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mesa: Handle uninitialized textures like other textures in get_tex_level_parameter_image

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Instead of catching the special case early, handle it by constructing a
fake gl_texture_image that will cause the values required by the OpenGL
4.0 spec to be returned.

Previously, calling

    glGenTextures(1, &t);
    glBindTexture(GL_TEXTURE_2D, t);
    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, 0xDEADBEEF, &value);

would not generate an error.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Suggested-by: Brian Paul <brianp@vmware.com>
Cc: "10.2" <mesa-stable@lists.freedesktop.org>
Cc: Anuj Phogat <anuj.phogat@gmail.com>
(cherry picked from commit ee58c71a65)
This commit is contained in:
Ian Romanick 2014-06-17 14:58:14 -07:00 • committed by Carl Worth
parent 8b056fc486
commit d82ca4e2b2
1 changed files with 6 additions and 5 deletions
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11
src/mesa/main/texparam.c
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@ -1051,6 +1051,7 @@ get_tex_level_parameter_image(struct gl_context *ctx,
GLenum pname, GLint *params)
{
const struct gl_texture_image *img = NULL;
struct gl_texture_image dummy_image;
mesa_format texFormat;
img = _mesa_select_tex_image(ctx, texObj, target, level);
@ -1062,12 +1063,12 @@ get_tex_level_parameter_image(struct gl_context *ctx,
* instead of 1. TEXTURE_COMPONENTS is deprecated; always
* use TEXTURE_INTERNAL_FORMAT."
*/
memset(&dummy_image, 0, sizeof(dummy_image));
dummy_image.TexFormat = MESA_FORMAT_NONE;
dummy_image.InternalFormat = GL_RGBA;
dummy_image._BaseFormat = GL_NONE;
if (pname == GL_TEXTURE_INTERNAL_FORMAT)
*params = GL_RGBA;
else
*params = 0;
return;
img = &dummy_image;
}
texFormat = img->TexFormat;