Initial revision

1 files changed, 1183 insertions, 0 deletions

diff --git a/src/mesa/main/light.c b/src/mesa/main/light.c
new file mode 100644
index 00000000000..cc396f85a50
--- /dev/null
+++ b/src/mesa/main/light.c
@@ -0,0 +1,1183 @@
+/* $Id: light.c,v 1.1 1999/08/19 00:55:41 jtg Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.1
+ * 
+ * Copyright (C) 1999  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.
+ */
+
+
+
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include <assert.h>
+#include <float.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "context.h"
+#include "enums.h"
+#include "light.h"
+#include "macros.h"
+#include "matrix.h"
+#include "mmath.h"
+#include "simple_list.h"
+#include "types.h"
+#include "vb.h"
+#include "xform.h"
+#ifdef XFree86Server
+#include "GL/xf86glx.h"
+#endif
+#endif
+
+
+
+void gl_ShadeModel( GLcontext *ctx, GLenum mode )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glShadeModel");
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      fprintf(stderr, "glShadeModel %s\n", gl_lookup_enum_by_nr(mode));
+
+   switch (mode) {
+      case GL_FLAT:
+      case GL_SMOOTH:
+         if (ctx->Light.ShadeModel!=mode) {
+            ctx->Light.ShadeModel = mode;
+	    ctx->TriangleCaps ^= DD_FLATSHADE;
+            ctx->NewState |= NEW_RASTER_OPS;
+         }
+         break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glShadeModel" );
+   }
+
+   if (ctx->Driver.ShadeModel) 
+      (*ctx->Driver.ShadeModel)( ctx, mode );
+}
+
+
+
+void gl_Lightfv( GLcontext *ctx,
+                 GLenum light, GLenum pname, const GLfloat *params,
+                 GLint nparams )
+{
+   GLint l;
+
+   (void) nparams;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLight");
+
+   l = (GLint) (light - GL_LIGHT0);
+
+   if (l<0 || l>=MAX_LIGHTS) {
+      gl_error( ctx, GL_INVALID_ENUM, "glLight" );
+      return;
+   }
+
+   switch (pname) {
+      case GL_AMBIENT:
+         COPY_4V( ctx->Light.Light[l].Ambient, params );
+         break;
+      case GL_DIFFUSE:
+         COPY_4V( ctx->Light.Light[l].Diffuse, params );
+         break;
+      case GL_SPECULAR:
+         COPY_4V( ctx->Light.Light[l].Specular, params );
+         break;
+      case GL_POSITION:
+	 /* transform position by ModelView matrix */
+	 TRANSFORM_POINT( ctx->Light.Light[l].EyePosition, 
+			  ctx->ModelView.m,
+                          params );
+         break;
+      case GL_SPOT_DIRECTION:
+	 /* transform direction by inverse modelview */
+	 if (ctx->ModelView.flags & MAT_DIRTY_INVERSE) {
+	    gl_matrix_analyze( &ctx->ModelView );
+	 }
+	 TRANSFORM_NORMAL( ctx->Light.Light[l].EyeDirection,
+			   params,
+			   ctx->ModelView.inv );
+         break;
+      case GL_SPOT_EXPONENT:
+         if (params[0]<0.0 || params[0]>128.0) {
+            gl_error( ctx, GL_INVALID_VALUE, "glLight" );
+            return;
+         }
+         if (ctx->Light.Light[l].SpotExponent != params[0]) {
+            ctx->Light.Light[l].SpotExponent = params[0];
+            gl_compute_spot_exp_table( &ctx->Light.Light[l] );
+         }
+         break;
+      case GL_SPOT_CUTOFF:
+         if ((params[0]<0.0 || params[0]>90.0) && params[0]!=180.0) {
+            gl_error( ctx, GL_INVALID_VALUE, "glLight" );
+            return;
+         }
+         ctx->Light.Light[l].SpotCutoff = params[0];
+         ctx->Light.Light[l].CosCutoff = cos(params[0]*DEG2RAD);
+         if (ctx->Light.Light[l].CosCutoff < 0) 
+	    ctx->Light.Light[l].CosCutoff = 0;
+         break;
+      case GL_CONSTANT_ATTENUATION:
+         if (params[0]<0.0) {
+            gl_error( ctx, GL_INVALID_VALUE, "glLight" );
+            return;
+         }
+         ctx->Light.Light[l].ConstantAttenuation = params[0];
+         break;
+      case GL_LINEAR_ATTENUATION:
+         if (params[0]<0.0) {
+            gl_error( ctx, GL_INVALID_VALUE, "glLight" );
+            return;
+         }
+         ctx->Light.Light[l].LinearAttenuation = params[0];
+         break;
+      case GL_QUADRATIC_ATTENUATION:
+         if (params[0]<0.0) {
+            gl_error( ctx, GL_INVALID_VALUE, "glLight" );
+            return;
+         }
+         ctx->Light.Light[l].QuadraticAttenuation = params[0];
+         break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glLight" );
+         break;
+   }
+
+   ctx->NewState |= NEW_LIGHTING;
+}
+
+
+
+void gl_GetLightfv( GLcontext *ctx,
+                    GLenum light, GLenum pname, GLfloat *params )
+{
+   GLint l = (GLint) (light - GL_LIGHT0);
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetLight");
+
+   if (l<0 || l>=MAX_LIGHTS) {
+      gl_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
+      return;
+   }
+
+   switch (pname) {
+      case GL_AMBIENT:
+         COPY_4V( params, ctx->Light.Light[l].Ambient );
+         break;
+      case GL_DIFFUSE:
+         COPY_4V( params, ctx->Light.Light[l].Diffuse );
+         break;
+      case GL_SPECULAR:
+         COPY_4V( params, ctx->Light.Light[l].Specular );
+         break;
+      case GL_POSITION:
+         COPY_4V( params, ctx->Light.Light[l].EyePosition );
+         break;
+      case GL_SPOT_DIRECTION:
+         COPY_3V( params, ctx->Light.Light[l].EyeDirection );
+         break;
+      case GL_SPOT_EXPONENT:
+         params[0] = ctx->Light.Light[l].SpotExponent;
+         break;
+      case GL_SPOT_CUTOFF:
+         params[0] = ctx->Light.Light[l].SpotCutoff;
+         break;
+      case GL_CONSTANT_ATTENUATION:
+         params[0] = ctx->Light.Light[l].ConstantAttenuation;
+         break;
+      case GL_LINEAR_ATTENUATION:
+         params[0] = ctx->Light.Light[l].LinearAttenuation;
+         break;
+      case GL_QUADRATIC_ATTENUATION:
+         params[0] = ctx->Light.Light[l].QuadraticAttenuation;
+         break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
+         break;
+   }
+}
+
+
+
+void gl_GetLightiv( GLcontext *ctx, GLenum light, GLenum pname, GLint *params )
+{
+   GLint l = (GLint) (light - GL_LIGHT0);
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetLight");
+
+   if (l<0 || l>=MAX_LIGHTS) {
+      gl_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
+      return;
+   }
+
+   switch (pname) {
+      case GL_AMBIENT:
+         params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[0]);
+         params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[1]);
+         params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[2]);
+         params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[3]);
+         break;
+      case GL_DIFFUSE:
+         params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[0]);
+         params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[1]);
+         params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[2]);
+         params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[3]);
+         break;
+      case GL_SPECULAR:
+         params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[0]);
+         params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[1]);
+         params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[2]);
+         params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[3]);
+         break;
+      case GL_POSITION:
+         params[0] = (GLint) ctx->Light.Light[l].EyePosition[0];
+         params[1] = (GLint) ctx->Light.Light[l].EyePosition[1];
+         params[2] = (GLint) ctx->Light.Light[l].EyePosition[2];
+         params[3] = (GLint) ctx->Light.Light[l].EyePosition[3];
+         break;
+      case GL_SPOT_DIRECTION:
+         params[0] = (GLint) ctx->Light.Light[l].EyeDirection[0];
+         params[1] = (GLint) ctx->Light.Light[l].EyeDirection[1];
+         params[2] = (GLint) ctx->Light.Light[l].EyeDirection[2];
+         break;
+      case GL_SPOT_EXPONENT:
+         params[0] = (GLint) ctx->Light.Light[l].SpotExponent;
+         break;
+      case GL_SPOT_CUTOFF:
+         params[0] = (GLint) ctx->Light.Light[l].SpotCutoff;
+         break;
+      case GL_CONSTANT_ATTENUATION:
+         params[0] = (GLint) ctx->Light.Light[l].ConstantAttenuation;
+         break;
+      case GL_LINEAR_ATTENUATION:
+         params[0] = (GLint) ctx->Light.Light[l].LinearAttenuation;
+         break;
+      case GL_QUADRATIC_ATTENUATION:
+         params[0] = (GLint) ctx->Light.Light[l].QuadraticAttenuation;
+         break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
+         break;
+   }
+}
+
+
+
+/**********************************************************************/
+/***                        Light Model                             ***/
+/**********************************************************************/
+
+
+void gl_LightModelfv( GLcontext *ctx, GLenum pname, const GLfloat *params )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLightModel");
+
+   switch (pname) {
+      case GL_LIGHT_MODEL_AMBIENT:
+         COPY_4V( ctx->Light.Model.Ambient, params );
+         break;
+      case GL_LIGHT_MODEL_LOCAL_VIEWER:
+         if (params[0]==0.0)
+            ctx->Light.Model.LocalViewer = GL_FALSE;
+         else
+            ctx->Light.Model.LocalViewer = GL_TRUE;
+         break;
+      case GL_LIGHT_MODEL_TWO_SIDE:
+         if (params[0]==0.0) 
+            ctx->Light.Model.TwoSide = GL_FALSE;
+         else
+            ctx->Light.Model.TwoSide = GL_TRUE;
+         break;
+      case GL_LIGHT_MODEL_COLOR_CONTROL:
+	 ctx->TriangleCaps &= ~DD_SEPERATE_SPECULAR;
+         if (params[0] == (GLfloat) GL_SINGLE_COLOR) 
+            ctx->Light.Model.ColorControl = GL_SINGLE_COLOR;
+         else if (params[0] == (GLfloat) GL_SEPARATE_SPECULAR_COLOR) {
+            ctx->Light.Model.ColorControl = GL_SEPARATE_SPECULAR_COLOR;
+	    ctx->TriangleCaps |= DD_SEPERATE_SPECULAR;
+	 } else
+            gl_error( ctx, GL_INVALID_ENUM, "glLightModel(param)" );
+         break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glLightModel" );
+         break;
+   }
+   ctx->NewState |= NEW_LIGHTING;
+}
+
+
+
+
+/********** MATERIAL **********/
+
+
+/*
+ * Given a face and pname value (ala glColorMaterial), compute a bitmask
+ * of the targeted material values.
+ */
+GLuint gl_material_bitmask( GLcontext *ctx, GLenum face, GLenum pname, 
+			    GLuint legal,
+			    const char *where )
+{
+   GLuint bitmask = 0;
+
+   /* Make a bitmask indicating what material attribute(s) we're updating */
+   switch (pname) {
+      case GL_EMISSION:
+         bitmask |= FRONT_EMISSION_BIT | BACK_EMISSION_BIT;
+         break;
+      case GL_AMBIENT:
+         bitmask |= FRONT_AMBIENT_BIT | BACK_AMBIENT_BIT;
+         break;
+      case GL_DIFFUSE:
+         bitmask |= FRONT_DIFFUSE_BIT | BACK_DIFFUSE_BIT;
+         break;
+      case GL_SPECULAR:
+         bitmask |= FRONT_SPECULAR_BIT | BACK_SPECULAR_BIT;
+         break;
+      case GL_SHININESS:
+         bitmask |= FRONT_SHININESS_BIT | BACK_SHININESS_BIT;
+         break;
+      case GL_AMBIENT_AND_DIFFUSE:
+         bitmask |= FRONT_AMBIENT_BIT | BACK_AMBIENT_BIT;
+         bitmask |= FRONT_DIFFUSE_BIT | BACK_DIFFUSE_BIT;
+         break;
+      case GL_COLOR_INDEXES:
+         bitmask |= FRONT_INDEXES_BIT  | BACK_INDEXES_BIT;
+         break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, where );
+         return 0;
+   }
+
+   if (face==GL_FRONT) {
+      bitmask &= FRONT_MATERIAL_BITS;
+   }
+   else if (face==GL_BACK) {
+      bitmask &= BACK_MATERIAL_BITS;
+   }
+   else if (face != GL_FRONT_AND_BACK) {
+      gl_error( ctx, GL_INVALID_ENUM, where );
+      return 0;
+   }
+   
+   if (bitmask & ~legal) {
+      gl_error( ctx, GL_INVALID_ENUM, where );
+      return 0;
+   }
+
+   return bitmask;
+}
+
+
+
+
+
+
+/*
+ * Check if the global material has to be updated with info that was
+ * associated with a vertex via glMaterial.
+ * This function is used when any material values get changed between
+ * glBegin/glEnd either by calling glMaterial() or by calling glColor()
+ * when GL_COLOR_MATERIAL is enabled.
+ *
+ * KW: Added code here to keep the precomputed variables uptodate.
+ *     This means we can use the faster shade functions when using
+ *     GL_COLOR_MATERIAL, and we can also now use the precomputed 
+ *     values in the slower shading functions, which further offsets
+ *     the cost of doing this here.
+ */
+void gl_update_material( GLcontext *ctx, 
+			 struct gl_material *src, 
+			 GLuint bitmask )
+{
+   struct gl_light *light, *list = &ctx->Light.EnabledList;
+   GLfloat tmp[4];
+
+   if (ctx->Light.ColorMaterialEnabled)
+      bitmask &= ~ctx->Light.ColorMaterialBitmask;
+
+   if (!bitmask) 
+      return;
+
+   if (bitmask & FRONT_AMBIENT_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[0];
+      SUB_3V( tmp, src[0].Ambient, mat->Ambient );
+      ACC_SCALE_3V( ctx->Light.BaseColor[0], ctx->Light.Model.Ambient, tmp);
+      foreach (light, list) {
+	 ACC_SCALE_3V( ctx->Light.BaseColor[0], light->Ambient, tmp );
+      }
+      COPY_4FV( mat->Ambient, src[0].Ambient );
+   }
+   if (bitmask & BACK_AMBIENT_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[1];
+      SUB_3V( tmp, src[1].Ambient, mat->Ambient );
+      ACC_SCALE_3V( ctx->Light.BaseColor[1], ctx->Light.Model.Ambient, tmp);
+      foreach (light, list) {
+	 ACC_SCALE_3V( ctx->Light.BaseColor[0], light->Ambient, tmp );
+      }
+      COPY_4FV( mat->Ambient, src[1].Ambient );
+   }
+   if (bitmask & FRONT_DIFFUSE_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[0];
+      SUB_3V( tmp, src[0].Diffuse, mat->Diffuse );
+      foreach (light, list) {
+	 ACC_SCALE_3V( light->MatDiffuse[0], light->Diffuse, tmp );
+      }
+      COPY_4FV( mat->Diffuse, src[0].Diffuse );
+      FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[0], mat->Diffuse[3]);
+   }
+   if (bitmask & BACK_DIFFUSE_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[1];
+      SUB_3V( tmp, src[1].Diffuse, mat->Diffuse );
+      foreach (light, list) {
+	 ACC_SCALE_3V( light->MatDiffuse[1], light->Diffuse, tmp );
+      }
+      COPY_4FV( mat->Diffuse, src[1].Diffuse );
+      FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[1], mat->Diffuse[3]);
+   }
+   if (bitmask & FRONT_SPECULAR_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[0];
+      SUB_3V( tmp, src[0].Specular, mat->Specular );
+      foreach (light, list) {
+	 if (light->Flags & LIGHT_SPECULAR) {
+	    ACC_SCALE_3V( light->MatSpecular[0], light->Specular, tmp );
+	    light->IsMatSpecular[0] = 
+	       (LEN_SQUARED_3FV(light->MatSpecular[0]) > 1e-16);
+	 }
+      }
+      COPY_4FV( mat->Specular, src[0].Specular );
+   }
+   if (bitmask & BACK_SPECULAR_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[1];
+      SUB_3V( tmp, src[1].Specular, mat->Specular );
+      foreach (light, list) {
+	 if (light->Flags & LIGHT_SPECULAR) {
+	    ACC_SCALE_3V( light->MatSpecular[1], light->Specular, tmp );
+	    light->IsMatSpecular[1] = 
+	       (LEN_SQUARED_3FV(light->MatSpecular[1]) > 1e-16);
+	 }
+      }
+      COPY_4FV( mat->Specular, src[1].Specular );
+   }
+   if (bitmask & FRONT_EMISSION_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[0];
+      SUB_3V( tmp, src[0].Emission, mat->Emission );
+      ACC_3V( ctx->Light.BaseColor[0], tmp );
+      COPY_4FV( mat->Emission, src[0].Emission );
+   }
+   if (bitmask & BACK_EMISSION_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[1];
+      SUB_3V( tmp, src[1].Emission, mat->Emission );
+      ACC_3V( ctx->Light.BaseColor[1], tmp );
+      COPY_4FV( mat->Emission, src[1].Emission );
+   }
+   if (bitmask & FRONT_SHININESS_BIT) {
+      GLfloat shininess = ctx->Light.Material[0].Shininess = src[0].Shininess;
+      gl_compute_shine_table( ctx, 0, shininess );
+      gl_compute_shine_table( ctx, 2, shininess * .5 );
+   }
+   if (bitmask & BACK_SHININESS_BIT) {
+      GLfloat shininess = ctx->Light.Material[1].Shininess = src[1].Shininess;
+      gl_compute_shine_table( ctx, 1, shininess );
+      gl_compute_shine_table( ctx, 3, shininess * .5 );
+   }
+   if (bitmask & FRONT_INDEXES_BIT) {
+      ctx->Light.Material[0].AmbientIndex = src[0].AmbientIndex;
+      ctx->Light.Material[0].DiffuseIndex = src[0].DiffuseIndex;
+      ctx->Light.Material[0].SpecularIndex = src[0].SpecularIndex;
+   }
+   if (bitmask & BACK_INDEXES_BIT) {
+      ctx->Light.Material[1].AmbientIndex = src[1].AmbientIndex;
+      ctx->Light.Material[1].DiffuseIndex = src[1].DiffuseIndex;
+      ctx->Light.Material[1].SpecularIndex = src[1].SpecularIndex;
+   }
+
+}
+
+
+
+
+
+
+void gl_update_color_material( GLcontext *ctx, 
+			       const GLubyte rgba[4] )
+{
+   struct gl_light *light, *list = &ctx->Light.EnabledList;
+   GLuint bitmask = ctx->Light.ColorMaterialBitmask;
+   GLfloat tmp[4], color[4];
+
+   UBYTE_RGBA_TO_FLOAT_RGBA( color, rgba );
+   
+   if (bitmask & FRONT_AMBIENT_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[0];
+      SUB_3V( tmp, color, mat->Ambient );
+      ACC_SCALE_3V( ctx->Light.BaseColor[0], ctx->Light.Model.Ambient, tmp);
+      foreach (light, list) {
+	 ACC_SCALE_3V( ctx->Light.BaseColor[0], light->Ambient, tmp );
+      }
+      COPY_4FV( mat->Ambient, color );
+   }
+
+   if (bitmask & BACK_AMBIENT_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[1];
+      SUB_3V( tmp, color, mat->Ambient );
+      ACC_SCALE_3V( ctx->Light.BaseColor[1], ctx->Light.Model.Ambient, tmp);
+      foreach (light, list) {
+	 ACC_SCALE_3V( ctx->Light.BaseColor[0], light->Ambient, tmp );
+      }
+      COPY_4FV( mat->Ambient, color );
+   }
+
+   if (bitmask & FRONT_DIFFUSE_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[0];
+      SUB_3V( tmp, color, mat->Diffuse );
+      foreach (light, list) {
+	 ACC_SCALE_3V( light->MatDiffuse[0], light->Diffuse, tmp );
+      }
+      COPY_4FV( mat->Diffuse, color );
+      FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[0], mat->Diffuse[3]);
+   }
+
+   if (bitmask & BACK_DIFFUSE_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[1];
+      SUB_3V( tmp, color, mat->Diffuse );
+      foreach (light, list) {
+	 ACC_SCALE_3V( light->MatDiffuse[1], light->Diffuse, tmp );
+      }
+      COPY_4FV( mat->Diffuse, color );
+      FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[1], mat->Diffuse[3]);
+   }
+
+   if (bitmask & FRONT_SPECULAR_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[0];
+      SUB_3V( tmp, color, mat->Specular );
+      foreach (light, list) {
+	 if (light->Flags & LIGHT_SPECULAR) {
+	    ACC_SCALE_3V( light->MatSpecular[0], light->Specular, tmp );
+	    light->IsMatSpecular[0] = 
+	       (LEN_SQUARED_3FV(light->MatSpecular[0]) > 1e-16);
+	 }
+      }
+      COPY_4FV( mat->Specular, color );
+   }
+   if (bitmask & BACK_SPECULAR_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[1];
+      SUB_3V( tmp, color, mat->Specular );
+      foreach (light, list) {
+	 if (light->Flags & LIGHT_SPECULAR) {
+	    ACC_SCALE_3V( light->MatSpecular[1], light->Specular, tmp );
+	    light->IsMatSpecular[1] = 
+	       (LEN_SQUARED_3FV(light->MatSpecular[1]) > 1e-16);
+	 }
+      }
+      COPY_4FV( mat->Specular, color );
+   }
+   if (bitmask & FRONT_EMISSION_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[0];
+      SUB_3V( tmp, color, mat->Emission );
+      ACC_3V( ctx->Light.BaseColor[0], tmp );
+      COPY_4FV( mat->Emission, color );
+   }
+   if (bitmask & BACK_EMISSION_BIT) {
+      struct gl_material *mat = &ctx->Light.Material[1];
+      SUB_3V( tmp, color, mat->Emission );
+      ACC_3V( ctx->Light.BaseColor[1], tmp );
+      COPY_4FV( mat->Emission, color );
+   }
+}
+
+
+
+
+void gl_ColorMaterial( GLcontext *ctx, GLenum face, GLenum mode )
+{
+   GLuint bitmask;
+   GLuint legal = (FRONT_EMISSION_BIT | BACK_EMISSION_BIT |
+		   FRONT_SPECULAR_BIT | BACK_SPECULAR_BIT |
+		   FRONT_DIFFUSE_BIT  | BACK_DIFFUSE_BIT  |
+		   FRONT_AMBIENT_BIT  | BACK_AMBIENT_BIT);
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glColorMaterial");
+
+   bitmask = gl_material_bitmask( ctx, face, mode, legal, "glColorMaterial" );
+
+   if (bitmask != 0) {
+      ctx->Light.ColorMaterialBitmask = bitmask;
+      ctx->Light.ColorMaterialFace = face;
+      ctx->Light.ColorMaterialMode = mode;
+   }
+}
+
+
+
+/* KW:  This is now called directly (ie by name) from the glMaterial* 
+ *      API functions.
+ */
+void gl_Materialfv( GLcontext *ctx,
+                    GLenum face, GLenum pname, const GLfloat *params )
+{
+   struct immediate *IM;
+   struct gl_material *mat;
+   GLuint bitmask;
+   GLuint count;
+
+   bitmask = gl_material_bitmask( ctx, face, pname, ~0, "gl_Materialfv" );
+   if (bitmask == 0)
+      return;
+
+   IM = ctx->input;
+   count = IM->Count;
+
+   if (!(IM->Flag[count] & VERT_MATERIAL)) {
+      IM->Flag[count] |= VERT_MATERIAL;
+      IM->MaterialMask[count] = 0;
+   }
+
+   IM->MaterialMask[count] |= bitmask;
+   mat = IM->Material[count];
+   IM->LastMaterial = count;
+
+   if (bitmask & FRONT_AMBIENT_BIT) {
+      COPY_4FV( mat[0].Ambient, params );
+   }
+   if (bitmask & BACK_AMBIENT_BIT) {
+      COPY_4FV( mat[1].Ambient, params );
+   }
+   if (bitmask & FRONT_DIFFUSE_BIT) {
+      COPY_4FV( mat[0].Diffuse, params );
+   }
+   if (bitmask & BACK_DIFFUSE_BIT) {
+      COPY_4FV( mat[1].Diffuse, params );
+   }
+   if (bitmask & FRONT_SPECULAR_BIT) {
+      COPY_4FV( mat[0].Specular, params );
+   }
+   if (bitmask & BACK_SPECULAR_BIT) {
+      COPY_4FV( mat[1].Specular, params );
+   }
+   if (bitmask & FRONT_EMISSION_BIT) {
+      COPY_4FV( mat[0].Emission, params );
+   }
+   if (bitmask & BACK_EMISSION_BIT) {
+      COPY_4FV( mat[1].Emission, params );
+   }
+   if (bitmask & FRONT_SHININESS_BIT) {
+      GLfloat shininess = CLAMP( params[0], 0.0F, 128.0F );
+      mat[0].Shininess = shininess;
+   }
+   if (bitmask & BACK_SHININESS_BIT) {
+      GLfloat shininess = CLAMP( params[0], 0.0F, 128.0F );
+      mat[1].Shininess = shininess;
+   }
+   if (bitmask & FRONT_INDEXES_BIT) {
+      mat[0].AmbientIndex = params[0];
+      mat[0].DiffuseIndex = params[1];
+      mat[0].SpecularIndex = params[2];
+   }
+   if (bitmask & BACK_INDEXES_BIT) {
+      mat[1].AmbientIndex = params[0];
+      mat[1].DiffuseIndex = params[1];
+      mat[1].SpecularIndex = params[2];
+   }
+}
+
+
+
+
+void gl_GetMaterialfv( GLcontext *ctx,
+                       GLenum face, GLenum pname, GLfloat *params )
+{
+   GLuint f;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetMaterialfv");
+
+   if (face==GL_FRONT) {
+      f = 0;
+   }
+   else if (face==GL_BACK) {
+      f = 1;
+   }
+   else {
+      gl_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(face)" );
+      return;
+   }
+   switch (pname) {
+      case GL_AMBIENT:
+         COPY_4FV( params, ctx->Light.Material[f].Ambient );
+         break;
+      case GL_DIFFUSE:
+         COPY_4FV( params, ctx->Light.Material[f].Diffuse );
+	 break;
+      case GL_SPECULAR:
+         COPY_4FV( params, ctx->Light.Material[f].Specular );
+	 break;
+      case GL_EMISSION:
+	 COPY_4FV( params, ctx->Light.Material[f].Emission );
+	 break;
+      case GL_SHININESS:
+	 *params = ctx->Light.Material[f].Shininess;
+	 break;
+      case GL_COLOR_INDEXES:
+	 params[0] = ctx->Light.Material[f].AmbientIndex;
+	 params[1] = ctx->Light.Material[f].DiffuseIndex;
+	 params[2] = ctx->Light.Material[f].SpecularIndex;
+	 break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
+   }
+}
+
+
+
+void gl_GetMaterialiv( GLcontext *ctx,
+                       GLenum face, GLenum pname, GLint *params )
+{
+   GLuint f;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetMaterialiv");
+
+   if (face==GL_FRONT) {
+      f = 0;
+   }
+   else if (face==GL_BACK) {
+      f = 1;
+   }
+   else {
+      gl_error( ctx, GL_INVALID_ENUM, "glGetMaterialiv(face)" );
+      return;
+   }
+   switch (pname) {
+      case GL_AMBIENT:
+         params[0] = FLOAT_TO_INT( ctx->Light.Material[f].Ambient[0] );
+         params[1] = FLOAT_TO_INT( ctx->Light.Material[f].Ambient[1] );
+         params[2] = FLOAT_TO_INT( ctx->Light.Material[f].Ambient[2] );
+         params[3] = FLOAT_TO_INT( ctx->Light.Material[f].Ambient[3] );
+         break;
+      case GL_DIFFUSE:
+         params[0] = FLOAT_TO_INT( ctx->Light.Material[f].Diffuse[0] );
+         params[1] = FLOAT_TO_INT( ctx->Light.Material[f].Diffuse[1] );
+         params[2] = FLOAT_TO_INT( ctx->Light.Material[f].Diffuse[2] );
+         params[3] = FLOAT_TO_INT( ctx->Light.Material[f].Diffuse[3] );
+	 break;
+      case GL_SPECULAR:
+         params[0] = FLOAT_TO_INT( ctx->Light.Material[f].Specular[0] );
+         params[1] = FLOAT_TO_INT( ctx->Light.Material[f].Specular[1] );
+         params[2] = FLOAT_TO_INT( ctx->Light.Material[f].Specular[2] );
+         params[3] = FLOAT_TO_INT( ctx->Light.Material[f].Specular[3] );
+	 break;
+      case GL_EMISSION:
+         params[0] = FLOAT_TO_INT( ctx->Light.Material[f].Emission[0] );
+         params[1] = FLOAT_TO_INT( ctx->Light.Material[f].Emission[1] );
+         params[2] = FLOAT_TO_INT( ctx->Light.Material[f].Emission[2] );
+         params[3] = FLOAT_TO_INT( ctx->Light.Material[f].Emission[3] );
+	 break;
+      case GL_SHININESS:
+         *params = ROUNDF( ctx->Light.Material[f].Shininess );
+	 break;
+      case GL_COLOR_INDEXES:
+	 params[0] = ROUNDF( ctx->Light.Material[f].AmbientIndex );
+	 params[1] = ROUNDF( ctx->Light.Material[f].DiffuseIndex );
+	 params[2] = ROUNDF( ctx->Light.Material[f].SpecularIndex );
+	 break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
+   }
+}
+
+
+
+
+/**********************************************************************/
+/*****                  Lighting computation                      *****/
+/**********************************************************************/
+
+
+/*
+ * Notes:
+ *   When two-sided lighting is enabled we compute the color (or index)
+ *   for both the front and back side of the primitive.  Then, when the
+ *   orientation of the facet is later learned, we can determine which
+ *   color (or index) to use for rendering.
+ *
+ *   KW: We now know orientation in advance and only shade for 
+ *       the side or sides which are actually required.
+ *
+ * Variables:
+ *   n = normal vector
+ *   V = vertex position
+ *   P = light source position
+ *   Pe = (0,0,0,1)
+ *
+ * Precomputed:
+ *   IF P[3]==0 THEN
+ *       // light at infinity
+ *       IF local_viewer THEN
+ *           VP_inf_norm = unit vector from V to P      // Precompute
+ *       ELSE 
+ *           // eye at infinity
+ *           h_inf_norm = Normalize( VP + <0,0,1> )     // Precompute
+ *       ENDIF
+ *   ENDIF
+ *
+ * Functions:
+ *   Normalize( v ) = normalized vector v
+ *   Magnitude( v ) = length of vector v
+ */
+
+
+
+/*
+ * Whenever the spotlight exponent for a light changes we must call
+ * this function to recompute the exponent lookup table.
+ */
+void gl_compute_spot_exp_table( struct gl_light *l )
+{
+   int i;
+   double exponent = l->SpotExponent;
+   double tmp = 0;
+   int clamp = 0;
+
+   l->SpotExpTable[0][0] = 0.0;
+
+   for (i=EXP_TABLE_SIZE-1;i>0;i--) {
+      if (clamp == 0) {
+         tmp = pow(i/(double)(EXP_TABLE_SIZE-1), exponent);
+         if (tmp < FLT_MIN*100.0) {
+            tmp = 0.0;
+            clamp = 1;
+         }
+      }
+      l->SpotExpTable[i][0] = tmp;
+   }
+   for (i=0;i<EXP_TABLE_SIZE-1;i++) {
+      l->SpotExpTable[i][1] = l->SpotExpTable[i+1][0] - l->SpotExpTable[i][0];
+   }
+   l->SpotExpTable[EXP_TABLE_SIZE-1][1] = 0.0;
+}
+
+
+
+
+/* Calculate a new shine table.  Doing this here saves a branch in
+ * lighting, and the cost of doing it early may be partially offset
+ * by keeping a MRU cache of shine tables for various shine values.
+ */
+static void compute_shine_table( struct gl_shine_tab *tab, GLfloat shininess )
+{
+   int i;
+   GLfloat *m = tab->tab;
+
+   m[0] = 0;
+   if (shininess == 0) {
+      for (i = 1 ; i <= SHINE_TABLE_SIZE ; i++)
+	 m[i] = 1;
+   } else {
+      for (i = 1 ; i <= SHINE_TABLE_SIZE ; i++) {
+	 double t = pow( i/(GLfloat)SHINE_TABLE_SIZE, shininess );
+	 m[i] = 0;
+	 if (t > 1e-20) m[i] = t;
+      }      
+   }
+
+   tab->shininess = shininess;
+}
+
+#define DISTSQR(a,b) ((a-b)*(a-b))
+
+void gl_compute_shine_table( GLcontext *ctx, GLuint i, GLfloat shininess )
+{
+   struct gl_shine_tab *list = ctx->ShineTabList;
+   struct gl_shine_tab *s;
+
+   foreach(s, list) 
+      if ( DISTSQR(s->shininess, shininess) < 1e-4 ) 
+	 break;
+
+   if (s == list) 
+   {
+      foreach(s, list) 
+	 if (s->refcount == 0) break;
+
+      compute_shine_table( s, shininess );
+   }
+
+   ctx->ShineTable[i]->refcount--;
+   ctx->ShineTable[i] = s;
+   move_to_tail( list, s );
+   s->refcount++;
+}
+
+
+
+
+void gl_reinit_light_attrib( GLcontext *ctx, struct gl_light_attrib *l )
+{
+   GLuint i;
+
+   if (ctx->ShineTable[0]->shininess != l->Material[0].Shininess) {
+      gl_compute_shine_table( ctx, 0, l->Material[0].Shininess );
+      gl_compute_shine_table( ctx, 2, l->Material[0].Shininess * .5 );
+   }
+
+   if (ctx->ShineTable[1]->shininess != l->Material[1].Shininess) {
+      gl_compute_shine_table( ctx, 1, l->Material[1].Shininess );
+      gl_compute_shine_table( ctx, 3, l->Material[1].Shininess * .5 );
+   }
+
+   make_empty_list( &l->EnabledList );
+   for (i = 0 ; i < MAX_LIGHTS ; i++) {
+      if (l->Light[i].Enabled) 
+	 insert_at_tail( &l->EnabledList, &l->Light[i] );
+   }
+}
+
+
+
+/*
+ * Examine current lighting parameters to determine if the optimized lighting
+ * function can be used.
+ * Also, precompute some lighting values such as the products of light
+ * source and material ambient, diffuse and specular coefficients.
+ */
+void gl_update_lighting( GLcontext *ctx )
+{
+   struct gl_light *light;
+
+   ctx->Light.Flags = 0;
+
+   foreach(light, &ctx->Light.EnabledList) {
+
+      light->Flags = 0;
+
+      if (light->EyePosition[3] != 0.0F) 
+	 light->Flags |= LIGHT_POSITIONAL;
+      
+      if (LEN_SQUARED_3FV(light->Specular) > 1e-16) 
+	 light->Flags |= LIGHT_SPECULAR;
+      
+      if (light->SpotCutoff != 180.0F)
+	 light->Flags |= LIGHT_SPOT;
+
+      ctx->Light.Flags |= light->Flags;
+   }
+
+   ctx->Light.NeedVertices = 
+      ((ctx->Light.Flags & (LIGHT_POSITIONAL|LIGHT_SPOT)) ||
+       (ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR) ||
+       (ctx->Light.Model.LocalViewer && (ctx->Light.Flags & LIGHT_SPECULAR)));
+
+
+   /* Precompute some shading values.
+    */
+   if (ctx->Visual->RGBAflag) 
+   {
+      GLuint sides = ((ctx->TriangleCaps & DD_TRI_LIGHT_TWOSIDE) ? 2 : 1);
+      GLuint side;
+      for (side=0; side < sides; side++) {
+	 struct gl_material *mat = &ctx->Light.Material[side];
+	 
+	 COPY_3V(ctx->Light.BaseColor[side], mat->Emission);
+	 ACC_SCALE_3V(ctx->Light.BaseColor[side], 
+		      ctx->Light.Model.Ambient,
+		      mat->Ambient);
+
+	 FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[side],
+				    ctx->Light.Material[side].Diffuse[3] );
+      }
+      
+      foreach (light, &ctx->Light.EnabledList) {	 
+	 for (side=0; side< sides; side++) {
+	    struct gl_material *mat = &ctx->Light.Material[side];
+	    SCALE_3V( light->MatDiffuse[side],  light->Diffuse, mat->Diffuse );
+	    SCALE_3V( light->MatAmbient[side],  light->Ambient, mat->Ambient );
+	    ACC_3V( ctx->Light.BaseColor[side], light->MatAmbient[side] ); 
+	    if (light->Flags & LIGHT_SPECULAR)
+	    {
+	       SCALE_3V( light->MatSpecular[side], light->Specular,
+			 mat->Specular);
+	       light->IsMatSpecular[side] = 
+		  (LEN_SQUARED_3FV(light->MatSpecular[side]) > 1e-16);
+	    } 
+	    else 
+	       light->IsMatSpecular[side] = 0;
+	 }
+      }
+   } 
+   else
+   {
+      static GLfloat ci[3] = { .30, .59, .11 };
+
+      foreach(light, &ctx->Light.EnabledList) {
+	 light->dli = DOT3(ci, light->Diffuse);
+	 light->sli = DOT3(ci, light->Specular);
+      }
+   }
+}
+
+/* Need to seriously restrict the circumstances under which these
+ * calc's are performed.
+ */
+void gl_compute_light_positions( GLcontext *ctx )
+{
+   struct gl_light *light;
+   
+   if (ctx->Light.NeedVertices && !ctx->Light.Model.LocalViewer) {
+      GLfloat eye_z[3] = { 0, 0, 1 };
+      if (!ctx->NeedEyeCoords) {
+	 TRANSFORM_NORMAL( ctx->EyeZDir, eye_z, ctx->ModelView.m );
+      } else {
+	 COPY_3V( ctx->EyeZDir, eye_z );
+      }
+   }
+
+   foreach (light, &ctx->Light.EnabledList) {
+
+      if (!ctx->NeedEyeCoords) {
+	 TRANSFORM_POINT( light->Position, ctx->ModelView.inv, 
+			  light->EyePosition );
+      } else {
+	 COPY_4FV( light->Position, light->EyePosition );
+      }
+
+      if (!(light->Flags & LIGHT_POSITIONAL))
+      {
+	 /* VP (VP) = Normalize( Position ) */
+	 COPY_3V( light->VP_inf_norm, light->Position );
+	 NORMALIZE_3FV( light->VP_inf_norm );
+
+	 if (!ctx->Light.Model.LocalViewer)
+	 {
+	    /* h_inf_norm = Normalize( V_to_P + <0,0,1> ) */
+	    ADD_3V( light->h_inf_norm, light->VP_inf_norm, ctx->EyeZDir);
+	    NORMALIZE_3FV( light->h_inf_norm );
+	 }
+
+	 light->VP_inf_spot_attenuation = 1.0;
+      }
+      
+      if (light->Flags & LIGHT_SPOT) 
+      {
+	 if (ctx->NeedEyeNormals) {
+	    COPY_3V( light->NormDirection, light->EyeDirection );
+	 } else {
+	    TRANSFORM_NORMAL( light->NormDirection, 
+			      light->EyeDirection,
+			      ctx->ModelView.m);
+	 }
+
+	 NORMALIZE_3FV( light->NormDirection );
+
+
+	 /* Unlikely occurrance?
+	  */
+	 if (!(light->Flags & LIGHT_POSITIONAL)) {
+	    GLfloat PV_dot_dir = - DOT3(light->VP_inf_norm, 
+					light->NormDirection);
+
+	    if (PV_dot_dir > light->CosCutoff) {
+	       double x = PV_dot_dir * (EXP_TABLE_SIZE-1);
+	       int k = (int) x;
+	       light->VP_inf_spot_attenuation = 
+		  (light->SpotExpTable[k][0] + 
+		   (x-k)*light->SpotExpTable[k][1]);
+	    }
+	    else 
+	       light->VP_inf_spot_attenuation = 0;
+	 }
+      }
+   }
+}
+
+
+
+
+
+void gl_update_normal_transform( GLcontext *ctx )
+{
+   GLuint new_flag = 0;
+   normal_func *last = ctx->NormalTransform;
+   
+   ctx->vb_rescale_factor = 1.0;
+
+   if (ctx->NeedEyeCoords) {
+      if (ctx->NeedNormals) {
+	 GLuint transform = NORM_TRANSFORM_NO_ROT;
+
+	 if (ctx->ModelView.flags & (MAT_FLAG_GENERAL |
+				     MAT_FLAG_ROTATION |
+				     MAT_FLAG_GENERAL_3D |
+				     MAT_FLAG_PERSPECTIVE)) 
+	    transform = NORM_TRANSFORM;
+
+	    
+	 new_flag = ctx->NewState & NEW_MODELVIEW;
+	 ctx->vb_rescale_factor = ctx->rescale_factor;
+	       
+	 if (ctx->Transform.Normalize) 
+	 {
+	    ctx->NormalTransform = gl_normal_tab[transform | NORM_NORMALIZE];
+	 } 
+	 else if (ctx->Transform.RescaleNormals &&
+		  ctx->rescale_factor != 1.0)
+	 {
+	    ctx->NormalTransform = gl_normal_tab[transform | NORM_RESCALE];
+	 }
+	 else 
+	 {
+	    ctx->NormalTransform = gl_normal_tab[transform];
+	 }
+      } else {
+	 ctx->NormalTransform = 0;
+      }
+   }
+   else {
+      if (ctx->NeedNormals) {
+	 ctx->vb_rescale_factor = 1.0/ctx->rescale_factor;
+
+	 if (ctx->Transform.Normalize) 
+	 {
+	    ctx->NormalTransform = gl_normal_tab[NORM_NORMALIZE];
+	 }
+	 else if (!ctx->Transform.RescaleNormals &&
+		  ctx->rescale_factor != 1.0)
+	 {
+	    ctx->NormalTransform = gl_normal_tab[NORM_RESCALE];
+	 }
+	 else
+	 {
+	    ctx->NormalTransform = 0;
+	 }
+      } else {
+	 ctx->NormalTransform = 0;
+      }
+   }
+
+   if (last != ctx->NormalTransform || new_flag)
+      ctx->NewState |= NEW_NORMAL_TRANSFORM;
+}
+