721 lines
16 KiB
C
721 lines
16 KiB
C
/* $Id: rastpos.c,v 1.26 2001/06/18 17:26:08 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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* Version: 3.5
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*
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* Copyright (C) 1999-2001 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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#ifdef PC_HEADER
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#include "all.h"
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#else
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#include "glheader.h"
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#include "clip.h"
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#include "colormac.h"
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#include "context.h"
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#include "feedback.h"
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#include "light.h"
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#include "macros.h"
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#include "mmath.h"
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#include "rastpos.h"
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#include "state.h"
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#include "simple_list.h"
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#include "mtypes.h"
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#include "math/m_matrix.h"
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#include "math/m_xform.h"
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#endif
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/*
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* Clip a point against the view volume.
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* Input: v - vertex-vector describing the point to clip
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* Return: 0 = outside view volume
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* 1 = inside view volume
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*/
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static GLuint
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viewclip_point( const GLfloat v[] )
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{
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if ( v[0] > v[3] || v[0] < -v[3]
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|| v[1] > v[3] || v[1] < -v[3]
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|| v[2] > v[3] || v[2] < -v[3] ) {
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return 0;
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}
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else {
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return 1;
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}
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}
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/*
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* Clip a point against the user clipping planes.
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* Input: v - vertex-vector describing the point to clip.
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* Return: 0 = point was clipped
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* 1 = point not clipped
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*/
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static GLuint
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userclip_point( GLcontext* ctx, const GLfloat v[] )
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{
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GLuint p;
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for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
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if (ctx->Transform.ClipEnabled[p]) {
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GLfloat dot = v[0] * ctx->Transform._ClipUserPlane[p][0]
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+ v[1] * ctx->Transform._ClipUserPlane[p][1]
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+ v[2] * ctx->Transform._ClipUserPlane[p][2]
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+ v[3] * ctx->Transform._ClipUserPlane[p][3];
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if (dot < 0.0F) {
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return 0;
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}
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}
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}
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return 1;
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}
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/* This has been split off to allow the normal shade routines to
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* get a little closer to the vertex buffer, and to use the
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* GLvector objects directly.
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*/
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static void
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shade_rastpos(GLcontext *ctx,
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const GLfloat vertex[4],
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const GLfloat normal[3],
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GLfloat Rcolor[4],
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GLuint *index)
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{
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GLfloat (*base)[3] = ctx->Light._BaseColor;
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const GLfloat *sumA = ctx->Light._BaseAlpha;
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struct gl_light *light;
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GLfloat color[4];
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GLfloat diffuse = 0, specular = 0;
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COPY_3V(color, base[0]);
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color[3] = sumA[0];
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foreach (light, &ctx->Light.EnabledList) {
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GLfloat n_dot_h;
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GLfloat attenuation = 1.0;
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GLfloat VP[3];
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GLfloat n_dot_VP;
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GLfloat *h;
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GLfloat contrib[3];
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GLboolean normalized;
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if (!(light->_Flags & LIGHT_POSITIONAL)) {
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COPY_3V(VP, light->_VP_inf_norm);
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attenuation = light->_VP_inf_spot_attenuation;
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}
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else {
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GLfloat d;
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SUB_3V(VP, light->_Position, vertex);
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d = LEN_3FV( VP );
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if ( d > 1e-6) {
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GLfloat invd = 1.0F / d;
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SELF_SCALE_SCALAR_3V(VP, invd);
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}
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attenuation = 1.0F / (light->ConstantAttenuation + d *
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(light->LinearAttenuation + d *
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light->QuadraticAttenuation));
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if (light->_Flags & LIGHT_SPOT) {
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GLfloat PV_dot_dir = - DOT3(VP, light->_NormDirection);
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if (PV_dot_dir<light->_CosCutoff) {
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continue;
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}
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else {
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double x = PV_dot_dir * (EXP_TABLE_SIZE-1);
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int k = (int) x;
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GLfloat spot = (GLfloat) (light->_SpotExpTable[k][0]
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+ (x-k)*light->_SpotExpTable[k][1]);
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attenuation *= spot;
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}
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}
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}
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if (attenuation < 1e-3)
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continue;
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n_dot_VP = DOT3( normal, VP );
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if (n_dot_VP < 0.0F) {
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ACC_SCALE_SCALAR_3V(color, attenuation, light->_MatAmbient[0]);
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continue;
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}
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COPY_3V(contrib, light->_MatAmbient[0]);
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ACC_SCALE_SCALAR_3V(contrib, n_dot_VP, light->_MatDiffuse[0]);
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diffuse += n_dot_VP * light->_dli * attenuation;
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{
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if (ctx->Light.Model.LocalViewer) {
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GLfloat v[3];
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COPY_3V(v, vertex);
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NORMALIZE_3FV(v);
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SUB_3V(VP, VP, v);
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h = VP;
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normalized = 0;
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}
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else if (light->_Flags & LIGHT_POSITIONAL) {
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h = VP;
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ACC_3V(h, ctx->_EyeZDir);
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normalized = 0;
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}
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else {
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h = light->_h_inf_norm;
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normalized = 1;
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}
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n_dot_h = DOT3(normal, h);
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if (n_dot_h > 0.0F) {
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struct gl_material *mat = &ctx->Light.Material[0];
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GLfloat spec_coef;
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GLfloat shininess = mat->Shininess;
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if (!normalized) {
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n_dot_h *= n_dot_h;
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n_dot_h /= LEN_SQUARED_3FV( h );
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shininess *= .5;
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}
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GET_SHINE_TAB_ENTRY( ctx->_ShineTable[0], n_dot_h, spec_coef );
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if (spec_coef > 1.0e-10) {
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ACC_SCALE_SCALAR_3V( contrib, spec_coef,
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light->_MatSpecular[0]);
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specular += spec_coef * light->_sli * attenuation;
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}
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}
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}
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ACC_SCALE_SCALAR_3V( color, attenuation, contrib );
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}
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if (ctx->Visual.rgbMode) {
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Rcolor[0] = CLAMP(color[0], 0.0F, 1.0F);
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Rcolor[1] = CLAMP(color[1], 0.0F, 1.0F);
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Rcolor[2] = CLAMP(color[2], 0.0F, 1.0F);
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Rcolor[3] = CLAMP(color[3], 0.0F, 1.0F);
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}
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else {
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struct gl_material *mat = &ctx->Light.Material[0];
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GLfloat d_a = mat->DiffuseIndex - mat->AmbientIndex;
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GLfloat s_a = mat->SpecularIndex - mat->AmbientIndex;
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GLfloat ind = mat->AmbientIndex
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+ diffuse * (1.0F-specular) * d_a
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+ specular * s_a;
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if (ind > mat->SpecularIndex) {
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ind = mat->SpecularIndex;
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}
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*index = (GLuint) (GLint) ind;
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}
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}
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/*
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* Caller: context->API.RasterPos4f
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*/
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static void
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raster_pos4f(GLcontext *ctx, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
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{
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GLfloat v[4], eye[4], clip[4], ndc[3], d;
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ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
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FLUSH_CURRENT(ctx, 0);
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if (ctx->NewState)
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_mesa_update_state( ctx );
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ASSIGN_4V( v, x, y, z, w );
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TRANSFORM_POINT( eye, ctx->ModelView.m, v );
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/* raster color */
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if (ctx->Light.Enabled) {
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GLfloat *norm, eyenorm[3];
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GLfloat *objnorm = ctx->Current.Normal;
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if (ctx->_NeedEyeCoords) {
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GLfloat *inv = ctx->ModelView.inv;
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TRANSFORM_NORMAL( eyenorm, objnorm, inv );
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norm = eyenorm;
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}
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else {
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norm = objnorm;
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}
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shade_rastpos( ctx, v, norm,
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ctx->Current.RasterColor,
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&ctx->Current.RasterIndex );
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}
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else {
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/* use current color or index */
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if (ctx->Visual.rgbMode) {
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ctx->Current.RasterColor[0] = (ctx->Current.Color[0]);
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ctx->Current.RasterColor[1] = (ctx->Current.Color[1]);
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ctx->Current.RasterColor[2] = (ctx->Current.Color[2]);
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ctx->Current.RasterColor[3] = (ctx->Current.Color[3]);
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}
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else {
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ctx->Current.RasterIndex = ctx->Current.Index;
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}
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}
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/* compute raster distance */
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ctx->Current.RasterDistance = (GLfloat)
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GL_SQRT( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );
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/* apply projection matrix: clip = Proj * eye */
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TRANSFORM_POINT( clip, ctx->ProjectionMatrix.m, eye );
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/* clip to view volume */
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if (viewclip_point( clip )==0) {
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ctx->Current.RasterPosValid = GL_FALSE;
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return;
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}
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/* clip to user clipping planes */
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if (ctx->Transform._AnyClip &&
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userclip_point(ctx, clip) == 0) {
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ctx->Current.RasterPosValid = GL_FALSE;
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return;
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}
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/* ndc = clip / W */
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ASSERT( clip[3]!=0.0 );
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d = 1.0F / clip[3];
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ndc[0] = clip[0] * d;
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ndc[1] = clip[1] * d;
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ndc[2] = clip[2] * d;
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ctx->Current.RasterPos[0] = (ndc[0] * ctx->Viewport._WindowMap.m[MAT_SX] +
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ctx->Viewport._WindowMap.m[MAT_TX]);
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ctx->Current.RasterPos[1] = (ndc[1] * ctx->Viewport._WindowMap.m[MAT_SY] +
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ctx->Viewport._WindowMap.m[MAT_TY]);
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ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport._WindowMap.m[MAT_SZ] +
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ctx->Viewport._WindowMap.m[MAT_TZ]) / ctx->DepthMaxF;
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ctx->Current.RasterPos[3] = clip[3];
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ctx->Current.RasterPosValid = GL_TRUE;
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ctx->Current.RasterFogCoord = ctx->Current.FogCoord;
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{
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GLuint texSet;
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for (texSet = 0; texSet < ctx->Const.MaxTextureUnits; texSet++) {
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COPY_4FV( ctx->Current.RasterMultiTexCoord[texSet],
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ctx->Current.Texcoord[texSet] );
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}
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}
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if (ctx->RenderMode==GL_SELECT) {
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_mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
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}
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}
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void
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_mesa_RasterPos2d(GLdouble x, GLdouble y)
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{
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_mesa_RasterPos4f(x, y, 0.0F, 1.0F);
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}
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void
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_mesa_RasterPos2f(GLfloat x, GLfloat y)
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{
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_mesa_RasterPos4f(x, y, 0.0F, 1.0F);
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}
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void
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_mesa_RasterPos2i(GLint x, GLint y)
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{
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_mesa_RasterPos4f(x, y, 0.0F, 1.0F);
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}
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void
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_mesa_RasterPos2s(GLshort x, GLshort y)
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{
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_mesa_RasterPos4f(x, y, 0.0F, 1.0F);
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}
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void
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_mesa_RasterPos3d(GLdouble x, GLdouble y, GLdouble z)
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{
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_mesa_RasterPos4f(x, y, z, 1.0F);
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}
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void
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_mesa_RasterPos3f(GLfloat x, GLfloat y, GLfloat z)
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{
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_mesa_RasterPos4f(x, y, z, 1.0F);
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}
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void
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_mesa_RasterPos3i(GLint x, GLint y, GLint z)
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{
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_mesa_RasterPos4f(x, y, z, 1.0F);
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}
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void
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_mesa_RasterPos3s(GLshort x, GLshort y, GLshort z)
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{
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_mesa_RasterPos4f(x, y, z, 1.0F);
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}
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void
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_mesa_RasterPos4d(GLdouble x, GLdouble y, GLdouble z, GLdouble w)
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{
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_mesa_RasterPos4f(x, y, z, w);
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}
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void
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_mesa_RasterPos4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
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{
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GET_CURRENT_CONTEXT(ctx);
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raster_pos4f(ctx, x, y, z, w);
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}
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void
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_mesa_RasterPos4i(GLint x, GLint y, GLint z, GLint w)
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{
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_mesa_RasterPos4f(x, y, z, w);
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}
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void
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_mesa_RasterPos4s(GLshort x, GLshort y, GLshort z, GLshort w)
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{
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_mesa_RasterPos4f(x, y, z, w);
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}
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void
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_mesa_RasterPos2dv(const GLdouble *v)
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{
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_mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
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}
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void
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_mesa_RasterPos2fv(const GLfloat *v)
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{
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_mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
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}
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void
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_mesa_RasterPos2iv(const GLint *v)
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{
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_mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
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}
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void
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_mesa_RasterPos2sv(const GLshort *v)
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{
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_mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
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}
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void
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_mesa_RasterPos3dv(const GLdouble *v)
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{
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_mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
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}
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void
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_mesa_RasterPos3fv(const GLfloat *v)
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{
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_mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
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}
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void
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_mesa_RasterPos3iv(const GLint *v)
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{
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_mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
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}
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void
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_mesa_RasterPos3sv(const GLshort *v)
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{
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_mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
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}
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void
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_mesa_RasterPos4dv(const GLdouble *v)
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{
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_mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
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}
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void
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_mesa_RasterPos4fv(const GLfloat *v)
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{
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_mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
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}
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void
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_mesa_RasterPos4iv(const GLint *v)
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{
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_mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
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}
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void
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_mesa_RasterPos4sv(const GLshort *v)
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{
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_mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
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}
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/**********************************************************************/
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/*** GL_MESA_window_pos ***/
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/**********************************************************************/
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/*
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* This is a MESA extension function. Pretty much just like glRasterPos
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* except we don't apply the modelview or projection matrices; specify a
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* window coordinate directly.
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* Caller: context->API.WindowPos4fMESA pointer.
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*/
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void
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_mesa_WindowPos4fMESA( GLfloat x, GLfloat y, GLfloat z, GLfloat w )
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
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FLUSH_CURRENT(ctx, 0);
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/* set raster position */
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ctx->Current.RasterPos[0] = x;
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ctx->Current.RasterPos[1] = y;
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ctx->Current.RasterPos[2] = CLAMP( z, 0.0F, 1.0F );
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ctx->Current.RasterPos[3] = w;
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|
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ctx->Current.RasterPosValid = GL_TRUE;
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ctx->Current.RasterDistance = 0.0F;
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ctx->Current.RasterFogCoord = 0.0F;
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|
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/* raster color = current color or index */
|
|
if (ctx->Visual.rgbMode) {
|
|
ctx->Current.RasterColor[0] = (ctx->Current.Color[0]);
|
|
ctx->Current.RasterColor[1] = (ctx->Current.Color[1]);
|
|
ctx->Current.RasterColor[2] = (ctx->Current.Color[2]);
|
|
ctx->Current.RasterColor[3] = (ctx->Current.Color[3]);
|
|
}
|
|
else {
|
|
ctx->Current.RasterIndex = ctx->Current.Index;
|
|
}
|
|
|
|
/* raster texcoord = current texcoord */
|
|
{
|
|
GLuint texSet;
|
|
for (texSet = 0; texSet < ctx->Const.MaxTextureUnits; texSet++) {
|
|
COPY_4FV( ctx->Current.RasterMultiTexCoord[texSet],
|
|
ctx->Current.Texcoord[texSet] );
|
|
}
|
|
}
|
|
|
|
if (ctx->RenderMode==GL_SELECT) {
|
|
_mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
_mesa_WindowPos2dMESA(GLdouble x, GLdouble y)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, 0.0F, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos2fMESA(GLfloat x, GLfloat y)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, 0.0F, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos2iMESA(GLint x, GLint y)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, 0.0F, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos2sMESA(GLshort x, GLshort y)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, 0.0F, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos3dMESA(GLdouble x, GLdouble y, GLdouble z)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, z, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos3fMESA(GLfloat x, GLfloat y, GLfloat z)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, z, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos3iMESA(GLint x, GLint y, GLint z)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, z, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos3sMESA(GLshort x, GLshort y, GLshort z)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, z, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos4dMESA(GLdouble x, GLdouble y, GLdouble z, GLdouble w)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, z, w);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos4iMESA(GLint x, GLint y, GLint z, GLint w)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, z, w);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos4sMESA(GLshort x, GLshort y, GLshort z, GLshort w)
|
|
{
|
|
_mesa_WindowPos4fMESA(x, y, z, w);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos2dvMESA(const GLdouble *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], 0.0F, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos2fvMESA(const GLfloat *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], 0.0F, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos2ivMESA(const GLint *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], 0.0F, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos2svMESA(const GLshort *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], 0.0F, 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos3dvMESA(const GLdouble *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], v[2], 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos3fvMESA(const GLfloat *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], v[2], 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos3ivMESA(const GLint *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], v[2], 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos3svMESA(const GLshort *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], v[2], 1.0F);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos4dvMESA(const GLdouble *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], v[2], v[3]);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos4fvMESA(const GLfloat *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], v[2], v[3]);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos4ivMESA(const GLint *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], v[2], v[3]);
|
|
}
|
|
|
|
void
|
|
_mesa_WindowPos4svMESA(const GLshort *v)
|
|
{
|
|
_mesa_WindowPos4fMESA(v[0], v[1], v[2], v[3]);
|
|
}
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
/*
|
|
* OpenGL implementation of glWindowPos*MESA()
|
|
*/
|
|
void glWindowPos4fMESA( GLfloat x, GLfloat y, GLfloat z, GLfloat w )
|
|
{
|
|
GLfloat fx, fy;
|
|
|
|
/* Push current matrix mode and viewport attributes */
|
|
glPushAttrib( GL_TRANSFORM_BIT | GL_VIEWPORT_BIT );
|
|
|
|
/* Setup projection parameters */
|
|
glMatrixMode( GL_PROJECTION );
|
|
glPushMatrix();
|
|
glLoadIdentity();
|
|
glMatrixMode( GL_MODELVIEW );
|
|
glPushMatrix();
|
|
glLoadIdentity();
|
|
|
|
glDepthRange( z, z );
|
|
glViewport( (int) x - 1, (int) y - 1, 2, 2 );
|
|
|
|
/* set the raster (window) position */
|
|
fx = x - (int) x;
|
|
fy = y - (int) y;
|
|
glRasterPos4f( fx, fy, 0.0, w );
|
|
|
|
/* restore matrices, viewport and matrix mode */
|
|
glPopMatrix();
|
|
glMatrixMode( GL_PROJECTION );
|
|
glPopMatrix();
|
|
|
|
glPopAttrib();
|
|
}
|
|
|
|
#endif
|