src/mesa/main/enable.c

/* $Id: enable.c,v 1.39 2001/01/05 05:31:42 keithw Exp $ */

/*
 * Mesa 3-D graphics library
 * Version:  3.5
 *
 * Copyright (C) 1999-2000  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 "glheader.h"
#include "context.h"
#include "enable.h"
#include "light.h"
#include "macros.h"
#include "mmath.h"
#include "simple_list.h"
#include "mtypes.h"
#include "enums.h"

#include "math/m_matrix.h"
#include "math/m_xform.h"

#endif


static void
client_state( GLcontext *ctx, GLenum cap, GLboolean state )
{
   GLuint flag;
   GLboolean *var;

   switch (cap) {
   case GL_VERTEX_ARRAY:
      var = &ctx->Array.Vertex.Enabled;
      flag = _NEW_ARRAY_VERTEX;
      break;
   case GL_NORMAL_ARRAY:
      var = &ctx->Array.Normal.Enabled;
      flag = _NEW_ARRAY_NORMAL;
      break;
   case GL_COLOR_ARRAY:
      var = &ctx->Array.Color.Enabled;
      flag = _NEW_ARRAY_COLOR;
      break;
   case GL_INDEX_ARRAY:
      var = &ctx->Array.Index.Enabled;
      flag = _NEW_ARRAY_INDEX;
      break;
   case GL_TEXTURE_COORD_ARRAY: 
      var = &ctx->Array.TexCoord[ctx->Array.ActiveTexture].Enabled;
      flag = _NEW_ARRAY_TEXCOORD(ctx->Array.ActiveTexture);
      break;
   case GL_EDGE_FLAG_ARRAY:
      var = &ctx->Array.EdgeFlag.Enabled;
      flag = _NEW_ARRAY_EDGEFLAG;
      break;
   case GL_FOG_COORDINATE_ARRAY_EXT:
      var = &ctx->Array.FogCoord.Enabled;
      flag = _NEW_ARRAY_FOGCOORD;
      break;
   case GL_SECONDARY_COLOR_ARRAY_EXT:
      var = &ctx->Array.SecondaryColor.Enabled;
      flag = _NEW_ARRAY_SECONDARYCOLOR;
      break;
   default:
      gl_error( ctx, GL_INVALID_ENUM, "glEnable/DisableClientState" );
      return;
   }

   if (*var == flag)
      return;

   FLUSH_VERTICES(ctx, _NEW_ARRAY);
   ctx->Array.NewState |= flag;
   *var = state;

   if (state) 
      ctx->Array._Enabled |= flag;
   else
      ctx->Array._Enabled &= ~flag;

   if (ctx->Driver.Enable) {
      (*ctx->Driver.Enable)( ctx, cap, state );
   }
}



void
_mesa_EnableClientState( GLenum cap )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);
   client_state( ctx, cap, GL_TRUE );
}



void
_mesa_DisableClientState( GLenum cap )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);
   client_state( ctx, cap, GL_FALSE );
}


/*
 * Perform glEnable and glDisable calls.
 */
void _mesa_set_enable( GLcontext *ctx, GLenum cap, GLboolean state )
{
   if (MESA_VERBOSE & VERBOSE_API)
      fprintf(stderr, "%s %s (newstate is %x)\n",
	      state ? "glEnable" : "glDisable",
	      gl_lookup_enum_by_nr(cap),
	      ctx->NewState);

   switch (cap) {
   case GL_ALPHA_TEST:
      if (ctx->Color.AlphaEnabled == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_COLOR);
      ctx->Color.AlphaEnabled = state;
      break;
   case GL_AUTO_NORMAL:
      if (ctx->Eval.AutoNormal == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.AutoNormal = state;
      break;
   case GL_BLEND:
      if (ctx->Color.BlendEnabled == state) 
	 return;

      FLUSH_VERTICES(ctx, _NEW_COLOR);
      ctx->Color.BlendEnabled = state;
      /* The following needed to accomodate 1.0 RGB logic op blending */
      ctx->Color.ColorLogicOpEnabled = 
	 (ctx->Color.BlendEquation == GL_LOGIC_OP && state);
      break;
   case GL_CLIP_PLANE0:
   case GL_CLIP_PLANE1:
   case GL_CLIP_PLANE2:
   case GL_CLIP_PLANE3:
   case GL_CLIP_PLANE4:
   case GL_CLIP_PLANE5: {
      GLuint p = cap-GL_CLIP_PLANE0;
	 
      if (ctx->Transform.ClipEnabled[p] == state)
	 return;

      FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
      ctx->Transform.ClipEnabled[p] = state;

      if (state) {
	 ctx->_Enabled |= ENABLE_USERCLIP;
	 ctx->Transform._AnyClip++;
	
	 if (ctx->ProjectionMatrix.flags & MAT_DIRTY) {
	    _math_matrix_analyse( &ctx->ProjectionMatrix );
	 }
	
	 /* This derived state also calculated in clip.c and
	  * from gl_update_state() on changes to EyeUserPlane
	  * and ctx->ProjectionMatrix respectively.
	  */
	 gl_transform_vector( ctx->Transform._ClipUserPlane[p],
			      ctx->Transform.EyeUserPlane[p],
			      ctx->ProjectionMatrix.inv );
      } else {
	 if (--ctx->Transform._AnyClip == 0)
	    ctx->_Enabled &= ~ENABLE_USERCLIP;	
      }	
   }
   break;
   case GL_COLOR_MATERIAL:
      if (ctx->Light.ColorMaterialEnabled == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_LIGHT);
      ctx->Light.ColorMaterialEnabled = state;
      if (state) {
	 FLUSH_CURRENT(ctx, 0);
	 gl_update_color_material( ctx, ctx->Current.Color );
      }
      break;
   case GL_CULL_FACE:
      if (ctx->Polygon.CullFlag == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_POLYGON);
      ctx->Polygon.CullFlag = state;
      break;
   case GL_DEPTH_TEST:
      if (state && ctx->Visual.DepthBits==0) {
	 _mesa_warning(ctx,"glEnable(GL_DEPTH_TEST) but no depth buffer");
	 return;
      }
      if (ctx->Depth.Test==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_DEPTH);
      ctx->Depth.Test = state;
      break;
   case GL_DITHER:
      if (ctx->NoDither) {
	 state = GL_FALSE; /* MESA_NO_DITHER env var */
      }
      if (ctx->Color.DitherFlag==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_COLOR);
      ctx->Color.DitherFlag = state;
      break;
   case GL_FOG:
      if (ctx->Fog.Enabled==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_FOG);
      ctx->Fog.Enabled = state;
      ctx->_Enabled ^= ENABLE_FOG;
      break;
   case GL_HISTOGRAM:
      if (!ctx->Extensions.EXT_histogram) {
	 gl_error(ctx, GL_INVALID_ENUM, "enable GL_HISTOGRAM");
	 return;
      }
      if (ctx->Pixel.HistogramEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.HistogramEnabled = state;
      break;
   case GL_LIGHT0:
   case GL_LIGHT1:
   case GL_LIGHT2:
   case GL_LIGHT3:
   case GL_LIGHT4:
   case GL_LIGHT5:
   case GL_LIGHT6:
   case GL_LIGHT7:
      if (ctx->Light.Light[cap-GL_LIGHT0].Enabled == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_LIGHT);
      ctx->Light.Light[cap-GL_LIGHT0].Enabled = state;
      if (state) {
	 insert_at_tail(&ctx->Light.EnabledList,
			&ctx->Light.Light[cap-GL_LIGHT0]);
      }
      else {
	 remove_from_list(&ctx->Light.Light[cap-GL_LIGHT0]);
      }
      break;
   case GL_LIGHTING:
      if (ctx->Light.Enabled == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_LIGHT);
      ctx->Light.Enabled = state;
      ctx->_Enabled ^= ENABLE_LIGHT;
      break;
   case GL_LINE_SMOOTH:
      if (ctx->Line.SmoothFlag == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_LINE);
      ctx->Line.SmoothFlag = state;
      ctx->_TriangleCaps ^= DD_LINE_SMOOTH;
      break;
   case GL_LINE_STIPPLE:
      if (ctx->Line.StippleFlag == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_LINE);
      ctx->Line.StippleFlag = state;
      ctx->_TriangleCaps ^= DD_LINE_STIPPLE;
      break;
   case GL_INDEX_LOGIC_OP:
      if (ctx->Color.IndexLogicOpEnabled == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_COLOR);
      ctx->Color.IndexLogicOpEnabled = state;
      break;
   case GL_COLOR_LOGIC_OP:
      if (ctx->Color.ColorLogicOpEnabled == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_COLOR);
      ctx->Color.ColorLogicOpEnabled = state;
      break;
   case GL_MAP1_COLOR_4:
      if (ctx->Eval.Map1Color4 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map1Color4 = state;
      break;
   case GL_MAP1_INDEX:
      if (ctx->Eval.Map1Index == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map1Index = state;
      break;
   case GL_MAP1_NORMAL:
      if (ctx->Eval.Map1Normal == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map1Normal = state;
      break;
   case GL_MAP1_TEXTURE_COORD_1:
      if (ctx->Eval.Map1TextureCoord1 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map1TextureCoord1 = state;
      break;
   case GL_MAP1_TEXTURE_COORD_2:
      if (ctx->Eval.Map1TextureCoord2 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map1TextureCoord2 = state;
      break;
   case GL_MAP1_TEXTURE_COORD_3:
      if (ctx->Eval.Map1TextureCoord3 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map1TextureCoord3 = state;
      break;
   case GL_MAP1_TEXTURE_COORD_4:
      if (ctx->Eval.Map1TextureCoord4 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map1TextureCoord4 = state;
      break;
   case GL_MAP1_VERTEX_3:
      if (ctx->Eval.Map1Vertex3 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map1Vertex3 = state;
      break;
   case GL_MAP1_VERTEX_4:
      if (ctx->Eval.Map1Vertex4 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map1Vertex4 = state;
      break;
   case GL_MAP2_COLOR_4:
      if (ctx->Eval.Map2Color4 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map2Color4 = state;
      break;
   case GL_MAP2_INDEX:
      if (ctx->Eval.Map2Index == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map2Index = state;
      break;
   case GL_MAP2_NORMAL:
      if (ctx->Eval.Map2Normal == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map2Normal = state;
      break;
   case GL_MAP2_TEXTURE_COORD_1:
      if (ctx->Eval.Map2TextureCoord1 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map2TextureCoord1 = state;
      break;
   case GL_MAP2_TEXTURE_COORD_2:
      if (ctx->Eval.Map2TextureCoord2 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map2TextureCoord2 = state;
      break;
   case GL_MAP2_TEXTURE_COORD_3:
      if (ctx->Eval.Map2TextureCoord3 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map2TextureCoord3 = state;
      break;
   case GL_MAP2_TEXTURE_COORD_4:
      if (ctx->Eval.Map2TextureCoord4 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map2TextureCoord4 = state;
      break;
   case GL_MAP2_VERTEX_3:
      if (ctx->Eval.Map2Vertex3 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map2Vertex3 = state;
      break;
   case GL_MAP2_VERTEX_4:
      if (ctx->Eval.Map2Vertex4 == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_EVAL);
      ctx->Eval.Map2Vertex4 = state;
      break;
   case GL_MINMAX:
      if (ctx->Pixel.MinMaxEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.MinMaxEnabled = state;
      break;
   case GL_NORMALIZE:
      if (ctx->Transform.Normalize == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
      ctx->Transform.Normalize = state;
      ctx->_Enabled ^= ENABLE_NORMALIZE;
      break;
   case GL_POINT_SMOOTH:
      if (ctx->Point.SmoothFlag==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_POINT);
      ctx->Point.SmoothFlag = state;
      ctx->_TriangleCaps ^= DD_POINT_SMOOTH;
      break;
   case GL_POLYGON_SMOOTH:
      if (ctx->Polygon.SmoothFlag==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_POLYGON);
      ctx->Polygon.SmoothFlag = state;
      ctx->_TriangleCaps ^= DD_TRI_SMOOTH;
      break;
   case GL_POLYGON_STIPPLE:
      if (ctx->Polygon.StippleFlag==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_POLYGON);
      ctx->Polygon.StippleFlag = state;
      ctx->_TriangleCaps ^= DD_TRI_STIPPLE;
      break;
   case GL_POLYGON_OFFSET_POINT:
      if (ctx->Polygon.OffsetPoint==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_POLYGON);
      ctx->Polygon.OffsetPoint = state;
      break;
   case GL_POLYGON_OFFSET_LINE:
      if (ctx->Polygon.OffsetLine==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_POLYGON);
      ctx->Polygon.OffsetLine = state;
      break;
   case GL_POLYGON_OFFSET_FILL:
      /*case GL_POLYGON_OFFSET_EXT:*/
      if (ctx->Polygon.OffsetFill==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_POLYGON);
      ctx->Polygon.OffsetFill = state;
      break;
   case GL_RESCALE_NORMAL_EXT:
      if (ctx->Transform.RescaleNormals == state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
      ctx->Transform.RescaleNormals = state;
      ctx->_Enabled ^= ENABLE_RESCALE;
      break;
   case GL_SCISSOR_TEST:
      if (ctx->Scissor.Enabled==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_SCISSOR);
      ctx->Scissor.Enabled = state;
      break;
   case GL_SHARED_TEXTURE_PALETTE_EXT:
      if (ctx->Texture.SharedPalette == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      ctx->Texture.SharedPalette = state;
      break;
   case GL_STENCIL_TEST:
      if (state && ctx->Visual.StencilBits==0) {
	 _mesa_warning(ctx, "glEnable(GL_STENCIL_TEST) but no stencil buffer");
	 return;
      }
      if (ctx->Stencil.Enabled==state) 
	 return;
      FLUSH_VERTICES(ctx, _NEW_STENCIL);
      ctx->Stencil.Enabled = state;
      ctx->_TriangleCaps ^= DD_STENCIL;
      break;
   case GL_TEXTURE_1D: {
      const GLuint curr = ctx->Texture.CurrentUnit;
      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[curr];
      GLuint newenabled = texUnit->Enabled & ~TEXTURE0_1D;
      if (state) 
	 newenabled |= TEXTURE0_1D;
      if (!ctx->Visual.RGBAflag || texUnit->Enabled == newenabled)
	 return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->Enabled = newenabled;
      break;
   }
   case GL_TEXTURE_2D: {
      const GLuint curr = ctx->Texture.CurrentUnit;
      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[curr];
      GLuint newenabled = texUnit->Enabled & ~TEXTURE0_2D;
      if (state) 
	 newenabled |= TEXTURE0_2D;
      if (!ctx->Visual.RGBAflag || texUnit->Enabled == newenabled)
	 return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->Enabled = newenabled;
      break;
   }
   case GL_TEXTURE_3D: {
      const GLuint curr = ctx->Texture.CurrentUnit;
      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[curr];
      GLuint newenabled = texUnit->Enabled & ~TEXTURE0_3D;
      if (state) 
	 newenabled |= TEXTURE0_3D;
      if (!ctx->Visual.RGBAflag || texUnit->Enabled == newenabled)
	 return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->Enabled = newenabled;
      break;
   }
   case GL_TEXTURE_GEN_Q: {
      GLuint unit = ctx->Texture.CurrentUnit;
      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
      GLuint newenabled = texUnit->TexGenEnabled & ~Q_BIT;
      if (state)
	 newenabled |= Q_BIT;
      if (texUnit->TexGenEnabled == newenabled)
	 return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->TexGenEnabled = newenabled;
      break;
   }
   case GL_TEXTURE_GEN_R: {
      GLuint unit = ctx->Texture.CurrentUnit;
      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
      GLuint newenabled = texUnit->TexGenEnabled & ~R_BIT;
      if (state)
	 newenabled |= R_BIT;
      if (texUnit->TexGenEnabled == newenabled)
	 return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->TexGenEnabled = newenabled;
      break;
   }  
   break;
   case GL_TEXTURE_GEN_S: {
      GLuint unit = ctx->Texture.CurrentUnit;
      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
      GLuint newenabled = texUnit->TexGenEnabled & ~S_BIT;
      if (state)
	 newenabled |= S_BIT;
      if (texUnit->TexGenEnabled == newenabled)
	 return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->TexGenEnabled = newenabled;
      break;
   }   
   break;
   case GL_TEXTURE_GEN_T: {
      GLuint unit = ctx->Texture.CurrentUnit;
      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
      GLuint newenabled = texUnit->TexGenEnabled & ~T_BIT;
      if (state)
	 newenabled |= T_BIT;
      if (texUnit->TexGenEnabled == newenabled)
	 return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->TexGenEnabled = newenabled;
      break;
   }
   break;

   /*
    * CLIENT STATE!!!
    */
   case GL_VERTEX_ARRAY:
   case GL_NORMAL_ARRAY:
   case GL_COLOR_ARRAY:
   case GL_INDEX_ARRAY:
   case GL_TEXTURE_COORD_ARRAY: 
   case GL_EDGE_FLAG_ARRAY:
   case GL_FOG_COORDINATE_ARRAY_EXT:
   case GL_SECONDARY_COLOR_ARRAY_EXT:
      client_state( ctx, cap, state );
      return;

      /* GL_HP_occlusion_test */
   case GL_OCCLUSION_TEST_HP:
      if (!ctx->Extensions.HP_occlusion_test) {
	 gl_error( ctx, GL_INVALID_ENUM, state ? "glEnable": "glDisable" );
	 return;
      }
      if (ctx->Depth.OcclusionTest == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_DEPTH);
      ctx->Depth.OcclusionTest = state;
      if (state)
	 ctx->OcclusionResult = ctx->OcclusionResultSaved;
      else
	 ctx->OcclusionResultSaved = ctx->OcclusionResult;
      break;

      /* GL_SGIS_pixel_texture */
   case GL_PIXEL_TEXTURE_SGIS:
      if (!ctx->Extensions.SGIS_pixel_texture) {
	 gl_error( ctx, GL_INVALID_ENUM, state ? "glEnable": "glDisable" );
	 return;
      }
      if (ctx->Pixel.PixelTextureEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.PixelTextureEnabled = state;
      break;

      /* GL_SGIX_pixel_texture */
   case GL_PIXEL_TEX_GEN_SGIX:
      if (!ctx->Extensions.SGIX_pixel_texture) {
	 gl_error( ctx, GL_INVALID_ENUM, state ? "glEnable": "glDisable" );
	 return;
      }
      if (ctx->Pixel.PixelTextureEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.PixelTextureEnabled = state;
      break;

      /* GL_SGI_color_table */
   case GL_COLOR_TABLE_SGI:
      if (!ctx->Extensions.SGI_color_table) {
	 gl_error( ctx, GL_INVALID_ENUM, state ? "glEnable": "glDisable" );
	 return;
      }
      if (ctx->Pixel.ColorTableEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.ColorTableEnabled = state;
      break;
   case GL_POST_CONVOLUTION_COLOR_TABLE_SGI:
      if (!ctx->Extensions.SGI_color_table) {
	 gl_error( ctx, GL_INVALID_ENUM, state ? "glEnable": "glDisable" );
	 return;
      }
      if (ctx->Pixel.PostConvolutionColorTableEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.PostConvolutionColorTableEnabled = state;
      break;
   case GL_POST_COLOR_MATRIX_COLOR_TABLE_SGI:
      if (!ctx->Extensions.SGI_color_table) {
	 gl_error( ctx, GL_INVALID_ENUM, state ? "glEnable": "glDisable" );
	 return;
      }
      if (ctx->Pixel.PostColorMatrixColorTableEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.PostColorMatrixColorTableEnabled = state;
      break;

      /* GL_EXT_convolution */
   case GL_CONVOLUTION_1D:
      if (!ctx->Extensions.EXT_convolution) {
	 gl_error(ctx, GL_INVALID_ENUM, state ? "glEnable" : "glDisable");
	 return;
      }
      if (ctx->Pixel.Convolution1DEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.Convolution1DEnabled = state;
      break;
   case GL_CONVOLUTION_2D:
      if (!ctx->Extensions.EXT_convolution) {
	 gl_error(ctx, GL_INVALID_ENUM, state ? "glEnable" : "glDisable");
	 return;
      }
      if (ctx->Pixel.Convolution2DEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.Convolution2DEnabled = state;
      break;
   case GL_SEPARABLE_2D:
      if (!ctx->Extensions.EXT_convolution) {
	 gl_error(ctx, GL_INVALID_ENUM, state ? "glEnable" : "glDisable");
	 return;
      }
      if (ctx->Pixel.Separable2DEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_PIXEL);
      ctx->Pixel.Separable2DEnabled = state;
      break;

      /* GL_ARB_texture_cube_map */
   case GL_TEXTURE_CUBE_MAP_ARB: {
      const GLuint curr = ctx->Texture.CurrentUnit;
      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[curr];
      GLuint newenabled = texUnit->Enabled & ~TEXTURE0_CUBE;
      if (state) 
	 newenabled |= TEXTURE0_CUBE;
      if (!ctx->Extensions.ARB_texture_cube_map) {
	 gl_error(ctx, GL_INVALID_ENUM, state ? "glEnable" : "glDisable");
	 return;
      }
      if (!ctx->Visual.RGBAflag || texUnit->Enabled == newenabled)
	 return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->Enabled = newenabled;
      break;
   }
      /* GL_EXT_secondary_color */
   case GL_COLOR_SUM_EXT:
      if (!ctx->Extensions.EXT_secondary_color) {
	 gl_error(ctx, GL_INVALID_ENUM, state ? "glEnable" : "glDisable");
	 return;
      }
      if (ctx->Fog.ColorSumEnabled == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_FOG);
      ctx->Fog.ColorSumEnabled = state;
      ctx->_TriangleCaps ^= DD_SEPERATE_SPECULAR;
      break;

      /* GL_MESA_sprite_point */
   case GL_SPRITE_POINT_MESA:
      if (!ctx->Extensions.MESA_sprite_point) {
	 gl_error(ctx, GL_INVALID_ENUM, state ? "glEnable" : "glDisable");
	 return;
      }
      if (ctx->Point.SpriteMode == state)
	 return;
      FLUSH_VERTICES(ctx, _NEW_POINT);
      ctx->Point.SpriteMode = state;
      break;

   default:
      gl_error(ctx, GL_INVALID_ENUM, state ? "glEnable" : "glDisable");
      return;
   }

   if (ctx->Driver.Enable) {
      (*ctx->Driver.Enable)( ctx, cap, state );
   }
}




void
_mesa_Enable( GLenum cap )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   _mesa_set_enable( ctx, cap, GL_TRUE );
}



void
_mesa_Disable( GLenum cap )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   _mesa_set_enable( ctx, cap, GL_FALSE );
}



GLboolean
_mesa_IsEnabled( GLenum cap )
{
   GET_CURRENT_CONTEXT(ctx);
   switch (cap) {
      case GL_ALPHA_TEST:
         return ctx->Color.AlphaEnabled;
      case GL_AUTO_NORMAL:
	 return ctx->Eval.AutoNormal;
      case GL_BLEND:
         return ctx->Color.BlendEnabled;
      case GL_CLIP_PLANE0:
      case GL_CLIP_PLANE1:
      case GL_CLIP_PLANE2:
      case GL_CLIP_PLANE3:
      case GL_CLIP_PLANE4:
      case GL_CLIP_PLANE5:
	 return ctx->Transform.ClipEnabled[cap-GL_CLIP_PLANE0];
      case GL_COLOR_MATERIAL:
	 return ctx->Light.ColorMaterialEnabled;
      case GL_CULL_FACE:
         return ctx->Polygon.CullFlag;
      case GL_DEPTH_TEST:
         return ctx->Depth.Test;
      case GL_DITHER:
	 return ctx->Color.DitherFlag;
      case GL_FOG:
	 return ctx->Fog.Enabled;
      case GL_HISTOGRAM:
         if (ctx->Extensions.EXT_histogram) {
            return ctx->Pixel.HistogramEnabled;
         }
         else {
            gl_error(ctx, GL_INVALID_ENUM, "glIsEnabled");
            return GL_FALSE;
         }
      case GL_LIGHTING:
         return ctx->Light.Enabled;
      case GL_LIGHT0:
      case GL_LIGHT1:
      case GL_LIGHT2:
      case GL_LIGHT3:
      case GL_LIGHT4:
      case GL_LIGHT5:
      case GL_LIGHT6:
      case GL_LIGHT7:
         return ctx->Light.Light[cap-GL_LIGHT0].Enabled;
      case GL_LINE_SMOOTH:
	 return ctx->Line.SmoothFlag;
      case GL_LINE_STIPPLE:
	 return ctx->Line.StippleFlag;
      case GL_INDEX_LOGIC_OP:
	 return ctx->Color.IndexLogicOpEnabled;
      case GL_COLOR_LOGIC_OP:
	 return ctx->Color.ColorLogicOpEnabled;
      case GL_MAP1_COLOR_4:
	 return ctx->Eval.Map1Color4;
      case GL_MAP1_INDEX:
	 return ctx->Eval.Map1Index;
      case GL_MAP1_NORMAL:
	 return ctx->Eval.Map1Normal;
      case GL_MAP1_TEXTURE_COORD_1:
	 return ctx->Eval.Map1TextureCoord1;
      case GL_MAP1_TEXTURE_COORD_2:
	 return ctx->Eval.Map1TextureCoord2;
      case GL_MAP1_TEXTURE_COORD_3:
	 return ctx->Eval.Map1TextureCoord3;
      case GL_MAP1_TEXTURE_COORD_4:
	 return ctx->Eval.Map1TextureCoord4;
      case GL_MAP1_VERTEX_3:
	 return ctx->Eval.Map1Vertex3;
      case GL_MAP1_VERTEX_4:
	 return ctx->Eval.Map1Vertex4;
      case GL_MAP2_COLOR_4:
	 return ctx->Eval.Map2Color4;
      case GL_MAP2_INDEX:
	 return ctx->Eval.Map2Index;
      case GL_MAP2_NORMAL:
	 return ctx->Eval.Map2Normal;
      case GL_MAP2_TEXTURE_COORD_1:
	 return ctx->Eval.Map2TextureCoord1;
      case GL_MAP2_TEXTURE_COORD_2:
	 return ctx->Eval.Map2TextureCoord2;
      case GL_MAP2_TEXTURE_COORD_3:
	 return ctx->Eval.Map2TextureCoord3;
      case GL_MAP2_TEXTURE_COORD_4:
	 return ctx->Eval.Map2TextureCoord4;
      case GL_MAP2_VERTEX_3:
	 return ctx->Eval.Map2Vertex3;
      case GL_MAP2_VERTEX_4:
	 return ctx->Eval.Map2Vertex4;
      case GL_MINMAX:
         return ctx->Pixel.MinMaxEnabled;
      case GL_NORMALIZE:
	 return ctx->Transform.Normalize;
      case GL_POINT_SMOOTH:
	 return ctx->Point.SmoothFlag;
      case GL_POLYGON_SMOOTH:
	 return ctx->Polygon.SmoothFlag;
      case GL_POLYGON_STIPPLE:
	 return ctx->Polygon.StippleFlag;
      case GL_POLYGON_OFFSET_POINT:
	 return ctx->Polygon.OffsetPoint;
      case GL_POLYGON_OFFSET_LINE:
	 return ctx->Polygon.OffsetLine;
      case GL_POLYGON_OFFSET_FILL:
      /*case GL_POLYGON_OFFSET_EXT:*/
	 return ctx->Polygon.OffsetFill;
      case GL_RESCALE_NORMAL_EXT:
         return ctx->Transform.RescaleNormals;
      case GL_SCISSOR_TEST:
	 return ctx->Scissor.Enabled;
      case GL_SHARED_TEXTURE_PALETTE_EXT:
         return ctx->Texture.SharedPalette;
      case GL_STENCIL_TEST:
	 return ctx->Stencil.Enabled;
      case GL_TEXTURE_1D:
         {
            const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
            return (texUnit->Enabled & TEXTURE0_1D) ? GL_TRUE : GL_FALSE;
         }
      case GL_TEXTURE_2D:
         {
            const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
            return (texUnit->Enabled & TEXTURE0_2D) ? GL_TRUE : GL_FALSE;
         }
      case GL_TEXTURE_3D:
         {
            const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
            return (texUnit->Enabled & TEXTURE0_3D) ? GL_TRUE : GL_FALSE;
         }
      case GL_TEXTURE_GEN_Q:
         {
            const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
            return (texUnit->TexGenEnabled & Q_BIT) ? GL_TRUE : GL_FALSE;
         }
      case GL_TEXTURE_GEN_R:
         {
            const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
            return (texUnit->TexGenEnabled & R_BIT) ? GL_TRUE : GL_FALSE;
         }
      case GL_TEXTURE_GEN_S:
         {
            const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
            return (texUnit->TexGenEnabled & S_BIT) ? GL_TRUE : GL_FALSE;
         }
      case GL_TEXTURE_GEN_T:
         {
            const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
            return (texUnit->TexGenEnabled & T_BIT) ? GL_TRUE : GL_FALSE;
         }

      /*
       * CLIENT STATE!!!
       */
      case GL_VERTEX_ARRAY:
         return ctx->Array.Vertex.Enabled;
      case GL_NORMAL_ARRAY:
         return ctx->Array.Normal.Enabled;
      case GL_COLOR_ARRAY:
         return ctx->Array.Color.Enabled;
      case GL_INDEX_ARRAY:
         return ctx->Array.Index.Enabled;
      case GL_TEXTURE_COORD_ARRAY:
         return ctx->Array.TexCoord[ctx->Array.ActiveTexture].Enabled;
      case GL_EDGE_FLAG_ARRAY:
         return ctx->Array.EdgeFlag.Enabled;

      /* GL_HP_occlusion_test */
      case GL_OCCLUSION_TEST_HP:
         if (ctx->Extensions.HP_occlusion_test) {
            return ctx->Depth.OcclusionTest;
         }
         else {
            gl_error( ctx, GL_INVALID_ENUM, "glIsEnabled" );
            return GL_FALSE;
         }

      /* GL_SGIS_pixel_texture */
      case GL_PIXEL_TEXTURE_SGIS:
         return ctx->Pixel.PixelTextureEnabled;

      /* GL_SGIX_pixel_texture */
      case GL_PIXEL_TEX_GEN_SGIX:
         return ctx->Pixel.PixelTextureEnabled;

      /* GL_SGI_color_table */
      case GL_COLOR_TABLE_SGI:
         return ctx->Pixel.ColorTableEnabled;
      case GL_POST_CONVOLUTION_COLOR_TABLE_SGI:
         return ctx->Pixel.PostConvolutionColorTableEnabled;
      case GL_POST_COLOR_MATRIX_COLOR_TABLE_SGI:
         return ctx->Pixel.PostColorMatrixColorTableEnabled;

      /* GL_EXT_convolution */
      case GL_CONVOLUTION_1D:
         return ctx->Pixel.Convolution1DEnabled;
      case GL_CONVOLUTION_2D:
         return ctx->Pixel.Convolution2DEnabled;
      case GL_SEPARABLE_2D:
         return ctx->Pixel.Separable2DEnabled;

      /* GL_ARB_texture_cube_map */
      case GL_TEXTURE_CUBE_MAP_ARB:
         if (ctx->Extensions.ARB_texture_cube_map) {
            const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
            return (texUnit->Enabled & TEXTURE0_CUBE) ? GL_TRUE : GL_FALSE;
         }
         else {
            gl_error(ctx, GL_INVALID_ENUM, "glIsEnabled");
            return GL_FALSE;
         }

      /* GL_MESA_sprite_point */
      case GL_SPRITE_POINT_MESA:
         return ctx->Point.SpriteMode;

      default:
	 gl_error( ctx, GL_INVALID_ENUM, "glIsEnabled" );
	 return GL_FALSE;
   }
}