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

/*
 * Mesa 3-D graphics library
 *
 * Copyright (C) 1999-2006  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
 * THE AUTHORS OR COPYRIGHT HOLDERS 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

#include "util/glheader.h"
#include "formats.h"
#include "menums.h"
#include "compiler/shader_enums.h"

#if defined(_WIN32) && defined(_WINDOWS_)
#error "Should not include <windows.h> here"
#endif

struct gl_buffer_object;
struct gl_context;
struct gl_display_list;
struct gl_framebuffer;
struct gl_image_unit;
struct gl_pixelstore_attrib;
struct gl_program;
struct gl_renderbuffer;
struct gl_renderbuffer_attachment;
struct gl_shader;
struct gl_shader_program;
struct gl_texture_image;
struct gl_texture_object;
struct gl_memory_info;
struct gl_memory_object;
struct gl_query_object;
struct gl_sampler_object;
struct gl_transform_feedback_object;
struct gl_vertex_array_object;
struct ati_fragment_shader;
struct util_queue_monitoring;
struct pipe_draw_info;
struct pipe_draw_indirect_info;
struct pipe_draw_start_count_bias;
struct pipe_vertex_state;
struct pipe_draw_vertex_state_info;
struct pipe_vertex_buffer;
struct pipe_vertex_element;

/* GL_ARB_vertex_buffer_object */
/* Modifies GL_MAP_UNSYNCHRONIZED_BIT to allow driver to fail (return
 * NULL) if buffer is unavailable for immediate mapping.
 *
 * Does GL_MAP_INVALIDATE_RANGE_BIT do this?  It seems so, but it
 * would require more book-keeping in the driver than seems necessary
 * at this point.
 *
 * Does GL_MAP_INVALIDATE_BUFFER_BIT do this?  Not really -- we don't
 * want to provoke the driver to throw away the old storage, we will
 * respect the contents of already referenced data.
 */
#define MESA_MAP_NOWAIT_BIT       0x4000

/* Mapping a buffer is allowed from any thread. */
#define MESA_MAP_THREAD_SAFE_BIT  0x8000

/* This buffer will only be mapped/unmapped once */
#define MESA_MAP_ONCE            0x10000

/* This BufferStorage flag indicates that the buffer will be used
 * by pipe_vertex_state, which doesn't track buffer busyness and doesn't
 * support invalidations.
 */
#define MESA_GALLIUM_VERTEX_STATE_STORAGE 0x20000


/**
 * 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 {
   /**
    * \name Vertex/fragment program functions
    */
   /** Allocate a new program */
   struct gl_program * (*NewProgram)(struct gl_context *ctx,
                                     gl_shader_stage stage,
                                     GLuint id, bool is_arb_asm);
   /**
    * \name Draw functions.
    */
   /*@{*/
   /**
    * For indirect array drawing:
    *
    *    typedef struct {
    *       GLuint count;
    *       GLuint primCount;
    *       GLuint first;
    *       GLuint baseInstance; // in GL 4.2 and later, must be zero otherwise
    *    } DrawArraysIndirectCommand;
    *
    * For indirect indexed drawing:
    *
    *    typedef struct {
    *       GLuint count;
    *       GLuint primCount;
    *       GLuint firstIndex;
    *       GLint  baseVertex;
    *       GLuint baseInstance; // in GL 4.2 and later, must be zero otherwise
    *    } DrawElementsIndirectCommand;
    */

   /**
    * The basic draw function used to implement glDrawArrays, glDrawElements,
    * multidraws, and instancing.
    *
    * The interface is identical to pipe_context::draw_vbo.
    */
   void (*DrawGallium)(struct gl_context *ctx,
                       const struct pipe_draw_info *info,
                       unsigned drawid_offset,
                       const struct pipe_draw_indirect_info *indirect,
                       const struct pipe_draw_start_count_bias *draws,
                       unsigned num_draws);

   /**
    * Same as DrawGallium, but mode can also change between draws.
    *
    * "info" is not const and the following fields can be changed by
    * the callee in addition to the fields listed by DrawGallium:
    * - info->mode
    *
    * This function exists to decrease complexity of DrawGallium.
    */
   void (*DrawGalliumMultiMode)(struct gl_context *ctx,
                                struct pipe_draw_info *info,
                                const struct pipe_draw_start_count_bias *draws,
                                const unsigned char *mode,
                                unsigned num_draws);
   /*@}*/

   /**
    * \name Support for multiple T&L engines
    */
   /*@{*/

   /**
    * Set by the driver-supplied T&L engine.  
    *
    * Set to PRIM_OUTSIDE_BEGIN_END when outside glBegin()/glEnd().
    */
   GLuint CurrentExecPrimitive;

   /**
    * Current glBegin state of an in-progress compilation.  May be
    * GL_POINTS, GL_TRIANGLE_STRIP, etc. or PRIM_OUTSIDE_BEGIN_END
    * or PRIM_UNKNOWN.
    */
   GLuint CurrentSavePrimitive;


#define FLUSH_STORED_VERTICES 0x1
#define FLUSH_UPDATE_CURRENT  0x2
   /**
    * Set by the driver-supplied T&L engine whenever vertices are buffered
    * between glBegin()/glEnd() objects or __struct gl_contextRec::Current
    * is not updated.  A bitmask of the FLUSH_x values above.
    *
    * The dd_function_table::FlushVertices call below may be used to resolve
    * these conditions.
    */
   GLbitfield NeedFlush;

   /** Need to call vbo_save_SaveFlushVertices() upon state change? */
   GLboolean SaveNeedFlush;

   /**@}*/

   /**
    * Query reset status for GL_ARB_robustness
    *
    * Per \c glGetGraphicsResetStatusARB, this function should return a
    * non-zero value once after a reset.  If a reset is non-atomic, the
    * non-zero status should be returned for the duration of the reset.
    */
   GLenum (*GetGraphicsResetStatus)(struct gl_context *ctx);

   /**
    * \name GL_ARB_get_program_binary
    */
   /*@{*/
   /**
    * Calls to retrieve/store a binary serialized copy of the current program.
    */
   void (*ProgramBinarySerializeDriverBlob)(struct gl_context *ctx,
                                            struct gl_shader_program *shProg,
                                            struct gl_program *prog);

   void (*ProgramBinaryDeserializeDriverBlob)(struct gl_context *ctx,
                                              struct gl_shader_program *shProg,
                                              struct gl_program *prog);
   /*@}*/

   /**
    * \name Disk shader cache functions
    */
   /*@{*/
   /**
    * Called to initialize gl_program::driver_cache_blob (and size) with a
    * ralloc allocated buffer.
    *
    * This buffer will be saved and restored as part of the gl_program
    * serialization and deserialization.
    */
   void (*ShaderCacheSerializeDriverBlob)(struct gl_context *ctx,
                                          struct gl_program *prog);
   /*@}*/
};

#endif /* DD_INCLUDED */