Implement renderer instance which composes multiple layers into a window

src/CMakeLists.txt

@@ -105,6 +105,9 @@ set(SOURCES
     anbox/graphics/gl_renderer_server.cpp
     anbox/graphics/density.h
     anbox/graphics/rect.cpp
+    anbox/graphics/layer_composer.cpp
+    anbox/graphics/program_family.cpp
+    anbox/graphics/primitives.h
 
     anbox/graphics/emugl/ColorBuffer.cpp
     anbox/graphics/emugl/DisplayManager.cpp

src/anbox/cmds/run.cpp

@@ -95,7 +95,7 @@ anbox::cmds::Run::Run(const BusFactory& bus_factory)
 
         auto window_manager = std::make_shared<wm::Manager>(policy);
 
-        auto renderer = std::make_shared<graphics::GLRendererServer>();
+        auto renderer = std::make_shared<graphics::GLRendererServer>(window_manager);
         renderer->start();
 
         // Socket which will be used by the qemud service inside the Android

src/anbox/graphics/emugl/ColorBuffer.cpp

@@ -376,11 +376,6 @@ bool ColorBuffer::bindToRenderbuffer() {
     return true;
 }
 
-bool ColorBuffer::post(float rotation, float dx, float dy) {
-    // NOTE: Do not call m_helper->setupContext() here!
-    return m_helper->getTextureDraw()->draw(m_resizer->update(m_tex));
-}
-
 void ColorBuffer::readback(unsigned char* img) {
     ScopedHelperContext context(m_helper);
     if (!context.isOk()) {
@@ -392,3 +387,8 @@ void ColorBuffer::readback(unsigned char* img) {
         unbindFbo();
     }
 }
+
+void ColorBuffer::bind() {
+    const auto id = m_resizer->update(m_tex);
+    s_gles2.glBindTexture(GL_TEXTURE_2D, id);
+}

src/anbox/graphics/emugl/ColorBuffer.h

@@ -108,15 +108,6 @@ public:
                    GLenum p_type,
                    void *pixels);
 
-    // Draw a ColorBuffer instance, i.e. blit it to the current guest
-    // framebuffer object / window surface. This doesn't display anything.
-    bool draw();
-
-    // Post this ColorBuffer to the host native sub-window.
-    // |rotation| is the rotation angle in degrees, clockwise in the GL
-    // coordinate space.
-    bool post(float rotation, float dx, float dy);
-
     // Bind the current context's EGL_TEXTURE_2D texture to this ColorBuffer's
     // EGLImage. This is intended to implement glEGLImageTargetTexture2DOES()
     // for all GLES versions.
@@ -136,6 +127,7 @@ public:
     // |img| must be a buffer large enough (i.e. width * height * 4).
     void readback(unsigned char* img);
 
+    void bind();
 private:
     ColorBuffer();  // no default constructor.
 

src/anbox/graphics/emugl/RenderControl.cpp

@@ -24,10 +24,19 @@
 
 #include "OpenGLESDispatch/EGLDispatch.h"
 
+#include "anbox/graphics/layer_composer.h"
+#include "anbox/logger.h"
+
 #include <map>
 #include <string>
 
 static const GLint rendererVersion = 1;
+static std::shared_ptr<anbox::graphics::LayerComposer> composer;
+
+void registerLayerComposer(const std::shared_ptr<anbox::graphics::LayerComposer> &c)
+{
+    composer = c;
+}
 
 static GLint rcGetRendererVersion()
 {
@@ -305,12 +314,7 @@ static EGLint rcMakeCurrent(uint32_t context,
 
 static void rcFBPost(uint32_t colorBuffer)
 {
-    Renderer *fb = Renderer::get();
-    if (!fb) {
-        return;
-    }
-
-    fb->post(nullptr, colorBuffer);
+    WARNING("Not implemented");
 }
 
 static void rcFBSetSwapInterval(EGLint interval)
@@ -425,15 +429,31 @@ int rcGetDisplayVsyncPeriod(uint32_t display_id) {
     return 1;
 }
 
+static std::vector<Renderable> frame_layers;
+
+bool is_layer_blacklisted(const std::string &name) {
+    static std::vector<std::string> blacklist = {
+        "Sprite",
+    };
+    return std::find(blacklist.begin(), blacklist.end(), name) != blacklist.end();
+}
+
 void rcPostLayer(const char *name, uint32_t color_buffer,
                  int32_t sourceCropLeft, int32_t sourceCropTop,
                  int32_t sourceCropRight, int32_t sourceCropBottom,
                  int32_t displayFrameLeft, int32_t displayFrameTop,
-                 int32_t displayFrameRight, int32_t displayFrameBottom) {
-
+                 int32_t displayFrameRight, int32_t displayFrameBottom)
+{
+    Renderable r{name, color_buffer, {displayFrameLeft, displayFrameTop, displayFrameRight, displayFrameBottom}};
+    frame_layers.push_back(r);
 }
 
-void rcPostAllLayersDone() {
+void rcPostAllLayersDone()
+{
+    if (composer)
+        composer->submit_layers(frame_layers);
+
+    frame_layers.clear();
 }
 
 void initRenderControlContext(renderControl_decoder_context_t *dec)

src/anbox/graphics/emugl/RenderControl.h

@@ -18,6 +18,15 @@
 
 #include "renderControl_dec.h"
 
+#include <memory>
+
+namespace anbox {
+namespace graphics {
+class LayerComposer;
+} // namespace graphics
+} // namespace anbox
+
 void initRenderControlContext(renderControl_decoder_context_t *dec);
+void registerLayerComposer(const std::shared_ptr<anbox::graphics::LayerComposer> &c);
 
 #endif

src/anbox/graphics/emugl/Renderable.cpp

@@ -16,10 +16,16 @@
 
 #include "Renderable.h"
 
-Renderable::Renderable(const std::uint32_t &buffer,
-                       const anbox::graphics::Rect &screen_position) :
+Renderable::Renderable(const std::string &name,
+                       const std::uint32_t &buffer,
+                       const anbox::graphics::Rect &screen_position,
+                       const glm::mat4 &transformation,
+                       const float &alpha) :
+    name_(name),
     buffer_(buffer),
-    screen_position_(screen_position)
+    screen_position_(screen_position),
+    transformation_(transformation),
+    alpha_(alpha)
 {
 }
 
@@ -27,6 +33,11 @@ Renderable::~Renderable()
 {
 }
 
+std::string Renderable::name() const
+{
+    return name_;
+}
+
 std::uint32_t Renderable::buffer() const
 {
     return buffer_;
@@ -36,3 +47,13 @@ anbox::graphics::Rect Renderable::screen_position() const
 {
     return screen_position_;
 }
+
+glm::mat4 Renderable::transformation() const
+{
+    return transformation_;
+}
+
+float Renderable::alpha() const
+{
+    return alpha_;
+}

src/anbox/graphics/emugl/Renderable.h

@@ -19,23 +19,35 @@
 
 #include "anbox/graphics/rect.h"
 
+#include <string>
 #include <vector>
 
 #include <cstdint>
 
+#include <glm/glm.hpp>
+
 class Renderable
 {
 public:
-    Renderable(const std::uint32_t &buffer,
-               const anbox::graphics::Rect &screen_position);
+    Renderable(const std::string &name,
+               const std::uint32_t &buffer,
+               const anbox::graphics::Rect &screen_position,
+               const glm::mat4 &transformation = {},
+               const float &alpha = 1.0f);
     ~Renderable();
 
+    std::string name() const;
     std::uint32_t buffer() const;
     anbox::graphics::Rect screen_position() const;
+    glm::mat4 transformation() const;
+    float alpha() const;
 
 private:
+    std::string name_;
     std::uint32_t buffer_;
     anbox::graphics::Rect screen_position_;
+    glm::mat4 transformation_;
+    float alpha_;
 };
 
 typedef std::vector<Renderable> RenderableList;

src/anbox/graphics/emugl/Renderer.cpp

@@ -25,8 +25,14 @@
 
 #include "emugl/common/logging.h"
 
+#include "anbox/logger.h"
+
 #include <stdio.h>
 
+#include <glm/glm.hpp>
+#include <glm/gtx/transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
 namespace {
 
 // Helper class to call the bind_locked() / unbind_locked() properly.
@@ -415,6 +421,9 @@ bool Renderer::initialize(EGLNativeDisplayType nativeDisplay)
         return false;
     }
 
+    fb->m_defaultProgram = fb->m_family.add_program(vshader, defaultFShader);
+    fb->m_alphaProgram = fb->m_family.add_program(vshader, alphaFShader);
+
     // release the FB context
     bind.release();
 
@@ -426,6 +435,19 @@ bool Renderer::initialize(EGLNativeDisplayType nativeDisplay)
     return true;
 }
 
+Renderer::Program::Program(GLuint program_id)
+{
+    id = program_id;
+    position_attr = s_gles2.glGetAttribLocation(id, "position");
+    texcoord_attr = s_gles2.glGetAttribLocation(id, "texcoord");
+    tex_uniform = s_gles2.glGetUniformLocation(id, "tex");
+    centre_uniform = s_gles2.glGetUniformLocation(id, "centre");
+    display_transform_uniform = s_gles2.glGetUniformLocation(id, "display_transform");
+    transform_uniform = s_gles2.glGetUniformLocation(id, "transform");
+    screen_to_gl_coords_uniform = s_gles2.glGetUniformLocation(id, "screen_to_gl_coords");
+    alpha_uniform = s_gles2.glGetUniformLocation(id, "alpha");
+}
+
 Renderer::Renderer() :
     m_configs(NULL),
     m_eglDisplay(EGL_NO_DISPLAY),
@@ -455,6 +477,9 @@ Renderer::~Renderer() {
 struct RendererWindow {
     EGLNativeWindowType native_window = 0;
     EGLSurface surface = EGL_NO_SURFACE;
+    anbox::graphics::Rect viewport;
+    glm::mat4 screen_to_gl_coords;
+    glm::mat4 display_transform;
 };
 
 RendererWindow* Renderer::createNativeWindow(EGLNativeWindowType native_window)
@@ -480,7 +505,6 @@ RendererWindow* Renderer::createNativeWindow(EGLNativeWindowType native_window)
         return nullptr;
     }
 
-    // s_gles2.glViewport(0, 0, width, height);
     s_gles2.glClear(GL_COLOR_BUFFER_BIT |
                     GL_DEPTH_BUFFER_BIT |
                     GL_STENCIL_BUFFER_BIT);
@@ -954,68 +978,172 @@ bool Renderer::unbind_locked()
     return true;
 }
 
-bool Renderer::post(RendererWindow *window, HandleType p_colorbuffer, bool needLock)
+const GLchar* const Renderer::vshader =
 {
-    if (!window)
-        return false;
+    "attribute vec3 position;\n"
+    "attribute vec2 texcoord;\n"
+    "uniform mat4 screen_to_gl_coords;\n"
+    "uniform mat4 display_transform;\n"
+    "uniform mat4 transform;\n"
+    "uniform vec2 centre;\n"
+    "varying vec2 v_texcoord;\n"
+    "void main() {\n"
+    "   vec4 mid = vec4(centre, 0.0, 0.0);\n"
+    "   vec4 transformed = (transform * (vec4(position, 1.0) - mid)) + mid;\n"
+    "   gl_Position = display_transform * screen_to_gl_coords * transformed;\n"
+    "   v_texcoord = texcoord;\n"
+    "}\n"
+};
 
-    if (needLock)
-        m_lock.lock();
+const GLchar* const Renderer::alphaFShader =
+{
+    "precision mediump float;\n"
+    "uniform sampler2D tex;\n"
+    "uniform float alpha;\n"
+    "varying vec2 v_texcoord;\n"
+    "void main() {\n"
+    "   vec4 frag = texture2D(tex, v_texcoord);\n"
+    "   gl_FragColor = alpha*frag;\n"
+    "}\n"
+};
 
-    bool ret;
+const GLchar* const Renderer::defaultFShader =
+{   // This is the fastest fragment shader. Use it when you can.
+    "precision mediump float;\n"
+    "uniform sampler2D tex;\n"
+    "varying vec2 v_texcoord;\n"
+    "void main() {\n"
+    "   gl_FragColor = texture2D(tex, v_texcoord);\n"
+    "}\n"
+};
 
-    ColorBufferMap::iterator c( m_colorbuffers.find(p_colorbuffer) );
-    if (c == m_colorbuffers.end())
-        goto EXIT;
+void Renderer::setupViewport(RendererWindow *window, const anbox::graphics::Rect &rect)
+{
+    /*
+     * Here we provide a 3D perspective projection with a default 30 degrees
+     * vertical field of view. This projection matrix is carefully designed
+     * such that any vertices at depth z=0 will fit the screen coordinates. So
+     * client texels will fit screen pixels perfectly as long as the surface is
+     * at depth zero. But if you want to do anything fancy, you can also choose
+     * a different depth and it will appear to come out of or go into the
+     * screen.
+     */
+    window->screen_to_gl_coords = glm::translate(glm::mat4(1.0f), glm::vec3{-1.0f, 1.0f, 0.0f});
 
-    m_lastPostedColorBuffer = p_colorbuffer;
+    /*
+     * Perspective division is one thing that can't be done in a matrix
+     * multiplication. It happens after the matrix multiplications. GL just
+     * scales {x,y} by 1/w. So modify the final part of the projection matrix
+     * to set w ([3]) to be the incoming z coordinate ([2]).
+     */
+    window->screen_to_gl_coords[2][3] = -1.0f;
 
-    if (!bindWindow_locked(window))
-        goto EXIT;
+    float const vertical_fov_degrees = 30.0f;
+    float const near =
+        (rect.height() / 2.0f) /
+        std::tan((vertical_fov_degrees * M_PI / 180.0f) / 2.0f);
+    float const far = -near;
 
-#if 0
-    if (window->needViewportUpdate) {
-        s_gles2.glViewport(0, 0, window->width, window->height);
-        window->needViewportUpdate = false;
-    }
-#endif
+    window->screen_to_gl_coords = glm::scale(window->screen_to_gl_coords,
+            glm::vec3{2.0f / rect.width(),
+                      -2.0f / rect.height(),
+                      2.0f / (near - far)});
+    window->screen_to_gl_coords = glm::translate(window->screen_to_gl_coords,
+            glm::vec3{-rect.left(),
+                      -rect.top(),
+                      0.0f});
 
-    s_gles2.glClearColor(0.0, 0.0, 1.0, 0.0);
-    s_gles2.glClear(GL_COLOR_BUFFER_BIT);
-
-    ret = (*c).second.cb->post(0.0f, 0, 0);
-    if (ret) {
-        s_egl.eglSwapBuffers(m_eglDisplay, window->surface);
-    }
-
-    // restore previous binding
-    unbind_locked();
-
-    //
-    // output FPS statistics
-    //
-    if (m_fpsStats) {
-        long long currTime = GetCurrentTimeMS();
-        m_statsNumFrames++;
-        if (currTime - m_statsStartTime >= 1000) {
-            float dt = (float)(currTime - m_statsStartTime) / 1000.0f;
-            printf("FPS: %5.3f\n", (float)m_statsNumFrames / dt);
-            m_statsStartTime = currTime;
-            m_statsNumFrames = 0;
-        }
-    }
-
-EXIT:
-    if (!ret)
-        printf("post: FAILED\n");
-
-    if (needLock) {
-        m_lock.unlock();
-    }
-    return ret;
+    window->viewport = rect;
 }
 
-bool Renderer::draw(EGLNativeWindowType native_window, const RenderableList &renderables)
+void Renderer::tessellate(std::vector<anbox::graphics::Primitive>& primitives,
+                          const anbox::graphics::Rect &buf_size,
+                          const Renderable &renderable)
+{
+    auto rect = renderable.screen_position();
+    GLfloat left = rect.left();
+    GLfloat right = rect.right();
+    GLfloat top = rect.top();
+    GLfloat bottom = rect.bottom();
+
+    anbox::graphics::Primitive rectangle;
+    rectangle.tex_id = 0;
+    rectangle.type = GL_TRIANGLE_STRIP;
+
+    GLfloat tex_right = static_cast<GLfloat>(rect.width()) /
+                        buf_size.width();
+    GLfloat tex_bottom = static_cast<GLfloat>(rect.height()) /
+                         buf_size.height();
+
+    auto& vertices = rectangle.vertices;
+    vertices[0] = {{left,  top,    0.0f}, {0.0f,      0.0f}};
+    vertices[1] = {{left,  bottom, 0.0f}, {0.0f,      tex_bottom}};
+    vertices[2] = {{right, top,    0.0f}, {tex_right, 0.0f}};
+    vertices[3] = {{right, bottom, 0.0f}, {tex_right, tex_bottom}};
+
+    primitives.resize(1);
+    primitives[0] = rectangle;
+}
+
+void Renderer::draw(RendererWindow *window, const Renderable &renderable, const Program &prog)
+{
+    const auto &color_buffer = m_colorbuffers.find(renderable.buffer());
+    if (color_buffer == m_colorbuffers.end())
+        return;
+
+    const auto &cb = color_buffer->second.cb;
+
+    s_gles2.glUseProgram(prog.id);
+    s_gles2.glUniform1i(prog.tex_uniform, 0);
+    s_gles2.glUniformMatrix4fv(prog.display_transform_uniform, 1, GL_FALSE,
+                       glm::value_ptr(window->display_transform));
+    s_gles2.glUniformMatrix4fv(prog.screen_to_gl_coords_uniform, 1, GL_FALSE,
+                       glm::value_ptr(window->screen_to_gl_coords));
+
+    s_gles2.glActiveTexture(GL_TEXTURE0);
+
+    auto const& rect = renderable.screen_position();
+    GLfloat centrex = rect.left() +
+                      rect.width() / 2.0f;
+    GLfloat centrey = rect.top() +
+                      rect.height() / 2.0f;
+    s_gles2.glUniform2f(prog.centre_uniform, centrex, centrey);
+
+    s_gles2.glUniformMatrix4fv(prog.transform_uniform, 1, GL_FALSE,
+                       glm::value_ptr(renderable.transformation()));
+
+    if (prog.alpha_uniform >= 0)
+        s_gles2.glUniform1f(prog.alpha_uniform, renderable.alpha());
+
+    s_gles2.glEnableVertexAttribArray(prog.position_attr);
+    s_gles2.glEnableVertexAttribArray(prog.texcoord_attr);
+
+    m_primitives.clear();
+    tessellate(m_primitives, {cb->getWidth(), cb->getHeight()}, renderable);
+
+    for (auto const& p : m_primitives)
+    {
+        cb->bind();
+
+        s_gles2.glVertexAttribPointer(prog.position_attr, 3, GL_FLOAT,
+                              GL_FALSE, sizeof(anbox::graphics::Vertex),
+                              &p.vertices[0].position);
+        s_gles2.glVertexAttribPointer(prog.texcoord_attr, 2, GL_FLOAT,
+                              GL_FALSE, sizeof(anbox::graphics::Vertex),
+                              &p.vertices[0].texcoord);
+
+        s_gles2.glEnable(GL_BLEND);
+        s_gles2.glBlendFuncSeparate(GL_ONE, GL_ONE_MINUS_SRC_ALPHA,
+                                    GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+
+        s_gles2.glDrawArrays(p.type, 0, p.nvertices);
+    }
+
+    s_gles2.glDisableVertexAttribArray(prog.texcoord_attr);
+    s_gles2.glDisableVertexAttribArray(prog.position_attr);
+}
+
+bool Renderer::draw(EGLNativeWindowType native_window, const anbox::graphics::Rect &window_frame, const RenderableList &renderables)
 {
     auto w = m_nativeWindows.find(native_window);
     if (w == m_nativeWindows.end())
@@ -1027,18 +1155,13 @@ bool Renderer::draw(EGLNativeWindowType native_window, const RenderableList &ren
         return false;
     }
 
-    s_gles2.glClearColor(0.0, 0.0, 1.0, 0.0);
+    setupViewport(w->second, window_frame);
+    s_gles2.glClearColor(0.0, 0.0, 0.0, 1.0);
+    s_gles2.glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
     s_gles2.glClear(GL_COLOR_BUFFER_BIT);
 
-    for (const auto &renderable : renderables)
-    {
-        const auto &color_buffer = m_colorbuffers.find(renderable.buffer());
-        if (color_buffer == m_colorbuffers.end())
-            continue;
-
-        color_buffer->second.cb->post(0.0f,
-            renderable.screen_position().left(), renderable.screen_position().top());
-    }
+    for (const auto &r : renderables)
+        draw(w->second, r,  r.alpha() < 1.0f ? m_alphaProgram : m_defaultProgram);
 
     s_egl.eglSwapBuffers(m_eglDisplay, w->second->surface);
 

src/anbox/graphics/emugl/Renderer.h

@@ -27,6 +27,9 @@
 
 #include "Renderable.h"
 
+#include "anbox/graphics/program_family.h"
+#include "anbox/graphics/primitives.h"
+
 #include <EGL/egl.h>
 
 #include <map>
@@ -229,14 +232,7 @@ public:
                            int x, int y, int width, int height,
                            GLenum format, GLenum type, void *pixels);
 
-    // Display the content of a given ColorBuffer into the framebuffer's
-    // sub-window. |p_colorbuffer| is a handle value.
-    // |needLock| is used to indicate whether the operation requires
-    // acquiring/releasing the FrameBuffer instance's lock. It should be
-    // false only when called internally.
-    bool post(RendererWindow *window, HandleType p_colorbuffer, bool needLock = true);
-
-    bool draw(EGLNativeWindowType native_window, const RenderableList &renderables);
+    bool draw(EGLNativeWindowType native_window, const anbox::graphics::Rect &window_frame, const RenderableList &renderables);
 
     // Return the host EGLDisplay used by this instance.
     EGLDisplay getDisplay() const { return m_eglDisplay; }
@@ -259,6 +255,13 @@ private:
 
     bool bindWindow_locked(RendererWindow *window);
 
+    void setupViewport(RendererWindow *window, const anbox::graphics::Rect &rect);
+    struct Program;
+    void draw(RendererWindow *window, const Renderable &renderable, const Program &prog);
+    void tessellate(std::vector<anbox::graphics::Primitive>& primitives,
+                    const anbox::graphics::Rect &buf_size,
+                    const Renderable &renderable);
+
 private:
     static Renderer *s_renderer;
     static HandleType s_nextHandle;
@@ -292,5 +295,30 @@ private:
     const char* m_glVersion;
 
     std::map<EGLNativeWindowType,RendererWindow*> m_nativeWindows;
+
+    anbox::graphics::ProgramFamily m_family;
+    struct Program
+    {
+       GLuint id = 0;
+       GLint tex_uniform = -1;
+       GLint position_attr = -1;
+       GLint texcoord_attr = -1;
+       GLint centre_uniform = -1;
+       GLint display_transform_uniform = -1;
+       GLint transform_uniform = -1;
+       GLint screen_to_gl_coords_uniform = -1;
+       GLint alpha_uniform = -1;
+       mutable long long last_used_frameno = 0;
+
+       Program(GLuint program_id);
+       Program() {}
+    };
+    Program m_defaultProgram, m_alphaProgram;
+
+    std::vector<anbox::graphics::Primitive> m_primitives;
+
+    static const GLchar* const vshader;
+    static const GLchar* const defaultFShader;
+    static const GLchar* const alphaFShader;
 };
 #endif

src/anbox/graphics/gl_renderer_server.cpp

@@ -17,6 +17,9 @@
 
 #include "anbox/logger.h"
 #include "anbox/graphics/gl_renderer_server.h"
+#include "anbox/graphics/layer_composer.h"
+#include "anbox/graphics/emugl/RenderControl.h"
+#include "anbox/wm/manager.h"
 
 #include "OpenglRender/render_api.h"
 
@@ -26,7 +29,9 @@
 
 namespace anbox {
 namespace graphics {
-GLRendererServer::GLRendererServer()
+GLRendererServer::GLRendererServer(const std::shared_ptr<wm::Manager> &wm) :
+    wm_(wm),
+    composer_(std::make_shared<LayerComposer>(wm))
 {
 
     if (utils::is_env_set("USE_HOST_GLES")) {
@@ -43,6 +48,8 @@ GLRendererServer::GLRendererServer()
 
     if (!initLibrary())
         BOOST_THROW_EXCEPTION(std::runtime_error("Failed to initialize OpenGL renderer"));
+
+    registerLayerComposer(composer_);
 }
 
 GLRendererServer::~GLRendererServer() {

src/anbox/graphics/gl_renderer_server.h

@@ -25,11 +25,14 @@ namespace anbox {
 namespace input {
 class Manager;
 } // namespace input
+namespace wm {
+class Manager;
+} // namespace wm
 namespace graphics {
-class WindowCreator;
+class LayerComposer;
 class GLRendererServer {
 public:
-    GLRendererServer();
+    GLRendererServer(const std::shared_ptr<wm::Manager> &wm);
     ~GLRendererServer();
 
     void start();
@@ -38,6 +41,8 @@ public:
 
 private:
     std::string socket_path_;
+    std::shared_ptr<wm::Manager> wm_;
+    std::shared_ptr<LayerComposer> composer_;
 };
 
 } // namespace graphics

src/anbox/graphics/layer_composer.cpp

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2016 Simon Fels <morphis@gravedo.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "anbox/graphics/layer_composer.h"
+#include "anbox/graphics/emugl/Renderer.h"
+#include "anbox/wm/manager.h"
+#include "anbox/logger.h"
+
+namespace anbox {
+namespace graphics {
+LayerComposer::LayerComposer(const std::shared_ptr<wm::Manager> &wm) :
+    wm_(wm)
+{
+}
+
+LayerComposer::~LayerComposer()
+{
+}
+
+void LayerComposer::submit_layers(const RenderableList &renderables)
+{
+    std::map<std::shared_ptr<wm::Window>,RenderableList> win_layers;
+    for (const auto &renderable : renderables)
+    {
+        // Ignore all surfaces which are not meant for a task
+        if (!utils::string_starts_with(renderable.name(), "org.anbox.surface."))
+            continue;
+
+        wm::Task::Id task_id = 0;
+        if (sscanf(renderable.name().c_str(), "org.anbox.surface.%d", &task_id) != 1 || !task_id)
+            continue;
+
+        auto w = wm_->find_window_for_task(task_id);
+        if (!w)
+            continue;
+
+        if (win_layers.find(w) == win_layers.end()) {
+            win_layers.insert({w, {renderable}});
+            continue;
+        }
+
+        win_layers[w].push_back(renderable);
+    }
+
+    for (const auto &w : win_layers)
+        Renderer::get()->draw(w.first->native_handle(), w.first->state().frame(), w.second);
+}
+} // namespace graphics
+} // namespace anbox

src/anbox/graphics/layer_composer.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2016 Simon Fels <morphis@gravedo.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ANBOX_GRAPHICS_LAYER_COMPOSER_H_
+#define ANBOX_GRAPHICS_LAYER_COMPOSER_H_
+
+#include "anbox/graphics/emugl/Renderable.h"
+
+#include <memory>
+
+namespace anbox {
+namespace wm {
+class Manager;
+} // namespace wm
+namespace graphics {
+class LayerComposer {
+public:
+    LayerComposer(const std::shared_ptr<wm::Manager> &wm);
+    ~LayerComposer();
+
+    void submit_layers(const RenderableList &renderables);
+
+private:
+    std::shared_ptr<wm::Manager> wm_;
+};
+} // namespace graphics
+} // namespace anbox
+
+#endif

src/anbox/graphics/primitives.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2014 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authored by: Daniel van Vugt <daniel.van.vugt@canonical.com>
+ *              Kevin DuBois <kevin.dubois@canonical.com>
+ */
+
+
+#ifndef ANBOX_GRAPHICS_PRIMITIVES_H_
+#define ANBOX_GRAPHICS_PRIMITIVES_H_
+
+#include <GLES2/gl2.h>
+
+namespace anbox {
+namespace graphics {
+struct Vertex
+{
+    GLfloat position[3];
+    GLfloat texcoord[2];
+};
+
+struct Primitive
+{
+    enum {max_vertices = 4};
+
+    Primitive()
+        : type(GL_TRIANGLE_FAN), nvertices(4)
+    {
+        // Default is a quad. Just need to assign vertices[] and tex_id.
+    }
+
+    GLenum type; // GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES etc
+    GLuint tex_id;  // GL texture ID (or 0 to represent the surface itself)
+    int nvertices;
+    Vertex vertices[max_vertices];
+};
+} // namespace graphics
+} // namespace anbox
+
+#endif

src/anbox/graphics/program_family.cpp

@@ -0,0 +1,107 @@
+/*
+ * Copyright © 2015 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authored by: Daniel van Vugt <daniel.van.vugt@canonical.com>
+ */
+
+#include "anbox/graphics/program_family.h"
+
+#include "anbox/graphics/emugl/DispatchTables.h"
+
+namespace anbox {
+namespace graphics {
+void ProgramFamily::Shader::init(GLenum type, const GLchar* src)
+{
+    if (!id)
+    {
+        id = s_gles2.glCreateShader(type);
+        if (id)
+        {
+            s_gles2.glShaderSource(id, 1, &src, NULL);
+            s_gles2.glCompileShader(id);
+            GLint ok;
+            s_gles2.glGetShaderiv(id, GL_COMPILE_STATUS, &ok);
+            if (!ok)
+            {
+                GLchar log[1024];
+                s_gles2.glGetShaderInfoLog(id, sizeof log - 1, NULL, log);
+                log[sizeof log - 1] = '\0';
+                s_gles2.glDeleteShader(id);
+                id = 0;
+                throw std::runtime_error(std::string("Compile failed: ")+
+                                         log + " for:\n" + src);
+            }
+        }
+    }
+}
+
+ProgramFamily::~ProgramFamily() noexcept
+{
+    // shader and program lifetimes are managed manually, so that we don't
+    // need any reference counting or to worry about how many copy constructions
+    // might have been followed by destructor calls during container resizes.
+
+    for (auto& p : program)
+    {
+        if (p.second.id)
+            s_gles2.glDeleteProgram(p.second.id);
+    }
+
+    for (auto& v : vshader)
+    {
+        if (v.second.id)
+            s_gles2.glDeleteShader(v.second.id);
+    }
+
+    for (auto& f : fshader)
+    {
+        if (f.second.id)
+            s_gles2.glDeleteShader(f.second.id);
+    }
+}
+
+GLuint ProgramFamily::add_program(const GLchar* const vshader_src,
+                                    const GLchar* const fshader_src)
+{
+    auto& v = vshader[vshader_src];
+    if (!v.id) v.init(GL_VERTEX_SHADER, vshader_src);
+
+    auto& f = fshader[fshader_src];
+    if (!f.id) f.init(GL_FRAGMENT_SHADER, fshader_src);
+
+    auto& p = program[{v.id, f.id}];
+    if (!p.id)
+    {
+        p.id = s_gles2.glCreateProgram();
+        s_gles2.glAttachShader(p.id, v.id);
+        s_gles2.glAttachShader(p.id, f.id);
+        s_gles2.glLinkProgram(p.id);
+        GLint ok;
+        s_gles2.glGetProgramiv(p.id, GL_LINK_STATUS, &ok);
+        if (!ok)
+        {
+            GLchar log[1024];
+            s_gles2.glGetProgramInfoLog(p.id, sizeof log - 1, NULL, log);
+            log[sizeof log - 1] = '\0';
+            s_gles2.glDeleteShader(p.id);
+            p.id = 0;
+            throw std::runtime_error(std::string("Link failed: ")+log);
+        }
+    }
+
+    return p.id;
+}
+} // namespace graphics
+} // namespace anbox

src/anbox/graphics/program_family.h

@@ -0,0 +1,68 @@
+/*
+ * Copyright © 2015 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authored by: Daniel van Vugt <daniel.van.vugt@canonical.com>
+ */
+
+#ifndef ANBOX_GRAPHICS_PROGRAM_FAMILY_H_
+#define ANBOX_GRAPHICS_PROGRAM_FAMILY_H_
+
+#include <utility>
+#include <map>
+#include <unordered_map>
+
+#include <GLES2/gl2.h>
+
+namespace anbox {
+namespace graphics {
+/**
+ * ProgramFamily represents a set of GLSL programs that are closely
+ * related. Programs which point to the same shader source strings will be
+ * made to share the same compiled shader objects.
+ *   A secondary intention is that this class may be extended to allow the
+ * different programs within the family to share common patterns of uniform
+ * usage too.
+ */
+class ProgramFamily
+{
+public:
+    ProgramFamily() = default;
+    ProgramFamily(ProgramFamily const&) = delete;
+    ProgramFamily& operator=(ProgramFamily const&) = delete;
+    ~ProgramFamily() noexcept;
+
+    GLuint add_program(const GLchar* const static_vshader_src,
+                       const GLchar* const static_fshader_src);
+
+private:
+    struct Shader
+    {
+        GLuint id = 0;
+        void init(GLenum type, const GLchar* src);
+    };
+    typedef std::unordered_map<const GLchar*, Shader> ShaderMap;
+    ShaderMap vshader, fshader;
+
+    typedef std::pair<GLuint, GLuint> ShaderPair;
+    struct Program
+    {
+        GLuint id = 0;
+    };
+    std::map<ShaderPair, Program> program;
+};
+} // namespace graphics
+} // namespace anbox
+
+#endif // MIR_RENDERER_GL_PROGRAM_FAMILY_H_

src/anbox/wm/manager.cpp

@@ -19,6 +19,8 @@
 #include "anbox/wm/platform_policy.h"
 #include "anbox/logger.h"
 
+#include <algorithm>
+
 namespace anbox {
 namespace wm {
 Manager::Manager(const std::shared_ptr<PlatformPolicy> &platform) :
@@ -31,6 +33,8 @@ Manager::~Manager() {
 void Manager::apply_window_state_update(const WindowState::List &updated,
                                         const WindowState::List &removed)
 {
+    std::lock_guard<std::mutex> l(mutex_);
+
     DEBUG("updated %d removed %d", updated.size(), removed.size());
 
     // Base on the update we get from the Android WindowManagerService we will create
@@ -38,30 +42,46 @@ void Manager::apply_window_state_update(const WindowState::List &updated,
     // from SurfaceFlinger will be mapped later into those windows and eventually
     // composited there via GLES (e.g. for popups, ..)
 
-    for (const auto &window : updated) {
+    for (const auto &window : updated)
+    {
         auto w = windows_.find(window.task());
-        if (w != windows_.end()) {
-            DEBUG("Found existing window for task %d", window.task());
+        if (w != windows_.end())
+        {
             w->second->update_state(window);
             continue;
         }
-        DEBUG("Found new window for task %d", window.task());
         auto platform_window = platform_->create_window(window);
+        platform_window->ref();
         platform_window->attach();
         windows_.insert({window.task(), platform_window});
     }
 
-    for (const auto &window : removed) {
+    for (const auto &window : removed)
+    {
         auto w = windows_.find(window.task());
-        if (w == windows_.end()) {
-            WARNING("Got remove request for window we don't know about (task id %d)", window.task());
+        if (w == windows_.end())
             continue;
+
+        w->second->unref();
+        if (!w->second->still_used())
+        {
+            auto platform_window = w->second;
+            platform_window->release();
+            windows_.erase(w);
         }
-        DEBUG("Removing window for task %d", window.task());
-        auto platform_window = w->second;
-        platform_window->release();
-        windows_.erase(w);
     }
 }
+
+std::shared_ptr<Window> Manager::find_window_for_task(const Task::Id &task)
+{
+    std::lock_guard<std::mutex> l(mutex_);
+
+    for (const auto &w : windows_)
+    {
+        if (w.second->state().task() == task)
+            return w.second;
+    }
+    return nullptr;
+}
 } // namespace wm
 } // namespace anbox

src/anbox/wm/manager.h

@@ -23,6 +23,7 @@
 
 #include <memory>
 #include <map>
+#include <mutex>
 
 namespace anbox {
 namespace wm {
@@ -35,7 +36,10 @@ public:
     void apply_window_state_update(const WindowState::List &updated,
                                    const WindowState::List &removed);
 
+    std::shared_ptr<Window> find_window_for_task(const Task::Id &task);
+
 private:
+    std::mutex mutex_;
     std::shared_ptr<PlatformPolicy> platform_;
     std::map<Task::Id, std::shared_ptr<Window>> windows_;
 };

src/anbox/wm/window.cpp

@@ -17,18 +17,24 @@
 
 #include "anbox/wm/window.h"
 #include "anbox/graphics/emugl/Renderer.h"
+#include "anbox/logger.h"
 
 namespace anbox {
 namespace wm {
 Window::Window(const WindowState &state) :
-    state_(state) {
+    state_(state),
+    refcount_(0) {
 }
 
 Window::~Window() {
 }
 
-void Window::update_state(const WindowState &state) {
-    state_ = state;
+void Window::update_state(const WindowState &new_state) {
+    state_ = new_state;
+}
+
+WindowState Window::state() const {
+    return state_;
 }
 
 EGLNativeWindowType Window::native_handle() const {
@@ -42,6 +48,23 @@ bool Window::attach() {
 void Window::release() {
     Renderer::get()->destroyNativeWindow(native_handle());
 }
+
+void Window::ref() {
+    refcount_++;
+}
+
+void Window::unref() {
+    if (refcount_ == 0) {
+        WARNING("reference count is out of sync");
+        return;
+    }
+
+    refcount_--;
+}
+
+bool Window::still_used() const {
+    return refcount_ > 0;
+}
 } // namespace wm
 } // namespace anbox
 

src/anbox/wm/window.h

@@ -42,12 +42,16 @@ class Window
 public:
     typedef std::vector<Window> List;
 
-    Window(const WindowState &state);
+    Window(const WindowState &new_state);
     virtual ~Window();
 
     bool attach();
     void release();
 
+    void ref();
+    void unref();
+    bool still_used() const;
+
     void update_state(const WindowState &state);
 
     virtual EGLNativeWindowType native_handle() const;
@@ -55,6 +59,7 @@ public:
 
 private:
     WindowState state_;
+    std::uint32_t refcount_;
 };
 } // namespace wm
 } // namespace anbox