Flutter Linux Embedder
fl_backing_store_provider.cc File Reference
#include "fl_backing_store_provider.h"
#include <epoxy/gl.h>

Go to the source code of this file.

Classes

struct  _FlBackingStoreProvider
 

Functions

static void fl_backing_store_provider_dispose (GObject *object)
 
static void fl_backing_store_provider_class_init (FlBackingStoreProviderClass *klass)
 
static void fl_backing_store_provider_init (FlBackingStoreProvider *self)
 
FlBackingStoreProvider * fl_backing_store_provider_new (int width, int height)
 
uint32_t fl_backing_store_provider_get_gl_framebuffer_id (FlBackingStoreProvider *self)
 
uint32_t fl_backing_store_provider_get_gl_texture_id (FlBackingStoreProvider *self)
 
uint32_t fl_backing_store_provider_get_gl_target (FlBackingStoreProvider *self)
 
uint32_t fl_backing_store_provider_get_gl_format (FlBackingStoreProvider *self)
 
GdkRectangle fl_backing_store_provider_get_geometry (FlBackingStoreProvider *self)
 

Function Documentation

◆ fl_backing_store_provider_class_init()

static void fl_backing_store_provider_class_init ( FlBackingStoreProviderClass *  klass)
static

Definition at line 28 of file fl_backing_store_provider.cc.

29  {
30  G_OBJECT_CLASS(klass)->dispose = fl_backing_store_provider_dispose;
31 }

References fl_backing_store_provider_dispose().

◆ fl_backing_store_provider_dispose()

static void fl_backing_store_provider_dispose ( GObject *  object)
static

Definition at line 19 of file fl_backing_store_provider.cc.

19  {
20  FlBackingStoreProvider* self = FL_BACKING_STORE_PROVIDER(object);
21 
22  glDeleteFramebuffers(1, &self->framebuffer_id);
23  glDeleteTextures(1, &self->texture_id);
24 
25  G_OBJECT_CLASS(fl_backing_store_provider_parent_class)->dispose(object);
26 }

Referenced by fl_backing_store_provider_class_init().

◆ fl_backing_store_provider_get_geometry()

GdkRectangle fl_backing_store_provider_get_geometry ( FlBackingStoreProvider *  provider)

fl_backing_store_provider_get_geometry: @provider: an #FlBackingStoreProvider.

Gets geometry of framebuffer.

Returns: geometry of backing store.

Definition at line 105 of file fl_backing_store_provider.cc.

106  {
107  return self->geometry;
108 }

Referenced by fl_renderer_render().

◆ fl_backing_store_provider_get_gl_format()

uint32_t fl_backing_store_provider_get_gl_format ( FlBackingStoreProvider *  provider)

fl_backing_store_provider_get_gl_format: @provider: an #FlBackingStoreProvider.

Gets texture format (example GL_RGBA8).

Returns: texture format.

Definition at line 80 of file fl_backing_store_provider.cc.

80  {
81  // Flutter defines SK_R32_SHIFT=16, so SK_PMCOLOR_BYTE_ORDER should be BGRA.
82  // In Linux kN32_SkColorType is assumed to be kBGRA_8888_SkColorType.
83  // So we must choose a valid gl format to be compatible with surface format
84  // BGRA8.
85  // Following logic is copied from Skia GrGLCaps.cpp:
86  // https://github.com/google/skia/blob/4738ed711e03212aceec3cd502a4adb545f38e63/src/gpu/ganesh/gl/GrGLCaps.cpp#L1963-L2116
87 
88  if (epoxy_is_desktop_gl()) {
89  // For OpenGL.
90  if (epoxy_gl_version() >= 12 || epoxy_has_gl_extension("GL_EXT_bgra")) {
91  return GL_RGBA8;
92  }
93  } else {
94  // For OpenGL ES.
95  if (epoxy_has_gl_extension("GL_EXT_texture_format_BGRA8888") ||
96  (epoxy_has_gl_extension("GL_APPLE_texture_format_BGRA8888") &&
97  epoxy_gl_version() >= 30)) {
98  return GL_BGRA8_EXT;
99  }
100  }
101  g_critical("Failed to determine valid GL format for Flutter rendering");
102  return GL_RGBA8;
103 }

Referenced by fl_renderer_create_backing_store().

◆ fl_backing_store_provider_get_gl_framebuffer_id()

uint32_t fl_backing_store_provider_get_gl_framebuffer_id ( FlBackingStoreProvider *  provider)

fl_backing_store_provider_get_gl_framebuffer_id: @provider: an #FlBackingStoreProvider.

Gets created framebuffer id.

Returns: gl framebuffer id, 0 if creation failed.

Definition at line 66 of file fl_backing_store_provider.cc.

67  {
68  return self->framebuffer_id;
69 }

Referenced by fl_renderer_create_backing_store().

◆ fl_backing_store_provider_get_gl_target()

uint32_t fl_backing_store_provider_get_gl_target ( FlBackingStoreProvider *  provider)

fl_backing_store_provider_get_gl_target: @provider: an #FlBackingStoreProvider.

Gets target texture (example GL_TEXTURE_2D or GL_TEXTURE_RECTANGLE).

Returns: target texture.

Definition at line 76 of file fl_backing_store_provider.cc.

76  {
77  return GL_TEXTURE_2D;
78 }

◆ fl_backing_store_provider_get_gl_texture_id()

uint32_t fl_backing_store_provider_get_gl_texture_id ( FlBackingStoreProvider *  provider)

fl_backing_store_provider_get_gl_texture_id: @provider: an #FlBackingStoreProvider.

Gets created texture id.

Returns: gl texture id, 0 if creation failed.

Definition at line 71 of file fl_backing_store_provider.cc.

72  {
73  return self->texture_id;
74 }

Referenced by fl_renderer_render().

◆ fl_backing_store_provider_init()

static void fl_backing_store_provider_init ( FlBackingStoreProvider *  self)
static

Definition at line 33 of file fl_backing_store_provider.cc.

33 {}

◆ fl_backing_store_provider_new()

FlBackingStoreProvider* fl_backing_store_provider_new ( int  width,
int  height 
)

Definition at line 35 of file fl_backing_store_provider.cc.

35  {
36  FlBackingStoreProvider* provider = FL_BACKING_STORE_PROVIDER(
37  g_object_new(fl_backing_store_provider_get_type(), nullptr));
38 
39  provider->geometry = {
40  .x = 0,
41  .y = 0,
42  .width = width,
43  .height = height,
44  };
45 
46  glGenTextures(1, &provider->texture_id);
47  glGenFramebuffers(1, &provider->framebuffer_id);
48 
49  glBindFramebuffer(GL_FRAMEBUFFER, provider->framebuffer_id);
50 
51  glBindTexture(GL_TEXTURE_2D, provider->texture_id);
52  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
53  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
54  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
55  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
56  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA,
57  GL_UNSIGNED_BYTE, NULL);
58  glBindTexture(GL_TEXTURE_2D, 0);
59 
60  glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
61  GL_TEXTURE_2D, provider->texture_id, 0);
62 
63  return provider;
64 }

References height, and width.

Referenced by fl_renderer_create_backing_store(), and TEST().

height
G_BEGIN_DECLS int height
Definition: fl_backing_store_provider.h:37
fl_backing_store_provider_dispose
static void fl_backing_store_provider_dispose(GObject *object)
Definition: fl_backing_store_provider.cc:19
width
const uint8_t uint32_t * width
Definition: fl_pixel_buffer_texture_test.cc:38