Search
lxdream.org :: lxdream/src/pvr2/scene.h
lxdream 0.9.1
released Jun 29
Download Now
filename src/pvr2/scene.h
changeset 736:a02d1475ccfd
prev687:6bdc2b7032ea
next847:2089244671d2
author nkeynes
date Mon Jul 14 07:44:42 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Re-indent everything consistently
Fix include guards for consistency as well
view annotate diff log raw
     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 struct vertex_struct {
    35     float u,v;
    36     float x,y,z;
    37     float rgba[4];
    38     float offset_rgba[4];
    39 };
    41 struct polygon_struct {
    42     uint32_t *context;
    43     int cull;             // culling mode
    44     uint32_t vertex_count; // number of vertexes in polygon
    45     uint32_t tex_id;
    46     int32_t vertex_index; // index of first vertex in vertex buffer
    47     uint32_t mod_tex_id;
    48     int32_t mod_vertex_index; // index of first modified vertex in vertex buffer
    49     float center_z;
    50     struct polygon_struct *next; // chain for tri/quad arrays
    51 };
    53 void pvr2_scene_init(void);
    54 void pvr2_scene_read(void);
    55 void pvr2_scene_shutdown();
    57 uint32_t pvr2_scene_buffer_width();
    58 uint32_t pvr2_scene_buffer_height();
    60 extern unsigned char *video_base;
    62 /**
    63  * Maximum possible size of the vertex buffer. This is figured as follows:
    64  * PVR2 polygon buffer is limited to 4MB. The tightest polygon format 
    65  * is 3 vertexes in 48 bytes = 16 bytes/vertex, (shadow triangle) 
    66  * (the next tightest is 8 vertex in 140 bytes (6-strip colour-only)).
    67  * giving a theoretical maximum of 262144 vertexes.
    68  * The expanded structure is 44 bytes/vertex, giving 
    69  * 11534336 bytes...
    70  */
    71 #define MAX_VERTEXES 262144
    72 #define MAX_VERTEX_BUFFER_SIZE (MAX_VERTEXES*sizeof(struct vertex_struct))
    74 /**
    75  * Maximum polygons - smallest is 1 polygon in 48 bytes, giving
    76  * 87381, plus 1 for the background
    77  * 
    78  */
    79 #define MAX_POLYGONS 87382
    80 #define MAX_POLY_BUFFER_SIZE (MAX_POLYGONS*sizeof(struct polygon_struct))
    81 #define BUF_POLY_MAP_SIZE (4 MB)
    83 /*************************************************************************/
    85 /* Scene data - this structure holds all the intermediate data used during
    86  * the rendering process. 
    87  *
    88  * Special note: if vbo_supported == FALSE, then vertex_array points to a
    89  * malloced chunk of system RAM. Otherwise, vertex_array will be either NULL
    90  * (if the VBO is unmapped), or a pointer into a chunk of GL managed RAM
    91  * (possibly direct-mapped VRAM).
    92  */
    93 struct pvr2_scene_struct {
    94     /** GL ID of the VBO used by the scene (or 0 if VBOs are not in use). */
    95     GLuint vbo_id;
    96     /** Pointer to the vertex array data, or NULL for unmapped VBOs */
    97     struct vertex_struct *vertex_array;
    98     /** Current allocated size (in bytes) of the vertex array */
    99     uint32_t vertex_array_size;
   100     /** Total number of vertexes in the scene (note modified vertexes
   101      * count for 2 vertexes */
   102     uint32_t vertex_count;
   104     /** Pointer to the polygon data for the scene (main ram). 
   105      * This will always have room for at least MAX_POLYGONS */
   106     struct polygon_struct *poly_array;
   107     /** Pointer to the background polygon. This is always a quad, and
   108      * normally the last member of poly_array */
   109     struct polygon_struct *bkgnd_poly;
   110     /** Total number of polygons in the scene */
   111     uint32_t poly_count;
   113     /** Image bounds in 3D - x1,x2,y1,y2,z1,z2 
   114      * x and y values are determined by the clip planes, while z values are
   115      * determined from the vertex data itself.
   116      */
   117     float bounds[6];
   119     /* Total size of the image buffer, determined by the tile map used to
   120      * render the scene */
   121     uint32_t buffer_width, buffer_height;
   123     /** True if modifier volumes use the two-parameter form, False if they
   124      * use the cheap-shadow option.
   125      */
   126     gboolean full_shadow;
   127     /** Specifies the translucency auto-sort mode for the scene */
   128     tile_sort_mode_t sort_mode;
   130     /** Pointer to the start of the tile segment list in PVR2 VRAM (32-bit) */
   131     struct tile_segment *segment_list;
   132     /** Map from PVR2 polygon address to an element of poly_array. */
   133     struct polygon_struct **buf_to_poly_map;
   134     /** Pointer to the start of the raw polygon buffer in PVR2 VRAM (32-bit).
   135      * Also only used during parsing */
   136     uint32_t *pvr2_pbuf;
   137     /** Current vertex index during parsing */
   138     uint32_t vertex_index;
   139 };
   141 /**
   142  * Current scene structure. Note this should only be written to by vertex bufer
   143  * functions
   144  */
   145 extern struct pvr2_scene_struct pvr2_scene;
   147 #ifdef __cplusplus
   148 }
   149 #endif
   151 #endif /* !lxdream_scene_H */
.