freedreno/a4xx: fix fragcoord.z + fragdepth

It seems like disabling earlyz on a4xx also, by defaults, disables
fragcoord.z to the FS.  For frag shaders that both read fragcoord(.z)
and write fragdepth, we need to set some extra bits to prevent a
lockup.

This lets us get rid of the hack of disabling fragcoord.z (which
prevented 0ad from lockups, but resulted in rendering corruption).  Also
fixes fbo-depth-sample-compare.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

diff --git a/src/gallium/drivers/freedreno/a4xx/fd4_emit.c b/src/gallium/drivers/freedreno/a4xx/fd4_emit.c
index f220fc7ac1fc0481ab268d7a74833fc5b20f2f61..b9a281497222174bf7f72f8398ca93ae8c5fa285 100644 (file)
--- a/src/gallium/drivers/freedreno/a4xx/fd4_emit.c
+++ b/src/gallium/drivers/freedreno/a4xx/fd4_emit.c
@@ -529,14 +529,16 @@ fd4_emit_state(struct fd_context *ctx, struct fd_ringbuffer *ring,
 
                OUT_PKT0(ring, REG_A4XX_RB_DEPTH_CONTROL, 1);
                OUT_RING(ring, zsa->rb_depth_control |
-                               COND(fragz, A4XX_RB_DEPTH_CONTROL_EARLY_Z_DISABLE));
+                               COND(fragz, A4XX_RB_DEPTH_CONTROL_EARLY_Z_DISABLE) |
+                               COND(fragz && fp->frag_coord, A4XX_RB_DEPTH_CONTROL_FORCE_FRAGZ_TO_FS));
 
                /* maybe this register/bitfield needs a better name.. this
                 * appears to be just disabling early-z
                 */
                OUT_PKT0(ring, REG_A4XX_GRAS_ALPHA_CONTROL, 1);
                OUT_RING(ring, zsa->gras_alpha_control |
-                               COND(fragz, A4XX_GRAS_ALPHA_CONTROL_ALPHA_TEST_ENABLE));
+                               COND(fragz, A4XX_GRAS_ALPHA_CONTROL_ALPHA_TEST_ENABLE) |
+                               COND(fragz && fp->frag_coord, A4XX_GRAS_ALPHA_CONTROL_FORCE_FRAGZ_TO_FS));
        }
 
        if (dirty & FD_DIRTY_RASTERIZER) {

diff --git a/src/gallium/drivers/freedreno/a4xx/fd4_program.c b/src/gallium/drivers/freedreno/a4xx/fd4_program.c
index 0e861b90b120f35682eb655292939309cac043f8..32b8fce161364540944cafdf6d91c9220e611fc1 100644 (file)
--- a/src/gallium/drivers/freedreno/a4xx/fd4_program.c
+++ b/src/gallium/drivers/freedreno/a4xx/fd4_program.c
@@ -420,9 +420,7 @@ fd4_program_emit(struct fd_ringbuffer *ring, struct fd4_emit *emit,
                        COND(s[FS].v->frag_face, A4XX_RB_RENDER_CONTROL2_FACENESS) |
                        COND(s[FS].v->frag_coord, A4XX_RB_RENDER_CONTROL2_XCOORD |
                                        A4XX_RB_RENDER_CONTROL2_YCOORD |
-// TODO enabling gl_FragCoord.z is causing lockups on 0ad (but seems
-// to work everywhere else).
-//                                     A4XX_RB_RENDER_CONTROL2_ZCOORD |
+                                       A4XX_RB_RENDER_CONTROL2_ZCOORD |
                                        A4XX_RB_RENDER_CONTROL2_WCOORD));
 
        OUT_PKT0(ring, REG_A4XX_RB_FS_OUTPUT_REG, 1);