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lxdream.org :: lxdream/src/pvr2/scene.h
lxdream 0.9.1
released Jun 29
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filename src/pvr2/scene.h
changeset 1066:ddffe9d2b332
prev878:c498ba66e851
prev645:a7392098299c
next1133:f3da7d810d5c
author nkeynes
date Sun Jul 05 13:53:48 2009 +1000 (11 years ago)
permissions -rw-r--r--
last change No-op merge lxdream-render to remove head (actually long since merged)
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     1 /**
     2  * $Id$
     3  *
     4  * PVR2 scene description structure (pvr2-private)
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #ifndef lxdream_scene_H
    20 #define lxdream_scene_H 1
    22 #ifdef __cplusplus
    23 extern "C" {
    24 #endif
    26 /************************* Intermediate vertex buffer ************************/
    28 typedef enum { 
    29     SORT_NEVER = 0, 
    30     SORT_TILEFLAG = 1, /* In this mode, sorting is controlled by the per-segment flag */
    31     SORT_ALWAYS = 2 
    32 } tile_sort_mode_t;
    34 typedef enum { SHADOW_NONE=0, SHADOW_CHEAP=1, SHADOW_FULL=2 } shadow_mode_t;
    37 struct vertex_struct {
    38     float u,v;
    39     float x,y,z;
    40     float rgba[4];
    41     float offset_rgba[4];
    42 };
    44 struct polygon_struct {
    45     uint32_t *context;
    46     uint32_t vertex_count; // number of vertexes in polygon
    47     uint32_t tex_id;
    48     int32_t vertex_index; // index of first vertex in vertex buffer
    49     uint32_t mod_tex_id;
    50     int32_t mod_vertex_index; // index of first modified vertex in vertex buffer
    51     struct polygon_struct *next; // chain for tri/quad arrays
    52 };
    54 void pvr2_scene_init(void);
    55 void pvr2_scene_read(void);
    56 void pvr2_scene_shutdown();
    58 uint32_t pvr2_scene_buffer_width();
    59 uint32_t pvr2_scene_buffer_height();
    61 extern unsigned char *video_base;
    63 /**
    64  * Maximum possible size of the vertex buffer. This is figured as follows:
    65  * PVR2 polygon buffer is limited to 4MB. The tightest polygon format 
    66  * is 3 vertexes in 48 bytes = 16 bytes/vertex, (shadow triangle) 
    67  * (the next tightest is 8 vertex in 140 bytes (6-strip colour-only)).
    68  * giving a theoretical maximum of 262144 vertexes.
    69  * The expanded structure is 44 bytes/vertex, giving 
    70  * 11534336 bytes...
    71  */
    72 #define MAX_VERTEXES 262144
    73 #define MAX_VERTEX_BUFFER_SIZE (MAX_VERTEXES*sizeof(struct vertex_struct))
    75 /**
    76  * Maximum polygons - smallest is 1 polygon in 48 bytes, giving
    77  * 87381, plus 1 for the background
    78  * 
    79  */
    80 #define MAX_POLYGONS 87382
    81 #define MAX_POLY_BUFFER_SIZE (MAX_POLYGONS*sizeof(struct polygon_struct))
    82 #define BUF_POLY_MAP_SIZE (4 MB)
    84 /*************************************************************************/
    86 /* Scene data - this structure holds all the intermediate data used during
    87  * the rendering process. 
    88  *
    89  * Special note: if vbo_supported == FALSE, then vertex_array points to a
    90  * malloced chunk of system RAM. Otherwise, vertex_array will be either NULL
    91  * (if the VBO is unmapped), or a pointer into a chunk of GL managed RAM
    92  * (possibly direct-mapped VRAM).
    93  */
    94 struct pvr2_scene_struct {
    95     /** GL ID of the VBO used by the scene (or 0 if VBOs are not in use). */
    96     GLuint vbo_id;
    97     /** Pointer to the vertex array data, or NULL for unmapped VBOs */
    98     struct vertex_struct *vertex_array;
    99     /** Current allocated size (in bytes) of the vertex array */
   100     uint32_t vertex_array_size;
   101     /** Total number of vertexes in the scene (note modified vertexes
   102      * count for 2 vertexes */
   103     uint32_t vertex_count;
   105     /** Pointer to the polygon data for the scene (main ram). 
   106      * This will always have room for at least MAX_POLYGONS */
   107     struct polygon_struct *poly_array;
   108     /** Pointer to the background polygon. This is always a quad, and
   109      * normally the last member of poly_array */
   110     struct polygon_struct *bkgnd_poly;
   111     /** Total number of polygons in the scene */
   112     uint32_t poly_count;
   114     /** Image bounds in 3D - x1,x2,y1,y2,z1,z2 
   115      * x and y values are determined by the clip planes, while z values are
   116      * determined from the vertex data itself.
   117      */
   118     float bounds[6];
   120     /* Total size of the image buffer, determined by the tile map used to
   121      * render the scene */
   122     uint32_t buffer_width, buffer_height;
   124     /** Specifies the translucency auto-sort mode for the scene */
   125     tile_sort_mode_t sort_mode;
   127     shadow_mode_t shadow_mode;
   129     float fog_lut_colour[4];
   130     float fog_vert_colour[4];
   132     /** Pointer to the start of the tile segment list in PVR2 VRAM (32-bit) */
   133     struct tile_segment *segment_list;
   134     /** Map from PVR2 polygon address to an element of poly_array. */
   135     struct polygon_struct **buf_to_poly_map;
   136     /** Pointer to the start of the raw polygon buffer in PVR2 VRAM (32-bit).
   137      * Also only used during parsing */
   138     uint32_t *pvr2_pbuf;
   139     /** Current vertex index during parsing */
   140     uint32_t vertex_index;
   141 };
   143 /**
   144  * Current scene structure. Note this should only be written to by vertex bufer
   145  * functions
   146  */
   147 extern struct pvr2_scene_struct pvr2_scene;
   149 #ifdef __cplusplus
   150 }
   151 #endif
   153 #endif /* !lxdream_scene_H */
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