Fix size test bug in _mesa_test_proxy_teximage().

width/height/depth == 0 is a legal texture size (no error generated).
Later, the texture will be considered incomplete, however, and texturing
will effectively be disabled.
See bug 11309.

src/mesa/main/teximage.c

@@ -1264,6 +1264,10 @@ _mesa_init_teximage_fields(GLcontext *ctx, GLenum target,
  * A hardware driver might override this function if, for example, the
  * max 3D texture size is 512x512x64 (i.e. not a cube).
  *
+ * Note that width, height, depth == 0 is not an error.  However, a
+ * texture with zero width/height/depth will be considered "incomplete"
+ * and texturing will effectively be disabled.
+ *
  * \param target  one of GL_PROXY_TEXTURE_1D, GL_PROXY_TEXTURE_2D,
  *                GL_PROXY_TEXTURE_3D, GL_PROXY_TEXTURE_RECTANGLE_NV,
  *                GL_PROXY_TEXTURE_CUBE_MAP_ARB.
@@ -1293,7 +1297,7 @@ _mesa_test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
       maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
       if (width < 2 * border || width > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(width - 2 * border) != 1) ||
+           width >0 && _mesa_bitcount(width - 2 * border) != 1) ||
           level >= ctx->Const.MaxTextureLevels) {
          /* bad width or level */
          return GL_FALSE;
@@ -1303,10 +1307,10 @@ _mesa_test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
       maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
       if (width < 2 * border || width > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(width - 2 * border) != 1) ||
+           width > 0 && _mesa_bitcount(width - 2 * border) != 1) ||
           height < 2 * border || height > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(height - 2 * border) != 1) ||
+           height > 0 && _mesa_bitcount(height - 2 * border) != 1) ||
           level >= ctx->Const.MaxTextureLevels) {
          /* bad width or height or level */
          return GL_FALSE;
@@ -1316,21 +1320,21 @@ _mesa_test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
       maxSize = 1 << (ctx->Const.Max3DTextureLevels - 1);
       if (width < 2 * border || width > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(width - 2 * border) != 1) ||
+           width > 0 && _mesa_bitcount(width - 2 * border) != 1) ||
           height < 2 * border || height > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(height - 2 * border) != 1) ||
+           height > 0 && _mesa_bitcount(height - 2 * border) != 1) ||
           depth < 2 * border || depth > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(depth - 2 * border) != 1) ||
+           depth > 0 && _mesa_bitcount(depth - 2 * border) != 1) ||
           level >= ctx->Const.Max3DTextureLevels) {
          /* bad width or height or depth or level */
          return GL_FALSE;
       }
       return GL_TRUE;
    case GL_PROXY_TEXTURE_RECTANGLE_NV:
-      if (width < 1 || width > ctx->Const.MaxTextureRectSize ||
-          height < 1 || height > ctx->Const.MaxTextureRectSize ||
+      if (width < 0 || width > ctx->Const.MaxTextureRectSize ||
+          height < 0 || height > ctx->Const.MaxTextureRectSize ||
           level != 0) {
          /* bad width or height or level */
          return GL_FALSE;
@@ -1340,10 +1344,10 @@ _mesa_test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
       maxSize = 1 << (ctx->Const.MaxCubeTextureLevels - 1);
       if (width < 2 * border || width > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(width - 2 * border) != 1) ||
+           width > 0 && _mesa_bitcount(width - 2 * border) != 1) ||
           height < 2 * border || height > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(height - 2 * border) != 1) ||
+           height > 0 && _mesa_bitcount(height - 2 * border) != 1) ||
           level >= ctx->Const.MaxCubeTextureLevels) {
          /* bad width or height */
          return GL_FALSE;
@@ -1353,7 +1357,7 @@ _mesa_test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
       maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
       if (width < 2 * border || width > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(width - 2 * border) != 1) ||
+           width > 0 && _mesa_bitcount(width - 2 * border) != 1) ||
           level >= ctx->Const.MaxTextureLevels) {
          /* bad width or level */
          return GL_FALSE;
@@ -1367,10 +1371,10 @@ _mesa_test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
       maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
       if (width < 2 * border || width > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(width - 2 * border) != 1) ||
+           width > 0 && _mesa_bitcount(width - 2 * border) != 1) ||
           height < 2 * border || height > 2 + maxSize ||
           (!ctx->Extensions.ARB_texture_non_power_of_two &&
-           _mesa_bitcount(height - 2 * border) != 1) ||
+           height > 0 && _mesa_bitcount(height - 2 * border) != 1) ||
           level >= ctx->Const.MaxTextureLevels) {
          /* bad width or height or level */
          return GL_FALSE;