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v3d: Handle a no-intersection scissor even if it's outside of the VP.

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The min/maxes ended up producing a negative clip width/height for
dEQP-GLES3.functional.fragment_ops.scissor.outside_render_line.  Just make
sure they stay at 0 (or v3d 3.x's workaround) if that happens.
This commit is contained in:
Eric Anholt
2018-06-14 18:05:50 -07:00
parent 9aa670e52a
commit 4106f6ce54
1 changed files with 8 additions and 10 deletions
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18
src/gallium/drivers/v3d/v3dx_emit.c
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@@ -343,20 +343,18 @@ v3dX(emit_state)(struct pipe_context *pctx)
cl_emit(&job->bcl, CLIP_WINDOW, clip) {
clip.clip_window_left_pixel_coordinate = minx;
clip.clip_window_bottom_pixel_coordinate = miny;
clip.clip_window_width_in_pixels = maxx - minx;
clip.clip_window_height_in_pixels = maxy - miny;
#if V3D_VERSION < 41
/* The HW won't entirely clip out when scissor w/h is
* 0. Just treat it the same as rasterizer discard.
*/
if (clip.clip_window_width_in_pixels == 0 ||
clip.clip_window_height_in_pixels == 0) {
if (maxx > minx && maxy > miny) {
clip.clip_window_width_in_pixels = maxx - minx;
clip.clip_window_height_in_pixels = maxy - miny;
} else if (V3D_VERSION < 41) {
/* The HW won't entirely clip out when scissor
* w/h is 0. Just treat it the same as
* rasterizer discard.
*/
rasterizer_discard = true;
clip.clip_window_width_in_pixels = 1;
clip.clip_window_height_in_pixels = 1;
}
#endif
}
job->draw_min_x = MIN2(job->draw_min_x, minx);