r300g: Correct viewport setup for SW TCL.

glxgears now renders in the right place on-screen, although it is still
rather...psychedelic.

src/gallium/drivers/r300/r300_context.c

@@ -201,9 +201,6 @@ struct pipe_context* r300_create_context(struct pipe_screen* screen,
         draw_set_rasterize_stage(r300->draw, r300_draw_stage(r300));
         /* Enable Draw's clipping. */
         draw_set_driver_clipping(r300->draw, FALSE);
-        /* Force Draw to never do viewport transform, since we can do
-         * transform in hardware, always. */
-        draw_set_viewport_state(r300->draw, &r300_viewport_identity);
     }
 
     r300_setup_atoms(r300);

src/gallium/drivers/r300/r300_context.h

@@ -321,8 +321,6 @@ struct r300_vertex_element_state {
     struct r300_vertex_stream_state vertex_stream;
 };
 
-extern struct pipe_viewport_state r300_viewport_identity;
-
 struct r300_context {
     /* Parent class */
     struct pipe_context context;

src/gallium/drivers/r300/r300_state.c

@@ -395,13 +395,13 @@ static void r300_set_clip_state(struct pipe_context* pipe,
     if (r300->screen->caps.has_tcl) {
         memcpy(r300->clip_state.state, state, sizeof(struct pipe_clip_state));
         r300->clip_state.size = 29;
+
+        r300->clip_state.dirty = TRUE;
     } else {
         draw_flush(r300->draw);
         draw_set_clip_state(r300->draw, state);
         r300->clip_state.size = 2;
     }
-
-    r300->clip_state.dirty = TRUE;
 }
 
 /* Create a new depth, stencil, and alpha state based on the CSO dsa state.
@@ -1098,6 +1098,13 @@ static void r300_set_viewport_state(struct pipe_context* pipe,
 
     r300->viewport = *state;
 
+    if (r300->draw) {
+        draw_flush(r300->draw);
+        draw_set_viewport_state(r300->draw, state);
+        viewport->vte_control = R300_VTX_XY_FMT | R300_VTX_Z_FMT;
+        return;
+    }
+
     /* Do the transform in HW. */
     viewport->vte_control = R300_VTX_W0_FMT;
 

src/gallium/drivers/r300/r300_state_invariant.c

@@ -27,11 +27,6 @@
 #include "r300_screen.h"
 #include "r300_state_invariant.h"
 
-struct pipe_viewport_state r300_viewport_identity = {
-    .scale = {1.0, 1.0, 1.0, 1.0},
-    .translate = {0.0, 0.0, 0.0, 0.0},
-};
-
 /* Calculate and emit invariant state. This is data that the 3D engine
  * will probably want at the beginning of every CS, but it's not currently
  * handled by any CSO setup, and in addition it doesn't really change much.