 /**************************************************************************
 * 
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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 TUNGSTEN GRAPHICS 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 I915_CONTEXT_H
#define I915_CONTEXT_H


#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "pipe/p_state.h"

#include "draw/draw_vertex.h"

#include "tgsi/tgsi_scan.h"


struct i915_winsys;
struct i915_winsys_buffer;
struct i915_winsys_batchbuffer;


#define I915_TEX_UNITS 8

#define I915_DYNAMIC_MODES4       0
#define I915_DYNAMIC_DEPTHSCALE_0 1 /* just the header */
#define I915_DYNAMIC_DEPTHSCALE_1 2 
#define I915_DYNAMIC_IAB          3
#define I915_DYNAMIC_BC_0         4 /* just the header */
#define I915_DYNAMIC_BC_1         5
#define I915_DYNAMIC_BFO_0        6 
#define I915_DYNAMIC_BFO_1        7
#define I915_DYNAMIC_STP_0        8 
#define I915_DYNAMIC_STP_1        9 
#define I915_DYNAMIC_SC_ENA_0     10 
#define I915_DYNAMIC_SC_RECT_0    11 
#define I915_DYNAMIC_SC_RECT_1    12 
#define I915_DYNAMIC_SC_RECT_2    13 
#define I915_MAX_DYNAMIC          14


#define I915_IMMEDIATE_S0         0
#define I915_IMMEDIATE_S1         1
#define I915_IMMEDIATE_S2         2
#define I915_IMMEDIATE_S3         3
#define I915_IMMEDIATE_S4         4
#define I915_IMMEDIATE_S5         5
#define I915_IMMEDIATE_S6         6
#define I915_IMMEDIATE_S7         7
#define I915_MAX_IMMEDIATE        8

/* These must mach the order of LI0_STATE_* bits, as they will be used
 * to generate hardware packets:
 */
#define I915_CACHE_STATIC         0 
#define I915_CACHE_DYNAMIC        1 /* handled specially */
#define I915_CACHE_SAMPLER        2
#define I915_CACHE_MAP            3
#define I915_CACHE_PROGRAM        4
#define I915_CACHE_CONSTANTS      5
#define I915_MAX_CACHE            6

#define I915_MAX_CONSTANT  32


/** See constant_flags[] below */
#define I915_CONSTFLAG_USER 0x1f


/**
 * Subclass of pipe_shader_state
 */
struct i915_fragment_shader
{
   struct pipe_shader_state state;

   struct tgsi_shader_info info;

   uint *program;
   uint program_len;

   /**
    * constants introduced during translation.
    * These are placed at the end of the constant buffer and grow toward
    * the beginning (eg: slot 31, 30 29, ...)
    * User-provided constants start at 0.
    * This allows both types of constants to co-exist (until there's too many)
    * and doesn't require regenerating/changing the fragment program to
    * shuffle constants around.
    */
   uint num_constants;
   float constants[I915_MAX_CONSTANT][4];

   /**
    * Status of each constant
    * if I915_CONSTFLAG_PARAM, the value must be taken from the corresponding
    * slot of the user's constant buffer. (set by pipe->set_constant_buffer())
    * Else, the bitmask indicates which components are occupied by immediates.
    */
   ubyte constant_flags[I915_MAX_CONSTANT];
};


struct i915_cache_context;

/* Use to calculate differences between state emitted to hardware and
 * current driver-calculated state.  
 */
struct i915_state 
{
   unsigned immediate[I915_MAX_IMMEDIATE];
   unsigned dynamic[I915_MAX_DYNAMIC];

   float constants[PIPE_SHADER_TYPES][I915_MAX_CONSTANT][4];
   /** number of constants passed in through a constant buffer */
   uint num_user_constants[PIPE_SHADER_TYPES];

   /* texture sampler state */
   unsigned sampler[I915_TEX_UNITS][3];
   unsigned sampler_enable_flags;
   unsigned sampler_enable_nr;

   /* texture image buffers */
   unsigned texbuffer[I915_TEX_UNITS][2];

   /** Describes the current hardware vertex layout */
   struct vertex_info vertex_info;

   unsigned id;			/* track lost context events */
};

struct i915_blend_state {
   unsigned iab;
   unsigned modes4;
   unsigned LIS5;
   unsigned LIS6;
};

struct i915_depth_stencil_state {
   unsigned stencil_modes4;
   unsigned bfo[2];
   unsigned stencil_LIS5;
   unsigned depth_LIS6;
};

struct i915_rasterizer_state {
   unsigned light_twoside : 1;
   unsigned st;
   enum interp_mode color_interp;

   unsigned LIS4;
   unsigned LIS7;
   unsigned sc[1];

   const struct pipe_rasterizer_state *templ;

   union { float f; unsigned u; } ds[2];
};

struct i915_sampler_state {
   unsigned state[3];
   const struct pipe_sampler_state *templ;
   unsigned minlod;
   unsigned maxlod;
};

struct i915_velems_state {
   unsigned count;
   struct pipe_vertex_element velem[PIPE_MAX_ATTRIBS];
};


struct i915_context {
   struct pipe_context base;

   struct i915_winsys *iws;

   struct draw_context *draw;

   /* The most recent drawing state as set by the driver:
    */
   const struct i915_blend_state           *blend;
   const struct i915_sampler_state         *sampler[PIPE_MAX_SAMPLERS];
   const struct i915_depth_stencil_state   *depth_stencil;
   const struct i915_rasterizer_state      *rasterizer;

   struct i915_fragment_shader *fs;

   struct pipe_blend_color blend_color;
   struct pipe_stencil_ref stencil_ref;
   struct pipe_clip_state clip;
   /* XXX unneded */
   struct pipe_resource *constants[PIPE_SHADER_TYPES];
   struct pipe_framebuffer_state framebuffer;
   struct pipe_poly_stipple poly_stipple;
   struct pipe_scissor_state scissor;
   struct pipe_sampler_view *fragment_sampler_views[PIPE_MAX_SAMPLERS];
   struct pipe_viewport_state viewport;
   struct pipe_vertex_buffer vertex_buffer[PIPE_MAX_ATTRIBS];
   struct pipe_index_buffer index_buffer;

   unsigned dirty;

   unsigned num_samplers;
   unsigned num_fragment_sampler_views;
   unsigned num_vertex_buffers;

   struct i915_winsys_batchbuffer *batch;

   /** Vertex buffer */
   struct i915_winsys_buffer *vbo;
   size_t vbo_offset;
   unsigned vbo_flushed;

   struct i915_state current;
   unsigned hardware_dirty;
};

/* A flag for each state_tracker state object:
 */
#define I915_NEW_VIEWPORT      0x1
#define I915_NEW_RASTERIZER    0x2
#define I915_NEW_FS            0x4
#define I915_NEW_BLEND         0x8
#define I915_NEW_CLIP          0x10
#define I915_NEW_SCISSOR       0x20
#define I915_NEW_STIPPLE       0x40
#define I915_NEW_FRAMEBUFFER   0x80
#define I915_NEW_ALPHA_TEST    0x100
#define I915_NEW_DEPTH_STENCIL 0x200
#define I915_NEW_SAMPLER       0x400
#define I915_NEW_SAMPLER_VIEW  0x800
#define I915_NEW_CONSTANTS     0x1000
#define I915_NEW_VBO           0x2000
#define I915_NEW_VS            0x4000


/* Driver's internally generated state flags:
 */
#define I915_NEW_VERTEX_FORMAT    0x10000


/* Dirty flags for hardware emit
 */
#define I915_HW_STATIC            (1<<I915_CACHE_STATIC)
#define I915_HW_DYNAMIC           (1<<I915_CACHE_DYNAMIC)
#define I915_HW_SAMPLER           (1<<I915_CACHE_SAMPLER)
#define I915_HW_MAP               (1<<I915_CACHE_MAP)
#define I915_HW_PROGRAM           (1<<I915_CACHE_PROGRAM)
#define I915_HW_CONSTANTS         (1<<I915_CACHE_CONSTANTS)
#define I915_HW_IMMEDIATE         (1<<(I915_MAX_CACHE+0))
#define I915_HW_INVARIENT         (1<<(I915_MAX_CACHE+1))


/***********************************************************************
 * i915_prim_emit.c: 
 */
struct draw_stage *i915_draw_render_stage( struct i915_context *i915 );


/***********************************************************************
 * i915_prim_vbuf.c: 
 */
struct draw_stage *i915_draw_vbuf_stage( struct i915_context *i915 );


/***********************************************************************
 * i915_state_emit.c: 
 */
void i915_emit_hardware_state(struct i915_context *i915 );



/***********************************************************************
 * i915_clear.c: 
 */
void i915_clear( struct pipe_context *pipe, unsigned buffers, const float *rgba,
                 double depth, unsigned stencil);


/***********************************************************************
 * 
 */
void i915_init_state_functions( struct i915_context *i915 );
void i915_init_flush_functions( struct i915_context *i915 );
void i915_init_string_functions( struct i915_context *i915 );


/************************************************************************
 * i915_context.c
 */
struct pipe_context *i915_create_context(struct pipe_screen *screen,
					 void *priv);


/***********************************************************************
 * Inline conversion functions.  These are better-typed than the
 * macros used previously:
 */
static INLINE struct i915_context *
i915_context( struct pipe_context *pipe )
{
   return (struct i915_context *)pipe;
}


#endif
