| 1 | /* $Id: xform.h,v 1.3 2000-05-23 20:35:00 jeroen Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Mesa 3-D graphics library
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| 5 | * Version: 3.3
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| 6 | *
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| 7 | * Copyright (C) 1999 Brian Paul All Rights Reserved.
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| 8 | *
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a
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| 10 | * copy of this software and associated documentation files (the "Software"),
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| 11 | * to deal in the Software without restriction, including without limitation
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the
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| 14 | * Software is furnished to do so, subject to the following conditions:
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| 15 | *
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| 16 | * The above copyright notice and this permission notice shall be included
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| 17 | * in all copies or substantial portions of the Software.
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| 18 | *
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 25 | */
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| 31 | #ifndef XFORM_H
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| 32 | #define XFORM_H
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| 33 |
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| 34 |
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| 35 | #include "types.h"
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| 36 |
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| 37 | #ifdef USE_X86_ASM
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| 38 | #define _XFORMAPI _ASMAPI
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| 39 | #define _XFORMAPIP _ASMAPIP
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| 40 | #else
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| 41 | #define _XFORMAPI
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| 42 | #define _XFORMAPIP *
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| 43 | #endif
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| 44 |
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| 45 | /*
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| 46 | * Transform a point (column vector) by a matrix: Q = M * P
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| 47 | */
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| 48 | #define TRANSFORM_POINT( Q, M, P ) \
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| 49 | Q[0] = M[0] * P[0] + M[4] * P[1] + M[8] * P[2] + M[12] * P[3]; \
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| 50 | Q[1] = M[1] * P[0] + M[5] * P[1] + M[9] * P[2] + M[13] * P[3]; \
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| 51 | Q[2] = M[2] * P[0] + M[6] * P[1] + M[10] * P[2] + M[14] * P[3]; \
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| 52 | Q[3] = M[3] * P[0] + M[7] * P[1] + M[11] * P[2] + M[15] * P[3];
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| 53 |
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| 54 |
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| 55 | #define TRANSFORM_POINT3( Q, M, P ) \
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| 56 | Q[0] = M[0] * P[0] + M[4] * P[1] + M[8] * P[2] + M[12]; \
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| 57 | Q[1] = M[1] * P[0] + M[5] * P[1] + M[9] * P[2] + M[13]; \
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| 58 | Q[2] = M[2] * P[0] + M[6] * P[1] + M[10] * P[2] + M[14]; \
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| 59 | Q[3] = M[3] * P[0] + M[7] * P[1] + M[11] * P[2] + M[15];
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| 60 |
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| 61 |
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| 62 | /*
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| 63 | * Transform a normal (row vector) by a matrix: [NX NY NZ] = N * MAT
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| 64 | */
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| 65 | #define TRANSFORM_NORMAL( TO, N, MAT ) \
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| 66 | do { \
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| 67 | TO[0] = N[0] * MAT[0] + N[1] * MAT[1] + N[2] * MAT[2]; \
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| 68 | TO[1] = N[0] * MAT[4] + N[1] * MAT[5] + N[2] * MAT[6]; \
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| 69 | TO[2] = N[0] * MAT[8] + N[1] * MAT[9] + N[2] * MAT[10]; \
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| 70 | } while (0)
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| 71 |
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| 72 |
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| 73 | extern void gl_transform_vector( GLfloat u[4],
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| 74 | const GLfloat v[4],
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| 75 | const GLfloat m[16] );
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| 76 |
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| 77 |
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| 78 | extern void gl_init_transformation( void );
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| 79 |
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| 80 |
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| 81 | /* KW: Clip functions now do projective divide as well. The projected
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| 82 | * coordinates are very useful to us because they let us cull
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| 83 | * backfaces and eliminate vertices from lighting, fogging, etc
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| 84 | * calculations. Despite the fact that this divide could be done one
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| 85 | * day in hardware, we would still have a reason to want to do it here
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| 86 | * as long as those other calculations remain in software.
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| 87 | *
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| 88 | * Clipping is a convenient place to do the divide on x86 as it should be
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| 89 | * possible to overlap with integer outcode calculations.
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| 90 | *
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| 91 | * There are two cases where we wouldn't want to do the divide in cliptest:
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| 92 | * - When we aren't clipping. We still might want to cull backfaces
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| 93 | * so the divide should be done elsewhere. This currently never
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| 94 | * happens.
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| 95 | *
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| 96 | * - When culling isn't likely to help us, such as when the GL culling
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| 97 | * is disabled and we not lighting or are only lighting
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| 98 | * one-sided. In this situation, backface determination provides
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| 99 | * us with no useful information. A tricky case to detect is when
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| 100 | * all input data is already culled, although hopefully the
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| 101 | * application wouldn't turn on culling in such cases.
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| 102 | *
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| 103 | * We supply a buffer to hold the [x/w,y/w,z/w,1/w] values which
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| 104 | * are the result of the projection. This is only used in the
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| 105 | * 4-vector case - in other cases, we just use the clip coordinates
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| 106 | * as the projected coordinates - they are identical.
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| 107 | *
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| 108 | * This is doubly convenient because it means the Win[] array is now
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| 109 | * of the same stride as all the others, so I can now turn map_vertices
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| 110 | * into a straight-forward matrix transformation, with asm acceleration
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| 111 | * automatically available.
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| 112 | */
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| 113 | typedef GLvector4f * (_XFORMAPIP clip_func)( GLvector4f *vClip,
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| 114 | GLvector4f *vProj,
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| 115 | GLubyte clipMask[],
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| 116 | GLubyte *orMask,
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| 117 | GLubyte *andMask );
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| 118 |
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| 119 | typedef void (*dotprod_func)( GLvector4f *out_vec,
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| 120 | GLuint elt,
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| 121 | const GLvector4f *coord_vec,
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| 122 | const GLfloat plane[4],
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| 123 | const GLubyte mask[]);
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| 124 |
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| 125 | typedef void (*vec_copy_func)( GLvector4f *to,
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| 126 | const GLvector4f *from,
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| 127 | const GLubyte mask[]);
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| 128 |
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| 129 |
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| 130 |
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| 131 |
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| 132 | /* KW: New versions of the transform function allow a mask array
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| 133 | * specifying that individual vector transform should be skipped
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| 134 | * when the mask byte is zero. This is always present as a
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| 135 | * parameter, to allow a unified interface.
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| 136 | */
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| 137 | typedef void (_XFORMAPIP transform_func)( GLvector4f *to_vec,
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| 138 | const GLmatrix *mat,
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| 139 | const GLvector4f *from_vec,
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| 140 | const GLubyte *clipmask,
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| 141 | const GLubyte flag );
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| 142 |
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| 143 |
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| 144 | extern GLvector4f *gl_project_points( GLvector4f *to,
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| 145 | const GLvector4f *from );
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| 146 |
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| 147 | extern void gl_transform_bounds3( GLubyte *orMask, GLubyte *andMask,
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| 148 | const GLmatrix *mat,
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| 149 | CONST GLfloat src[][3] );
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| 150 |
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| 151 | extern void gl_transform_bounds2( GLubyte *orMask, GLubyte *andMask,
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| 152 | const GLmatrix *mat,
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| 153 | CONST GLfloat src[][3] );
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| 154 |
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| 155 |
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| 156 | extern dotprod_func gl_dotprod_tab[2][5];
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| 157 | extern vec_copy_func gl_copy_tab[2][0x10];
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| 158 | extern clip_func gl_clip_tab[5];
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| 159 | extern normal_func gl_normal_tab[0xf][0x4];
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| 160 |
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| 161 | /* Use of 3 layers of linked 1-dimensional arrays to reduce
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| 162 | * cost of lookup.
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| 163 | */
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| 164 | extern transform_func **(gl_transform_tab[2]);
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| 165 |
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| 166 |
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| 167 | extern void gl_transform_point_sz( GLfloat Q[4], const GLfloat M[16],
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| 168 | const GLfloat P[4], GLuint sz );
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| 169 |
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| 170 |
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| 171 | #define TransformRaw( to, mat, from ) \
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| 172 | ( (*gl_transform_tab[0][(from)->size][(mat)->type])( to, mat, from, 0, 0 ), \
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| 173 | (to) )
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| 174 |
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| 175 | #define Transform( to, mat, from, mask, cull ) \
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| 176 | ( (*gl_transform_tab[cull!=0][(from)->size][(mat)->type])( to, mat, from, mask, cull ), \
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| 177 | (to) )
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| 178 |
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| 179 |
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| 180 | #endif
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