+++ /dev/null
-/*
- * Mesa 3-D graphics library
- *
- * Copyright (C) 1999-2007 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
- * THE AUTHORS OR COPYRIGHT HOLDERS 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.
- */
-
-
-#include "c99_math.h"
-#include "main/glheader.h"
-#include "main/feedback.h"
-#include "main/light.h"
-#include "main/macros.h"
-#include "util/simple_list.h"
-#include "main/mtypes.h"
-#include "main/viewport.h"
-
-#include "math/m_matrix.h"
-#include "tnl/tnl.h"
-
-
-
-/**
- * Clip a point against the view volume.
- *
- * \param v vertex vector describing the point to clip.
- *
- * \return zero if outside view volume, or one if inside.
- */
-static GLuint
-viewclip_point_xy( const GLfloat v[] )
-{
- if ( v[0] > v[3] || v[0] < -v[3]
- || v[1] > v[3] || v[1] < -v[3] ) {
- return 0;
- }
- else {
- return 1;
- }
-}
-
-
-/**
- * Clip a point against the far/near Z clipping planes.
- *
- * \param v vertex vector describing the point to clip.
- *
- * \return zero if outside view volume, or one if inside.
- */
-static GLuint
-viewclip_point_z( const GLfloat v[] )
-{
- if (v[2] > v[3] || v[2] < -v[3] ) {
- return 0;
- }
- else {
- return 1;
- }
-}
-
-
-/**
- * Clip a point against the user clipping planes.
- *
- * \param ctx GL context.
- * \param v vertex vector describing the point to clip.
- *
- * \return zero if the point was clipped, or one otherwise.
- */
-static GLuint
-userclip_point( struct gl_context *ctx, const GLfloat v[] )
-{
- GLuint p;
-
- for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
- if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
- GLfloat dot = v[0] * ctx->Transform._ClipUserPlane[p][0]
- + v[1] * ctx->Transform._ClipUserPlane[p][1]
- + v[2] * ctx->Transform._ClipUserPlane[p][2]
- + v[3] * ctx->Transform._ClipUserPlane[p][3];
- if (dot < 0.0F) {
- return 0;
- }
- }
- }
-
- return 1;
-}
-
-
-/**
- * Compute lighting for the raster position. RGB modes computed.
- * \param ctx the context
- * \param vertex vertex location
- * \param normal normal vector
- * \param Rcolor returned color
- * \param Rspec returned specular color (if separate specular enabled)
- */
-static void
-shade_rastpos(struct gl_context *ctx,
- const GLfloat vertex[4],
- const GLfloat normal[3],
- GLfloat Rcolor[4],
- GLfloat Rspec[4])
-{
- /*const*/ GLfloat (*base)[3] = ctx->Light._BaseColor;
- const struct gl_light *light;
- GLfloat diffuseColor[4], specularColor[4]; /* for RGB mode only */
-
- COPY_3V(diffuseColor, base[0]);
- diffuseColor[3] = CLAMP(
- ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3], 0.0F, 1.0F );
- ASSIGN_4V(specularColor, 0.0, 0.0, 0.0, 1.0);
-
- foreach (light, &ctx->Light.EnabledList) {
- GLfloat attenuation = 1.0;
- GLfloat VP[3]; /* vector from vertex to light pos */
- GLfloat n_dot_VP;
- GLfloat diffuseContrib[3], specularContrib[3];
-
- if (!(light->_Flags & LIGHT_POSITIONAL)) {
- /* light at infinity */
- COPY_3V(VP, light->_VP_inf_norm);
- attenuation = light->_VP_inf_spot_attenuation;
- }
- else {
- /* local/positional light */
- GLfloat d;
-
- /* VP = vector from vertex pos to light[i].pos */
- SUB_3V(VP, light->_Position, vertex);
- /* d = length(VP) */
- d = (GLfloat) LEN_3FV( VP );
- if (d > 1.0e-6F) {
- /* normalize VP */
- GLfloat invd = 1.0F / d;
- SELF_SCALE_SCALAR_3V(VP, invd);
- }
-
- /* atti */
- attenuation = 1.0F / (light->ConstantAttenuation + d *
- (light->LinearAttenuation + d *
- light->QuadraticAttenuation));
-
- if (light->_Flags & LIGHT_SPOT) {
- GLfloat PV_dot_dir = - DOT3(VP, light->_NormSpotDirection);
-
- if (PV_dot_dir<light->_CosCutoff) {
- continue;
- }
- else {
- GLfloat spot = powf(PV_dot_dir, light->SpotExponent);
- attenuation *= spot;
- }
- }
- }
-
- if (attenuation < 1e-3F)
- continue;
-
- n_dot_VP = DOT3( normal, VP );
-
- if (n_dot_VP < 0.0F) {
- ACC_SCALE_SCALAR_3V(diffuseColor, attenuation, light->_MatAmbient[0]);
- continue;
- }
-
- /* Ambient + diffuse */
- COPY_3V(diffuseContrib, light->_MatAmbient[0]);
- ACC_SCALE_SCALAR_3V(diffuseContrib, n_dot_VP, light->_MatDiffuse[0]);
-
- /* Specular */
- {
- const GLfloat *h;
- GLfloat n_dot_h;
-
- ASSIGN_3V(specularContrib, 0.0, 0.0, 0.0);
-
- if (ctx->Light.Model.LocalViewer) {
- GLfloat v[3];
- COPY_3V(v, vertex);
- NORMALIZE_3FV(v);
- SUB_3V(VP, VP, v);
- NORMALIZE_3FV(VP);
- h = VP;
- }
- else if (light->_Flags & LIGHT_POSITIONAL) {
- ACC_3V(VP, ctx->_EyeZDir);
- NORMALIZE_3FV(VP);
- h = VP;
- }
- else {
- h = light->_h_inf_norm;
- }
-
- n_dot_h = DOT3(normal, h);
-
- if (n_dot_h > 0.0F) {
- GLfloat shine;
- GLfloat spec_coef;
-
- shine = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
- spec_coef = powf(n_dot_h, shine);
-
- if (spec_coef > 1.0e-10F) {
- if (ctx->Light.Model.ColorControl==GL_SEPARATE_SPECULAR_COLOR) {
- ACC_SCALE_SCALAR_3V( specularContrib, spec_coef,
- light->_MatSpecular[0]);
- }
- else {
- ACC_SCALE_SCALAR_3V( diffuseContrib, spec_coef,
- light->_MatSpecular[0]);
- }
- }
- }
- }
-
- ACC_SCALE_SCALAR_3V( diffuseColor, attenuation, diffuseContrib );
- ACC_SCALE_SCALAR_3V( specularColor, attenuation, specularContrib );
- }
-
- Rcolor[0] = CLAMP(diffuseColor[0], 0.0F, 1.0F);
- Rcolor[1] = CLAMP(diffuseColor[1], 0.0F, 1.0F);
- Rcolor[2] = CLAMP(diffuseColor[2], 0.0F, 1.0F);
- Rcolor[3] = CLAMP(diffuseColor[3], 0.0F, 1.0F);
- Rspec[0] = CLAMP(specularColor[0], 0.0F, 1.0F);
- Rspec[1] = CLAMP(specularColor[1], 0.0F, 1.0F);
- Rspec[2] = CLAMP(specularColor[2], 0.0F, 1.0F);
- Rspec[3] = CLAMP(specularColor[3], 0.0F, 1.0F);
-}
-
-
-/**
- * Do texgen needed for glRasterPos.
- * \param ctx rendering context
- * \param vObj object-space vertex coordinate
- * \param vEye eye-space vertex coordinate
- * \param normal vertex normal
- * \param unit texture unit number
- * \param texcoord incoming texcoord and resulting texcoord
- */
-static void
-compute_texgen(struct gl_context *ctx, const GLfloat vObj[4], const GLfloat vEye[4],
- const GLfloat normal[3], GLuint unit, GLfloat texcoord[4])
-{
- const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
-
- /* always compute sphere map terms, just in case */
- GLfloat u[3], two_nu, rx, ry, rz, m, mInv;
- COPY_3V(u, vEye);
- NORMALIZE_3FV(u);
- two_nu = 2.0F * DOT3(normal, u);
- rx = u[0] - normal[0] * two_nu;
- ry = u[1] - normal[1] * two_nu;
- rz = u[2] - normal[2] * two_nu;
- m = rx * rx + ry * ry + (rz + 1.0F) * (rz + 1.0F);
- if (m > 0.0F)
- mInv = 0.5F * (1.0f / sqrtf(m));
- else
- mInv = 0.0F;
-
- if (texUnit->TexGenEnabled & S_BIT) {
- switch (texUnit->GenS.Mode) {
- case GL_OBJECT_LINEAR:
- texcoord[0] = DOT4(vObj, texUnit->GenS.ObjectPlane);
- break;
- case GL_EYE_LINEAR:
- texcoord[0] = DOT4(vEye, texUnit->GenS.EyePlane);
- break;
- case GL_SPHERE_MAP:
- texcoord[0] = rx * mInv + 0.5F;
- break;
- case GL_REFLECTION_MAP:
- texcoord[0] = rx;
- break;
- case GL_NORMAL_MAP:
- texcoord[0] = normal[0];
- break;
- default:
- _mesa_problem(ctx, "Bad S texgen in compute_texgen()");
- return;
- }
- }
-
- if (texUnit->TexGenEnabled & T_BIT) {
- switch (texUnit->GenT.Mode) {
- case GL_OBJECT_LINEAR:
- texcoord[1] = DOT4(vObj, texUnit->GenT.ObjectPlane);
- break;
- case GL_EYE_LINEAR:
- texcoord[1] = DOT4(vEye, texUnit->GenT.EyePlane);
- break;
- case GL_SPHERE_MAP:
- texcoord[1] = ry * mInv + 0.5F;
- break;
- case GL_REFLECTION_MAP:
- texcoord[1] = ry;
- break;
- case GL_NORMAL_MAP:
- texcoord[1] = normal[1];
- break;
- default:
- _mesa_problem(ctx, "Bad T texgen in compute_texgen()");
- return;
- }
- }
-
- if (texUnit->TexGenEnabled & R_BIT) {
- switch (texUnit->GenR.Mode) {
- case GL_OBJECT_LINEAR:
- texcoord[2] = DOT4(vObj, texUnit->GenR.ObjectPlane);
- break;
- case GL_EYE_LINEAR:
- texcoord[2] = DOT4(vEye, texUnit->GenR.EyePlane);
- break;
- case GL_REFLECTION_MAP:
- texcoord[2] = rz;
- break;
- case GL_NORMAL_MAP:
- texcoord[2] = normal[2];
- break;
- default:
- _mesa_problem(ctx, "Bad R texgen in compute_texgen()");
- return;
- }
- }
-
- if (texUnit->TexGenEnabled & Q_BIT) {
- switch (texUnit->GenQ.Mode) {
- case GL_OBJECT_LINEAR:
- texcoord[3] = DOT4(vObj, texUnit->GenQ.ObjectPlane);
- break;
- case GL_EYE_LINEAR:
- texcoord[3] = DOT4(vEye, texUnit->GenQ.EyePlane);
- break;
- default:
- _mesa_problem(ctx, "Bad Q texgen in compute_texgen()");
- return;
- }
- }
-}
-
-
-/**
- * glRasterPos transformation. Typically called via ctx->Driver.RasterPos().
- * XXX some of this code (such as viewport xform, clip testing and setting
- * of ctx->Current.Raster* fields) could get lifted up into the
- * main/rasterpos.c code.
- *
- * \param vObj vertex position in object space
- */
-void
-_tnl_RasterPos(struct gl_context *ctx, const GLfloat vObj[4])
-{
- if (ctx->VertexProgram._Enabled) {
- /* XXX implement this */
- _mesa_problem(ctx, "Vertex programs not implemented for glRasterPos");
- return;
- }
- else {
- GLfloat eye[4], clip[4], ndc[3], d;
- GLfloat *norm, eyenorm[3];
- GLfloat *objnorm = ctx->Current.Attrib[VERT_ATTRIB_NORMAL];
- float scale[3], translate[3];
-
- /* apply modelview matrix: eye = MV * obj */
- TRANSFORM_POINT( eye, ctx->ModelviewMatrixStack.Top->m, vObj );
- /* apply projection matrix: clip = Proj * eye */
- TRANSFORM_POINT( clip, ctx->ProjectionMatrixStack.Top->m, eye );
-
- /* clip to view volume. */
- if (!ctx->Transform.DepthClamp) {
- if (viewclip_point_z(clip) == 0) {
- ctx->Current.RasterPosValid = GL_FALSE;
- return;
- }
- }
- if (!ctx->Transform.RasterPositionUnclipped) {
- if (viewclip_point_xy(clip) == 0) {
- ctx->Current.RasterPosValid = GL_FALSE;
- return;
- }
- }
-
- /* clip to user clipping planes */
- if (ctx->Transform.ClipPlanesEnabled && !userclip_point(ctx, clip)) {
- ctx->Current.RasterPosValid = GL_FALSE;
- return;
- }
-
- /* ndc = clip / W */
- d = (clip[3] == 0.0F) ? 1.0F : 1.0F / clip[3];
- ndc[0] = clip[0] * d;
- ndc[1] = clip[1] * d;
- ndc[2] = clip[2] * d;
- /* wincoord = viewport_mapping(ndc) */
- _mesa_get_viewport_xform(ctx, 0, scale, translate);
- ctx->Current.RasterPos[0] = ndc[0] * scale[0] + translate[0];
- ctx->Current.RasterPos[1] = ndc[1] * scale[1] + translate[1];
- ctx->Current.RasterPos[2] = ndc[2] * scale[2] + translate[2];
- ctx->Current.RasterPos[3] = clip[3];
-
- if (ctx->Transform.DepthClamp) {
- ctx->Current.RasterPos[3] = CLAMP(ctx->Current.RasterPos[3],
- ctx->ViewportArray[0].Near,
- ctx->ViewportArray[0].Far);
- }
-
- /* compute raster distance */
- if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
- ctx->Current.RasterDistance = ctx->Current.Attrib[VERT_ATTRIB_FOG][0];
- else
- ctx->Current.RasterDistance =
- sqrtf( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );
-
- /* compute transformed normal vector (for lighting or texgen) */
- if (ctx->_NeedEyeCoords) {
- const GLfloat *inv = ctx->ModelviewMatrixStack.Top->inv;
- TRANSFORM_NORMAL( eyenorm, objnorm, inv );
- norm = eyenorm;
- }
- else {
- norm = objnorm;
- }
-
- /* update raster color */
- if (ctx->Light.Enabled) {
- /* lighting */
- shade_rastpos( ctx, vObj, norm,
- ctx->Current.RasterColor,
- ctx->Current.RasterSecondaryColor );
- }
- else {
- /* use current color */
- COPY_4FV(ctx->Current.RasterColor,
- ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
- COPY_4FV(ctx->Current.RasterSecondaryColor,
- ctx->Current.Attrib[VERT_ATTRIB_COLOR1]);
- }
-
- /* texture coords */
- {
- GLuint u;
- for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
- GLfloat tc[4];
- COPY_4V(tc, ctx->Current.Attrib[VERT_ATTRIB_TEX0 + u]);
- if (ctx->Texture.Unit[u].TexGenEnabled) {
- compute_texgen(ctx, vObj, eye, norm, u, tc);
- }
- TRANSFORM_POINT(ctx->Current.RasterTexCoords[u],
- ctx->TextureMatrixStack[u].Top->m, tc);
- }
- }
-
- ctx->Current.RasterPosValid = GL_TRUE;
- }
-
- if (ctx->RenderMode == GL_SELECT) {
- _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
- }
-}
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