/**************************************************************************
 * 
 * Copyright 2007 VMware, Inc.
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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 PIPE_CONTEXT_H
#define PIPE_CONTEXT_H

#include "p_compiler.h"
#include "p_format.h"
#include "p_video_enums.h"
#include "p_defines.h"

#ifdef __cplusplus
extern "C" {
#endif


struct pipe_blend_color;
struct pipe_blend_state;
struct pipe_blit_info;
struct pipe_box;
struct pipe_clip_state;
struct pipe_constant_buffer;
struct pipe_depth_stencil_alpha_state;
struct pipe_draw_info;
struct pipe_fence_handle;
struct pipe_framebuffer_state;
struct pipe_index_buffer;
struct pipe_query;
struct pipe_poly_stipple;
struct pipe_rasterizer_state;
struct pipe_resolve_info;
struct pipe_resource;
struct pipe_sampler_state;
struct pipe_sampler_view;
struct pipe_scissor_state;
struct pipe_shader_state;
struct pipe_stencil_ref;
struct pipe_stream_output_target;
struct pipe_surface;
struct pipe_transfer;
struct pipe_vertex_buffer;
struct pipe_vertex_element;
struct pipe_video_buffer;
struct pipe_video_codec;
struct pipe_viewport_state;
struct pipe_compute_state;
union pipe_color_union;
union pipe_query_result;

/**
 * Gallium rendering context.  Basically:
 *  - state setting functions
 *  - VBO drawing functions
 *  - surface functions
 */
struct pipe_context {
   struct pipe_screen *screen;

   void *priv;  /**< context private data (for DRI for example) */
   void *draw;  /**< private, for draw module (temporary?) */

   void (*destroy)( struct pipe_context * );

   /**
    * VBO drawing
    */
   /*@{*/
   void (*draw_vbo)( struct pipe_context *pipe,
                     const struct pipe_draw_info *info );
   /*@}*/

   /**
    * Predicate subsequent rendering on occlusion query result
    * \param query  the query predicate, or NULL if no predicate
    * \param condition whether to skip on FALSE or TRUE query results
    * \param mode  one of PIPE_RENDER_COND_x
    */
   void (*render_condition)( struct pipe_context *pipe,
                             struct pipe_query *query,
                             boolean condition,
                             uint mode );

   /**
    * Query objects
    */
   /*@{*/
   struct pipe_query *(*create_query)( struct pipe_context *pipe,
                                       unsigned query_type,
                                       unsigned index );

   void (*destroy_query)(struct pipe_context *pipe,
                         struct pipe_query *q);

   void (*begin_query)(struct pipe_context *pipe, struct pipe_query *q);
   void (*end_query)(struct pipe_context *pipe, struct pipe_query *q);

   /**
    * Get results of a query.
    * \param wait  if true, this query will block until the result is ready
    * \return TRUE if results are ready, FALSE otherwise
    */
   boolean (*get_query_result)(struct pipe_context *pipe,
                               struct pipe_query *q,
                               boolean wait,
                               union pipe_query_result *result);
   /*@}*/

   /**
    * State functions (create/bind/destroy state objects)
    */
   /*@{*/
   void * (*create_blend_state)(struct pipe_context *,
                                const struct pipe_blend_state *);
   void   (*bind_blend_state)(struct pipe_context *, void *);
   void   (*delete_blend_state)(struct pipe_context *, void  *);

   void * (*create_sampler_state)(struct pipe_context *,
                                  const struct pipe_sampler_state *);
   void   (*bind_sampler_states)(struct pipe_context *,
                                 unsigned shader, unsigned start_slot,
                                 unsigned num_samplers, void **samplers);
   void   (*delete_sampler_state)(struct pipe_context *, void *);

   void * (*create_rasterizer_state)(struct pipe_context *,
                                     const struct pipe_rasterizer_state *);
   void   (*bind_rasterizer_state)(struct pipe_context *, void *);
   void   (*delete_rasterizer_state)(struct pipe_context *, void *);

   void * (*create_depth_stencil_alpha_state)(struct pipe_context *,
                                        const struct pipe_depth_stencil_alpha_state *);
   void   (*bind_depth_stencil_alpha_state)(struct pipe_context *, void *);
   void   (*delete_depth_stencil_alpha_state)(struct pipe_context *, void *);

   void * (*create_fs_state)(struct pipe_context *,
                             const struct pipe_shader_state *);
   void   (*bind_fs_state)(struct pipe_context *, void *);
   void   (*delete_fs_state)(struct pipe_context *, void *);

   void * (*create_vs_state)(struct pipe_context *,
                             const struct pipe_shader_state *);
   void   (*bind_vs_state)(struct pipe_context *, void *);
   void   (*delete_vs_state)(struct pipe_context *, void *);

   void * (*create_gs_state)(struct pipe_context *,
                             const struct pipe_shader_state *);
   void   (*bind_gs_state)(struct pipe_context *, void *);
   void   (*delete_gs_state)(struct pipe_context *, void *);

   void * (*create_vertex_elements_state)(struct pipe_context *,
                                          unsigned num_elements,
                                          const struct pipe_vertex_element *);
   void   (*bind_vertex_elements_state)(struct pipe_context *, void *);
   void   (*delete_vertex_elements_state)(struct pipe_context *, void *);

   /*@}*/

   /**
    * Parameter-like state (or properties)
    */
   /*@{*/
   void (*set_blend_color)( struct pipe_context *,
                            const struct pipe_blend_color * );

   void (*set_stencil_ref)( struct pipe_context *,
                            const struct pipe_stencil_ref * );

   void (*set_sample_mask)( struct pipe_context *,
                            unsigned sample_mask );

   void (*set_min_samples)( struct pipe_context *,
                            unsigned min_samples );

   void (*set_clip_state)( struct pipe_context *,
                            const struct pipe_clip_state * );

   void (*set_constant_buffer)( struct pipe_context *,
                                uint shader, uint index,
                                struct pipe_constant_buffer *buf );

   void (*set_framebuffer_state)( struct pipe_context *,
                                  const struct pipe_framebuffer_state * );

   void (*set_polygon_stipple)( struct pipe_context *,
				const struct pipe_poly_stipple * );

   void (*set_scissor_states)( struct pipe_context *,
                               unsigned start_slot,
                               unsigned num_scissors,
                               const struct pipe_scissor_state * );

   void (*set_viewport_states)( struct pipe_context *,
                                unsigned start_slot,
                                unsigned num_viewports,
                                const struct pipe_viewport_state *);

   void (*set_sampler_views)(struct pipe_context *, unsigned shader,
                             unsigned start_slot, unsigned num_views,
                             struct pipe_sampler_view **);

   /**
    * Bind an array of shader resources that will be used by the
    * graphics pipeline.  Any resources that were previously bound to
    * the specified range will be unbound after this call.
    *
    * \param start      first resource to bind.
    * \param count      number of consecutive resources to bind.
    * \param resources  array of pointers to the resources to bind, it
    *                   should contain at least \a count elements
    *                   unless it's NULL, in which case no new
    *                   resources will be bound.
    */
   void (*set_shader_resources)(struct pipe_context *,
                                unsigned start, unsigned count,
                                struct pipe_surface **resources);

   void (*set_vertex_buffers)( struct pipe_context *,
                               unsigned start_slot,
                               unsigned num_buffers,
                               const struct pipe_vertex_buffer * );

   void (*set_index_buffer)( struct pipe_context *pipe,
                             const struct pipe_index_buffer * );

   /*@}*/

   /**
    * Stream output functions.
    */
   /*@{*/

   struct pipe_stream_output_target *(*create_stream_output_target)(
                        struct pipe_context *,
                        struct pipe_resource *,
                        unsigned buffer_offset,
                        unsigned buffer_size);

   void (*stream_output_target_destroy)(struct pipe_context *,
                                        struct pipe_stream_output_target *);

   void (*set_stream_output_targets)(struct pipe_context *,
                              unsigned num_targets,
                              struct pipe_stream_output_target **targets,
                              const unsigned *offsets);

   /*@}*/


   /**
    * Resource functions for blit-like functionality
    *
    * If a driver supports multisampling, blit must implement color resolve.
    */
   /*@{*/

   /**
    * Copy a block of pixels from one resource to another.
    * The resource must be of the same format.
    * Resources with nr_samples > 1 are not allowed.
    */
   void (*resource_copy_region)(struct pipe_context *pipe,
                                struct pipe_resource *dst,
                                unsigned dst_level,
                                unsigned dstx, unsigned dsty, unsigned dstz,
                                struct pipe_resource *src,
                                unsigned src_level,
                                const struct pipe_box *src_box);

   /* Optimal hardware path for blitting pixels.
    * Scaling, format conversion, up- and downsampling (resolve) are allowed.
    */
   void (*blit)(struct pipe_context *pipe,
                const struct pipe_blit_info *info);

   /*@}*/

   /**
    * Clear the specified set of currently bound buffers to specified values.
    * The entire buffers are cleared (no scissor, no colormask, etc).
    *
    * \param buffers  bitfield of PIPE_CLEAR_* values.
    * \param color  pointer to a union of fiu array for each of r, g, b, a.
    * \param depth  depth clear value in [0,1].
    * \param stencil  stencil clear value
    */
   void (*clear)(struct pipe_context *pipe,
                 unsigned buffers,
                 const union pipe_color_union *color,
                 double depth,
                 unsigned stencil);

   /**
    * Clear a color rendertarget surface.
    * \param color  pointer to an union of fiu array for each of r, g, b, a.
    */
   void (*clear_render_target)(struct pipe_context *pipe,
                               struct pipe_surface *dst,
                               const union pipe_color_union *color,
                               unsigned dstx, unsigned dsty,
                               unsigned width, unsigned height);

   /**
    * Clear a depth-stencil surface.
    * \param clear_flags  bitfield of PIPE_CLEAR_DEPTH/STENCIL values.
    * \param depth  depth clear value in [0,1].
    * \param stencil  stencil clear value
    */
   void (*clear_depth_stencil)(struct pipe_context *pipe,
                               struct pipe_surface *dst,
                               unsigned clear_flags,
                               double depth,
                               unsigned stencil,
                               unsigned dstx, unsigned dsty,
                               unsigned width, unsigned height);

   /**
    * Clear a buffer. Runs a memset over the specified region with the element
    * value passed in through clear_value of size clear_value_size.
    */
   void (*clear_buffer)(struct pipe_context *pipe,
                        struct pipe_resource *res,
                        unsigned offset,
                        unsigned size,
                        const void *clear_value,
                        int clear_value_size);

   /** Flush draw commands
    *
    * \param flags  bitfield of enum pipe_flush_flags values.
    */
   void (*flush)(struct pipe_context *pipe,
                 struct pipe_fence_handle **fence,
                 unsigned flags);

   /**
    * Create a view on a texture to be used by a shader stage.
    */
   struct pipe_sampler_view * (*create_sampler_view)(struct pipe_context *ctx,
                                                     struct pipe_resource *texture,
                                                     const struct pipe_sampler_view *templat);

   void (*sampler_view_destroy)(struct pipe_context *ctx,
                                struct pipe_sampler_view *view);


   /**
    * Get a surface which is a "view" into a resource, used by
    * render target / depth stencil stages.
    */
   struct pipe_surface *(*create_surface)(struct pipe_context *ctx,
                                          struct pipe_resource *resource,
                                          const struct pipe_surface *templat);

   void (*surface_destroy)(struct pipe_context *ctx,
                           struct pipe_surface *);

   /**
    * Map a resource.
    *
    * Transfers are (by default) context-private and allow uploads to be
    * interleaved with rendering.
    *
    * out_transfer will contain the transfer object that must be passed
    * to all the other transfer functions. It also contains useful
    * information (like texture strides).
    */
   void *(*transfer_map)(struct pipe_context *,
                         struct pipe_resource *resource,
                         unsigned level,
                         unsigned usage,  /* a combination of PIPE_TRANSFER_x */
                         const struct pipe_box *,
                         struct pipe_transfer **out_transfer);

   /* If transfer was created with WRITE|FLUSH_EXPLICIT, only the
    * regions specified with this call are guaranteed to be written to
    * the resource.
    */
   void (*transfer_flush_region)( struct pipe_context *,
				  struct pipe_transfer *transfer,
				  const struct pipe_box *);

   void (*transfer_unmap)(struct pipe_context *,
                          struct pipe_transfer *transfer);

   /* One-shot transfer operation with data supplied in a user
    * pointer.  XXX: strides??
    */
   void (*transfer_inline_write)( struct pipe_context *,
                                  struct pipe_resource *,
                                  unsigned level,
                                  unsigned usage, /* a combination of PIPE_TRANSFER_x */
                                  const struct pipe_box *,
                                  const void *data,
                                  unsigned stride,
                                  unsigned layer_stride);

   /**
    * Flush any pending framebuffer writes and invalidate texture caches.
    */
   void (*texture_barrier)(struct pipe_context *);

   /**
    * Flush caches according to flags.
    */
   void (*memory_barrier)(struct pipe_context *, unsigned flags);

   /**
    * Creates a video codec for a specific video format/profile
    */
   struct pipe_video_codec *(*create_video_codec)( struct pipe_context *context,
                                                   const struct pipe_video_codec *templat );

   /**
    * Creates a video buffer as decoding target
    */
   struct pipe_video_buffer *(*create_video_buffer)( struct pipe_context *context,
                                                     const struct pipe_video_buffer *templat );

   /**
    * Compute kernel execution
    */
   /*@{*/
   /**
    * Define the compute program and parameters to be used by
    * pipe_context::launch_grid.
    */
   void *(*create_compute_state)(struct pipe_context *context,
				 const struct pipe_compute_state *);
   void (*bind_compute_state)(struct pipe_context *, void *);
   void (*delete_compute_state)(struct pipe_context *, void *);

   /**
    * Bind an array of shader resources that will be used by the
    * compute program.  Any resources that were previously bound to
    * the specified range will be unbound after this call.
    *
    * \param start      first resource to bind.
    * \param count      number of consecutive resources to bind.
    * \param resources  array of pointers to the resources to bind, it
    *                   should contain at least \a count elements
    *                   unless it's NULL, in which case no new
    *                   resources will be bound.
    */
   void (*set_compute_resources)(struct pipe_context *,
                                 unsigned start, unsigned count,
                                 struct pipe_surface **resources);

   /**
    * Bind an array of buffers to be mapped into the address space of
    * the GLOBAL resource.  Any buffers that were previously bound
    * between [first, first + count - 1] are unbound after this call.
    *
    * \param first      first buffer to map.
    * \param count      number of consecutive buffers to map.
    * \param resources  array of pointers to the buffers to map, it
    *                   should contain at least \a count elements
    *                   unless it's NULL, in which case no new
    *                   resources will be bound.
    * \param handles    array of pointers to the memory locations that
    *                   will be updated with the address each buffer
    *                   will be mapped to.  The base memory address of
    *                   each of the buffers will be added to the value
    *                   pointed to by its corresponding handle to form
    *                   the final address argument.  It should contain
    *                   at least \a count elements, unless \a
    *                   resources is NULL in which case \a handles
    *                   should be NULL as well.
    *
    * Note that the driver isn't required to make any guarantees about
    * the contents of the \a handles array being valid anytime except
    * during the subsequent calls to pipe_context::launch_grid.  This
    * means that the only sensible location handles[i] may point to is
    * somewhere within the INPUT buffer itself.  This is so to
    * accommodate implementations that lack virtual memory but
    * nevertheless migrate buffers on the fly, leading to resource
    * base addresses that change on each kernel invocation or are
    * unknown to the pipe driver.
    */
   void (*set_global_binding)(struct pipe_context *context,
                              unsigned first, unsigned count,
                              struct pipe_resource **resources,
                              uint32_t **handles);

   /**
    * Launch the compute kernel starting from instruction \a pc of the
    * currently bound compute program.
    *
    * \a grid_layout and \a block_layout are arrays of size \a
    * PIPE_COMPUTE_CAP_GRID_DIMENSION that determine the layout of the
    * grid (in block units) and working block (in thread units) to be
    * used, respectively.
    *
    * \a pc For drivers that use PIPE_SHADER_IR_LLVM as their prefered IR,
    * this value will be the index of the kernel in the opencl.kernels
    * metadata list.
    *
    * \a input will be used to initialize the INPUT resource, and it
    * should point to a buffer of at least
    * pipe_compute_state::req_input_mem bytes.
    */
   void (*launch_grid)(struct pipe_context *context,
                       const uint *block_layout, const uint *grid_layout,
                       uint32_t pc, const void *input);
   /*@}*/

   /**
    * Get sample position for an individual sample point.
    *
    * \param sample_count - total number of samples
    * \param sample_index - sample to get the position values for
    * \param out_value - return value of 2 floats for x and y position for
    *                    requested sample.
    */
   void (*get_sample_position)(struct pipe_context *context,
                               unsigned sample_count,
                               unsigned sample_index,
                               float *out_value);

   /**
    * Flush the resource cache, so that the resource can be used
    * by an external client. Possible usage:
    * - flushing a resource before presenting it on the screen
    * - flushing a resource if some other process or device wants to use it
    * This shouldn't be used to flush caches if the resource is only managed
    * by a single pipe_screen and is not shared with another process.
    * (i.e. you shouldn't use it to flush caches explicitly if you want to e.g.
    * use the resource for texturing)
    */
   void (*flush_resource)(struct pipe_context *ctx,
                          struct pipe_resource *resource);

   /**
    * Invalidate the contents of the resource.
    *
    * This is used to implement EGL's semantic of undefined depth/stencil
    * contenst after a swapbuffers.  This allows a tiled renderer (for
    * example) to not store the depth buffer.
    */
   void (*invalidate_resource)(struct pipe_context *ctx,
                               struct pipe_resource *resource);

};


#ifdef __cplusplus
}
#endif

#endif /* PIPE_CONTEXT_H */
