Make the Sk GL context class an abstract base class

src/gpu/gl/glx/SkNativeGLContext_glx.cpp

Index: src/gpu/gl/glx/SkNativeGLContext_glx.cpp
diff --git a/src/gpu/gl/glx/SkNativeGLContext_glx.cpp b/src/gpu/gl/glx/SkNativeGLContext_glx.cpp
deleted file mode 100644
index bd130b545cd9af62de9002dfbc6aef2f0e4b85da..0000000000000000000000000000000000000000
--- a/src/gpu/gl/glx/SkNativeGLContext_glx.cpp
+++ /dev/null
@@ -1,288 +0,0 @@
-
-/*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "gl/SkNativeGLContext.h"
-
-#include <GL/glu.h>
-
-/* Note: Skia requires glx 1.3 or newer */
-
-SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
-    fOldGLXContext = glXGetCurrentContext();
-    fOldDisplay = glXGetCurrentDisplay();
-    fOldDrawable = glXGetCurrentDrawable();
-}
-
-SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
-    if (fOldDisplay) {
-        glXMakeCurrent(fOldDisplay, fOldDrawable, fOldGLXContext);
-    }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-static bool ctxErrorOccurred = false;
-static int ctxErrorHandler(Display *dpy, XErrorEvent *ev) {
-    ctxErrorOccurred = true;
-    return 0;
-}
-
-SkNativeGLContext::SkNativeGLContext()
-    : fContext(NULL)
-    , fDisplay(NULL)
-    , fPixmap(0)
-    , fGlxPixmap(0) {
-}
-
-SkNativeGLContext::~SkNativeGLContext() {
-    this->destroyGLContext();
-}
-
-void SkNativeGLContext::destroyGLContext() {
-    if (fDisplay) {
-        glXMakeCurrent(fDisplay, 0, 0);
-
-        if (fContext) {
-            glXDestroyContext(fDisplay, fContext);
-            fContext = NULL;
-        }
-
-        if (fGlxPixmap) {
-            glXDestroyGLXPixmap(fDisplay, fGlxPixmap);
-            fGlxPixmap = 0;
-        }
-
-        if (fPixmap) {
-            XFreePixmap(fDisplay, fPixmap);
-            fPixmap = 0;
-        }
-
-        XCloseDisplay(fDisplay);
-        fDisplay = NULL;
-    }
-}
-
-const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
-    fDisplay = XOpenDisplay(0);
-
-    if (!fDisplay) {
-        SkDebugf("Failed to open X display.\n");
-        this->destroyGLContext();
-        return NULL;
-    }
-
-    // Get a matching FB config
-    static int visual_attribs[] = {
-        GLX_X_RENDERABLE    , True,
-        GLX_DRAWABLE_TYPE   , GLX_PIXMAP_BIT,
-        None
-    };
-
-    int glx_major, glx_minor;
-
-    // FBConfigs were added in GLX version 1.3.
-    if (!glXQueryVersion(fDisplay, &glx_major, &glx_minor) ||
-            ((glx_major == 1) && (glx_minor < 3)) || (glx_major < 1)) {
-        SkDebugf("GLX version 1.3 or higher required.\n");
-        this->destroyGLContext();
-        return NULL;
-    }
-
-    //SkDebugf("Getting matching framebuffer configs.\n");
-    int fbcount;
-    GLXFBConfig *fbc = glXChooseFBConfig(fDisplay, DefaultScreen(fDisplay),
-                                          visual_attribs, &fbcount);
-    if (!fbc) {
-        SkDebugf("Failed to retrieve a framebuffer config.\n");
-        this->destroyGLContext();
-        return NULL;
-    }
-    //SkDebugf("Found %d matching FB configs.\n", fbcount);
-
-    // Pick the FB config/visual with the most samples per pixel
-    //SkDebugf("Getting XVisualInfos.\n");
-    int best_fbc = -1, best_num_samp = -1;
-
-    int i;
-    for (i = 0; i < fbcount; ++i) {
-        XVisualInfo *vi = glXGetVisualFromFBConfig(fDisplay, fbc[i]);
-        if (vi) {
-            int samp_buf, samples;
-            glXGetFBConfigAttrib(fDisplay, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf);
-            glXGetFBConfigAttrib(fDisplay, fbc[i], GLX_SAMPLES, &samples);
-
-            //SkDebugf("  Matching fbconfig %d, visual ID 0x%2x: SAMPLE_BUFFERS = %d,"
-            //       " SAMPLES = %d\n",
-            //        i, (unsigned int)vi->visualid, samp_buf, samples);
-
-            if (best_fbc < 0 || (samp_buf && samples > best_num_samp))
-                best_fbc = i, best_num_samp = samples;
-        }
-        XFree(vi);
-    }
-
-    GLXFBConfig bestFbc = fbc[best_fbc];
-
-    // Be sure to free the FBConfig list allocated by glXChooseFBConfig()
-    XFree(fbc);
-
-    // Get a visual
-    XVisualInfo *vi = glXGetVisualFromFBConfig(fDisplay, bestFbc);
-    //SkDebugf("Chosen visual ID = 0x%x\n", (unsigned int)vi->visualid);
-
-    fPixmap = XCreatePixmap(fDisplay, RootWindow(fDisplay, vi->screen), 10, 10, vi->depth);
-
-    if (!fPixmap) {
-        SkDebugf("Failed to create pixmap.\n");
-        this->destroyGLContext();
-        return NULL;
-    }
-
-    fGlxPixmap = glXCreateGLXPixmap(fDisplay, vi, fPixmap);
-
-    // Done with the visual info data
-    XFree(vi);
-
-    // Create the context
-
-    // Install an X error handler so the application won't exit if GL 3.0
-    // context allocation fails.
-    //
-    // Note this error handler is global.
-    // All display connections in all threads of a process use the same
-    // error handler, so be sure to guard against other threads issuing
-    // X commands while this code is running.
-    ctxErrorOccurred = false;
-    int (*oldHandler)(Display*, XErrorEvent*) =
-        XSetErrorHandler(&ctxErrorHandler);
-
-    // Get the default screen's GLX extension list
-    const char *glxExts = glXQueryExtensionsString(
-        fDisplay, DefaultScreen(fDisplay)
-    );
-
-
-    // Check for the GLX_ARB_create_context extension string and the function.
-    // If either is not present, use GLX 1.3 context creation method.
-    if (!gluCheckExtension(reinterpret_cast<const GLubyte*>("GLX_ARB_create_context"),
-                           reinterpret_cast<const GLubyte*>(glxExts))) {
-        if (kGLES_GrGLStandard != forcedGpuAPI) {
-            fContext = glXCreateNewContext(fDisplay, bestFbc, GLX_RGBA_TYPE, 0, True);
-        }
-    } else {
-        //SkDebugf("Creating context.\n");
-        PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB =
-            (PFNGLXCREATECONTEXTATTRIBSARBPROC) glXGetProcAddressARB((GrGLubyte*)"glXCreateContextAttribsARB");
-
-        if (kGLES_GrGLStandard == forcedGpuAPI) {
-            if (gluCheckExtension(
-                    reinterpret_cast<const GLubyte*>("GLX_EXT_create_context_es2_profile"),
-                    reinterpret_cast<const GLubyte*>(glxExts))) {
-                static const int context_attribs_gles[] = {
-                    GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
-                    GLX_CONTEXT_MINOR_VERSION_ARB, 0,
-                    GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
-                    None
-                };
-                fContext = glXCreateContextAttribsARB(fDisplay, bestFbc, 0, True,
-                                                      context_attribs_gles);
-            }
-        } else {
-            // Well, unfortunately GLX will not just give us the highest context so instead we have
-            // to do this nastiness
-            for (i = NUM_GL_VERSIONS - 2; i > 0 ; i--) {
-                /* don't bother below GL 3.0 */
-                if (gl_versions[i].major == 3 && gl_versions[i].minor == 0) {
-                    break;
-                }
-                // On Nvidia GPUs, to use Nv Path rendering we need a compatibility profile for the
-                // time being.
-                // TODO when Nvidia implements NVPR on Core profiles, we should start requesting
-                // core here
-                static const int context_attribs_gl[] = {
-                      GLX_CONTEXT_MAJOR_VERSION_ARB, gl_versions[i].major,
-                      GLX_CONTEXT_MINOR_VERSION_ARB, gl_versions[i].minor,
-                      GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
-                      None
-                };
-                fContext =
-                        glXCreateContextAttribsARB(fDisplay, bestFbc, 0, True, context_attribs_gl);
-
-                // Sync to ensure any errors generated are processed.
-                XSync(fDisplay, False);
-
-                if (!ctxErrorOccurred && fContext) {
-                    break;
-                }
-                // try again
-                ctxErrorOccurred = false;
-            }
-
-            // Couldn't create GL 3.0 context.
-            // Fall back to old-style 2.x context.
-            // When a context version below 3.0 is requested,
-            // implementations will return the newest context version
-            // compatible with OpenGL versions less than version 3.0.
-            if (ctxErrorOccurred || !fContext) {
-                static const int context_attribs_gl_fallback[] = {
-                    GLX_CONTEXT_MAJOR_VERSION_ARB, 1,
-                    GLX_CONTEXT_MINOR_VERSION_ARB, 0,
-                    None
-                };
-
-                ctxErrorOccurred = false;
-
-                fContext = glXCreateContextAttribsARB(fDisplay, bestFbc, 0, True,
-                                                      context_attribs_gl_fallback);
-            }
-        }
-    }
-
-    // Sync to ensure any errors generated are processed.
-    XSync(fDisplay, False);
-
-    // Restore the original error handler
-    XSetErrorHandler(oldHandler);
-
-    if (ctxErrorOccurred || !fContext) {
-        SkDebugf("Failed to create an OpenGL context.\n");
-        this->destroyGLContext();
-        return NULL;
-    }
-
-    // Verify that context is a direct context
-    if (!glXIsDirect(fDisplay, fContext)) {
-        //SkDebugf("Indirect GLX rendering context obtained.\n");
-    } else {
-        //SkDebugf("Direct GLX rendering context obtained.\n");
-    }
-
-    //SkDebugf("Making context current.\n");
-    if (!glXMakeCurrent(fDisplay, fGlxPixmap, fContext)) {
-      SkDebugf("Could not set the context.\n");
-        this->destroyGLContext();
-        return NULL;
-    }
-
-    const GrGLInterface* interface = GrGLCreateNativeInterface();
-    if (!interface) {
-        SkDebugf("Failed to create gl interface");
-        this->destroyGLContext();
-        return NULL;
-    }
-    return interface;
-}
-
-void SkNativeGLContext::makeCurrent() const {
-    if (!glXMakeCurrent(fDisplay, fGlxPixmap, fContext)) {
-        SkDebugf("Could not set the context.\n");
-    }
-}
-
-void SkNativeGLContext::swapBuffers() const {
-    glXSwapBuffers(fDisplay, fGlxPixmap);
-}