[android] headless view for egl

2 files changed, 187 insertions, 0 deletions

diff --git a/include/mbgl/platform/default/headless_view.hpp b/include/mbgl/platform/default/headless_view.hpp
index 23f1e8251a..0a921b93f2 100644
--- a/include/mbgl/platform/default/headless_view.hpp
+++ b/include/mbgl/platform/default/headless_view.hpp
@@ -10,6 +10,9 @@ class QGLWidget;
 #else
 #define MBGL_USE_CGL 1
 #endif
+#elif __ANDROID__
+#include <EGL/egl.h>
+#define MBGL_USE_EGL 1
 #else
 #define GL_GLEXT_PROTOTYPES
 #define MBGL_USE_GLX 1
@@ -89,6 +92,13 @@ private:
     GLXPbuffer glxPbuffer = 0;
 #endif
 
+#if MBGL_USE_EGL
+    EGLDisplay glDisplay = EGL_NO_DISPLAY;
+    EGLConfig glConfig = nullptr;	
+    EGLSurface glSurface = EGL_NO_SURFACE;
+    EGLContext glContext = EGL_NO_CONTEXT;
+#endif
+
     std::function<void(MapChange)> mapChangeCallback;
 
     gl::FramebufferID fbo = 0;
diff --git a/platform/android/src/headless_view_egl.cpp b/platform/android/src/headless_view_egl.cpp
new file mode 100644
index 0000000000..51a8509f31
--- /dev/null
+++ b/platform/android/src/headless_view_egl.cpp
@@ -0,0 +1,177 @@
+#include <mbgl/platform/default/headless_view.hpp>
+#include <mbgl/platform/default/headless_display.hpp>
+#include <mbgl/platform/log.hpp>
+
+#include <cassert>
+
+#include <EGL/egl.h>
+
+namespace mbgl {
+
+//Android seems to be very specific here...,
+static const EGLint configAttribs[] = {
+    EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
+    EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+    EGL_RED_SIZE, 8,
+    EGL_GREEN_SIZE, 8,
+    EGL_BLUE_SIZE, 8,
+    EGL_ALPHA_SIZE, 8,
+    EGL_DEPTH_SIZE, 0,
+    EGL_STENCIL_SIZE, 0,
+    EGL_NONE
+};
+
+gl::glProc HeadlessView::initializeExtension(const char* name) {
+    Log::Info(Event::Android, "Initialize extension: %s", name);
+    return eglGetProcAddress(name);
+}
+
+void HeadlessView::createContext() {
+    Log::Info(Event::Android, "Create context");
+
+    //Connect to display system
+    glDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+    if(glDisplay == EGL_NO_DISPLAY){
+        throw std::runtime_error("Could not connect to display");
+    }
+
+    //Initialize
+    EGLint major, minor;
+    if(!eglInitialize(glDisplay, &major, &minor)) {
+        Log::Error(Event::Android, "Could not initialize egl");
+    }
+
+    //Choose a matching configuration
+    EGLint numConfigs;
+    if(!eglChooseConfig(glDisplay, configAttribs, &glConfig, 1, &numConfigs)) {
+        throw std::runtime_error( "Could not choose config");
+    }
+
+    //Create a PBuffer surface (in conjunction with EGL_SURFACE_TYPE, EGL_PBUFFER_BIT)
+    EGLint surfAttribs[] = {
+        EGL_WIDTH, 512,
+        EGL_HEIGHT, 512,
+        EGL_LARGEST_PBUFFER, EGL_TRUE,
+        EGL_NONE
+    };
+
+    glSurface = eglCreatePbufferSurface(glDisplay, glConfig, surfAttribs);
+    if(glSurface == EGL_NO_SURFACE) {
+        throw std::runtime_error("Could not create surface: " + std::to_string(eglGetError()));
+    }
+
+    //Bind
+    eglBindAPI(EGL_OPENGL_API);
+
+
+    //And, create  the context finally
+    GLint contextAttrs[] =
+    {
+        EGL_CONTEXT_CLIENT_VERSION, 2,
+        EGL_NONE
+    };
+    glContext = eglCreateContext(glDisplay, glConfig, EGL_NO_CONTEXT, contextAttrs);
+
+    if (glContext == EGL_NO_CONTEXT) {
+        throw std::runtime_error("Could not create context");
+    }
+}
+
+void HeadlessView::destroyContext() {
+    Log::Info(Event::Android, "Destroy context");
+
+    //Destroy context
+    if (glContext != EGL_NO_CONTEXT) {
+        eglDestroyContext(glDisplay, glContext);
+        glContext = EGL_NO_CONTEXT;
+    }
+
+    //Destroy surface
+    if (glSurface != EGL_NO_SURFACE) {
+        eglDestroySurface(glDisplay, glSurface);
+        glSurface = EGL_NO_SURFACE;
+    }
+
+    //Terminate display
+    if(glDisplay != EGL_NO_DISPLAY) {
+        eglTerminate(glDisplay);
+        glDisplay = EGL_NO_DISPLAY;
+    }
+}
+
+void HeadlessView::resizeFramebuffer() {
+    const unsigned int w = dimensions[0] * pixelRatio;
+    const unsigned int h = dimensions[1] * pixelRatio;
+
+    // Create depth/stencil buffer
+    MBGL_CHECK_ERROR(glGenRenderbuffers(1, &fboDepthStencil));
+    MBGL_CHECK_ERROR(glBindRenderbuffer(GL_RENDERBUFFER, fboDepthStencil));
+    MBGL_CHECK_ERROR(glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8_OES, w, h));
+    MBGL_CHECK_ERROR(glBindRenderbuffer(GL_RENDERBUFFER, 0));
+
+    MBGL_CHECK_ERROR(glGenRenderbuffers(1, &fboColor));
+    MBGL_CHECK_ERROR(glBindRenderbuffer(GL_RENDERBUFFER, fboColor));
+    MBGL_CHECK_ERROR(glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8_OES, w, h));
+    MBGL_CHECK_ERROR(glBindRenderbuffer(GL_RENDERBUFFER, 0));
+
+    MBGL_CHECK_ERROR(glGenFramebuffers(1, &fbo));
+    MBGL_CHECK_ERROR(glBindFramebuffer(GL_FRAMEBUFFER, fbo));
+
+    MBGL_CHECK_ERROR(glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, fboColor));
+    MBGL_CHECK_ERROR(glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fboDepthStencil));
+    MBGL_CHECK_ERROR(glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fboDepthStencil));
+
+    GLenum status = MBGL_CHECK_ERROR(glCheckFramebufferStatus(GL_FRAMEBUFFER));
+
+    if (status != GL_FRAMEBUFFER_COMPLETE) {
+        std::string error("Couldn't create framebuffer: ");
+        switch (status) {
+            case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: (error += "incomplete attachment"); break;
+            case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: error += "incomplete missing attachment"; break;
+            case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS: error += "incomplete dimensions"; break;
+            case GL_FRAMEBUFFER_UNSUPPORTED: error += "unsupported"; break;
+            default: error += "other"; break;
+        }
+        throw std::runtime_error(error);
+    }
+
+    MBGL_CHECK_ERROR(glViewport(0, 0, w, h));
+}
+
+void HeadlessView::clearBuffers() {
+	Log::Info(Event::Android, "Clear buffers");
+	MBGL_CHECK_ERROR(glBindFramebuffer(GL_FRAMEBUFFER, 0));
+
+	if (fbo) {
+		MBGL_CHECK_ERROR(glDeleteFramebuffers(1, &fbo));
+		fbo = 0;
+	}
+
+	if (fboColor) {
+		MBGL_CHECK_ERROR(glDeleteRenderbuffers(1, &fboColor));
+		fboColor = 0;
+	}
+
+	if (fboDepthStencil) {
+		MBGL_CHECK_ERROR(glDeleteRenderbuffers(1, &fboDepthStencil));
+		fboDepthStencil = 0;
+	}
+}
+
+void HeadlessView::activateContext() {
+	Log::Info(Event::Android, "Activate context");
+	if(eglMakeCurrent(glDisplay, glSurface, glSurface, glContext) != EGL_TRUE) {
+		Log::Info(Event::Android, "Error activating context");
+		throw std::runtime_error("Error activating context");
+	}
+}
+
+void HeadlessView::deactivateContext() {
+	Log::Info(Event::Android, "Deactivate context");
+	if(eglMakeCurrent(glDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT) != EGL_TRUE) {
+		Log::Info(Event::Android, "Error deactivating context");
+		throw std::runtime_error("Error deactivating context");
+	}
+}
+
+} // namespace mbgl