Core on desktop GL and ES 3.0+; on ES 2.0 it requires
  ///        the GL_APPLE_texture_max_level extension. Without it a partial mip
  ///        chain cannot be made mipmap complete and samples as black.
  bool SupportsTextureMaxLevel() const;
 
  // |Capabilities|
  bool SupportsOffscreenMSAA() const override;
 
  // |Capabilities|
  bool SupportsImplicitResolvingMSAA() const override;
 
  // |Capabilities|
  bool SupportsSSBO() const override;
 
  // |Capabilities|
  bool SupportsTextureToTextureBlits() const override;
 
  // |Capabilities|
  bool SupportsFramebufferFetch() const override;
 
  // |Capabilities|
  bool SupportsCompute() const override;
 
  // |Capabilities|
  bool SupportsComputeSubgroups() const override;
 
  // |Capabilities|
  bool SupportsReadFromResolve() const override;
 
  // |Capabilities|
  bool SupportsDecalSamplerAddressMode() const override;
 
  // |Capabilities|
  bool SupportsDeviceTransientTextures() const override;
 
  // |Capabilities|
  bool SupportsTriangleFan() const override;
 
  // |Capabilities|
  bool SupportsPrimitiveRestart() const override;
 
  // |Capabilities|
  bool Supports32BitPrimitiveIndices() const override;
 
  // |Capabilities|
  bool SupportsManuallyMippedTextures() const override;
 
  // |Capabilities|
  bool SupportsExtendedRangeFormats() const override;
 
  // |Capabilities|
  bool SupportsTextureCompression(
      CompressedTextureFamily family) const override;
 
  // |Capabilities|
  PixelFormat GetDefaultColorFormat() const override;
 
  // |Capabilities|
  PixelFormat GetDefaultStencilFormat() const override;
 
  // |Capabilities|
  PixelFormat GetDefaultDepthStencilFormat() const override;
 
  // |Capabilities|
  PixelFormat GetDefaultGlyphAtlasFormat() const override;
 
  // |Capabilities|
  ISize GetMaximumRenderPassAttachmentSize() const override;
 
  // |Capabilities|
  uint32_t GetMaxSamplerAnisotropy() const override;
 
  // |Capabilities|
  size_t GetMinimumUniformAlignment() const override;
 
  // |Capabilities|
  bool NeedsPartitionedHostBuffer() const override;
 
 private:
  bool supports_texture_to_texture_blits_ = false;
  bool supports_framebuffer_fetch_ = false;
  bool supports_decal_sampler_address_mode_ = false;
  bool supports_offscreen_msaa_ = false;
  bool supports_implicit_msaa_ = false;
  bool supports_32bit_primitive_indices_ = false;
  bool supports_texture_max_level_ = false;
  bool is_angle_ = false;
  bool is_es_ = false;
  bool supports_texture_compression_bc_ = false;
  bool supports_texture_compression_etc2_ = false;
  bool supports_texture_compression_astc_ = false;
  bool supports_texture_compression_astc_hdr_ = false;
  uint32_t max_sampler_anisotropy_ = 1;
  PixelFormat default_glyph_atlas_format_ = PixelFormat::kUnknown;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_GLES_CAPABILITIES_GLES_H_