| // 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. |
| |
| #include "fl_renderer.h" |
| |
| #include "flutter/shell/platform/embedder/embedder.h" |
| |
| G_DEFINE_QUARK(fl_renderer_error_quark, fl_renderer_error) |
| |
| typedef struct { |
| EGLDisplay egl_display; |
| EGLSurface egl_surface; |
| EGLContext egl_context; |
| } FlRendererPrivate; |
| |
| G_DEFINE_TYPE_WITH_PRIVATE(FlRenderer, fl_renderer, G_TYPE_OBJECT) |
| |
| // Default implementation for the start virtual method. |
| // Provided so subclasses can chain up to here. |
| static gboolean fl_renderer_real_start(FlRenderer* self, GError** error) { |
| FlRendererPrivate* priv = |
| static_cast<FlRendererPrivate*>(fl_renderer_get_instance_private(self)); |
| |
| // Note the use of EGL_DEFAULT_DISPLAY rather than sharing an existing display |
| // connection (e.g. an X11 connection from GTK). This is because this EGL |
| // display is going to be accessed by a thread from Flutter. In the case |
| // of GTK/X11 the display connection is not thread safe and this would cause |
| // a crash. |
| // |
| priv->egl_display = eglGetDisplay(EGL_DEFAULT_DISPLAY); |
| |
| if (!eglInitialize(priv->egl_display, nullptr, nullptr)) { |
| g_set_error(error, fl_renderer_error_quark(), FL_RENDERER_ERROR_FAILED, |
| "Failed to initialze EGL"); |
| return FALSE; |
| } |
| |
| EGLint attributes[] = {EGL_RENDERABLE_TYPE, |
| EGL_OPENGL_ES2_BIT, |
| EGL_RED_SIZE, |
| 8, |
| EGL_GREEN_SIZE, |
| 8, |
| EGL_BLUE_SIZE, |
| 8, |
| EGL_ALPHA_SIZE, |
| 8, |
| EGL_NONE}; |
| EGLConfig egl_config; |
| EGLint n_config; |
| if (!eglChooseConfig(priv->egl_display, attributes, &egl_config, 1, |
| &n_config)) { |
| g_set_error(error, fl_renderer_error_quark(), FL_RENDERER_ERROR_FAILED, |
| "Failed to choose EGL config"); |
| return FALSE; |
| } |
| if (n_config == 0) { |
| g_set_error(error, fl_renderer_error_quark(), FL_RENDERER_ERROR_FAILED, |
| "Failed to find appropriate EGL config"); |
| return FALSE; |
| } |
| if (!eglBindAPI(EGL_OPENGL_ES_API)) { |
| g_set_error(error, fl_renderer_error_quark(), FL_RENDERER_ERROR_FAILED, |
| "Failed to bind EGL OpenGL ES API"); |
| return FALSE; |
| } |
| |
| priv->egl_surface = FL_RENDERER_GET_CLASS(self)->create_surface( |
| self, priv->egl_display, egl_config); |
| EGLint context_attributes[] = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE}; |
| priv->egl_context = eglCreateContext(priv->egl_display, egl_config, |
| EGL_NO_CONTEXT, context_attributes); |
| EGLint value; |
| eglQueryContext(priv->egl_display, priv->egl_context, |
| EGL_CONTEXT_CLIENT_VERSION, &value); |
| |
| return TRUE; |
| } |
| |
| static void fl_renderer_class_init(FlRendererClass* klass) { |
| klass->start = fl_renderer_real_start; |
| } |
| |
| static void fl_renderer_init(FlRenderer* self) {} |
| |
| gboolean fl_renderer_start(FlRenderer* self, GError** error) { |
| return FL_RENDERER_GET_CLASS(self)->start(self, error); |
| } |
| |
| void* fl_renderer_get_proc_address(FlRenderer* self, const char* name) { |
| return reinterpret_cast<void*>(eglGetProcAddress(name)); |
| } |
| |
| gboolean fl_renderer_make_current(FlRenderer* self, GError** error) { |
| FlRendererPrivate* priv = |
| static_cast<FlRendererPrivate*>(fl_renderer_get_instance_private(self)); |
| |
| if (!eglMakeCurrent(priv->egl_display, priv->egl_surface, priv->egl_surface, |
| priv->egl_context)) { |
| g_set_error(error, fl_renderer_error_quark(), FL_RENDERER_ERROR_FAILED, |
| "Failed to make EGL context current"); |
| return FALSE; |
| } |
| |
| return TRUE; |
| } |
| |
| gboolean fl_renderer_clear_current(FlRenderer* self, GError** error) { |
| FlRendererPrivate* priv = |
| static_cast<FlRendererPrivate*>(fl_renderer_get_instance_private(self)); |
| |
| if (!eglMakeCurrent(priv->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, |
| EGL_NO_CONTEXT)) { |
| g_set_error(error, fl_renderer_error_quark(), FL_RENDERER_ERROR_FAILED, |
| "Failed to clear EGL context"); |
| return FALSE; |
| } |
| |
| return TRUE; |
| } |
| |
| guint32 fl_renderer_get_fbo(FlRenderer* self) { |
| // There is only one frame buffer object - always return that |
| return 0; |
| } |
| |
| gboolean fl_renderer_present(FlRenderer* self, GError** error) { |
| FlRendererPrivate* priv = |
| static_cast<FlRendererPrivate*>(fl_renderer_get_instance_private(self)); |
| |
| if (!eglSwapBuffers(priv->egl_display, priv->egl_surface)) { |
| g_set_error(error, fl_renderer_error_quark(), FL_RENDERER_ERROR_FAILED, |
| "Failed to swap EGL buffers"); |
| return FALSE; |
| } |
| |
| return TRUE; |
| } |