Keith Packard <kei...@keithp.com> writes: > This just adds a bunch of support code to construct shaders from > 'facets', which bundle attributes needed for each layer of the > rendering system. At this point, that includes only the primtive and > the fill stuff. > > Signed-off-by: Keith Packard <kei...@keithp.com>
> diff --git a/glamor/glamor_transform.c b/glamor/glamor_transform.c
> new file mode 100644
> index 0000000..f5a6bb2
> --- /dev/null
> +++ b/glamor/glamor_transform.c
> +
> + /* A tricky computation to find the right value for the two linear
> functions
> + * that transform rendering coordinates to pixmap coordinates
> + *
> + * pixmap_x = render_x + drawable->x + off_x
> + * pixmap_y = render_y + drawable->y + off_y
> + *
> + * gl_x = pixmap_x * 2 / width - 1
> + * gl_y = pixmap_y * 2 / height - 1
> + *
> + * gl_x = (render_x + drawable->x + off_x) * 2 / width - 1
> + *
> + * gl_x = (render_x) * 2 / width + (drawable->x + off_x) * 2 / width - 1
> + *
> + * To get GL_POINTS drawn in the right spot, we need to adjust the
> + * coordinates by 1/2 a pixel. This doesn't hurt rectangles at
> + * all, so we just always do it. If we need to change someday, we
> + * can add a parameter to this function
This comment is stale now that center_offset exists.
> +
> + if (do_drawable_translate) {
> + off_x += drawable->x;
> + off_y += drawable->y;
> + }
> +
> + if (center_offset)
> + center_adjust = 0.5f;
> +
> + glUniform4f(matrix_uniform_location,
> + scale_x, (off_x + center_adjust) * scale_x - 1.0f,
> + scale_y, (off_y + center_adjust) * scale_y - 1.0f);
> +
> + glamor_set_destination_pixmap_fbo(glamor_pixmap_fbo_at(pixmap_priv,
> box_x, box_y),
> + 0, 0, w, h);
> +}
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