Mesa (master): mesa: expose dimension check for glTex*Storage functions

[Tapani Pälli]

Module: Mesa
Branch: master
Commit: a342becc490b38436396e98ee653a6b81c037663
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a342becc490b38436396e98ee653a6b81c037663

Author: Tapani Pälli <tapani.palli at intel.com>
Date:   Mon Aug 10 10:50:06 2015 +0300

mesa: expose dimension check for glTex*Storage functions

This is done so that following patch can use it to verify dimensions
for multisample variants of glTex*Storage.

v2: move function to header, use bool instead GLboolean
v3: small changes, cleanup

Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
Reviewed-by: Anuj Phogat <anuj.phogat at gmail.com>
Reviewed-by: Timothy Arceri <t_arceri at yahoo.com.au>

---

 src/mesa/main/texstorage.c |    2 +-
 src/mesa/main/texstorage.h |   21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/mesa/main/texstorage.c b/src/mesa/main/texstorage.c
index 4a2cc60..db2b63d 100644
--- a/src/mesa/main/texstorage.c
+++ b/src/mesa/main/texstorage.c
@@ -287,7 +287,7 @@ tex_storage_error_check(struct gl_context *ctx,
     * order to allow meta functions to use legacy formats. */
 
    /* size check */
-   if (width < 1 || height < 1 || depth < 1) {
+   if (!_mesa_valid_tex_storage_dim(width, height, depth)) {
       _mesa_error(ctx, GL_INVALID_VALUE,
                   "glTex%sStorage%uD(width, height or depth < 1)",
                   suffix, dims);
diff --git a/src/mesa/main/texstorage.h b/src/mesa/main/texstorage.h
index 6f5495f..033ecb7 100644
--- a/src/mesa/main/texstorage.h
+++ b/src/mesa/main/texstorage.h
@@ -38,6 +38,27 @@ _mesa_texture_storage(struct gl_context *ctx, GLuint dims,
                       GLenum internalformat, GLsizei width,
                       GLsizei height, GLsizei depth, bool dsa);
 
+/**
+ * Texture width, height and depth check shared with the
+ * multisample variants of TexStorage functions.
+ *
+ * From OpenGL 4.5 Core spec, page 260 (section 8.19)
+ *
+ *     "An INVALID_VALUE error is generated if width, height, depth
+ *     or levels are less than 1, for commands with the corresponding
+ *     parameters."
+ *
+ * (referring to TextureStorage* commands, these also match values
+ * specified for OpenGL ES 3.1.)
+ */
+static inline bool
+_mesa_valid_tex_storage_dim(GLsizei width, GLsizei height, GLsizei depth)
+{
+   if (width < 1 || height < 1 || depth < 1)
+      return false;
+   return true;
+}
+
 /*@}*/
 
 /**