dd.h

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/**
 * \file dd.h
 * Device driver interfaces.
 */

/*
 * Mesa 3-D graphics library
 * Version:  6.5
 *
 * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


#ifndef DD_INCLUDED
#define DD_INCLUDED

/* THIS FILE ONLY INCLUDED BY mtypes.h !!!!! */

struct gl_pixelstore_attrib;
struct mesa_display_list;

/**
 * Device driver function table.
 * Core Mesa uses these function pointers to call into device drivers.
 * Most of these functions directly correspond to OpenGL state commands.
 * Core Mesa will call these functions after error checking has been done
 * so that the drivers don't have to worry about error testing.
 *
 * Vertex transformation/clipping/lighting is patched into the T&L module.
 * Rasterization functions are patched into the swrast module.
 *
 * Note: when new functions are added here, the drivers/common/driverfuncs.c
 * file should be updated too!!!
 */
struct dd_function_table {
   /**
    * Return a string as needed by glGetString().
    *
    * Only the GL_RENDERER token must be implemented.  Otherwise, NULL can be
    * returned.
    */
   const GLubyte * (*GetString)( GLcontext *ctx, GLenum name );

   /**
    * Notify the driver after Mesa has made some internal state changes.  
    *
    * This is in addition to any state change callbacks Mesa may already have
    * made.
    */
   void (*UpdateState)( GLcontext *ctx, GLbitfield new_state );

   /**
    * Get the width and height of the named buffer/window.
    *
    * Mesa uses this to determine when the driver's window size has changed.
    */
   void (*GetBufferSize)( GLframebuffer *buffer,
                          GLuint *width, GLuint *height );

   /**
    * Resize the given framebuffer to the given size.
    */
   void (*ResizeBuffers)( GLcontext *ctx, GLframebuffer *fb,
                          GLuint width, GLuint height);

   /**
    * Called whenever an error is generated.  
    *
    * __GLcontextRec::ErrorValue contains the error value.
    */
   void (*Error)( GLcontext *ctx );

   /**
    * This is called whenever glFinish() is called.
    */
   void (*Finish)( GLcontext *ctx );

   /**
    * This is called whenever glFlush() is called.
    */
   void (*Flush)( GLcontext *ctx );

   /**
    * Clear the color/depth/stencil/accum buffer(s).
    *
    * \param mask a bitmask of the DD_*_BIT values defined above that indicates
    * which buffers need to be cleared.
    * \param all if true then clear the whole buffer, else clear only the
    * region defined by <tt>(x, y, width, height)</tt>.
    * 
    * This function must obey the glColorMask(), glIndexMask() and
    * glStencilMask() settings!
    * Software Mesa can do masked clears if the device driver can't.
    */
   void (*Clear)( GLcontext *ctx, GLbitfield mask, GLboolean all,
		  GLint x, GLint y, GLint width, GLint height );


   /**
    * \name For hardware accumulation buffer
    */
   /*@{*/
   /**
    * Execute glAccum command within the given scissor region.
    */
   void (*Accum)( GLcontext *ctx, GLenum op, GLfloat value,
		  GLint xpos, GLint ypos, GLint width, GLint height );
   /*@}*/


   /**
    * \name glDraw(), glRead(), glCopyPixels() and glBitmap() functions
    */
   /*@{*/

   /**
    * This is called by glDrawPixels().
    *
    * \p unpack describes how to unpack the source image data.
    */
   void (*DrawPixels)( GLcontext *ctx,
		       GLint x, GLint y, GLsizei width, GLsizei height,
		       GLenum format, GLenum type,
		       const struct gl_pixelstore_attrib *unpack,
		       const GLvoid *pixels );

   /**
    * Called by glReadPixels().
    */
   void (*ReadPixels)( GLcontext *ctx,
		       GLint x, GLint y, GLsizei width, GLsizei height,
		       GLenum format, GLenum type,
		       const struct gl_pixelstore_attrib *unpack,
		       GLvoid *dest );

   /**
    * Do a glCopyPixels().  
    *
    * This function must respect all rasterization state, glPixelTransfer(),
    * glPixelZoom(), etc.
    */
   void (*CopyPixels)( GLcontext *ctx, GLint srcx, GLint srcy,
                       GLsizei width, GLsizei height,
                       GLint dstx, GLint dsty, GLenum type );

   /**
    * This is called by glBitmap().  
    *
    * Works the same as dd_function_table::DrawPixels, above.
    */
   void (*Bitmap)( GLcontext *ctx,
		   GLint x, GLint y, GLsizei width, GLsizei height,
		   const struct gl_pixelstore_attrib *unpack,
		   const GLubyte *bitmap );
   /*@}*/

   
   /**
    * \name Texture image functions
    */
   /*@{*/

   /**
    * Choose texture format.
    * 
    * This is called by the \c _mesa_store_tex[sub]image[123]d() fallback
    * functions.  The driver should examine \p internalFormat and return a
    * pointer to an appropriate gl_texture_format.
    */
   const struct gl_texture_format *(*ChooseTextureFormat)( GLcontext *ctx,
                      GLint internalFormat, GLenum srcFormat, GLenum srcType );

   /**
    * Called by glTexImage1D().
    * 
    * \param target user specified.
    * \param format user specified.
    * \param type user specified.
    * \param pixels user specified.
    * \param packing indicates the image packing of pixels.
    * \param texObj is the target texture object.
    * \param texImage is the target texture image.  It will have the texture \p
    * width, \p height, \p depth, \p border and \p internalFormat information.
    * 
    * \p retainInternalCopy is returned by this function and indicates whether
    * core Mesa should keep an internal copy of the texture image.
    *
    * Drivers should call a fallback routine from texstore.c if needed.
    */
   void (*TexImage1D)( GLcontext *ctx, GLenum target, GLint level,
                       GLint internalFormat,
                       GLint width, GLint border,
                       GLenum format, GLenum type, const GLvoid *pixels,
                       const struct gl_pixelstore_attrib *packing,
                       struct gl_texture_object *texObj,
                       struct gl_texture_image *texImage );

   /**
    * Called by glTexImage2D().
    * 
    * \sa dd_function_table::TexImage1D.
    */
   void (*TexImage2D)( GLcontext *ctx, GLenum target, GLint level,
                       GLint internalFormat,
                       GLint width, GLint height, GLint border,
                       GLenum format, GLenum type, const GLvoid *pixels,
                       const struct gl_pixelstore_attrib *packing,
                       struct gl_texture_object *texObj,
                       struct gl_texture_image *texImage );
   
   /**
    * Called by glTexImage3D().
    * 
    * \sa dd_function_table::TexImage1D.
    */
   void (*TexImage3D)( GLcontext *ctx, GLenum target, GLint level,
                       GLint internalFormat,
                       GLint width, GLint height, GLint depth, GLint border,
                       GLenum format, GLenum type, const GLvoid *pixels,
                       const struct gl_pixelstore_attrib *packing,
                       struct gl_texture_object *texObj,
                       struct gl_texture_image *texImage );

   /**
    * Called by glTexSubImage1D().
    *
    * \param target user specified.
    * \param level user specified.
    * \param xoffset user specified.
    * \param yoffset user specified.
    * \param zoffset user specified.
    * \param width user specified.
    * \param height user specified.
    * \param depth user specified.
    * \param format user specified.
    * \param type user specified.
    * \param pixels user specified.
    * \param packing indicates the image packing of pixels.
    * \param texObj is the target texture object.
    * \param texImage is the target texture image.  It will have the texture \p
    * width, \p height, \p border and \p internalFormat information.
    *
    * The driver should use a fallback routine from texstore.c if needed.
    */
   void (*TexSubImage1D)( GLcontext *ctx, GLenum target, GLint level,
                          GLint xoffset, GLsizei width,
                          GLenum format, GLenum type,
                          const GLvoid *pixels,
                          const struct gl_pixelstore_attrib *packing,
                          struct gl_texture_object *texObj,
                          struct gl_texture_image *texImage );
   
   /**
    * Called by glTexSubImage2D().
    *
    * \sa dd_function_table::TexSubImage1D.
    */
   void (*TexSubImage2D)( GLcontext *ctx, GLenum target, GLint level,
                          GLint xoffset, GLint yoffset,
                          GLsizei width, GLsizei height,
                          GLenum format, GLenum type,
                          const GLvoid *pixels,
                          const struct gl_pixelstore_attrib *packing,
                          struct gl_texture_object *texObj,
                          struct gl_texture_image *texImage );
   
   /**
    * Called by glTexSubImage3D().
    *
    * \sa dd_function_table::TexSubImage1D.
    */
   void (*TexSubImage3D)( GLcontext *ctx, GLenum target, GLint level,
                          GLint xoffset, GLint yoffset, GLint zoffset,
                          GLsizei width, GLsizei height, GLint depth,
                          GLenum format, GLenum type,
                          const GLvoid *pixels,
                          const struct gl_pixelstore_attrib *packing,
                          struct gl_texture_object *texObj,
                          struct gl_texture_image *texImage );

   /**
    * Called by glGetTexImage().
    */
   void (*GetTexImage)( GLcontext *ctx, GLenum target, GLint level,
                        GLenum format, GLenum type, GLvoid *pixels,
                        struct gl_texture_object *texObj,
                        struct gl_texture_image *texImage );

   /**
    * Called by glCopyTexImage1D().
    * 
    * Drivers should use a fallback routine from texstore.c if needed.
    */
   void (*CopyTexImage1D)( GLcontext *ctx, GLenum target, GLint level,
                           GLenum internalFormat, GLint x, GLint y,
                           GLsizei width, GLint border );

   /**
    * Called by glCopyTexImage2D().
    * 
    * Drivers should use a fallback routine from texstore.c if needed.
    */
   void (*CopyTexImage2D)( GLcontext *ctx, GLenum target, GLint level,
                           GLenum internalFormat, GLint x, GLint y,
                           GLsizei width, GLsizei height, GLint border );

   /**
    * Called by glCopyTexSubImage1D().
    * 
    * Drivers should use a fallback routine from texstore.c if needed.
    */
   void (*CopyTexSubImage1D)( GLcontext *ctx, GLenum target, GLint level,
                              GLint xoffset,
                              GLint x, GLint y, GLsizei width );
   /**
    * Called by glCopyTexSubImage2D().
    * 
    * Drivers should use a fallback routine from texstore.c if needed.
    */
   void (*CopyTexSubImage2D)( GLcontext *ctx, GLenum target, GLint level,
                              GLint xoffset, GLint yoffset,
                              GLint x, GLint y,
                              GLsizei width, GLsizei height );
   /**
    * Called by glCopyTexSubImage3D().
    * 
    * Drivers should use a fallback routine from texstore.c if needed.
    */
   void (*CopyTexSubImage3D)( GLcontext *ctx, GLenum target, GLint level,
                              GLint xoffset, GLint yoffset, GLint zoffset,
                              GLint x, GLint y,
                              GLsizei width, GLsizei height );

   /**
    * Called by glTexImage[123]D when user specifies a proxy texture
    * target.  
    *
    * \return GL_TRUE if the proxy test passes, or GL_FALSE if the test fails.
    */
   GLboolean (*TestProxyTexImage)(GLcontext *ctx, GLenum target,
                                  GLint level, GLint internalFormat,