From ef31f60b12abc2109568fb8d9a2aaa70ec5c71cc Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Fri, 18 Oct 2002 18:03:04 +0000
Subject: [PATCH] new _mesa_max_texture_levels() helper function - not used
 everywhere yet

---
 src/mesa/main/teximage.c | 66 ++++++++++++++++++++++++----------------
 src/mesa/main/teximage.h |  5 ++-
 src/mesa/main/texstore.c | 28 +++--------------
 3 files changed, 48 insertions(+), 51 deletions(-)

diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index e33a3986756..74b526e0f3d 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -1,4 +1,4 @@
-/* $Id: teximage.c,v 1.121 2002/10/18 13:24:08 brianp Exp $ */
+/* $Id: teximage.c,v 1.122 2002/10/18 18:03:04 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -583,6 +583,41 @@ _mesa_select_tex_image(GLcontext *ctx, const struct gl_texture_unit *texUnit,
 }
 
 
+/*
+ * Return the maximum number of allows mipmap levels for the given
+ * texture target.
+ */
+GLint
+_mesa_max_texture_levels(GLcontext *ctx, GLenum target)
+{
+   switch (target) {
+   case GL_TEXTURE_1D:
+   case GL_PROXY_TEXTURE_1D:
+   case GL_TEXTURE_2D:
+   case GL_PROXY_TEXTURE_2D:
+      return ctx->Const.MaxTextureLevels;
+   case GL_TEXTURE_3D:
+   case GL_PROXY_TEXTURE_3D:
+      return ctx->Const.Max3DTextureLevels;
+   case GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB:
+   case GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB:
+   case GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB:
+   case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB:
+   case GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB:
+   case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB:
+   case GL_PROXY_TEXTURE_CUBE_MAP_ARB:
+      return ctx->Const.MaxCubeTextureLevels;
+      break;
+   case GL_TEXTURE_RECTANGLE_NV:
+   case GL_PROXY_TEXTURE_RECTANGLE_NV:
+      return 1;
+      break;
+   default:
+      return 0; /* bad target */
+   }
+}
+
+
 
 #if 000 /* not used anymore */
 /*
@@ -1455,20 +1490,8 @@ _mesa_GetTexImage( GLenum target, GLint level, GLenum format,
       return;
    }
 
-   if (target == GL_TEXTURE_1D || target == GL_TEXTURE_2D) {
-      maxLevels = ctx->Const.MaxTextureLevels;
-   }
-   else if (target == GL_TEXTURE_3D) {
-      maxLevels = ctx->Const.Max3DTextureLevels;
-   }
-   else if (target == GL_TEXTURE_RECTANGLE_NV) {
-      maxLevels = 1;
-   }
-   else {
-      maxLevels = ctx->Const.MaxCubeTextureLevels;
-   }
-
-   ASSERT(maxLevels > 0);
+   maxLevels = _mesa_max_texture_levels(ctx, target);
+   ASSERT(maxLevels > 0);  /* 0 indicates bad target, caught above */
 
    if (level < 0 || level >= maxLevels) {
       _mesa_error( ctx, GL_INVALID_VALUE, "glGetTexImage(level)" );
@@ -2887,17 +2910,8 @@ _mesa_GetCompressedTexImageARB(GLenum target, GLint level, GLvoid *img)
       return;
    }
 
-   if (target == GL_TEXTURE_1D || target == GL_TEXTURE_2D) {
-      maxLevels = ctx->Const.MaxTextureLevels;
-   }
-   else if (target == GL_TEXTURE_3D) {
-      maxLevels = ctx->Const.Max3DTextureLevels;
-   }
-   else {
-      maxLevels = ctx->Const.MaxCubeTextureLevels;
-   }
-
-   ASSERT(maxLevels > 0);
+   maxLevels = _mesa_max_texture_levels(ctx, target);
+   ASSERT(maxLevels > 0); /* 0 indicates bad target, caught above */
 
    if (level < 0 || level >= maxLevels) {
       _mesa_error(ctx, GL_INVALID_VALUE, "glGetCompressedTexImageARB(level)");
diff --git a/src/mesa/main/teximage.h b/src/mesa/main/teximage.h
index 03b052c414e..8cbc0d66152 100644
--- a/src/mesa/main/teximage.h
+++ b/src/mesa/main/teximage.h
@@ -1,4 +1,4 @@
-/* $Id: teximage.h,v 1.21 2002/06/15 03:03:09 brianp Exp $ */
+/* $Id: teximage.h,v 1.22 2002/10/18 18:03:07 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -70,6 +70,9 @@ _mesa_select_tex_image(GLcontext *ctx, const struct gl_texture_unit *texUnit,
                        GLenum target, GLint level);
 
 
+extern GLint
+_mesa_max_texture_levels(GLcontext *ctx, GLenum target);
+
 
 /*** API entry point functions ***/
 
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index 91bd6357549..2be6e476458 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -1,4 +1,4 @@
-/* $Id: texstore.c,v 1.43 2002/10/18 17:41:45 brianp Exp $ */
+/* $Id: texstore.c,v 1.44 2002/10/18 18:03:08 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -1897,34 +1897,14 @@ _mesa_generate_mipmap(GLcontext *ctx, GLenum target,
    const struct gl_texture_format *convertFormat;
    const GLubyte *srcData;
    GLubyte *dstData;
-   GLint level;
-   GLint maxLevels = 0;
+   GLint level, maxLevels;
 
    ASSERT(texObj);
    srcImage = texObj->Image[texObj->BaseLevel];
    ASSERT(srcImage);
 
-   switch (texObj->Target) {
-   case GL_TEXTURE_1D:
-      maxLevels = ctx->Const.MaxTextureLevels;
-      break;
-   case GL_TEXTURE_2D:
-      maxLevels = ctx->Const.MaxTextureLevels;
-      break;
-   case GL_TEXTURE_3D:
-      maxLevels = ctx->Const.Max3DTextureLevels;
-      break;
-   case GL_TEXTURE_CUBE_MAP_ARB:
-      maxLevels = ctx->Const.MaxCubeTextureLevels;
-      break;
-   case GL_TEXTURE_RECTANGLE_NV:
-      maxLevels = 1;
-      break;
-   default:
-      _mesa_problem(ctx,
-                    "Bad texture object dimension in _mesa_generate_mipmaps");
-      return;
-   }
+   maxLevels = _mesa_max_texture_levels(ctx, texObj->Target);
+   ASSERT(maxLevels > 0);  /* bad target */
 
    /* Find convertFormat - the format that do_row() will process */
    if (srcImage->IsCompressed) {
-- 
2.30.2