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https://github.com/reactos/reactos.git
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391 lines
11 KiB
C
391 lines
11 KiB
C
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/*
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* Mesa 3-D graphics library
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* Version: 5.1
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*
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* Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* New (3.1) transformation code written by Keith Whitwell.
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*/
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/* Functions to tranform a vector of normals. This includes applying
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* the transformation matrix, rescaling and normalization.
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*/
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/*
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* mat - the 4x4 transformation matrix
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* scale - uniform scale factor of the transformation matrix (not always used)
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* in - the source vector of normals
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* lengths - length of each incoming normal (may be NULL) (a display list
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* optimization)
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* dest - the destination vector of normals
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*/
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static void _XFORMAPI
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TAG(transform_normalize_normals)( const GLmatrix *mat,
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GLfloat scale,
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const GLvector4f *in,
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const GLfloat *lengths,
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GLvector4f *dest )
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{
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GLfloat (*out)[4] = (GLfloat (*)[4])dest->start;
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const GLfloat *from = in->start;
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const GLuint stride = in->stride;
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const GLuint count = in->count;
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const GLfloat *m = mat->inv;
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GLfloat m0 = m[0], m4 = m[4], m8 = m[8];
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GLfloat m1 = m[1], m5 = m[5], m9 = m[9];
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GLfloat m2 = m[2], m6 = m[6], m10 = m[10];
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GLuint i;
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if (!lengths) {
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STRIDE_LOOP {
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GLfloat tx, ty, tz;
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{
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const GLfloat ux = from[0], uy = from[1], uz = from[2];
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tx = ux * m0 + uy * m1 + uz * m2;
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ty = ux * m4 + uy * m5 + uz * m6;
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tz = ux * m8 + uy * m9 + uz * m10;
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}
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{
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GLdouble len = tx*tx + ty*ty + tz*tz;
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if (len > 1e-20) {
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GLfloat scale = INV_SQRTF(len);
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out[i][0] = tx * scale;
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out[i][1] = ty * scale;
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out[i][2] = tz * scale;
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}
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else {
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out[i][0] = out[i][1] = out[i][2] = 0;
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}
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}
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}
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}
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else {
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if (scale != 1.0) {
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m0 *= scale, m4 *= scale, m8 *= scale;
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m1 *= scale, m5 *= scale, m9 *= scale;
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m2 *= scale, m6 *= scale, m10 *= scale;
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}
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STRIDE_LOOP {
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GLfloat tx, ty, tz;
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{
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const GLfloat ux = from[0], uy = from[1], uz = from[2];
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tx = ux * m0 + uy * m1 + uz * m2;
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ty = ux * m4 + uy * m5 + uz * m6;
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tz = ux * m8 + uy * m9 + uz * m10;
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}
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{
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GLfloat len = lengths[i];
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out[i][0] = tx * len;
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out[i][1] = ty * len;
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out[i][2] = tz * len;
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}
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}
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}
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dest->count = in->count;
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}
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static void _XFORMAPI
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TAG(transform_normalize_normals_no_rot)( const GLmatrix *mat,
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GLfloat scale,
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const GLvector4f *in,
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const GLfloat *lengths,
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GLvector4f *dest )
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{
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GLfloat (*out)[4] = (GLfloat (*)[4])dest->start;
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const GLfloat *from = in->start;
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const GLuint stride = in->stride;
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const GLuint count = in->count;
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const GLfloat *m = mat->inv;
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GLfloat m0 = m[0];
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GLfloat m5 = m[5];
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GLfloat m10 = m[10];
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GLuint i;
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if (!lengths) {
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STRIDE_LOOP {
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GLfloat tx, ty, tz;
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{
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const GLfloat ux = from[0], uy = from[1], uz = from[2];
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tx = ux * m0 ;
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ty = uy * m5 ;
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tz = uz * m10;
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}
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{
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GLdouble len = tx*tx + ty*ty + tz*tz;
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if (len > 1e-20) {
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GLfloat scale = INV_SQRTF(len);
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out[i][0] = tx * scale;
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out[i][1] = ty * scale;
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out[i][2] = tz * scale;
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}
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else {
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out[i][0] = out[i][1] = out[i][2] = 0;
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}
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}
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}
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}
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else {
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m0 *= scale;
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m5 *= scale;
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m10 *= scale;
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STRIDE_LOOP {
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GLfloat tx, ty, tz;
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{
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const GLfloat ux = from[0], uy = from[1], uz = from[2];
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tx = ux * m0 ;
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ty = uy * m5 ;
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tz = uz * m10;
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}
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{
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GLfloat len = lengths[i];
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out[i][0] = tx * len;
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out[i][1] = ty * len;
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out[i][2] = tz * len;
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}
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}
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}
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dest->count = in->count;
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}
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static void _XFORMAPI
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TAG(transform_rescale_normals_no_rot)( const GLmatrix *mat,
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GLfloat scale,
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const GLvector4f *in,
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const GLfloat *lengths,
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GLvector4f *dest )
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{
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GLfloat (*out)[4] = (GLfloat (*)[4])dest->start;
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const GLfloat *from = in->start;
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const GLuint stride = in->stride;
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const GLuint count = in->count;
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const GLfloat *m = mat->inv;
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const GLfloat m0 = scale*m[0];
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const GLfloat m5 = scale*m[5];
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const GLfloat m10 = scale*m[10];
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GLuint i;
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(void) lengths;
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STRIDE_LOOP {
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GLfloat ux = from[0], uy = from[1], uz = from[2];
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out[i][0] = ux * m0;
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out[i][1] = uy * m5;
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out[i][2] = uz * m10;
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}
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dest->count = in->count;
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}
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static void _XFORMAPI
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TAG(transform_rescale_normals)( const GLmatrix *mat,
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GLfloat scale,
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const GLvector4f *in,
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const GLfloat *lengths,
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GLvector4f *dest )
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{
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GLfloat (*out)[4] = (GLfloat (*)[4])dest->start;
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const GLfloat *from = in->start;
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const GLuint stride = in->stride;
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const GLuint count = in->count;
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/* Since we are unlikely to have < 3 vertices in the buffer,
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* it makes sense to pre-multiply by scale.
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*/
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const GLfloat *m = mat->inv;
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const GLfloat m0 = scale*m[0], m4 = scale*m[4], m8 = scale*m[8];
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const GLfloat m1 = scale*m[1], m5 = scale*m[5], m9 = scale*m[9];
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const GLfloat m2 = scale*m[2], m6 = scale*m[6], m10 = scale*m[10];
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GLuint i;
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(void) lengths;
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STRIDE_LOOP {
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GLfloat ux = from[0], uy = from[1], uz = from[2];
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out[i][0] = ux * m0 + uy * m1 + uz * m2;
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out[i][1] = ux * m4 + uy * m5 + uz * m6;
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out[i][2] = ux * m8 + uy * m9 + uz * m10;
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}
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dest->count = in->count;
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}
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static void _XFORMAPI
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TAG(transform_normals_no_rot)( const GLmatrix *mat,
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GLfloat scale,
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const GLvector4f *in,
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const GLfloat *lengths,
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GLvector4f *dest )
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{
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GLfloat (*out)[4] = (GLfloat (*)[4])dest->start;
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const GLfloat *from = in->start;
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const GLuint stride = in->stride;
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const GLuint count = in->count;
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const GLfloat *m = mat->inv;
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const GLfloat m0 = m[0];
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const GLfloat m5 = m[5];
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const GLfloat m10 = m[10];
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GLuint i;
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(void) scale;
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(void) lengths;
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STRIDE_LOOP {
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GLfloat ux = from[0], uy = from[1], uz = from[2];
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out[i][0] = ux * m0;
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out[i][1] = uy * m5;
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out[i][2] = uz * m10;
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}
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dest->count = in->count;
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}
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static void _XFORMAPI
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TAG(transform_normals)( const GLmatrix *mat,
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GLfloat scale,
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const GLvector4f *in,
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const GLfloat *lengths,
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GLvector4f *dest )
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{
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GLfloat (*out)[4] = (GLfloat (*)[4])dest->start;
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const GLfloat *from = in->start;
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const GLuint stride = in->stride;
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const GLuint count = in->count;
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const GLfloat *m = mat->inv;
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const GLfloat m0 = m[0], m4 = m[4], m8 = m[8];
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const GLfloat m1 = m[1], m5 = m[5], m9 = m[9];
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const GLfloat m2 = m[2], m6 = m[6], m10 = m[10];
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GLuint i;
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(void) scale;
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(void) lengths;
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STRIDE_LOOP {
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GLfloat ux = from[0], uy = from[1], uz = from[2];
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out[i][0] = ux * m0 + uy * m1 + uz * m2;
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out[i][1] = ux * m4 + uy * m5 + uz * m6;
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out[i][2] = ux * m8 + uy * m9 + uz * m10;
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}
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dest->count = in->count;
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}
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static void _XFORMAPI
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TAG(normalize_normals)( const GLmatrix *mat,
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GLfloat scale,
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const GLvector4f *in,
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const GLfloat *lengths,
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GLvector4f *dest )
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{
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GLfloat (*out)[4] = (GLfloat (*)[4])dest->start;
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const GLfloat *from = in->start;
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const GLuint stride = in->stride;
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const GLuint count = in->count;
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GLuint i;
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(void) mat;
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(void) scale;
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if (lengths) {
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STRIDE_LOOP {
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const GLfloat x = from[0], y = from[1], z = from[2];
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GLfloat invlen = lengths[i];
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out[i][0] = x * invlen;
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out[i][1] = y * invlen;
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out[i][2] = z * invlen;
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}
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}
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else {
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STRIDE_LOOP {
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const GLfloat x = from[0], y = from[1], z = from[2];
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GLdouble len = x * x + y * y + z * z;
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if (len > 1e-50) {
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len = INV_SQRTF(len);
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out[i][0] = (GLfloat)(x * len);
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out[i][1] = (GLfloat)(y * len);
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out[i][2] = (GLfloat)(z * len);
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}
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else {
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out[i][0] = x;
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out[i][1] = y;
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out[i][2] = z;
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}
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}
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}
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dest->count = in->count;
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}
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static void _XFORMAPI
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TAG(rescale_normals)( const GLmatrix *mat,
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GLfloat scale,
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const GLvector4f *in,
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const GLfloat *lengths,
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GLvector4f *dest )
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{
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GLfloat (*out)[4] = (GLfloat (*)[4])dest->start;
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const GLfloat *from = in->start;
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const GLuint stride = in->stride;
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const GLuint count = in->count;
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GLuint i;
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(void) mat;
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(void) lengths;
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STRIDE_LOOP {
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SCALE_SCALAR_3V( out[i], scale, from );
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}
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dest->count = in->count;
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}
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static void _XFORMAPI
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TAG(init_c_norm_transform)( void )
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{
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_mesa_normal_tab[NORM_TRANSFORM_NO_ROT] =
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TAG(transform_normals_no_rot);
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_mesa_normal_tab[NORM_TRANSFORM_NO_ROT | NORM_RESCALE] =
|
||
|
|
TAG(transform_rescale_normals_no_rot);
|
||
|
|
|
||
|
|
_mesa_normal_tab[NORM_TRANSFORM_NO_ROT | NORM_NORMALIZE] =
|
||
|
|
TAG(transform_normalize_normals_no_rot);
|
||
|
|
|
||
|
|
_mesa_normal_tab[NORM_TRANSFORM] =
|
||
|
|
TAG(transform_normals);
|
||
|
|
|
||
|
|
_mesa_normal_tab[NORM_TRANSFORM | NORM_RESCALE] =
|
||
|
|
TAG(transform_rescale_normals);
|
||
|
|
|
||
|
|
_mesa_normal_tab[NORM_TRANSFORM | NORM_NORMALIZE] =
|
||
|
|
TAG(transform_normalize_normals);
|
||
|
|
|
||
|
|
_mesa_normal_tab[NORM_RESCALE] =
|
||
|
|
TAG(rescale_normals);
|
||
|
|
|
||
|
|
_mesa_normal_tab[NORM_NORMALIZE] =
|
||
|
|
TAG(normalize_normals);
|
||
|
|
}
|