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/* $Id: api_eval.c,v 1.1 2003-02-28 11:41:57 pj Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2001 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.
*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
#include "glheader.h"
#include "api_eval.h"
#include "context.h"
#include "macros.h"
#include "mmath.h"
#include "math/m_eval.h"
static void do_EvalCoord1f(GLcontext* ctx, GLfloat u)
{
/** Color Index **/
if (ctx->Eval.Map1Index)
{
GLfloat findex;
struct gl_1d_map *map = &ctx->EvalMap.Map1Index;
GLfloat uu = (u - map->u1) * map->du;
_math_horner_bezier_curve(map->Points, &findex, uu, 1, map->Order);
glIndexi( (GLint) findex );
}
/** Color **/
if (ctx->Eval.Map1Color4) {
GLfloat fcolor[4];
struct gl_1d_map *map = &ctx->EvalMap.Map1Color4;
GLfloat uu = (u - map->u1) * map->du;
_math_horner_bezier_curve(map->Points, fcolor, uu, 4, map->Order);
glColor4fv( fcolor );
}
/** Normal Vector **/
if (ctx->Eval.Map1Normal) {
GLfloat normal[3];
struct gl_1d_map *map = &ctx->EvalMap.Map1Normal;
GLfloat uu = (u - map->u1) * map->du;
_math_horner_bezier_curve(map->Points, normal, uu, 3, map->Order);
glNormal3fv( normal );
}
/** Texture Coordinates **/
if (ctx->Eval.Map1TextureCoord4) {
GLfloat texcoord[4];
struct gl_1d_map *map = &ctx->EvalMap.Map1Texture4;
GLfloat uu = (u - map->u1) * map->du;
_math_horner_bezier_curve(map->Points, texcoord, uu, 4, map->Order);
glTexCoord4fv( texcoord );
}
else if (ctx->Eval.Map1TextureCoord3) {
GLfloat texcoord[4];
struct gl_1d_map *map = &ctx->EvalMap.Map1Texture3;
GLfloat uu = (u - map->u1) * map->du;
_math_horner_bezier_curve(map->Points, texcoord, uu, 3, map->Order);
glTexCoord3fv( texcoord );
}
else if (ctx->Eval.Map1TextureCoord2) {
GLfloat texcoord[4];
struct gl_1d_map *map = &ctx->EvalMap.Map1Texture2;
GLfloat uu = (u - map->u1) * map->du;
_math_horner_bezier_curve(map->Points, texcoord, uu, 2, map->Order);
glTexCoord2fv( texcoord );
}
else if (ctx->Eval.Map1TextureCoord1) {
GLfloat texcoord[4];
struct gl_1d_map *map = &ctx->EvalMap.Map1Texture1;
GLfloat uu = (u - map->u1) * map->du;
_math_horner_bezier_curve(map->Points, texcoord, uu, 1, map->Order);
glTexCoord1fv( texcoord );
}
/** Vertex **/
if (ctx->Eval.Map1Vertex4)
{
GLfloat vertex[4];
struct gl_1d_map *map = &ctx->EvalMap.Map1Vertex4;
GLfloat uu = (u - map->u1) * map->du;
_math_horner_bezier_curve(map->Points, vertex, uu, 4, map->Order);
glVertex4fv( vertex );
}
else if (ctx->Eval.Map1Vertex3)
{
GLfloat vertex[4];
struct gl_1d_map *map = &ctx->EvalMap.Map1Vertex3;
GLfloat uu = (u - map->u1) * map->du;
_math_horner_bezier_curve(map->Points, vertex, uu, 3, map->Order);
glVertex3fv( vertex );
}
}
#define CROSS_PROD(n, u, v) \
(n)[0] = (u)[1]*(v)[2] - (u)[2]*(v)[1]; \
(n)[1] = (u)[2]*(v)[0] - (u)[0]*(v)[2]; \
(n)[2] = (u)[0]*(v)[1] - (u)[1]*(v)[0]
static void do_EvalCoord2f( GLcontext* ctx, GLfloat u, GLfloat v )
{
/** Color Index **/
if (ctx->Eval.Map2Index) {
GLfloat findex;
struct gl_2d_map *map = &ctx->EvalMap.Map2Index;
GLfloat uu = (u - map->u1) * map->du;
GLfloat vv = (v - map->v1) * map->dv;
_math_horner_bezier_surf(map->Points, &findex, uu, vv, 1,
map->Uorder, map->Vorder);
glIndexi( (GLuint) (GLint) findex );
}
/** Color **/
if (ctx->Eval.Map2Color4) {
GLfloat fcolor[4];
struct gl_2d_map *map = &ctx->EvalMap.Map2Color4;
GLfloat uu = (u - map->u1) * map->du;
GLfloat vv = (v - map->v1) * map->dv;
_math_horner_bezier_surf(map->Points, fcolor, uu, vv, 4,
map->Uorder, map->Vorder);
glColor4fv( fcolor );
}
/** Normal **/
if (ctx->Eval.Map2Normal &&
(!ctx->Eval.AutoNormal || (!ctx->Eval.Map2Vertex3 &&
!ctx->Eval.Map2Vertex4))) {
GLfloat normal[3];
struct gl_2d_map *map = &ctx->EvalMap.Map2Normal;
GLfloat uu = (u - map->u1) * map->du;
GLfloat vv = (v - map->v1) * map->dv;
_math_horner_bezier_surf(map->Points, normal, uu, vv, 3,
map->Uorder, map->Vorder);
glNormal3fv( normal );
}
/** Texture Coordinates **/
if (ctx->Eval.Map2TextureCoord4) {
GLfloat texcoord[4];
struct gl_2d_map *map = &ctx->EvalMap.Map2Texture4;
GLfloat uu = (u - map->u1) * map->du;
GLfloat vv = (v - map->v1) * map->dv;
_math_horner_bezier_surf(map->Points, texcoord, uu, vv, 4,
map->Uorder, map->Vorder);
glTexCoord4fv( texcoord );
}
else if (ctx->Eval.Map2TextureCoord3) {
GLfloat texcoord[4];
struct gl_2d_map *map = &ctx->EvalMap.Map2Texture3;
GLfloat uu = (u - map->u1) * map->du;
GLfloat vv = (v - map->v1) * map->dv;
_math_horner_bezier_surf(map->Points, texcoord, uu, vv, 3,
map->Uorder, map->Vorder);
glTexCoord3fv( texcoord );
}
else if (ctx->Eval.Map2TextureCoord2) {
GLfloat texcoord[4];
struct gl_2d_map *map = &ctx->EvalMap.Map2Texture2;
GLfloat uu = (u - map->u1) * map->du;
GLfloat vv = (v - map->v1) * map->dv;
_math_horner_bezier_surf(map->Points, texcoord, uu, vv, 2,
map->Uorder, map->Vorder);
glTexCoord2fv( texcoord );
}
else if (ctx->Eval.Map2TextureCoord1) {
GLfloat texcoord[4];
struct gl_2d_map *map = &ctx->EvalMap.Map2Texture1;
GLfloat uu = (u - map->u1) * map->du;
GLfloat vv = (v - map->v1) * map->dv;
_math_horner_bezier_surf(map->Points, texcoord, uu, vv, 1,
map->Uorder, map->Vorder);
glTexCoord1fv( texcoord );
}
/** Vertex **/
if(ctx->Eval.Map2Vertex4) {
GLfloat vertex[4];
GLfloat normal[3];
struct gl_2d_map *map = &ctx->EvalMap.Map2Vertex4;
GLfloat uu = (u - map->u1) * map->du;
GLfloat vv = (v - map->v1) * map->dv;
if (ctx->Eval.AutoNormal) {
GLfloat du[4], dv[4];
_math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv, 4,
map->Uorder, map->Vorder);
CROSS_PROD(normal, du, dv);
NORMALIZE_3FV(normal);
}
else {
_math_horner_bezier_surf(map->Points, vertex, uu, vv, 4,
map->Uorder, map->Vorder);
}
}
else if (ctx->Eval.Map2Vertex3) {
GLfloat vertex[4];
struct gl_2d_map *map = &ctx->EvalMap.Map2Vertex3;
GLfloat uu = (u - map->u1) * map->du;
GLfloat vv = (v - map->v1) * map->dv;
if (ctx->Eval.AutoNormal) {
GLfloat du[3], dv[3];
GLfloat normal[3];
_math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv, 3,
map->Uorder, map->Vorder);
CROSS_PROD(normal, du, dv);
NORMALIZE_3FV(normal);
glNormal3fv( normal );
glVertex3fv( vertex );
}
else {
_math_horner_bezier_surf(map->Points, vertex, uu, vv, 3,
map->Uorder, map->Vorder);
glVertex3fv( vertex );
}
}
}
void _mesa_EvalPoint1( GLint i )
{
GET_CURRENT_CONTEXT( ctx );
GLfloat du = ((ctx->Eval.MapGrid1u2 - ctx->Eval.MapGrid1u1) /
(GLfloat) ctx->Eval.MapGrid1un);
GLfloat u = i * du + ctx->Eval.MapGrid1u1;
glEvalCoord1f( u );
}
void _mesa_EvalPoint2( GLint i, GLint j )
{
GET_CURRENT_CONTEXT( ctx );
GLfloat du = ((ctx->Eval.MapGrid2u2 - ctx->Eval.MapGrid2u1) /
(GLfloat) ctx->Eval.MapGrid2un);
GLfloat dv = ((ctx->Eval.MapGrid2v2 - ctx->Eval.MapGrid2v1) /
(GLfloat) ctx->Eval.MapGrid2vn);
GLfloat u = i * du + ctx->Eval.MapGrid2u1;
GLfloat v = j * dv + ctx->Eval.MapGrid2v1;
glEvalCoord2f( u, v );
}
/* Wierd thing about eval is that it doesn't affect 'current' values.
* This technique of saving and resetting current values requires
* that:
*
* 1) Current values are updated immediately in the glColor,
* etc. functions.
*
* 2) Hardware color values are stored seperately from ctx->Current,
* for example in dma buffers, or direct emit to registers.
*/
void _mesa_EvalCoord1f( GLfloat u )
{
GET_CURRENT_CONTEXT( ctx );
GLfloat normal[3], texcoord[4], color[4];
GLuint index;
COPY_3FV( normal, ctx->Current.Attrib[VERT_ATTRIB_NORMAL] );
COPY_4FV( texcoord, ctx->Current.Attrib[VERT_ATTRIB_TEX0] );
COPY_4FV( color, ctx->Current.Attrib[VERT_ATTRIB_COLOR0] );
index = ctx->Current.Index;
do_EvalCoord1f( ctx, u );
COPY_3FV( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], normal );
COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_TEX0], texcoord );
COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color );
ctx->Current.Index = index;
}
void _mesa_EvalCoord2f( GLfloat u, GLfloat v )
{
GET_CURRENT_CONTEXT( ctx );
GLfloat normal[3], texcoord[4], color[4];
GLuint index;
COPY_3FV( normal, ctx->Current.Attrib[VERT_ATTRIB_NORMAL] );
COPY_4FV( texcoord, ctx->Current.Attrib[VERT_ATTRIB_TEX0] );
COPY_4FV( color, ctx->Current.Attrib[VERT_ATTRIB_COLOR0] );
index = ctx->Current.Index;
do_EvalCoord2f( ctx, u, v );
COPY_3FV( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], normal );
COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_TEX0], texcoord );
COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color );
ctx->Current.Index = index;
}
void _mesa_EvalCoord1fv( const GLfloat *u )
{
glEvalCoord1f( u[0] );
}
void _mesa_EvalCoord2fv( const GLfloat *u )
{
glEvalCoord2f( u[0], u[1] );
}