---
src/mesa/main/texgetimage.c | 51 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 50 insertions(+), 1 deletion(-)
diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c
index 24df5b6..327a397 100644
--- a/src/mesa/main/texgetimage.c
+++ b/src/mesa/main/texgetimage.c
@@ -1339,7 +1339,56 @@ _mesa_GetCompressedTextureImage(GLuint texture, GLint
level,
/* Must handle special case GL_TEXTURE_CUBE_MAP. */
if (texObj->Target == GL_TEXTURE_CUBE_MAP) {
- assert(texObj->NumLayers >= 6);
+
+ /* Error checking */
+ if (texObj->NumLayers < 6) {
+ /* Not enough image planes for a cube map. The spec does not say
+ * what should happen in this case because the user has always
+ * specified each cube face separately (using
+ * GL_TEXTURE_CUBE_MAP_POSITIVE_X+i) in previous GL versions.
+ * This is addressed in Khronos Bug 13223.
+ */
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glGetCompressedTextureImage("
+ "insufficient cube map storage)");
+ return;
+ }
+
+ /*
+ * What do we do if the user created a texture with the following code
+ * and then called this function with its handle?
+ *
+ * GLuint tex;
+ * glCreateTextures(GL_TEXTURE_CUBE_MAP, 1, &tex);
+ * glBindTexture(GL_TEXTURE_CUBE_MAP, tex);
+ * glCompressedTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, ...);
+ * glCompressedTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, ...);
+ * glCompressedTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, ...);
+ * // Note: GL_TEXTURE_CUBE_MAP_NEGATIVE_Y not set, or given the
+ * // wrong format, or given the wrong size, etc.
+ * glCompressedTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, ...);
+ * glCompressedTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, ...);
+ *
+ * A bug has been filed against the spec for this case. In the
+ * meantime, we will check for cube completeness.
+ *
+ * According to Section 8.17 Texture Completeness in the OpenGL 4.5
+ * Core Profile spec (30.10.2014):
+ * "[A] cube map texture is cube complete if the
+ * following conditions all hold true: The [base level] texture
+ * images of each of the six cube map faces have identical, positive,
+ * and square dimensions. The [base level] images were each specified
+ * with the same internal format."
+ *
+ * It seems reasonable to check for cube completeness of an arbitrary
+ * level here so that the returned data has a consistent format and size
+ * and therefore fits in the user's buffer.
+ */
+ if (!_mesa_cube_level_complete(texObj, level)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glGetCompressedTextureImage(cube map incomplete)");
+ return;
+ }
/* Copy each face. */
for (i = 0; i < 6; ++i) {
--
2.1.0
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/mesa-dev
