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Diffstat (limited to 'media/mca/filterfw/native/core/gl_env.h')
| -rw-r--r-- | media/mca/filterfw/native/core/gl_env.h | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/media/mca/filterfw/native/core/gl_env.h b/media/mca/filterfw/native/core/gl_env.h new file mode 100644 index 0000000..b61785f --- /dev/null +++ b/media/mca/filterfw/native/core/gl_env.h @@ -0,0 +1,261 @@ +/* + * Copyright (C) 2011 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef ANDROID_FILTERFW_CORE_GL_ENV_H +#define ANDROID_FILTERFW_CORE_GL_ENV_H + +#include <string> +#include <utility> +#include <map> + +#include "base/logging.h" +#include "base/utilities.h" + +#include <GLES2/gl2.h> +#include <EGL/egl.h> + +#include <gui/ISurfaceTexture.h> +#include <gui/SurfaceTextureClient.h> + +namespace android { +namespace filterfw { + +class ShaderProgram; +class VertexFrame; + +class WindowHandle { + public: + virtual ~WindowHandle() { + } + + virtual void Destroy() = 0; + + virtual bool Equals(const WindowHandle* window) const { + return InternalHandle() == window->InternalHandle(); + } + + virtual const void* InternalHandle() const = 0; + + virtual void* InternalHandle() = 0; +}; + +// The GLEnv class provides functionality related to the EGL environment, which +// includes the display, context, and surface. It is possible to either create +// a new environment or base it off the currently active EGL environment. In +// order to do the latter, an EGL environment must be setup already (though not +// necessarily through this class), and have an active display, context, and +// surface. +class GLEnv { + public: + // Constructing and Activating ///////////////////////////////////////////// + // Constructs a new GLEnv object. This does not create a GL context. + GLEnv(); + + // Destructor. Tears down and deallocates any GL objects that were created + // by this instance. + ~GLEnv(); + + // Inits a new GL environment, including a new surface and context. You + // must call Activate() before performing any GL operations. + bool InitWithNewContext(); + + // Inits the GL environment from the current GL environment. Use this when + // there is already a display, surface and context available (possibly + // created by the host application). You do not need to call Activate() as + // this context is active already. + bool InitWithCurrentContext(); + + // Activates the environment, and makes the associated GL context the + // current context. Creates the environment, if it has not been created + // already. Returns true if the activation was successful. + bool Activate(); + + // Deactivates the environment. Returns true if the deactivation was + // successful. You may want to call this when moving a context to another + // thread. In this case, deactivate the GLEnv in the old thread, and + // reactivate it in the new thread. + bool Deactivate(); + + // When rendering to a visible surface, call this to swap between the + // offscreen and onscreen buffers. Returns true if the buffer swap was + // successful. + bool SwapBuffers(); + + // Working with Surfaces /////////////////////////////////////////////////// + + // Add a surface to the environment. This surface will now be managed (and + // owned) by the GLEnv instance. Returns the id of the surface. + int AddSurface(const EGLSurface& surface); + + // Add a window surface to the environment. The window is passed in as + // an opaque window handle. + // This surface will now be managed (and owned) by the GLEnv instance. + // Returns the id of the surface. + int AddWindowSurface(const EGLSurface& surface, WindowHandle* window_handle); + + // Switch to the surface with the specified id. This will make the surface + // active, if it is not active already. Specify an ID of 0 if you would like + // to switch to the default surface. Returns true if successful. + bool SwitchToSurfaceId(int surface_id); + + // Release the surface with the specified id. This will deallocate the + // surface. If this is the active surface, the environment will switch to + // the default surface (0) first. You cannot release the default surface. + bool ReleaseSurfaceId(int surface_id); + + // Set the timestamp for the current surface. Must be called + // before swapBuffers to associate the timestamp with the frame + // resulting from swapBuffers. + bool SetSurfaceTimestamp(int64_t timestamp); + + // Looks for a surface with the associated window handle. Returns -1 if no + // surface with such a window was found. + int FindSurfaceIdForWindow(const WindowHandle* window_handle); + + // Obtain the environment's EGL surface. + const EGLSurface& surface() const { + return surfaces_.find(surface_id_)->second.first; + } + + // Working with Contexts /////////////////////////////////////////////////// + + // Add a context to the environment. This context will now be managed (and + // owned) by the GLEnv instance. Returns the id of the context. + int AddContext(const EGLContext& context); + + // Switch to the context with the specified id. This will make the context + // active, if it is not active already. Specify an ID of 0 if you would like + // to switch to the default context. Returns true if successful. + bool SwitchToContextId(int context_id); + + // Release the context with the specified id. This will deallocate the + // context. If this is the active context, the environment will switch to + // the default context (0) first. You cannot release the default context. + void ReleaseContextId(int context_id); + + // Obtain the environment's EGL context. + const EGLContext& context() const { + return contexts_.find(context_id_)->second; + } + + // Working with the Display //////////////////////////////////////////////// + + // Obtain the environment's EGL display. + const EGLDisplay& display() const { + return display_; + } + + // Inspecting the environment ////////////////////////////////////////////// + // Returns true if the environment is active in the current thread. + bool IsActive() const; + + // Returns true if the environment's context is active in the curent thread. + bool IsContextActive() const; + + // Returns true if there is any EGL context active in the current thread. + // This need not be a context created by a GLEnv instance. + static bool IsAnyContextActive(); + + // Attaching GL objects //////////////////////////////////////////////////// + + // Attach a shader to the environment. The environment takes ownership of + // the shader. + void AttachShader(int key, ShaderProgram* shader); + + // Attach a vertex frame to the environment. The environment takes ownership + // of the frame. + void AttachVertexFrame(int key, VertexFrame* frame); + + // Return the shader with the specified key, or NULL if there is no such + // shader attached to this environment. + ShaderProgram* ShaderWithKey(int key); + + // Return the vertex frame with the specified key, or NULL if there is no + // such frame attached to this environment. + VertexFrame* VertexFrameWithKey(int key); + + // Static methods ////////////////////////////////////////////////////////// + // These operate on the currently active environment! + + // Checks if the current environment is in a GL error state. If so, it will + // output an error message referencing the given operation string. Returns + // true if there was at least one error. + static bool CheckGLError(const std::string& operation); + + // Checks if the current environment is in an EGL error state. If so, it + // will output an error message referencing the given operation string. + // Returns true if there was at least one error. + static bool CheckEGLError(const std::string& operation); + + // Get the currently used (shader) program. + static GLuint GetCurrentProgram(); + + // Get the currently active display. + static EGLDisplay GetCurrentDisplay(); + + // Returns the number of components for a given GL type. For instance, + // returns 4 for vec4, and 16 for mat4. + static int NumberOfComponents(GLenum type); + + private: + typedef std::pair<EGLSurface, WindowHandle*> SurfaceWindowPair; + + // Initializes a new GL environment. + bool Init(); + + // Returns true if one of the Inits has been called successfully on this + // instance. + bool IsInitialized() const; + + // Outputs error messages specific to the operation eglMakeCurrent(). + // Returns true if there was at least one error. + static bool CheckEGLMakeCurrentError(); + + // The EGL display, contexts, and surfaces. + EGLDisplay display_; + std::map<int, EGLContext> contexts_; + std::map<int, SurfaceWindowPair> surfaces_; + + // The currently active context and surface ids. + int context_id_; + int surface_id_; + + // Dummy surface for context + sp<ANativeWindow> window_; + + // Dummy SurfaceTexture for context + sp<SurfaceTexture> surfaceTexture_; + + // The maximum surface id used. + int max_surface_id_; + + // These bools keep track of which objects this GLEnv has created (and + // owns). + bool created_context_; + bool created_surface_; + bool initialized_; + + // Attachments that GL objects can add to the environment. + std::map<int, ShaderProgram*> attached_shaders_; + std::map<int, VertexFrame*> attached_vframes_; + + DISALLOW_COPY_AND_ASSIGN(GLEnv); +}; + +} // namespace filterfw +} // namespace android + +#endif // ANDROID_FILTERFW_CORE_GL_ENV_H |