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      1 /*
      2  * Copyright 2017 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "fiddle_main.h"
      9 
     10 #include <EGL/egl.h>
     11 #include <GLES2/gl2.h>
     12 
     13 static const EGLint configAttribs[] = {
     14     EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
     15     EGL_BLUE_SIZE, 8,
     16     EGL_GREEN_SIZE, 8,
     17     EGL_RED_SIZE, 8,
     18     EGL_DEPTH_SIZE, 8,
     19     EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
     20     EGL_NONE
     21 };
     22 
     23 static const int pbufferWidth = 9;
     24 static const int pbufferHeight = 9;
     25 
     26 static const EGLint pbufferAttribs[] = {
     27     EGL_WIDTH, pbufferWidth,
     28     EGL_HEIGHT, pbufferHeight,
     29     EGL_NONE,
     30 };
     31 
     32 // create_grcontext implementation for EGL.
     33 sk_sp<GrContext> create_grcontext(std::ostringstream &driverinfo) {
     34     EGLDisplay eglDpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
     35     if (EGL_NO_DISPLAY == eglDpy) {
     36         return nullptr;
     37     }
     38 
     39     EGLint major, minor;
     40     if (EGL_TRUE != eglInitialize(eglDpy, &major, &minor)) {
     41         return nullptr;
     42     }
     43 
     44     EGLint numConfigs;
     45     EGLConfig eglCfg;
     46     if (EGL_TRUE != eglChooseConfig(eglDpy, configAttribs, &eglCfg, 1, &numConfigs)) {
     47         return nullptr;
     48     }
     49 
     50     EGLSurface eglSurf = eglCreatePbufferSurface(eglDpy, eglCfg, pbufferAttribs);
     51     if (EGL_NO_SURFACE == eglSurf) {
     52         return nullptr;
     53     }
     54 
     55     if (EGL_TRUE != eglBindAPI(EGL_OPENGL_API)) {
     56         return nullptr;
     57     }
     58 
     59     EGLContext eglCtx = eglCreateContext(eglDpy, eglCfg, EGL_NO_CONTEXT, NULL);
     60     if (EGL_NO_CONTEXT == eglCtx) {
     61         return nullptr;
     62     }
     63     if (EGL_FALSE == eglMakeCurrent(eglDpy, eglSurf, eglSurf, eglCtx)) {
     64         return nullptr;
     65     }
     66 
     67     driverinfo << "EGL " << major << "." << minor << "\n";
     68     GrGLGetStringProc getString = (GrGLGetStringProc )eglGetProcAddress("glGetString");
     69     driverinfo << "GL Versionr: " << getString(GL_VERSION) << "\n";
     70     driverinfo << "GL Vendor: " << getString(GL_VENDOR) << "\n";
     71     driverinfo << "GL Renderer: " << getString(GL_RENDERER) << "\n";
     72     driverinfo << "GL Extensions: " << getString(GL_EXTENSIONS) << "\n";
     73 
     74     auto interface = GrGLMakeNativeInterface();
     75     if (!interface) {
     76         return nullptr;
     77     }
     78     eglTerminate(eglDpy);
     79 
     80     return sk_sp<GrContext>(GrContext::MakeGL(interface));
     81 }
     82