text: /** @file
   *
   * VBox frontends: Qt GUI ("VirtualBox"):
   * OpenGL support info used for 2D support detection
   */
  
  /*
   * Copyright (C) 2009-2015 Oracle Corporation
   *
   * This file is part of VirtualBox Open Source Edition (OSE), as
   * available from http://www.virtualbox.org. This file is free software;
   * you can redistribute it and/or modify it under the terms of the GNU
   * General Public License (GPL) as published by the Free Software
   * Foundation, in version 2 as it comes in the "COPYING" file of the
   * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
   * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
   *
   * The contents of this file may alternatively be used under the terms
   * of the Common Development and Distribution License Version 1.0
   * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
   * VirtualBox OSE distribution, in which case the provisions of the
   * CDDL are applicable instead of those of the GPL.
   *
   * You may elect to license modified versions of this file under the
   * terms and conditions of either the GPL or the CDDL or both.
   */
  #ifndef __VBoxGLSupportInfo_h__
  #define __VBoxGLSupportInfo_h__
  
  #include <iprt/types.h>
  
  typedef char GLchar;
  
  #ifndef GL_COMPILE_STATUS
  # define GL_COMPILE_STATUS 0x8b81
  #endif
  #ifndef GL_LINK_STATUS
  # define GL_LINK_STATUS    0x8b82
  #endif
  #ifndef GL_FRAGMENT_SHADER
  # define GL_FRAGMENT_SHADER 0x8b30
  #endif
  #ifndef GL_VERTEX_SHADER
  # define GL_VERTEX_SHADER 0x8b31
  #endif
  
  /* GL_ARB_multitexture */
  #ifndef GL_TEXTURE0
  # define GL_TEXTURE0                    0x84c0
  #endif
  #ifndef GL_TEXTURE1
  # define GL_TEXTURE1                    0x84c1
  #endif
  #ifndef GL_MAX_TEXTURE_COORDS
  # define GL_MAX_TEXTURE_COORDS          0x8871
  #endif
  #ifndef GL_MAX_TEXTURE_IMAGE_UNITS
  # define GL_MAX_TEXTURE_IMAGE_UNITS     0x8872
  #endif
  
  #ifndef APIENTRY
  # define APIENTRY
  #endif
  
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_ACTIVE_TEXTURE) (GLenum texture);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_MULTI_TEX_COORD2I) (GLenum texture, GLint v0, GLint v1);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_MULTI_TEX_COORD2F) (GLenum texture, GLfloat v0, GLfloat v1);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_MULTI_TEX_COORD2D) (GLenum texture, GLdouble v0, GLdouble v1);
  
  /* GL_ARB_texture_rectangle */
  #ifndef GL_TEXTURE_RECTANGLE
  # define GL_TEXTURE_RECTANGLE 0x84F5
  #endif
  
  /* GL_ARB_shader_objects */
  /* GL_ARB_fragment_shader */
  
  typedef GLuint (APIENTRY *PFNVBOXVHWA_CREATE_SHADER)  (GLenum type);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_SHADER_SOURCE)  (GLuint shader, GLsizei count, const GLchar **string, const GLint *length);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_COMPILE_SHADER) (GLuint shader);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_DELETE_SHADER)  (GLuint shader);
  
  typedef GLuint (APIENTRY *PFNVBOXVHWA_CREATE_PROGRAM) ();
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_ATTACH_SHADER)  (GLuint program, GLuint shader);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_DETACH_SHADER)  (GLuint program, GLuint shader);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_LINK_PROGRAM)   (GLuint program);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_USE_PROGRAM)    (GLuint program);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_DELETE_PROGRAM) (GLuint program);
  
  typedef GLboolean (APIENTRY *PFNVBOXVHWA_IS_SHADER)   (GLuint shader);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_GET_SHADERIV)   (GLuint shader, GLenum pname, GLint *params);
  typedef GLboolean (APIENTRY *PFNVBOXVHWA_IS_PROGRAM)  (GLuint program);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_GET_PROGRAMIV)  (GLuint program, GLenum pname, GLint *params);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_GET_ATTACHED_SHADERS) (GLuint program, GLsizei maxCount, GLsizei *count, GLuint *shaders);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_GET_SHADER_INFO_LOG)  (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_GET_PROGRAM_INFO_LOG) (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
  typedef GLint (APIENTRY *PFNVBOXVHWA_GET_UNIFORM_LOCATION) (GLint programObj, const GLchar *name);
  
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_UNIFORM1F)(GLint location, GLfloat v0);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_UNIFORM2F)(GLint location, GLfloat v0, GLfloat v1);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_UNIFORM3F)(GLint location, GLfloat v0, GLfloat v1, GLfloat v2);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_UNIFORM4F)(GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3);
  
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_UNIFORM1I)(GLint location, GLint v0);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_UNIFORM2I)(GLint location, GLint v0, GLint v1);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_UNIFORM3I)(GLint location, GLint v0, GLint v1, GLint v2);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_UNIFORM4I)(GLint location, GLint v0, GLint v1, GLint v2, GLint v3);
  
  /* GL_ARB_pixel_buffer_object*/
  #ifndef Q_WS_MAC
  /* apears to be defined on mac */
  typedef ptrdiff_t GLsizeiptr;
  #endif
  
  #ifndef GL_READ_ONLY
  # define GL_READ_ONLY                   0x88B8
  #endif
  #ifndef GL_WRITE_ONLY
  # define GL_WRITE_ONLY                  0x88B9
  #endif
  #ifndef GL_READ_WRITE
  # define GL_READ_WRITE                  0x88BA
  #endif
  #ifndef GL_STREAM_DRAW
  # define GL_STREAM_DRAW                 0x88E0
  #endif
  #ifndef GL_STREAM_READ
  # define GL_STREAM_READ                 0x88E1
  #endif
  #ifndef GL_STREAM_COPY
  # define GL_STREAM_COPY                 0x88E2
  #endif
  #ifndef GL_DYNAMIC_DRAW
  # define GL_DYNAMIC_DRAW                0x88E8
  #endif
  
  #ifndef GL_PIXEL_PACK_BUFFER
  # define GL_PIXEL_PACK_BUFFER           0x88EB
  #endif
  #ifndef GL_PIXEL_UNPACK_BUFFER
  # define GL_PIXEL_UNPACK_BUFFER         0x88EC
  #endif
  #ifndef GL_PIXEL_PACK_BUFFER_BINDING
  # define GL_PIXEL_PACK_BUFFER_BINDING   0x88ED
  #endif
  #ifndef GL_PIXEL_UNPACK_BUFFER_BINDING
  # define GL_PIXEL_UNPACK_BUFFER_BINDING 0x88EF
  #endif
  
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_GEN_BUFFERS)(GLsizei n, GLuint *buffers);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_DELETE_BUFFERS)(GLsizei n, const GLuint *buffers);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_BIND_BUFFER)(GLenum target, GLuint buffer);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_BUFFER_DATA)(GLenum target, GLsizeiptr size, const GLvoid *data, GLenum usage);
  typedef GLvoid* (APIENTRY *PFNVBOXVHWA_MAP_BUFFER)(GLenum target, GLenum access);
  typedef GLboolean (APIENTRY *PFNVBOXVHWA_UNMAP_BUFFER)(GLenum target);
  
  /* GL_EXT_framebuffer_object */
  #ifndef GL_FRAMEBUFFER
  # define GL_FRAMEBUFFER                0x8D40
  #endif
  #ifndef GL_COLOR_ATTACHMENT0
  # define GL_COLOR_ATTACHMENT0          0x8CE0
  #endif
  
  typedef GLboolean (APIENTRY *PFNVBOXVHWA_IS_FRAMEBUFFER)(GLuint framebuffer);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_BIND_FRAMEBUFFER)(GLenum target, GLuint framebuffer);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_DELETE_FRAMEBUFFERS)(GLsizei n, const GLuint *framebuffers);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_GEN_FRAMEBUFFERS)(GLsizei n, GLuint *framebuffers);
  typedef GLenum (APIENTRY *PFNVBOXVHWA_CHECK_FRAMEBUFFER_STATUS)(GLenum target);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_FRAMEBUFFER_TEXTURE1D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_FRAMEBUFFER_TEXTURE2D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_FRAMEBUFFER_TEXTURE3D)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level, GLint zoffset);
  typedef GLvoid (APIENTRY *PFNVBOXVHWA_GET_FRAMEBUFFER_ATTACHMENT_PARAMETRIV)(GLenum target, GLenum attachment, GLenum pname, GLint *params);
  
  
  /*****************/
  
  /* functions */
  
  /* @todo: move those to VBoxGLInfo class instance members ??? */
  extern PFNVBOXVHWA_ACTIVE_TEXTURE vboxglActiveTexture;
  extern PFNVBOXVHWA_MULTI_TEX_COORD2I vboxglMultiTexCoord2i;
  extern PFNVBOXVHWA_MULTI_TEX_COORD2D vboxglMultiTexCoord2d;
  extern PFNVBOXVHWA_MULTI_TEX_COORD2F vboxglMultiTexCoord2f;
  
  
  extern PFNVBOXVHWA_CREATE_SHADER   vboxglCreateShader;
  extern PFNVBOXVHWA_SHADER_SOURCE   vboxglShaderSource;
  extern PFNVBOXVHWA_COMPILE_SHADER  vboxglCompileShader;
  extern PFNVBOXVHWA_DELETE_SHADER   vboxglDeleteShader;
  
  extern PFNVBOXVHWA_CREATE_PROGRAM  vboxglCreateProgram;
  extern PFNVBOXVHWA_ATTACH_SHADER   vboxglAttachShader;
  extern PFNVBOXVHWA_DETACH_SHADER   vboxglDetachShader;
  extern PFNVBOXVHWA_LINK_PROGRAM    vboxglLinkProgram;
  extern PFNVBOXVHWA_USE_PROGRAM     vboxglUseProgram;
  extern PFNVBOXVHWA_DELETE_PROGRAM  vboxglDeleteProgram;
  
  extern PFNVBOXVHWA_IS_SHADER       vboxglIsShader;
  extern PFNVBOXVHWA_GET_SHADERIV    vboxglGetShaderiv;
  extern PFNVBOXVHWA_IS_PROGRAM      vboxglIsProgram;
  extern PFNVBOXVHWA_GET_PROGRAMIV   vboxglGetProgramiv;
  extern PFNVBOXVHWA_GET_ATTACHED_SHADERS vboxglGetAttachedShaders;
  extern PFNVBOXVHWA_GET_SHADER_INFO_LOG  vboxglGetShaderInfoLog;
  extern PFNVBOXVHWA_GET_PROGRAM_INFO_LOG vboxglGetProgramInfoLog;
  
  extern PFNVBOXVHWA_GET_UNIFORM_LOCATION vboxglGetUniformLocation;
  
  extern PFNVBOXVHWA_UNIFORM1F vboxglUniform1f;
  extern PFNVBOXVHWA_UNIFORM2F vboxglUniform2f;
  extern PFNVBOXVHWA_UNIFORM3F vboxglUniform3f;
  extern PFNVBOXVHWA_UNIFORM4F vboxglUniform4f;
  
  extern PFNVBOXVHWA_UNIFORM1I vboxglUniform1i;
  extern PFNVBOXVHWA_UNIFORM2I vboxglUniform2i;
  extern PFNVBOXVHWA_UNIFORM3I vboxglUniform3i;
  extern PFNVBOXVHWA_UNIFORM4I vboxglUniform4i;
  
  extern PFNVBOXVHWA_GEN_BUFFERS vboxglGenBuffers;
  extern PFNVBOXVHWA_DELETE_BUFFERS vboxglDeleteBuffers;
  extern PFNVBOXVHWA_BIND_BUFFER vboxglBindBuffer;
  extern PFNVBOXVHWA_BUFFER_DATA vboxglBufferData;
  extern PFNVBOXVHWA_MAP_BUFFER vboxglMapBuffer;
  extern PFNVBOXVHWA_UNMAP_BUFFER vboxglUnmapBuffer;
  
  extern PFNVBOXVHWA_IS_FRAMEBUFFER vboxglIsFramebuffer;
  extern PFNVBOXVHWA_BIND_FRAMEBUFFER vboxglBindFramebuffer;
  extern PFNVBOXVHWA_DELETE_FRAMEBUFFERS vboxglDeleteFramebuffers;
  extern PFNVBOXVHWA_GEN_FRAMEBUFFERS vboxglGenFramebuffers;
  extern PFNVBOXVHWA_CHECK_FRAMEBUFFER_STATUS vboxglCheckFramebufferStatus;
  extern PFNVBOXVHWA_FRAMEBUFFER_TEXTURE1D vboxglFramebufferTexture1D;
  extern PFNVBOXVHWA_FRAMEBUFFER_TEXTURE2D vboxglFramebufferTexture2D;
  extern PFNVBOXVHWA_FRAMEBUFFER_TEXTURE3D vboxglFramebufferTexture3D;
  extern PFNVBOXVHWA_GET_FRAMEBUFFER_ATTACHMENT_PARAMETRIV vboxglGetFramebufferAttachmentParameteriv;
  
  
  class VBoxGLInfo
  {
  public:
      VBoxGLInfo() :
          mGLVersion(0),
          mFragmentShaderSupported(false),
          mTextureRectangleSupported(false),
          mTextureNP2Supported(false),
          mPBOSupported(false),
          mFBOSupported(false),
          mMultiTexNumSupported(1), /* 1 would mean it is not supported */
          m_GL_ARB_multitexture(false),
          m_GL_ARB_shader_objects(false),
          m_GL_ARB_fragment_shader(false),
          m_GL_ARB_pixel_buffer_object(false),
          m_GL_ARB_texture_rectangle(false),
          m_GL_EXT_texture_rectangle(false),
          m_GL_NV_texture_rectangle(false),
          m_GL_ARB_texture_non_power_of_two(false),
          m_GL_EXT_framebuffer_object(false),
          mInitialized(false)
      {}
  
      void init(const class QGLContext * pContext);
  
      bool isInitialized() const { return mInitialized; }
  
      int getGLVersion() const { return mGLVersion; }
      bool isFragmentShaderSupported() const { return mFragmentShaderSupported; }
      bool isTextureRectangleSupported() const { return mTextureRectangleSupported; }
      bool isTextureNP2Supported() const { return mTextureNP2Supported; }
      bool isPBOSupported() const { return mPBOSupported; }
      /* some ATI drivers do not seem to support non-zero offsets when dealing with PBOs
       * @todo: add a check for that, always unsupported currently */
      bool isPBOOffsetSupported() const { return false; }
      bool isFBOSupported() const { return mFBOSupported; }
      /* 1 would mean it is not supported */
      int getMultiTexNumSupported() const { return mMultiTexNumSupported; }
  
      static int parseVersion(const GLubyte * ver);
  private:
      void initExtSupport(const class QGLContext & context);
  
      int mGLVersion;
      bool mFragmentShaderSupported;
      bool mTextureRectangleSupported;
      bool mTextureNP2Supported;
      bool mPBOSupported;
      bool mFBOSupported;
      int mMultiTexNumSupported; /* 1 would mean it is not supported */
  
      bool m_GL_ARB_multitexture;
      bool m_GL_ARB_shader_objects;
      bool m_GL_ARB_fragment_shader;
      bool m_GL_ARB_pixel_buffer_object;
      bool m_GL_ARB_texture_rectangle;
      bool m_GL_EXT_texture_rectangle;
      bool m_GL_NV_texture_rectangle;
      bool m_GL_ARB_texture_non_power_of_two;
      bool m_GL_EXT_framebuffer_object;
  
      bool mInitialized;
  };
  
  class VBoxGLTmpContext
  {
  public:
      VBoxGLTmpContext();
      ~VBoxGLTmpContext();
  
      const class QGLContext * makeCurrent();
  private:
      class QGLWidget * mWidget;
  };
  
  
  #define VBOXQGL_MAKEFOURCC(ch0, ch1, ch2, ch3)                              \
                  ((uint32_t)(uint8_t)(ch0) | ((uint32_t)(uint8_t)(ch1) << 8) |       \
                  ((uint32_t)(uint8_t)(ch2) << 16) | ((uint32_t)(uint8_t)(ch3) << 24 ))
  
  #define FOURCC_AYUV VBOXQGL_MAKEFOURCC('A', 'Y', 'U', 'V')
  #define FOURCC_UYVY VBOXQGL_MAKEFOURCC('U', 'Y', 'V', 'Y')
  #define FOURCC_YUY2 VBOXQGL_MAKEFOURCC('Y', 'U', 'Y', '2')
  #define FOURCC_YV12 VBOXQGL_MAKEFOURCC('Y', 'V', '1', '2')
  #define VBOXVHWA_NUMFOURCC 4
  
  class VBoxVHWAInfo
  {
  public:
      VBoxVHWAInfo() :
          mFourccSupportedCount(0),
          mInitialized(false)
      {}
  
      VBoxVHWAInfo(const VBoxGLInfo & glInfo) :
          mglInfo(glInfo),
          mFourccSupportedCount(0),
          mInitialized(false)
      {}
  
      void init(const class QGLContext * pContext);
  
      bool isInitialized() const { return mInitialized; }
  
      const VBoxGLInfo & getGlInfo() const { return mglInfo; }
  
      bool isVHWASupported() const;
  
      int getFourccSupportedCount() const { return mFourccSupportedCount; }
      const uint32_t * getFourccSupportedList() const { return mFourccSupportedList; }
  
      static bool checkVHWASupport();
  private:
      VBoxGLInfo mglInfo;
      uint32_t mFourccSupportedList[VBOXVHWA_NUMFOURCC];
      int mFourccSupportedCount;
  
      bool mInitialized;
  };
  
  #endif /* #ifndef __VBoxGLSupportInfo_h__ */
  