mesa: refactor: move glTexEnv-related functions into new texenv.c file

1 files changed, 863 insertions, 0 deletions

diff --git a/src/mesa/main/texenv.c b/src/mesa/main/texenv.c
new file mode 100644
index 00000000000..2b5b15524ec
--- /dev/null
+++ b/src/mesa/main/texenv.c
@@ -0,0 +1,863 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.1
+ *
+ * Copyright (C) 1999-2008  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.
+ */
+
+/** 
+ * \file texenv.c
+ *
+ * glTexEnv-related functions
+ */
+
+
+#include "main/glheader.h"
+#include "main/context.h"
+#include "main/enums.h"
+#include "main/macros.h"
+#include "main/texenv.h"
+#include "math/m_xform.h"
+
+
+#define ENUM_TO_FLOAT(X) ((GLfloat)(GLint)(X))
+
+
+void GLAPIENTRY
+_mesa_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
+{
+   GLuint maxUnit;
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_texture_unit *texUnit;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
+      ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxTextureImageUnits;
+   if (ctx->Texture.CurrentUnit >= maxUnit) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexEnvfv(current unit)");
+      return;
+   }
+
+   texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+
+#define TE_ERROR(errCode, msg, value)				\
+   _mesa_error(ctx, errCode, msg, _mesa_lookup_enum_by_nr(value));
+
+   if (target == GL_TEXTURE_ENV) {
+      switch (pname) {
+      case GL_TEXTURE_ENV_MODE:
+         {
+            GLenum mode = (GLenum) (GLint) *param;
+            if (mode == GL_REPLACE_EXT)
+               mode = GL_REPLACE;
+	    if (texUnit->EnvMode == mode)
+	       return;
+            if (mode == GL_MODULATE ||
+                mode == GL_BLEND ||
+                mode == GL_DECAL ||
+                mode == GL_REPLACE ||
+                (mode == GL_ADD && ctx->Extensions.EXT_texture_env_add) ||
+                (mode == GL_COMBINE &&
+                 (ctx->Extensions.EXT_texture_env_combine ||
+                  ctx->Extensions.ARB_texture_env_combine))) {
+               /* legal */
+               FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+               texUnit->EnvMode = mode;
+            }
+            else {
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
+               return;
+            }
+         }
+         break;
+      case GL_TEXTURE_ENV_COLOR:
+         {
+            GLfloat tmp[4];
+            tmp[0] = CLAMP( param[0], 0.0F, 1.0F );
+            tmp[1] = CLAMP( param[1], 0.0F, 1.0F );
+            tmp[2] = CLAMP( param[2], 0.0F, 1.0F );
+            tmp[3] = CLAMP( param[3], 0.0F, 1.0F );
+            if (TEST_EQ_4V(tmp, texUnit->EnvColor))
+               return;
+            FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+            COPY_4FV(texUnit->EnvColor, tmp);
+         }
+         break;
+      case GL_COMBINE_RGB:
+	 if (ctx->Extensions.EXT_texture_env_combine ||
+             ctx->Extensions.ARB_texture_env_combine) {
+	    const GLenum mode = (GLenum) (GLint) *param;
+	    if (texUnit->Combine.ModeRGB == mode)
+	       return;
+	    switch (mode) {
+	    case GL_REPLACE:
+	    case GL_MODULATE:
+	    case GL_ADD:
+	    case GL_ADD_SIGNED:
+	    case GL_INTERPOLATE:
+               /* OK */
+	       break;
+            case GL_SUBTRACT:
+               if (!ctx->Extensions.ARB_texture_env_combine) {
+                  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
+                  return;
+               }
+               break;
+	    case GL_DOT3_RGB_EXT:
+	    case GL_DOT3_RGBA_EXT:
+	       if (!ctx->Extensions.EXT_texture_env_dot3) {
+                  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
+		  return;
+	       }
+	       break;
+	    case GL_DOT3_RGB:
+	    case GL_DOT3_RGBA:
+	       if (!ctx->Extensions.ARB_texture_env_dot3) {
+                  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
+		  return;
+	       }
+	       break;
+	    case GL_MODULATE_ADD_ATI:
+	    case GL_MODULATE_SIGNED_ADD_ATI:
+	    case GL_MODULATE_SUBTRACT_ATI:
+	       if (!ctx->Extensions.ATI_texture_env_combine3) {
+                  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
+		  return;
+	       }
+	       break;
+	    default:
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
+	       return;
+	    }
+	    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	    texUnit->Combine.ModeRGB = mode;
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+         break;
+      case GL_COMBINE_ALPHA:
+	 if (ctx->Extensions.EXT_texture_env_combine ||
+             ctx->Extensions.ARB_texture_env_combine) {
+	    const GLenum mode = (GLenum) (GLint) *param;
+	    if (texUnit->Combine.ModeA == mode)
+	       return;
+            switch (mode) {
+	    case GL_REPLACE:
+	    case GL_MODULATE:
+	    case GL_ADD:
+	    case GL_ADD_SIGNED:
+	    case GL_INTERPOLATE:
+	       /* OK */
+	       break;
+	    case GL_SUBTRACT:
+	       if (!ctx->Extensions.ARB_texture_env_combine) {
+		  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
+		  return;
+	       }
+	       break;
+	    case GL_MODULATE_ADD_ATI:
+	    case GL_MODULATE_SIGNED_ADD_ATI:
+	    case GL_MODULATE_SUBTRACT_ATI:
+	       if (!ctx->Extensions.ATI_texture_env_combine3) {
+                  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
+		  return;
+	       }
+	       break;
+	    default:
+	       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
+	       return;
+	    }
+	    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	    texUnit->Combine.ModeA = mode;
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+	 break;
+      case GL_SOURCE0_RGB:
+      case GL_SOURCE1_RGB:
+      case GL_SOURCE2_RGB:
+	 if (ctx->Extensions.EXT_texture_env_combine ||
+	     ctx->Extensions.ARB_texture_env_combine) {
+	    const GLenum source = (GLenum) (GLint) *param;
+	    const GLuint s = pname - GL_SOURCE0_RGB;
+	    if (texUnit->Combine.SourceRGB[s] == source)
+	       return;
+            if (source == GL_TEXTURE ||
+                source == GL_CONSTANT ||
+                source == GL_PRIMARY_COLOR ||
+                source == GL_PREVIOUS ||
+                (ctx->Extensions.ARB_texture_env_crossbar &&
+                 source >= GL_TEXTURE0 &&
+                 source < GL_TEXTURE0 + ctx->Const.MaxTextureUnits) ||
+                (ctx->Extensions.ATI_texture_env_combine3 &&
+                 (source == GL_ZERO || source == GL_ONE))) {
+               /* legal */
+	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	       texUnit->Combine.SourceRGB[s] = source;
+            }
+            else {
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", source);
+	       return;
+	    }
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+	 break;
+      case GL_SOURCE0_ALPHA:
+      case GL_SOURCE1_ALPHA:
+      case GL_SOURCE2_ALPHA:
+	 if (ctx->Extensions.EXT_texture_env_combine ||
+             ctx->Extensions.ARB_texture_env_combine) {
+	    const GLenum source = (GLenum) (GLint) *param;
+	    const GLuint s = pname - GL_SOURCE0_ALPHA;
+	    if (texUnit->Combine.SourceA[s] == source)
+	       return;
+            if (source == GL_TEXTURE ||
+                source == GL_CONSTANT ||
+                source == GL_PRIMARY_COLOR ||
+                source == GL_PREVIOUS ||
+                (ctx->Extensions.ARB_texture_env_crossbar &&
+                 source >= GL_TEXTURE0 &&
+                 source < GL_TEXTURE0 + ctx->Const.MaxTextureUnits) ||
+		(ctx->Extensions.ATI_texture_env_combine3 &&
+                 (source == GL_ZERO || source == GL_ONE))) {
+               /* legal */
+	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	       texUnit->Combine.SourceA[s] = source;
+            }
+            else {
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", source);
+	       return;
+	    }
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+	 break;
+      case GL_OPERAND0_RGB:
+      case GL_OPERAND1_RGB:
+	 if (ctx->Extensions.EXT_texture_env_combine ||
+	     ctx->Extensions.ARB_texture_env_combine) {
+	    const GLenum operand = (GLenum) (GLint) *param;
+	    const GLuint s = pname - GL_OPERAND0_RGB;
+	    if (texUnit->Combine.OperandRGB[s] == operand)
+	       return;
+	    switch (operand) {
+	    case GL_SRC_COLOR:
+	    case GL_ONE_MINUS_SRC_COLOR:
+	    case GL_SRC_ALPHA:
+	    case GL_ONE_MINUS_SRC_ALPHA:
+	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	       texUnit->Combine.OperandRGB[s] = operand;
+	       break;
+	    default:
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
+	       return;
+	    }
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+	 break;
+      case GL_OPERAND0_ALPHA:
+      case GL_OPERAND1_ALPHA:
+	 if (ctx->Extensions.EXT_texture_env_combine ||
+             ctx->Extensions.ARB_texture_env_combine) {
+	    const GLenum operand = (GLenum) (GLint) *param;
+	    if (texUnit->Combine.OperandA[pname-GL_OPERAND0_ALPHA] == operand)
+	       return;
+	    switch (operand) {
+	    case GL_SRC_ALPHA:
+	    case GL_ONE_MINUS_SRC_ALPHA:
+	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	       texUnit->Combine.OperandA[pname-GL_OPERAND0_ALPHA] = operand;
+	       break;
+	    default:
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
+	       return;
+	    }
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+	 break;
+      case GL_OPERAND2_RGB:
+	 if (ctx->Extensions.ARB_texture_env_combine) {
+	    const GLenum operand = (GLenum) (GLint) *param;
+	    if (texUnit->Combine.OperandRGB[2] == operand)
+	       return;
+	    switch (operand) {
+	    case GL_SRC_COLOR:           /* ARB combine only */
+	    case GL_ONE_MINUS_SRC_COLOR: /* ARB combine only */
+	    case GL_SRC_ALPHA:
+	    case GL_ONE_MINUS_SRC_ALPHA: /* ARB combine only */
+	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	       texUnit->Combine.OperandRGB[2] = operand;
+               break;
+	    default:
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
+	       return;
+	    }
+	 }
+	 else if (ctx->Extensions.EXT_texture_env_combine) {
+	    const GLenum operand = (GLenum) (GLint) *param;
+	    if (texUnit->Combine.OperandRGB[2] == operand)
+	       return;
+	    /* operand must be GL_SRC_ALPHA which is the initial value - thus
+	       don't need to actually compare the operand to the possible value */
+	    else {
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
+	       return;
+	    }
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+	 break;
+      case GL_OPERAND2_ALPHA:
+	 if (ctx->Extensions.ARB_texture_env_combine) {
+	    const GLenum operand = (GLenum) (GLint) *param;
+	    if (texUnit->Combine.OperandA[2] == operand)
+	       return;
+	    switch (operand) {
+	    case GL_SRC_ALPHA:
+	    case GL_ONE_MINUS_SRC_ALPHA: /* ARB combine only */
+	       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	       texUnit->Combine.OperandA[2] = operand;
+	       break;
+	    default:
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
+	       return;
+	    }
+	 }
+	 else if (ctx->Extensions.EXT_texture_env_combine) {
+	    const GLenum operand = (GLenum) (GLint) *param;
+	    if (texUnit->Combine.OperandA[2] == operand)
+	       return;
+	    /* operand must be GL_SRC_ALPHA which is the initial value - thus
+	       don't need to actually compare the operand to the possible value */
+	    else {
+               TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", operand);
+	       return;
+	    }
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+	 break;
+      case GL_RGB_SCALE:
+	 if (ctx->Extensions.EXT_texture_env_combine ||
+             ctx->Extensions.ARB_texture_env_combine) {
+	    GLuint newshift;
+	    if (*param == 1.0) {
+	       newshift = 0;
+	    }
+	    else if (*param == 2.0) {
+	       newshift = 1;
+	    }
+	    else if (*param == 4.0) {
+	       newshift = 2;
+	    }
+	    else {
+	       _mesa_error( ctx, GL_INVALID_VALUE,
+                            "glTexEnv(GL_RGB_SCALE not 1, 2 or 4)" );
+	       return;
+	    }
+	    if (texUnit->Combine.ScaleShiftRGB == newshift)
+	       return;
+	    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	    texUnit->Combine.ScaleShiftRGB = newshift;
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+	 break;
+      case GL_ALPHA_SCALE:
+	 if (ctx->Extensions.EXT_texture_env_combine ||
+             ctx->Extensions.ARB_texture_env_combine) {
+	    GLuint newshift;
+	    if (*param == 1.0) {
+	       newshift = 0;
+	    }
+	    else if (*param == 2.0) {
+	       newshift = 1;
+	    }
+	    else if (*param == 4.0) {
+	       newshift = 2;
+	    }
+	    else {
+	       _mesa_error( ctx, GL_INVALID_VALUE,
+                            "glTexEnv(GL_ALPHA_SCALE not 1, 2 or 4)" );
+	       return;
+	    }
+	    if (texUnit->Combine.ScaleShiftA == newshift)
+	       return;
+	    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+	    texUnit->Combine.ScaleShiftA = newshift;
+	 }
+	 else {
+            TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	    return;
+	 }
+	 break;
+      default:
+	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
+	 return;
+      }
+   }
+   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
+      /* GL_EXT_texture_lod_bias */
+      if (!ctx->Extensions.EXT_texture_lod_bias) {
+	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
+	 return;
+      }
+      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
+	 if (texUnit->LodBias == param[0])
+	    return;
+	 FLUSH_VERTICES(ctx, _NEW_TEXTURE);
+         texUnit->LodBias = param[0];
+      }
+      else {
+         TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+	 return;
+      }
+   }
+   else if (target == GL_POINT_SPRITE_NV) {
+      /* GL_ARB_point_sprite / GL_NV_point_sprite */
+      if (!ctx->Extensions.NV_point_sprite
+	  && !ctx->Extensions.ARB_point_sprite) {
+	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
+	 return;
+      }
+      if (pname == GL_COORD_REPLACE_NV) {
+         const GLenum value = (GLenum) param[0];
+         if (value == GL_TRUE || value == GL_FALSE) {
+            /* It's kind of weird to set point state via glTexEnv,
+             * but that's what the spec calls for.
+             */
+            const GLboolean state = (GLboolean) value;
+            if (ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] == state)
+               return;
+            FLUSH_VERTICES(ctx, _NEW_POINT);
+            ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] = state;
+         }
+         else {
+            _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", value);
+            return;
+         }
+      }
+      else {
+         _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname=0x%x)", pname );
+         return;
+      }
+   }
+   else {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)",target );
+      return;
+   }
+
+   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
+      _mesa_debug(ctx, "glTexEnv %s %s %.1f(%s) ...\n",
+                  _mesa_lookup_enum_by_nr(target),
+                  _mesa_lookup_enum_by_nr(pname),
+                  *param,
+                  _mesa_lookup_enum_by_nr((GLenum) (GLint) *param));
+
+   /* Tell device driver about the new texture environment */
+   if (ctx->Driver.TexEnv) {
+      (*ctx->Driver.TexEnv)( ctx, target, pname, param );
+   }
+}
+
+
+void GLAPIENTRY
+_mesa_TexEnvf( GLenum target, GLenum pname, GLfloat param )
+{
+   _mesa_TexEnvfv( target, pname, &param );
+}
+
+
+
+void GLAPIENTRY
+_mesa_TexEnvi( GLenum target, GLenum pname, GLint param )
+{
+   GLfloat p[4];
+   p[0] = (GLfloat) param;
+   p[1] = p[2] = p[3] = 0.0;
+   _mesa_TexEnvfv( target, pname, p );
+}
+
+
+void GLAPIENTRY
+_mesa_TexEnviv( GLenum target, GLenum pname, const GLint *param )
+{
+   GLfloat p[4];
+   if (pname == GL_TEXTURE_ENV_COLOR) {
+      p[0] = INT_TO_FLOAT( param[0] );
+      p[1] = INT_TO_FLOAT( param[1] );
+      p[2] = INT_TO_FLOAT( param[2] );
+      p[3] = INT_TO_FLOAT( param[3] );
+   }
+   else {
+      p[0] = (GLfloat) param[0];
+      p[1] = p[2] = p[3] = 0;  /* init to zero, just to be safe */
+   }
+   _mesa_TexEnvfv( target, pname, p );
+}
+
+
+void GLAPIENTRY
+_mesa_GetTexEnvfv( GLenum target, GLenum pname, GLfloat *params )
+{
+   GLuint maxUnit;
+   const struct gl_texture_unit *texUnit;
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
+      ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxTextureImageUnits;
+   if (ctx->Texture.CurrentUnit >= maxUnit) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnvfv(current unit)");
+      return;
+   }
+
+   texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+
+   if (target == GL_TEXTURE_ENV) {
+      switch (pname) {
+         case GL_TEXTURE_ENV_MODE:
+            *params = ENUM_TO_FLOAT(texUnit->EnvMode);
+            break;
+         case GL_TEXTURE_ENV_COLOR:
+            COPY_4FV( params, texUnit->EnvColor );
+            break;
+         case GL_COMBINE_RGB:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+               *params = (GLfloat) texUnit->Combine.ModeRGB;
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
+            }
+            break;
+         case GL_COMBINE_ALPHA:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+               *params = (GLfloat) texUnit->Combine.ModeA;
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
+            }
+            break;
+         case GL_SOURCE0_RGB:
+         case GL_SOURCE1_RGB:
+         case GL_SOURCE2_RGB:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+	       const unsigned rgb_idx = pname - GL_SOURCE0_RGB;
+               *params = (GLfloat) texUnit->Combine.SourceRGB[rgb_idx];
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
+            }
+            break;
+         case GL_SOURCE0_ALPHA:
+         case GL_SOURCE1_ALPHA:
+         case GL_SOURCE2_ALPHA:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+	       const unsigned alpha_idx = pname - GL_SOURCE0_ALPHA;
+               *params = (GLfloat) texUnit->Combine.SourceA[alpha_idx];
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
+            }
+            break;
+         case GL_OPERAND0_RGB:
+         case GL_OPERAND1_RGB:
+         case GL_OPERAND2_RGB:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+	       const unsigned op_rgb = pname - GL_OPERAND0_RGB;
+               *params = (GLfloat) texUnit->Combine.OperandRGB[op_rgb];
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
+            }
+            break;
+         case GL_OPERAND0_ALPHA:
+         case GL_OPERAND1_ALPHA:
+         case GL_OPERAND2_ALPHA:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+	       const unsigned op_alpha = pname - GL_OPERAND0_ALPHA;
+               *params = (GLfloat) texUnit->Combine.OperandA[op_alpha];
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
+            }
+            break;
+         case GL_RGB_SCALE:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+               if (texUnit->Combine.ScaleShiftRGB == 0)
+                  *params = 1.0;
+               else if (texUnit->Combine.ScaleShiftRGB == 1)
+                  *params = 2.0;
+               else
+                  *params = 4.0;
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
+               return;
+            }
+            break;
+         case GL_ALPHA_SCALE:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+               if (texUnit->Combine.ScaleShiftA == 0)
+                  *params = 1.0;
+               else if (texUnit->Combine.ScaleShiftA == 1)
+                  *params = 2.0;
+               else
+                  *params = 4.0;
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
+               return;
+            }
+            break;
+         default:
+            _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname=0x%x)", pname);
+      }
+   }
+   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
+      /* GL_EXT_texture_lod_bias */
+      if (!ctx->Extensions.EXT_texture_lod_bias) {
+	 _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
+	 return;
+      }
+      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
+         *params = texUnit->LodBias;
+      }
+      else {
+         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
+	 return;
+      }
+   }
+   else if (target == GL_POINT_SPRITE_NV) {
+      /* GL_ARB_point_sprite / GL_NV_point_sprite */
+      if (!ctx->Extensions.NV_point_sprite
+	  && !ctx->Extensions.ARB_point_sprite) {
+         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
+         return;
+      }
+      if (pname == GL_COORD_REPLACE_NV) {
+         *params = (GLfloat) ctx->Point.CoordReplace[ctx->Texture.CurrentUnit];
+      }
+      else {
+         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
+         return;
+      }
+   }
+   else {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
+      return;
+   }
+}
+
+
+void GLAPIENTRY
+_mesa_GetTexEnviv( GLenum target, GLenum pname, GLint *params )
+{
+   GLuint maxUnit;
+   const struct gl_texture_unit *texUnit;
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
+      ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxTextureImageUnits;
+   if (ctx->Texture.CurrentUnit >= maxUnit) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnviv(current unit)");
+      return;
+   }
+
+   texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+
+   if (target == GL_TEXTURE_ENV) {
+      switch (pname) {
+         case GL_TEXTURE_ENV_MODE:
+            *params = (GLint) texUnit->EnvMode;
+            break;
+         case GL_TEXTURE_ENV_COLOR:
+            params[0] = FLOAT_TO_INT( texUnit->EnvColor[0] );
+            params[1] = FLOAT_TO_INT( texUnit->EnvColor[1] );
+            params[2] = FLOAT_TO_INT( texUnit->EnvColor[2] );
+            params[3] = FLOAT_TO_INT( texUnit->EnvColor[3] );
+            break;
+         case GL_COMBINE_RGB:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+               *params = (GLint) texUnit->Combine.ModeRGB;
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
+            }
+            break;
+         case GL_COMBINE_ALPHA:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+               *params = (GLint) texUnit->Combine.ModeA;
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
+            }
+            break;
+         case GL_SOURCE0_RGB:
+         case GL_SOURCE1_RGB:
+         case GL_SOURCE2_RGB:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+	       const unsigned rgb_idx = pname - GL_SOURCE0_RGB;
+               *params = (GLint) texUnit->Combine.SourceRGB[rgb_idx];
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
+            }
+            break;
+         case GL_SOURCE0_ALPHA:
+         case GL_SOURCE1_ALPHA:
+         case GL_SOURCE2_ALPHA:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+	       const unsigned alpha_idx = pname - GL_SOURCE0_ALPHA;
+               *params = (GLint) texUnit->Combine.SourceA[alpha_idx];
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
+            }
+            break;
+         case GL_OPERAND0_RGB:
+         case GL_OPERAND1_RGB:
+         case GL_OPERAND2_RGB:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+	       const unsigned op_rgb = pname - GL_OPERAND0_RGB;
+               *params = (GLint) texUnit->Combine.OperandRGB[op_rgb];
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
+            }
+            break;
+         case GL_OPERAND0_ALPHA:
+         case GL_OPERAND1_ALPHA:
+         case GL_OPERAND2_ALPHA:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+	       const unsigned op_alpha = pname - GL_OPERAND0_ALPHA;
+               *params = (GLint) texUnit->Combine.OperandA[op_alpha];
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
+            }
+            break;
+         case GL_RGB_SCALE:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+               if (texUnit->Combine.ScaleShiftRGB == 0)
+                  *params = 1;
+               else if (texUnit->Combine.ScaleShiftRGB == 1)
+                  *params = 2;
+               else
+                  *params = 4;
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
+               return;
+            }
+            break;
+         case GL_ALPHA_SCALE:
+            if (ctx->Extensions.EXT_texture_env_combine ||
+                ctx->Extensions.ARB_texture_env_combine) {
+               if (texUnit->Combine.ScaleShiftA == 0)
+                  *params = 1;
+               else if (texUnit->Combine.ScaleShiftA == 1)
+                  *params = 2;
+               else
+                  *params = 4;
+            }
+            else {
+               _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)");
+               return;
+            }
+            break;
+         default:
+            _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname=0x%x)",
+                        pname);
+      }
+   }
+   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
+      /* GL_EXT_texture_lod_bias */
+      if (!ctx->Extensions.EXT_texture_lod_bias) {
+	 _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
+	 return;
+      }
+      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
+         *params = (GLint) texUnit->LodBias;
+      }
+      else {
+         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
+	 return;
+      }
+   }
+   else if (target == GL_POINT_SPRITE_NV) {
+      /* GL_ARB_point_sprite / GL_NV_point_sprite */
+      if (!ctx->Extensions.NV_point_sprite
+	  && !ctx->Extensions.ARB_point_sprite) {
+         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
+         return;
+      }
+      if (pname == GL_COORD_REPLACE_NV) {
+         *params = (GLint) ctx->Point.CoordReplace[ctx->Texture.CurrentUnit];
+      }
+      else {
+         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
+         return;
+      }
+   }
+   else {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
+      return;
+   }
+}
+
+