src/gpu/gles2_conform_support/native/egl_native_x11.cc

   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"