On Fri, Feb 5, 2016 at 4:11 PM, Miklós Máté <mtm...@gmail.com> wrote:
> v2: comment about the purpose of the code
> ---
> src/mesa/main/teximage.c | 32 ++++++++++++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
>
> diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
> index 50141be..cac05d5 100644
> --- a/src/mesa/main/teximage.c
> +++ b/src/mesa/main/teximage.c
> @@ -3486,6 +3486,21 @@ formats_differ_in_component_sizes(mesa_format f1,
> mesa_format f2)
> return GL_FALSE;
> }
>
> +static GLboolean
> +canAvoidRealloc(struct gl_texture_image *texImage, GLenum internalFormat,
> + GLint x, GLint y, GLsizei width, GLsizei height, GLint border)
> +{
> + if (texImage->InternalFormat != internalFormat)
> + return false;
> + if (texImage->Border != border)
> + return false;
> + if (texImage->Width2 != width)
> + return false;
> + if (texImage->Height2 != height)
> + return false;
> + return true;
Also need to compare the texFormat no?
> +}
> +
> /**
> * Implement the glCopyTexImage1/2D() functions.
> */
> @@ -3526,6 +3541,23 @@ copyteximage(struct gl_context *ctx, GLuint dims,
> texObj = _mesa_get_current_tex_object(ctx, target);
> assert(texObj);
>
> + /* First check if reallocating the texture buffer can be avoided.
> + * Without the realloc the copy can be 20x faster.
> + */
> + _mesa_lock_texture(ctx, texObj);
> + {
> + texImage = _mesa_select_tex_image(texObj, target, level);
> + if (texImage && canAvoidRealloc(texImage, internalFormat,
> + x, y, width, height, border)) {
> + _mesa_unlock_texture(ctx, texObj);
> + /*_mesa_debug(ctx, "using shortcut\n");*/
> + return _mesa_copy_texture_sub_image(ctx, dims, texObj, target,
> level,
> + 0, 0, 0, x, y, width, height, "CopyTexImage");
> + }
> + /*_mesa_debug(ctx, "can't shortcut\n");*/
> + }
> + _mesa_unlock_texture(ctx, texObj);
> +
> texFormat = _mesa_choose_texture_format(ctx, texObj, target, level,
> internalFormat, GL_NONE, GL_NONE);
>
> --
> 2.7.0
>
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