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