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.

                                        {
  G_OBJECT_CLASS(klass)->dispose = 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.

                                                               {
  FlBackingStoreProvider* self = FL_BACKING_STORE_PROVIDER(object);
 
  glDeleteFramebuffers(1, &self->framebuffer_id);
  glDeleteTextures(1, &self->texture_id);
 
  G_OBJECT_CLASS(fl_backing_store_provider_parent_class)->dispose(object);
}

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.

                                  {
  return self->geometry;
}

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.

                                                                               {
  // Flutter defines SK_R32_SHIFT=16, so SK_PMCOLOR_BYTE_ORDER should be BGRA.
  // In Linux kN32_SkColorType is assumed to be kBGRA_8888_SkColorType.
  // So we must choose a valid gl format to be compatible with surface format
  // BGRA8.
  // Following logic is copied from Skia GrGLCaps.cpp:
  // https://github.com/google/skia/blob/4738ed711e03212aceec3cd502a4adb545f38e63/src/gpu/ganesh/gl/GrGLCaps.cpp#L1963-L2116
 
  if (epoxy_is_desktop_gl()) {
    // For OpenGL.
    if (epoxy_gl_version() >= 12 || epoxy_has_gl_extension("GL_EXT_bgra")) {
      return GL_RGBA8;
    }
  } else {
    // For OpenGL ES.
    if (epoxy_has_gl_extension("GL_EXT_texture_format_BGRA8888") ||
        (epoxy_has_gl_extension("GL_APPLE_texture_format_BGRA8888") &&
         epoxy_gl_version() >= 30)) {
      return GL_BGRA8_EXT;
    }
  }
  g_critical("Failed to determine valid GL format for Flutter rendering");
  return GL_RGBA8;
}

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.

                                  {
  return self->framebuffer_id;
}

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.

                                                                               {
  return GL_TEXTURE_2D;
}

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.

                                  {
  return self->texture_id;
}

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.

{}

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.

                                                                             {
  FlBackingStoreProvider* provider = FL_BACKING_STORE_PROVIDER(
      g_object_new(fl_backing_store_provider_get_type(), nullptr));
 
  provider->geometry = {
      .x = 0,
      .y = 0,
      .width = width,
      .height = height,
  };
 
  glGenTextures(1, &provider->texture_id);
  glGenFramebuffers(1, &provider->framebuffer_id);
 
  glBindFramebuffer(GL_FRAMEBUFFER, provider->framebuffer_id);
 
  glBindTexture(GL_TEXTURE_2D, provider->texture_id);
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA,
               GL_UNSIGNED_BYTE, NULL);
  glBindTexture(GL_TEXTURE_2D, 0);
 
  glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
                         GL_TEXTURE_2D, provider->texture_id, 0);
 
  return provider;
}