radeonsi: don't change viewport for blits, use window-space positions

The viewport state was an identity anyway.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/gallium/auxiliary/util/u_blitter.c

@@ -650,7 +650,9 @@ void util_blitter_restore_fragment_states(struct blitter_context *blitter)
    /* XXX check whether these are saved and whether they need to be restored
     * (depending on the operation) */
    pipe->set_stencil_ref(pipe, &ctx->base.saved_stencil_ref);
-   pipe->set_viewport_states(pipe, 0, 1, &ctx->base.saved_viewport);
+
+   if (!blitter->skip_viewport_restore)
+      pipe->set_viewport_states(pipe, 0, 1, &ctx->base.saved_viewport);
 }
 
 static void blitter_check_saved_fb_state(struct blitter_context_priv *ctx)

src/gallium/auxiliary/util/u_blitter.h

@@ -113,6 +113,7 @@ struct blitter_context
    struct pipe_stencil_ref saved_stencil_ref;     /**< stencil ref */
    struct pipe_viewport_state saved_viewport;
    struct pipe_scissor_state saved_scissor;
+   bool skip_viewport_restore;
    bool is_sample_mask_saved;
    unsigned saved_sample_mask;
 

src/gallium/drivers/radeonsi/si_blit.c

@@ -68,7 +68,6 @@ static void si_blitter_begin(struct pipe_context *ctx, enum si_blitter_op op)
 		util_blitter_save_stencil_ref(sctx->blitter, &sctx->stencil_ref.state);
 		util_blitter_save_fragment_shader(sctx->blitter, sctx->ps_shader.cso);
 		util_blitter_save_sample_mask(sctx->blitter, sctx->sample_mask.sample_mask);
-		util_blitter_save_viewport(sctx->blitter, &sctx->viewports.states[0]);
 		util_blitter_save_scissor(sctx->blitter, &sctx->scissors.states[0]);
 	}
 

src/gallium/drivers/radeonsi/si_pipe.c

@@ -255,6 +255,7 @@ static struct pipe_context *si_create_context(struct pipe_screen *screen,
 	if (sctx->blitter == NULL)
 		goto fail;
 	sctx->blitter->draw_rectangle = si_draw_rectangle;
+	sctx->blitter->skip_viewport_restore = true;
 
 	sctx->sample_mask.sample_mask = 0xffff;
 

src/gallium/drivers/radeonsi/si_state_draw.c

@@ -1515,16 +1515,6 @@ void si_draw_rectangle(struct blitter_context *blitter,
 {
 	struct pipe_context *pipe = util_blitter_get_pipe(blitter);
 	struct si_context *sctx = (struct si_context*)pipe;
-	struct pipe_viewport_state viewport;
-
-	/* setup viewport */
-	viewport.scale[0] = 1.0f;
-	viewport.scale[1] = 1.0f;
-	viewport.scale[2] = 1.0f;
-	viewport.translate[0] = 0.0f;
-	viewport.translate[1] = 0.0f;
-	viewport.translate[2] = 0.0f;
-	pipe->set_viewport_states(pipe, 0, 1, &viewport);
 
 	/* Pack position coordinates as signed int16. */
 	sctx->vs_blit_sh_data[0] = (uint32_t)(x1 & 0xffff) |

src/gallium/drivers/radeonsi/si_state_shaders.c

@@ -3442,6 +3442,7 @@ void *si_get_blit_vs(struct si_context *sctx, enum blitter_attrib_type type,
 
 	/* Tell the shader to load VS inputs from SGPRs: */
 	ureg_property(ureg, TGSI_PROPERTY_VS_BLIT_SGPRS, vs_blit_property);
+	ureg_property(ureg, TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION, true);
 
 	/* This is just a pass-through shader with 1-3 MOV instructions. */
 	ureg_MOV(ureg,

src/gallium/drivers/radeonsi/si_state_viewport.c

@@ -63,13 +63,6 @@ static void si_get_scissor_from_viewport(struct si_context *ctx,
 	maxx = vp->scale[0] + vp->translate[0];
 	maxy = vp->scale[1] + vp->translate[1];
 
-	/* r600_draw_rectangle sets this. Disable the scissor. */
-	if (minx == -1 && miny == -1 && maxx == 1 && maxy == 1) {
-		scissor->minx = scissor->miny = 0;
-		scissor->maxx = scissor->maxy = SI_MAX_SCISSOR;
-		return;
-	}
-
 	/* Handle inverted viewports. */
 	if (minx > maxx) {
 		tmp = minx;