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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include <EGL/egl.h>
      6 #include <EGL/eglext.h>
      7 
      8 extern "C" {
      9 #if defined(GLES2_CONFORM_SUPPORT_ONLY)
     10 #include "gpu/gles2_conform_support/gtf/gtf_stubs.h"
     11 #else
     12 #include "third_party/gles2_conform/GTF_ES/glsl/GTF/Source/eglNative.h"
     13 #endif
     14 
     15 EGLImageKHR GTFCreateEGLImage(int width, int height,
     16                               GLenum format, GLenum type) {
     17   PFNEGLCREATEIMAGEKHRPROC egl_create_image_khr_;
     18   egl_create_image_khr_ = reinterpret_cast<PFNEGLCREATEIMAGEKHRPROC>
     19                             (eglGetProcAddress("eglCreateImageKHR"));
     20 
     21   static const EGLint attrib[] = {
     22     EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
     23     EGL_GL_TEXTURE_LEVEL_KHR, 0,
     24     EGL_NONE
     25   };
     26 
     27   if (format != GL_RGBA && format != GL_RGB)
     28     return static_cast<EGLImageKHR>(NULL);
     29 
     30   if (type != GL_UNSIGNED_BYTE)
     31     return static_cast<EGLImageKHR>(NULL);
     32 
     33   GLuint texture;
     34   glGenTextures(1, &texture);
     35   glBindTexture(GL_TEXTURE_2D, texture);
     36   glTexImage2D(GL_TEXTURE_2D,
     37                0,
     38                format,
     39                width,
     40                height,
     41                0,
     42                format,
     43                type,
     44                NULL);
     45 
     46   // Disable mip-maps because we do not require it.
     47   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     48   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     49 
     50   if(glGetError() != GL_NO_ERROR)
     51     return static_cast<EGLImageKHR>(NULL);
     52 
     53   EGLImageKHR egl_image =
     54       egl_create_image_khr_(eglGetCurrentDisplay(),
     55                             eglGetCurrentContext(),
     56                             EGL_GL_TEXTURE_2D_KHR,
     57                             reinterpret_cast<EGLClientBuffer>(texture),
     58                             attrib);
     59 
     60   if (eglGetError() == EGL_SUCCESS)
     61     return egl_image;
     62   else
     63     return static_cast<EGLImageKHR>(NULL);
     64 }
     65 
     66 void GTFDestroyEGLImage(EGLImageKHR image) {
     67   PFNEGLDESTROYIMAGEKHRPROC egl_destroy_image_khr_;
     68   egl_destroy_image_khr_ = reinterpret_cast<PFNEGLDESTROYIMAGEKHRPROC>
     69                              (eglGetProcAddress("eglDestroyImageKHR"));
     70 
     71   egl_destroy_image_khr_(eglGetCurrentDisplay(), image);
     72 }
     73 
     74 }  // extern "C"
     75