[46acc71] | 1 | /* $Id: tr.c,v 1.9 1998/01/29 16:56:54 brianp Exp $ */ |
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| 2 | |
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| 3 | /* |
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| 4 | * $Log: tr.c,v $ |
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| 5 | * Revision 1.9 1998/01/29 16:56:54 brianp |
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| 6 | * allow trOrtho() and trFrustum() to be called at any time, minor clean-up |
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| 7 | * |
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| 8 | * Revision 1.8 1998/01/28 19:47:39 brianp |
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| 9 | * minor clean-up for C++ |
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| 10 | * |
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| 11 | * Revision 1.7 1997/07/21 17:34:38 brianp |
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| 12 | * added tile borders |
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| 13 | * |
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| 14 | * Revision 1.6 1997/07/21 15:47:35 brianp |
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| 15 | * renamed all "near" and "far" variables |
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| 16 | * |
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| 17 | * Revision 1.5 1997/04/26 21:23:25 brianp |
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| 18 | * added trRasterPos3f function |
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| 19 | * |
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| 20 | * Revision 1.4 1997/04/26 19:59:36 brianp |
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| 21 | * set CurrentTile to -1 before first tile and after last tile |
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| 22 | * |
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| 23 | * Revision 1.3 1997/04/22 23:51:15 brianp |
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| 24 | * added WIN32 header stuff, removed tabs |
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| 25 | * |
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| 26 | * Revision 1.2 1997/04/19 23:26:10 brianp |
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| 27 | * many API changes |
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| 28 | * |
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| 29 | * Revision 1.1 1997/04/18 21:53:05 brianp |
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| 30 | * Initial revision |
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| 31 | * |
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| 32 | */ |
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| 33 | |
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| 34 | |
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| 35 | /* |
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| 36 | * Tiled Rendering library |
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| 37 | * Version 1.1 |
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| 38 | * Copyright (C) Brian Paul |
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| 39 | */ |
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| 40 | |
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| 41 | |
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| 42 | #include <assert.h> |
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| 43 | #include <math.h> |
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| 44 | #include <stdlib.h> |
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| 45 | #include <stdio.h> |
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| 46 | #ifdef WIN32 |
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| 47 | #include <windows.h> |
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| 48 | #endif |
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| 49 | #include <GL/gl.h> |
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| 50 | #include <GL/glu.h> |
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| 51 | #include "tr.h" |
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| 52 | |
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| 53 | |
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| 54 | #define DEFAULT_TILE_WIDTH 256 |
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| 55 | #define DEFAULT_TILE_HEIGHT 256 |
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| 56 | #define DEFAULT_TILE_BORDER 0 |
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| 57 | |
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| 58 | |
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| 59 | struct _TRctx { |
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| 60 | /* Final image parameters */ |
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| 61 | GLint ImageWidth, ImageHeight; |
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| 62 | GLenum ImageFormat, ImageType; |
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| 63 | GLvoid *ImageBuffer; |
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| 64 | |
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| 65 | /* Tile parameters */ |
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| 66 | GLint TileWidth, TileHeight; |
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| 67 | GLint TileWidthNB, TileHeightNB; |
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| 68 | GLint TileBorder; |
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| 69 | GLenum TileFormat, TileType; |
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| 70 | GLvoid *TileBuffer; |
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| 71 | |
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| 72 | /* Projection parameters */ |
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| 73 | GLboolean Perspective; |
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| 74 | GLdouble Left; |
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| 75 | GLdouble Right; |
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| 76 | GLdouble Bottom; |
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| 77 | GLdouble Top; |
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| 78 | GLdouble Near; |
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| 79 | GLdouble Far; |
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| 80 | |
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| 81 | /* Misc */ |
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| 82 | TRenum RowOrder; |
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| 83 | GLint Rows, Columns; |
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| 84 | GLint CurrentTile; |
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| 85 | GLint CurrentTileWidth, CurrentTileHeight; |
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| 86 | GLint CurrentRow, CurrentColumn; |
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| 87 | |
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| 88 | GLint ViewportSave[4]; |
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| 89 | }; |
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| 90 | |
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| 91 | |
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| 92 | |
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| 93 | /* |
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| 94 | * Misc setup including computing number of tiles (rows and columns). |
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| 95 | */ |
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| 96 | static void Setup(TRcontext *tr) |
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| 97 | { |
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| 98 | if (!tr) |
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| 99 | return; |
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| 100 | |
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| 101 | tr->Columns = (tr->ImageWidth + tr->TileWidthNB - 1) / tr->TileWidthNB; |
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| 102 | tr->Rows = (tr->ImageHeight + tr->TileHeightNB - 1) / tr->TileHeightNB; |
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| 103 | tr->CurrentTile = 0; |
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| 104 | |
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| 105 | assert(tr->Columns >= 0); |
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| 106 | assert(tr->Rows >= 0); |
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| 107 | } |
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| 108 | |
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| 109 | |
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| 110 | |
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| 111 | TRcontext *trNew(void) |
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| 112 | { |
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| 113 | TRcontext *tr = (TRcontext *) calloc(1, sizeof(TRcontext)); |
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| 114 | if (tr) { |
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| 115 | tr->TileWidth = DEFAULT_TILE_WIDTH; |
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| 116 | tr->TileHeight = DEFAULT_TILE_HEIGHT; |
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| 117 | tr->TileBorder = DEFAULT_TILE_BORDER; |
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| 118 | tr->RowOrder = TR_BOTTOM_TO_TOP; |
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| 119 | tr->CurrentTile = -1; |
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| 120 | } |
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| 121 | return (TRcontext *) tr; |
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| 122 | } |
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| 123 | |
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| 124 | |
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| 125 | void trDelete(TRcontext *tr) |
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| 126 | { |
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| 127 | if (tr) |
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| 128 | free(tr); |
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| 129 | } |
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| 130 | |
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| 131 | |
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| 132 | |
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| 133 | void trTileSize(TRcontext *tr, GLint width, GLint height, GLint border) |
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| 134 | { |
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| 135 | if (!tr) |
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| 136 | return; |
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| 137 | |
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| 138 | assert(border >= 0); |
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| 139 | assert(width >= 1); |
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| 140 | assert(height >= 1); |
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| 141 | assert(width >= 2*border); |
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| 142 | assert(height >= 2*border); |
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| 143 | |
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| 144 | tr->TileBorder = border; |
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| 145 | tr->TileWidth = width; |
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| 146 | tr->TileHeight = height; |
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| 147 | tr->TileWidthNB = width - 2 * border; |
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| 148 | tr->TileHeightNB = height - 2 * border; |
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| 149 | Setup(tr); |
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| 150 | } |
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| 151 | |
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| 152 | |
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| 153 | |
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| 154 | void trTileBuffer(TRcontext *tr, GLenum format, GLenum type, GLvoid *image) |
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| 155 | { |
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| 156 | if (!tr) |
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| 157 | return; |
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| 158 | |
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| 159 | tr->TileFormat = format; |
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| 160 | tr->TileType = type; |
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| 161 | tr->TileBuffer = image; |
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| 162 | } |
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| 163 | |
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| 164 | |
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| 165 | |
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| 166 | void trImageSize(TRcontext *tr, GLint width, GLint height) |
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| 167 | { |
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| 168 | if (!tr) |
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| 169 | return; |
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| 170 | |
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| 171 | tr->ImageWidth = width; |
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| 172 | tr->ImageHeight = height; |
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| 173 | Setup(tr); |
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| 174 | } |
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| 175 | |
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| 176 | |
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| 177 | void trImageBuffer(TRcontext *tr, GLenum format, GLenum type, GLvoid *image) |
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| 178 | { |
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| 179 | if (!tr) |
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| 180 | return; |
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| 181 | |
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| 182 | tr->ImageFormat = format; |
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| 183 | tr->ImageType = type; |
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| 184 | tr->ImageBuffer = image; |
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| 185 | } |
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| 186 | |
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| 187 | |
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| 188 | GLint trGet(TRcontext *tr, TRenum param) |
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| 189 | { |
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| 190 | if (!tr) |
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| 191 | return 0; |
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| 192 | |
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| 193 | switch (param) { |
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| 194 | case TR_TILE_WIDTH: |
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[b49ac56] | 195 | return tr->TileWidth; |
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[46acc71] | 196 | case TR_TILE_HEIGHT: |
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[b49ac56] | 197 | return tr->TileHeight; |
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[46acc71] | 198 | case TR_TILE_BORDER: |
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[b49ac56] | 199 | return tr->TileBorder; |
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[46acc71] | 200 | case TR_IMAGE_WIDTH: |
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[b49ac56] | 201 | return tr->ImageWidth; |
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[46acc71] | 202 | case TR_IMAGE_HEIGHT: |
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[b49ac56] | 203 | return tr->ImageHeight; |
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[46acc71] | 204 | case TR_ROWS: |
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[b49ac56] | 205 | return tr->Rows; |
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[46acc71] | 206 | case TR_COLUMNS: |
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[b49ac56] | 207 | return tr->Columns; |
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[46acc71] | 208 | case TR_CURRENT_ROW: |
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[b49ac56] | 209 | if (tr->CurrentTile<0) |
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| 210 | return -1; |
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| 211 | else |
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| 212 | return tr->CurrentRow; |
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[46acc71] | 213 | case TR_CURRENT_COLUMN: |
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[b49ac56] | 214 | if (tr->CurrentTile<0) |
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| 215 | return -1; |
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| 216 | else |
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| 217 | return tr->CurrentColumn; |
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[46acc71] | 218 | case TR_CURRENT_TILE_WIDTH: |
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[b49ac56] | 219 | return tr->CurrentTileWidth; |
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[46acc71] | 220 | case TR_CURRENT_TILE_HEIGHT: |
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[b49ac56] | 221 | return tr->CurrentTileHeight; |
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[46acc71] | 222 | case TR_ROW_ORDER: |
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[b49ac56] | 223 | return (GLint) tr->RowOrder; |
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[46acc71] | 224 | default: |
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[b49ac56] | 225 | return 0; |
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[46acc71] | 226 | } |
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| 227 | } |
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| 228 | |
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| 229 | |
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| 230 | void trRowOrder(TRcontext *tr, TRenum order) |
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| 231 | { |
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| 232 | if (!tr) |
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| 233 | return; |
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| 234 | |
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| 235 | if (order==TR_TOP_TO_BOTTOM || order==TR_BOTTOM_TO_TOP) |
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| 236 | tr->RowOrder = order; |
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| 237 | } |
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| 238 | |
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| 239 | |
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| 240 | void trOrtho(TRcontext *tr, |
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[b49ac56] | 241 | GLdouble left, GLdouble right, |
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| 242 | GLdouble bottom, GLdouble top, |
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| 243 | GLdouble zNear, GLdouble zFar) |
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[46acc71] | 244 | { |
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| 245 | if (!tr) |
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| 246 | return; |
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| 247 | |
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| 248 | tr->Perspective = GL_FALSE; |
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| 249 | tr->Left = left; |
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| 250 | tr->Right = right; |
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| 251 | tr->Bottom = bottom; |
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| 252 | tr->Top = top; |
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| 253 | tr->Near = zNear; |
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| 254 | tr->Far = zFar; |
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| 255 | } |
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| 256 | |
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| 257 | |
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| 258 | void trFrustum(TRcontext *tr, |
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[b49ac56] | 259 | GLdouble left, GLdouble right, |
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| 260 | GLdouble bottom, GLdouble top, |
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| 261 | GLdouble zNear, GLdouble zFar) |
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[46acc71] | 262 | { |
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| 263 | if (!tr) |
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| 264 | return; |
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| 265 | |
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| 266 | tr->Perspective = GL_TRUE; |
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| 267 | tr->Left = left; |
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| 268 | tr->Right = right; |
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| 269 | tr->Bottom = bottom; |
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| 270 | tr->Top = top; |
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| 271 | tr->Near = zNear; |
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| 272 | tr->Far = zFar; |
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| 273 | } |
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| 274 | |
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| 275 | |
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| 276 | void trPerspective(TRcontext *tr, |
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[b49ac56] | 277 | GLdouble fovy, GLdouble aspect, |
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| 278 | GLdouble zNear, GLdouble zFar ) |
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[46acc71] | 279 | { |
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| 280 | GLdouble xmin, xmax, ymin, ymax; |
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| 281 | ymax = zNear * tan(fovy * 3.14159265 / 360.0); |
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| 282 | ymin = -ymax; |
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| 283 | xmin = ymin * aspect; |
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| 284 | xmax = ymax * aspect; |
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| 285 | trFrustum(tr, xmin, xmax, ymin, ymax, zNear, zFar); |
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| 286 | } |
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| 287 | |
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| 288 | |
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| 289 | void trBeginTile(TRcontext *tr) |
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| 290 | { |
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| 291 | GLint matrixMode; |
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| 292 | GLint tileWidth, tileHeight, border; |
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| 293 | GLdouble left, right, bottom, top; |
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| 294 | |
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| 295 | if (!tr) |
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| 296 | return; |
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| 297 | |
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| 298 | if (tr->CurrentTile <= 0) { |
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| 299 | Setup(tr); |
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| 300 | /* Save user's viewport, will be restored after last tile rendered */ |
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| 301 | glGetIntegerv(GL_VIEWPORT, tr->ViewportSave); |
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| 302 | } |
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| 303 | |
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| 304 | /* which tile (by row and column) we're about to render */ |
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| 305 | if (tr->RowOrder==TR_BOTTOM_TO_TOP) { |
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| 306 | tr->CurrentRow = tr->CurrentTile / tr->Columns; |
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| 307 | tr->CurrentColumn = tr->CurrentTile % tr->Columns; |
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| 308 | } |
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| 309 | else if (tr->RowOrder==TR_TOP_TO_BOTTOM) { |
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| 310 | tr->CurrentRow = tr->Rows - (tr->CurrentTile / tr->Columns) - 1; |
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| 311 | tr->CurrentColumn = tr->CurrentTile % tr->Columns; |
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| 312 | } |
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| 313 | else { |
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| 314 | /* This should never happen */ |
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| 315 | abort(); |
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| 316 | } |
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| 317 | assert(tr->CurrentRow < tr->Rows); |
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| 318 | assert(tr->CurrentColumn < tr->Columns); |
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| 319 | |
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| 320 | border = tr->TileBorder; |
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| 321 | |
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| 322 | /* Compute actual size of this tile with border */ |
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| 323 | if (tr->CurrentRow < tr->Rows-1) |
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| 324 | tileHeight = tr->TileHeight; |
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| 325 | else |
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| 326 | tileHeight = tr->ImageHeight - (tr->Rows-1) * (tr->TileHeightNB) + 2 * border; |
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| 327 | |
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| 328 | if (tr->CurrentColumn < tr->Columns-1) |
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| 329 | tileWidth = tr->TileWidth; |
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| 330 | else |
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| 331 | tileWidth = tr->ImageWidth - (tr->Columns-1) * (tr->TileWidthNB) + 2 * border; |
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| 332 | |
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| 333 | /* Save tile size, with border */ |
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| 334 | tr->CurrentTileWidth = tileWidth; |
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| 335 | tr->CurrentTileHeight = tileHeight; |
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| 336 | |
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| 337 | glViewport(0, 0, tileWidth, tileHeight); /* tile size including border */ |
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| 338 | |
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| 339 | /* save current matrix mode */ |
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| 340 | glGetIntegerv(GL_MATRIX_MODE, &matrixMode); |
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| 341 | glMatrixMode(GL_PROJECTION); |
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| 342 | glLoadIdentity(); |
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| 343 | |
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| 344 | /* compute projection parameters */ |
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| 345 | left = tr->Left + (tr->Right - tr->Left) |
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[b49ac56] | 346 | * (tr->CurrentColumn * tr->TileWidthNB - border) / tr->ImageWidth; |
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[46acc71] | 347 | right = left + (tr->Right - tr->Left) * tileWidth / tr->ImageWidth; |
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| 348 | bottom = tr->Bottom + (tr->Top - tr->Bottom) |
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[b49ac56] | 349 | * (tr->CurrentRow * tr->TileHeightNB - border) / tr->ImageHeight; |
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[46acc71] | 350 | top = bottom + (tr->Top - tr->Bottom) * tileHeight / tr->ImageHeight; |
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| 351 | |
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| 352 | if (tr->Perspective) |
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| 353 | glFrustum(left, right, bottom, top, tr->Near, tr->Far); |
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| 354 | else |
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| 355 | glOrtho(left, right, bottom, top, tr->Near, tr->Far); |
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| 356 | |
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| 357 | /* restore user's matrix mode */ |
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| 358 | glMatrixMode(matrixMode); |
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| 359 | } |
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| 360 | |
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| 361 | |
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| 362 | |
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| 363 | int trEndTile(TRcontext *tr) |
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| 364 | { |
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| 365 | GLint prevRowLength, prevSkipRows, prevSkipPixels, prevAlignment; |
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| 366 | |
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| 367 | if (!tr) |
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| 368 | return 0; |
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| 369 | |
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| 370 | assert(tr->CurrentTile>=0); |
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| 371 | |
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| 372 | /* be sure OpenGL rendering is finished */ |
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| 373 | glFlush(); |
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| 374 | |
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| 375 | /* save current glPixelStore values */ |
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| 376 | glGetIntegerv(GL_PACK_ROW_LENGTH, &prevRowLength); |
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| 377 | glGetIntegerv(GL_PACK_SKIP_ROWS, &prevSkipRows); |
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| 378 | glGetIntegerv(GL_PACK_SKIP_PIXELS, &prevSkipPixels); |
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| 379 | /*glGetIntegerv(GL_PACK_ALIGNMENT, &prevAlignment);*/ |
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| 380 | |
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| 381 | if (tr->TileBuffer) { |
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| 382 | GLint srcX = tr->TileBorder; |
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| 383 | GLint srcY = tr->TileBorder; |
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| 384 | GLint srcWidth = tr->TileWidthNB; |
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| 385 | GLint srcHeight = tr->TileHeightNB; |
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| 386 | glReadPixels(srcX, srcY, srcWidth, srcHeight, |
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[b49ac56] | 387 | tr->TileFormat, tr->TileType, tr->TileBuffer); |
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[46acc71] | 388 | } |
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| 389 | |
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| 390 | if (tr->ImageBuffer) { |
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| 391 | GLint srcX = tr->TileBorder; |
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| 392 | GLint srcY = tr->TileBorder; |
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| 393 | GLint srcWidth = tr->CurrentTileWidth - 2 * tr->TileBorder; |
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| 394 | GLint srcHeight = tr->CurrentTileHeight - 2 * tr->TileBorder; |
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| 395 | GLint destX = tr->TileWidthNB * tr->CurrentColumn; |
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| 396 | GLint destY = tr->TileHeightNB * tr->CurrentRow; |
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| 397 | |
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| 398 | /* setup pixel store for glReadPixels */ |
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| 399 | glPixelStorei(GL_PACK_ROW_LENGTH, tr->ImageWidth); |
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| 400 | glPixelStorei(GL_PACK_SKIP_ROWS, destY); |
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| 401 | glPixelStorei(GL_PACK_SKIP_PIXELS, destX); |
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| 402 | /*glPixelStorei(GL_PACK_ALIGNMENT, 1);*/ |
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| 403 | |
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| 404 | /* read the tile into the final image */ |
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| 405 | glReadPixels(srcX, srcY, srcWidth, srcHeight, |
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[b49ac56] | 406 | tr->ImageFormat, tr->ImageType, tr->ImageBuffer); |
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[46acc71] | 407 | } |
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| 408 | |
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| 409 | /* restore previous glPixelStore values */ |
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| 410 | glPixelStorei(GL_PACK_ROW_LENGTH, prevRowLength); |
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| 411 | glPixelStorei(GL_PACK_SKIP_ROWS, prevSkipRows); |
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| 412 | glPixelStorei(GL_PACK_SKIP_PIXELS, prevSkipPixels); |
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| 413 | /*glPixelStorei(GL_PACK_ALIGNMENT, prevAlignment);*/ |
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| 414 | |
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| 415 | /* increment tile counter, return 1 if more tiles left to render */ |
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| 416 | tr->CurrentTile++; |
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| 417 | if (tr->CurrentTile >= tr->Rows * tr->Columns) { |
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| 418 | /* restore user's viewport */ |
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| 419 | glViewport(tr->ViewportSave[0], tr->ViewportSave[1], |
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[b49ac56] | 420 | tr->ViewportSave[2], tr->ViewportSave[3]); |
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[46acc71] | 421 | tr->CurrentTile = -1; /* all done */ |
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| 422 | return 0; |
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| 423 | } |
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| 424 | else |
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| 425 | return 1; |
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| 426 | } |
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| 427 | |
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| 428 | |
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| 429 | /* |
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| 430 | * Replacement for glRastePos3f() which avoids the problem with invalid |
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| 431 | * raster pos. |
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| 432 | */ |
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| 433 | void trRasterPos3f(TRcontext *tr, GLfloat x, GLfloat y, GLfloat z) |
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| 434 | { |
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| 435 | if (tr->CurrentTile<0) { |
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| 436 | /* not doing tile rendering right now. Let OpenGL do this. */ |
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| 437 | glRasterPos3f(x, y, z); |
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| 438 | } |
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| 439 | else { |
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| 440 | GLdouble modelview[16], proj[16]; |
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| 441 | GLint viewport[4]; |
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| 442 | GLdouble winX, winY, winZ; |
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| 443 | |
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| 444 | /* Get modelview, projection and viewport */ |
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| 445 | glGetDoublev(GL_MODELVIEW_MATRIX, modelview); |
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| 446 | glGetDoublev(GL_PROJECTION_MATRIX, proj); |
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| 447 | viewport[0] = 0; |
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| 448 | viewport[1] = 0; |
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| 449 | viewport[2] = tr->CurrentTileWidth; |
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| 450 | viewport[3] = tr->CurrentTileHeight; |
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| 451 | |
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| 452 | /* Project object coord to window coordinate */ |
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| 453 | if (gluProject(x, y, z, modelview, proj, viewport, &winX, &winY, &winZ)){ |
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| 454 | |
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[b49ac56] | 455 | /* set raster pos to window coord (0,0) */ |
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| 456 | glMatrixMode(GL_MODELVIEW); |
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| 457 | glPushMatrix(); |
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| 458 | glLoadIdentity(); |
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| 459 | glMatrixMode(GL_PROJECTION); |
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| 460 | glPushMatrix(); |
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| 461 | glLoadIdentity(); |
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| 462 | glOrtho(0.0, tr->CurrentTileWidth, |
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| 463 | 0.0, tr->CurrentTileHeight, 0.0, 1.0); |
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| 464 | glRasterPos3f(0.0, 0.0, -winZ); |
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| 465 | |
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| 466 | /* Now use empty bitmap to adjust raster position to (winX,winY) */ |
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| 467 | { |
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| 468 | GLubyte bitmap[1] = {0}; |
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| 469 | glBitmap(1, 1, 0.0, 0.0, winX, winY, bitmap); |
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| 470 | } |
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| 471 | |
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| 472 | /* restore original matrices */ |
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| 473 | glPopMatrix(); /*proj*/ |
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| 474 | glMatrixMode(GL_MODELVIEW); |
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| 475 | glPopMatrix(); |
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[46acc71] | 476 | } |
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| 477 | #ifdef DEBUG |
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| 478 | if (glGetError()) |
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[b49ac56] | 479 | printf("GL error!\n"); |
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[46acc71] | 480 | #endif |
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| 481 | } |
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| 482 | } |
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| 483 | |
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