| Flutter Impeller |

sampler_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/sampler_gles.h"
6
7 #include <iostream>
8
9 #include "impeller/base/validation.h"
10 #include "impeller/core/formats.h"
11 #include "impeller/renderer/backend/gles/formats_gles.h"
12 #include "impeller/renderer/backend/gles/proc_table_gles.h"
13 #include "impeller/renderer/backend/gles/texture_gles.h"
14
15 namespace impeller {
16
17 SamplerGLES::SamplerGLES(SamplerDescriptor desc) : Sampler(std::move(desc)) {}
18
19 SamplerGLES::~SamplerGLES() = default;
20
21 bool SamplerGLES::IsValid() const {
22 return true;
23 }
24
25 static GLint ToParam(MinMagFilter minmag_filter,
26 std::optional<MipFilter> mip_filter = std::nullopt) {
27 if (!mip_filter.has_value()) {
28 switch (minmag_filter) {
29 case MinMagFilter::kNearest:
30 return GL_NEAREST;
31 case MinMagFilter::kLinear:
32 return GL_LINEAR;
33 }
34 FML_UNREACHABLE();
35 }
36
37 switch (mip_filter.value()) {
38 case MipFilter::kNearest:
39 switch (minmag_filter) {
40 case MinMagFilter::kNearest:
41 return GL_NEAREST_MIPMAP_NEAREST;
42 case MinMagFilter::kLinear:
43 return GL_LINEAR_MIPMAP_NEAREST;
44 }
45 case MipFilter::kLinear:
46 switch (minmag_filter) {
47 case MinMagFilter::kNearest:
48 return GL_NEAREST_MIPMAP_LINEAR;
49 case MinMagFilter::kLinear:
50 return GL_LINEAR_MIPMAP_LINEAR;
51 }
52 }
53 FML_UNREACHABLE();
54 }
55
56 static GLint ToAddressMode(SamplerAddressMode mode) {
57 switch (mode) {
58 case SamplerAddressMode::kClampToEdge:
59 return GL_CLAMP_TO_EDGE;
60 case SamplerAddressMode::kRepeat:
61 return GL_REPEAT;
62 case SamplerAddressMode::kMirror:
63 return GL_MIRRORED_REPEAT;
64 case SamplerAddressMode::kDecal:
65 break; // Unsupported.
66 }
67 FML_UNREACHABLE();
68 }
69
70 bool SamplerGLES::ConfigureBoundTexture(const TextureGLES& texture,
71 const ProcTableGLES& gl) const {
72 if (!IsValid()) {
73 return false;
74 }
75
76 if (texture.NeedsMipmapGeneration()) {
77 VALIDATION_LOG
78 << "Texture mip count is > 1, but the mipmap has not been generated. "
79 "Texture can not be sampled safely.";
80 return false;
81 }
82
83 auto target = ToTextureTarget(texture.GetTextureDescriptor().type);
84
85 if (!target.has_value()) {
86 return false;
87 }
88 const auto& desc = GetDescriptor();
89
90 std::optional<MipFilter> mip_filter = std::nullopt;
91 if (texture.GetTextureDescriptor().mip_count > 1) {
92 mip_filter = desc.mip_filter;
93 }
94
95 gl.TexParameteri(target.value(), GL_TEXTURE_MIN_FILTER,
96 ToParam(desc.min_filter, mip_filter));
97 gl.TexParameteri(target.value(), GL_TEXTURE_MAG_FILTER,
98 ToParam(desc.mag_filter));
99 gl.TexParameteri(target.value(), GL_TEXTURE_WRAP_S,
100 ToAddressMode(desc.width_address_mode));
101 gl.TexParameteri(target.value(), GL_TEXTURE_WRAP_T,
102 ToAddressMode(desc.height_address_mode));
103 return true;
104 }
105
106 } // namespace impeller
impeller::Texture::NeedsMipmapGeneration
bool NeedsMipmapGeneration() const
Definition: texture.cc:85
impeller::SamplerAddressMode
SamplerAddressMode
Definition: formats.h:377
impeller::Texture::GetTextureDescriptor
const TextureDescriptor & GetTextureDescriptor() const
Definition: texture.cc:57
impeller::SamplerGLES::~SamplerGLES
~SamplerGLES()
formats.h
texture_gles.h
impeller::TextureDescriptor::mip_count
size_t mip_count
Definition: texture_descriptor.h:44
impeller::SamplerAddressMode::kClampToEdge
@ kClampToEdge
validation.h
sampler_gles.h
impeller::SamplerGLES::ConfigureBoundTexture
bool ConfigureBoundTexture(const TextureGLES &texture, const ProcTableGLES &gl) const
Definition: sampler_gles.cc:70
impeller::MinMagFilter::kNearest
@ kNearest
Select nearest to the sample point. Most widely supported.
impeller::TextureDescriptor::type
TextureType type
Definition: texture_descriptor.h:41
impeller::ToAddressMode
static GLint ToAddressMode(SamplerAddressMode mode)
Definition: sampler_gles.cc:56
impeller::MipFilter::kNearest
@ kNearest
Sample from the nearest mip level.
impeller::MinMagFilter::kLinear
@ kLinear
impeller::MinMagFilter
MinMagFilter
Definition: formats.h:361
impeller::ProcTableGLES
Definition: proc_table_gles.h:188
proc_table_gles.h
impeller::ToParam
static constexpr int ToParam(size_t index)
Definition: archive_statement.cc:75
formats_gles.h
VALIDATION_LOG
#define VALIDATION_LOG
Definition: validation.h:60
impeller::SamplerAddressMode::kMirror
@ kMirror
std
Definition: comparable.h:98
impeller::MipFilter::kLinear
@ kLinear
impeller::Sampler::GetDescriptor
const SamplerDescriptor & GetDescriptor() const
Definition: sampler.cc:13
impeller::ToTextureTarget
constexpr std::optional< GLenum > ToTextureTarget(TextureType type)
Definition: formats_gles.h:183
impeller::TextureGLES
Definition: texture_gles.h:15
impeller
Definition: aiks_context.cc:10
impeller::SamplerAddressMode::kRepeat
@ kRepeat
impeller::SamplerAddressMode::kDecal
@ kDecal
decal sampling mode is only supported on devices that pass the Capabilities.SupportsDecalSamplerAddre...