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/*

 * Mesa 3-D graphics library

 * Version:  7.5

 *

 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

 * Copyright (C) 2009  VMware, Inc.  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.

 */

/**

 * \file texgen.c

 *

 * glTexGen-related functions

 */

#include "main/glheader.h"

#include "main/context.h"

#include "main/enums.h"

#include "main/macros.h"

#include "main/texgen.h"

#include "main/texstate.h"

#include "math/m_matrix.h"

#include "main/dispatch.h"

#if FEATURE_texgen

/**

 * Return texgen state for given coordinate

 */

static struct gl_texgen *

get_texgen(struct gl_texture_unit *texUnit, GLenum coord)

{

   switch (coord) {

   case GL_S:

      return &texUnit->GenS;

   case GL_T:

      return &texUnit->GenT;

   case GL_R:

      return &texUnit->GenR;

   case GL_Q:

      return &texUnit->GenQ;

   default:

      return NULL;

   }

}

void GLAPIENTRY

_mesa_TexGenfv( GLenum coord, GLenum pname, const GLfloat *params )

{

   struct gl_texture_unit *texUnit;

   struct gl_texgen *texgen;

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))

      _mesa_debug(ctx, "glTexGen %s %s %.1f(%s)...\n",

                  _mesa_lookup_enum_by_nr(coord),

                  _mesa_lookup_enum_by_nr(pname),

                  *params,

		  _mesa_lookup_enum_by_nr((GLenum) (GLint) *params));

   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexGen(current unit)");

      return;

   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   texgen = get_texgen(texUnit, coord);

   if (!texgen) {

      _mesa_error(ctx, GL_INVALID_ENUM, "glTexGen(coord)");

      return;

   }

   switch (pname) {

   case GL_TEXTURE_GEN_MODE:

      {

         GLenum mode = (GLenum) (GLint) params[0];

         GLbitfield bit = 0x0;

         if (texgen->Mode == mode)

            return;

         switch (mode) {

         case GL_OBJECT_LINEAR:

            bit = TEXGEN_OBJ_LINEAR;

            break;

         case GL_EYE_LINEAR:

            bit = TEXGEN_EYE_LINEAR;

            break;

         case GL_SPHERE_MAP:

            if (coord == GL_S || coord == GL_T)

               bit = TEXGEN_SPHERE_MAP;

            break;

         case GL_REFLECTION_MAP_NV:

            if (coord != GL_Q)

               bit = TEXGEN_REFLECTION_MAP_NV;

            break;

         case GL_NORMAL_MAP_NV:

            if (coord != GL_Q)

               bit = TEXGEN_NORMAL_MAP_NV;

            break;

         default:

            ; /* nop */

         }

         if (!bit) {

            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );

            return;

         }

         FLUSH_VERTICES(ctx, _NEW_TEXTURE);

         texgen->Mode = mode;

         texgen->_ModeBit = bit;

      }

      break;

   case GL_OBJECT_PLANE:

      {

         if (TEST_EQ_4V(texgen->ObjectPlane, params))

            return;

         FLUSH_VERTICES(ctx, _NEW_TEXTURE);

         COPY_4FV(texgen->ObjectPlane, params);

      }

      break;

   case GL_EYE_PLANE:

      {

         GLfloat tmp[4];

         /* Transform plane equation by the inverse modelview matrix */

         if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) {

            _math_matrix_analyse(ctx->ModelviewMatrixStack.Top);

         }

         _mesa_transform_vector(tmp, params,

                                ctx->ModelviewMatrixStack.Top->inv);

         if (TEST_EQ_4V(texgen->EyePlane, tmp))

            return;

         FLUSH_VERTICES(ctx, _NEW_TEXTURE);

         COPY_4FV(texgen->EyePlane, tmp);

      }

      break;

   default:

      _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(pname)" );

      return;

   }

   if (ctx->Driver.TexGen)

      ctx->Driver.TexGen( ctx, coord, pname, params );

}

static void GLAPIENTRY

_mesa_TexGeniv(GLenum coord, GLenum pname, const GLint *params )

{

   GLfloat p[4];

   p[0] = (GLfloat) params[0];

   if (pname == GL_TEXTURE_GEN_MODE) {

      p[1] = p[2] = p[3] = 0.0F;

   }

   else {

      p[1] = (GLfloat) params[1];

      p[2] = (GLfloat) params[2];

      p[3] = (GLfloat) params[3];

   }

   _mesa_TexGenfv(coord, pname, p);

}

static void GLAPIENTRY

_mesa_TexGend(GLenum coord, GLenum pname, GLdouble param )

{

   GLfloat p[4];

   p[0] = (GLfloat) param;

   p[1] = p[2] = p[3] = 0.0F;

   _mesa_TexGenfv( coord, pname, p );

}

#if FEATURE_ES1

void GLAPIENTRY

_es_GetTexGenfv(GLenum coord, GLenum pname, GLfloat *params)

{

   ASSERT(coord == GL_TEXTURE_GEN_STR_OES);

   _mesa_GetTexGenfv(GL_S, pname, params);

}

void GLAPIENTRY

_es_TexGenf(GLenum coord, GLenum pname, GLfloat param)

{

   ASSERT(coord == GL_TEXTURE_GEN_STR_OES);

   /* set S, T, and R at the same time */

   _mesa_TexGenf(GL_S, pname, param);

   _mesa_TexGenf(GL_T, pname, param);

   _mesa_TexGenf(GL_R, pname, param);

}

void GLAPIENTRY

_es_TexGenfv(GLenum coord, GLenum pname, const GLfloat *params)

{

   ASSERT(coord == GL_TEXTURE_GEN_STR_OES);

   /* set S, T, and R at the same time */

   _mesa_TexGenfv(GL_S, pname, params);

   _mesa_TexGenfv(GL_T, pname, params);

   _mesa_TexGenfv(GL_R, pname, params);

}

#endif

static void GLAPIENTRY

_mesa_TexGendv(GLenum coord, GLenum pname, const GLdouble *params )

{

   GLfloat p[4];

   p[0] = (GLfloat) params[0];

   if (pname == GL_TEXTURE_GEN_MODE) {

      p[1] = p[2] = p[3] = 0.0F;

   }

   else {

      p[1] = (GLfloat) params[1];

      p[2] = (GLfloat) params[2];

      p[3] = (GLfloat) params[3];

   }

   _mesa_TexGenfv( coord, pname, p );

}

void GLAPIENTRY

_mesa_TexGenf( GLenum coord, GLenum pname, GLfloat param )

{

   GLfloat p[4];

   p[0] = param;

   p[1] = p[2] = p[3] = 0.0F;

   _mesa_TexGenfv(coord, pname, p);

}

void GLAPIENTRY

_mesa_TexGeni( GLenum coord, GLenum pname, GLint param )

{

   GLint p[4];

   p[0] = param;

   p[1] = p[2] = p[3] = 0;

   _mesa_TexGeniv( coord, pname, p );

}

static void GLAPIENTRY

_mesa_GetTexGendv( GLenum coord, GLenum pname, GLdouble *params )

{

   struct gl_texture_unit *texUnit;

   struct gl_texgen *texgen;

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGendv(current unit)");

      return;

   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   texgen = get_texgen(texUnit, coord);

   if (!texgen) {

      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGendv(coord)");

      return;

   }

   switch (pname) {

   case GL_TEXTURE_GEN_MODE:

      params[0] = ENUM_TO_DOUBLE(texgen->Mode);

      break;

   case GL_OBJECT_PLANE:

      COPY_4V(params, texgen->ObjectPlane);

      break;

   case GL_EYE_PLANE:

      COPY_4V(params, texgen->EyePlane);

      break;

   default:

      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGendv(pname)" );

   }

}

void GLAPIENTRY

_mesa_GetTexGenfv( GLenum coord, GLenum pname, GLfloat *params )

{

   struct gl_texture_unit *texUnit;

   struct gl_texgen *texgen;

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGenfv(current unit)");

      return;

   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   texgen = get_texgen(texUnit, coord);

   if (!texgen) {

      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGenfv(coord)");

      return;

   }

   switch (pname) {

   case GL_TEXTURE_GEN_MODE:

      params[0] = ENUM_TO_FLOAT(texgen->Mode);

      break;

   case GL_OBJECT_PLANE:

      COPY_4V(params, texgen->ObjectPlane);

      break;

   case GL_EYE_PLANE:

      COPY_4V(params, texgen->EyePlane);

      break;

   default:

      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGenfv(pname)" );

   }

}

static void GLAPIENTRY

_mesa_GetTexGeniv( GLenum coord, GLenum pname, GLint *params )

{

   struct gl_texture_unit *texUnit;

   struct gl_texgen *texgen;

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGeniv(current unit)");

      return;

   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   texgen = get_texgen(texUnit, coord);

   if (!texgen) {

      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGeniv(coord)");

      return;

   }

   switch (pname) {

   case GL_TEXTURE_GEN_MODE:

      params[0] = texgen->Mode;

      break;

   case GL_OBJECT_PLANE:

      params[0] = (GLint) texgen->ObjectPlane[0];

      params[1] = (GLint) texgen->ObjectPlane[1];

      params[2] = (GLint) texgen->ObjectPlane[2];

      params[3] = (GLint) texgen->ObjectPlane[3];

      break;

   case GL_EYE_PLANE:

      params[0] = (GLint) texgen->EyePlane[0];

      params[1] = (GLint) texgen->EyePlane[1];

      params[2] = (GLint) texgen->EyePlane[2];

      params[3] = (GLint) texgen->EyePlane[3];

      break;

   default:

      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGeniv(pname)" );

   }

}

void

_mesa_init_texgen_dispatch(struct _glapi_table *disp)

{

   SET_GetTexGendv(disp, _mesa_GetTexGendv);

   SET_GetTexGenfv(disp, _mesa_GetTexGenfv);

   SET_GetTexGeniv(disp, _mesa_GetTexGeniv);

   SET_TexGend(disp, _mesa_TexGend);

   SET_TexGendv(disp, _mesa_TexGendv);

   SET_TexGenf(disp, _mesa_TexGenf);

   SET_TexGenfv(disp, _mesa_TexGenfv);

   SET_TexGeni(disp, _mesa_TexGeni);

   SET_TexGeniv(disp, _mesa_TexGeniv);

}

#endif /* FEATURE_texgen */