am 3127d80b: Merge "opengles emulator: handle window surface resize"

* commit '3127d80bd8edaeeaa53663ab92e1e09825635527':
  opengles emulator: handle window surface resize

tools/emulator/opengl/host/libs/libOpenglRender/WindowSurface.cpp

@@ -34,6 +34,8 @@ WindowSurface::WindowSurface() :
     m_drawContext(NULL),
     m_width(0),
     m_height(0),
+    m_pbufWidth(0),
+    m_pbufHeight(0),
     m_useEGLImage(false),
     m_useBindToTexture(false)
 {
@@ -56,6 +58,7 @@ WindowSurface *WindowSurface::create(int p_config, int p_width, int p_height)
     if (!win) {
         return NULL;
     }
+    win->m_fbconf = fbconf;
 
     FrameBuffer *fb = FrameBuffer::getFB();
     const FrameBufferCaps &caps = fb->getCaps();
@@ -79,34 +82,7 @@ WindowSurface *WindowSurface::create(int p_config, int p_width, int p_height)
     if (win->m_useEGLImage) {
     }
     else if (0 != (fbconf->getSurfaceType() & EGL_PBUFFER_BIT)) {
-
+        if (!win->resizePbuffer(p_width, p_height)) {
-        //
-        // Use Pbuffer for the rendering surface, if possible
-        // set it such that it will be able to be bound to a texture
-        // later to prevent readback.
-        //
-        EGLint pbufAttribs[12];
-        pbufAttribs[0] = EGL_WIDTH;
-        pbufAttribs[1] = p_width;
-        pbufAttribs[2] = EGL_HEIGHT;
-        pbufAttribs[3] = p_height;
-
-        if (caps.has_BindToTexture) {
-            pbufAttribs[4] = EGL_TEXTURE_FORMAT;
-            pbufAttribs[5] = EGL_TEXTURE_RGBA;
-            pbufAttribs[6] = EGL_TEXTURE_TARGET;
-            pbufAttribs[7] = EGL_TEXTURE_2D;
-            pbufAttribs[8] = EGL_NONE;
-            win->m_useBindToTexture = true;
-        }
-        else {
-            pbufAttribs[4] = EGL_NONE;
-        }
-
-        win->m_eglSurface = s_egl.eglCreatePbufferSurface(fb->getDisplay(),
-                                                    fbconf->getEGLConfig(),
-                                                    pbufAttribs);
-        if (win->m_eglSurface == EGL_NO_SURFACE) {
             delete win;
             return NULL;
         }
@@ -156,6 +132,24 @@ void WindowSurface::flushColorBuffer()
 void WindowSurface::setColorBuffer(ColorBufferPtr p_colorBuffer)
 {
     m_attachedColorBuffer = p_colorBuffer;
+
+    //
+    // resize the window if the attached color buffer is of different
+    // size
+    //
+    unsigned int cbWidth = m_attachedColorBuffer->getWidth();
+    unsigned int cbHeight = m_attachedColorBuffer->getHeight();
+
+    if (cbWidth != m_width || cbHeight != m_height) {
+
+        if (m_pbufWidth && m_pbufHeight) {
+            // if we use pbuffer, need to resize it
+            resizePbuffer(cbWidth, cbHeight);
+        }
+
+        m_width = cbWidth;
+        m_height = cbHeight;
+    }
 }
 
 //
@@ -262,3 +256,81 @@ void WindowSurface::copyToColorBuffer()
                          prevReadSurf, prevContext);
 
 }
+
+bool WindowSurface::resizePbuffer(unsigned int p_width, unsigned int p_height)
+{
+    if (m_eglSurface && 
+        m_pbufWidth == p_width &&
+        m_pbufHeight == p_height) {
+        // no need to resize
+        return true;
+    }
+
+    FrameBuffer *fb = FrameBuffer::getFB();
+
+    EGLContext prevContext = s_egl.eglGetCurrentContext();
+    EGLSurface prevReadSurf = s_egl.eglGetCurrentSurface(EGL_READ);
+    EGLSurface prevDrawSurf = s_egl.eglGetCurrentSurface(EGL_DRAW);
+    EGLSurface prevPbuf = m_eglSurface;
+    bool needRebindContext = m_eglSurface &&
+                             (prevReadSurf == m_eglSurface ||
+                              prevDrawSurf == m_eglSurface);
+
+    if (needRebindContext) {
+        s_egl.eglMakeCurrent(fb->getDisplay(), EGL_NO_SURFACE,
+                              EGL_NO_SURFACE, EGL_NO_CONTEXT);
+    }
+
+    //
+    // Destroy previous surface
+    //
+    if (m_eglSurface) {
+        s_egl.eglDestroySurface(fb->getDisplay(), m_eglSurface);
+        m_eglSurface = NULL;
+    }
+
+    const FrameBufferCaps &caps = fb->getCaps();
+
+    //
+    // Create pbuffer surface, if possible
+    // set it such that it will be able to be bound to a texture
+    // later to prevent readback.
+    //
+    EGLint pbufAttribs[12];
+    pbufAttribs[0] = EGL_WIDTH;
+    pbufAttribs[1] = p_width;
+    pbufAttribs[2] = EGL_HEIGHT;
+    pbufAttribs[3] = p_height;
+
+    if (caps.has_BindToTexture) {
+        pbufAttribs[4] = EGL_TEXTURE_FORMAT;
+        pbufAttribs[5] = EGL_TEXTURE_RGBA;
+        pbufAttribs[6] = EGL_TEXTURE_TARGET;
+        pbufAttribs[7] = EGL_TEXTURE_2D;
+        pbufAttribs[8] = EGL_NONE;
+        m_useBindToTexture = true;
+    }
+    else {
+        pbufAttribs[4] = EGL_NONE;
+    }
+
+    m_eglSurface = s_egl.eglCreatePbufferSurface(fb->getDisplay(),
+                                                 m_fbconf->getEGLConfig(),
+                                                 pbufAttribs);
+    if (m_eglSurface == EGL_NO_SURFACE) {
+        fprintf(stderr, "Renderer error: failed to create/resize pbuffer!!\n");
+        return false;
+    }
+
+    m_pbufWidth = p_width;
+    m_pbufHeight = p_height;
+
+    if (needRebindContext) {
+        s_egl.eglMakeCurrent(fb->getDisplay(), 
+                     (prevDrawSurf==prevPbuf) ? m_eglSurface : prevDrawSurf,
+                     (prevReadSurf==prevPbuf) ? m_eglSurface : prevReadSurf,
+                     prevContext);
+    }
+
+    return true;
+}

tools/emulator/opengl/host/libs/libOpenglRender/WindowSurface.h

@@ -18,6 +18,7 @@
 
 #include "ColorBuffer.h"
 #include "RenderContext.h"
+#include "FBConfig.h"
 #include "SmartPtr.h"
 #include "FixedBuffer.h"
 #include <EGL/egl.h>
@@ -44,6 +45,7 @@ private:
     WindowSurface();
 
     void copyToColorBuffer();  // copy pbuffer content with readback+download
+    bool resizePbuffer(unsigned int p_width, unsigned int p_height);
 
 private:
     GLuint m_fbObj;   // GLES Framebuffer object (when EGLimage is used)
@@ -55,10 +57,13 @@ private:
     RenderContextPtr m_drawContext;
     GLuint m_width;
     GLuint m_height;
+    GLuint m_pbufWidth;
+    GLuint m_pbufHeight;
     bool m_useEGLImage;
     bool m_useBindToTexture;
     FixedBuffer m_xferBuffer;
     FixedBuffer m_xUpdateBuf;
+    const FBConfig *m_fbconf;
 };
 
 typedef SmartPtr<WindowSurface> WindowSurfacePtr;