/**
* Specify the depth stencil format for the draw pipeline. This function
* determines the Minimum Resolvable Depth factor for polygon offset.
* This factor potentially depends on the number of Z buffer bits,
* the rasterization algorithm and the arithmetic performed on Z
* values between vertex shading and rasterization.
*/
void draw_set_zs_format(struct draw_context *draw, enum pipe_format format)
{
const struct util_format_description *desc = util_format_description(format);
draw->floating_point_depth =
(util_get_depth_format_type(desc) == UTIL_FORMAT_TYPE_FLOAT);
draw->mrd = util_get_depth_format_mrd(desc);
}
/**
* Set the framebuffer surface info: color buffers, zbuffer, stencil buffer.
*/
void
llvmpipe_set_framebuffer_state(struct pipe_context *pipe,
const struct pipe_framebuffer_state *fb)
{
struct llvmpipe_context *lp = llvmpipe_context(pipe);
boolean changed = !util_framebuffer_state_equal(&lp->framebuffer, fb);
assert(fb->width <= LP_MAX_WIDTH);
assert(fb->height <= LP_MAX_HEIGHT);
if (changed) {
util_copy_framebuffer_state(&lp->framebuffer, fb);
if (LP_PERF & PERF_NO_DEPTH) {
pipe_surface_reference(&lp->framebuffer.zsbuf, NULL);
}
/* Tell draw module how deep the Z/depth buffer is.
*
* If no depth buffer is bound, send the utility function the default
* format for no bound depth (PIPE_FORMAT_NONE).
*
* FIXME: mrd constant isn't right should use a value derived from
* current primitive not a constant (for float depth buffers)
*/
lp->mrd = util_get_depth_format_mrd((lp->framebuffer.zsbuf) ?
lp->framebuffer.zsbuf->format : PIPE_FORMAT_NONE);
draw_set_mrd(lp->draw, lp->mrd);
lp_setup_bind_framebuffer( lp->setup, &lp->framebuffer );
lp->dirty |= LP_NEW_FRAMEBUFFER;
}
}
