svga: Condition preemptive flush on draw emission

On ultra high resolution modes, the preemptive flush flag can be
set midway through command submission, a condition that cannot be
recovered from a flush-retry, causing rendering artifacts.

This patch prevents a preemtive_flush until a draw has been
emitted.

Signed-off-by: Sinclair Yeh <[email protected]>
Reviewed-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Charmaine Lee <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

3 files changed, 15 insertions, 0 deletions

diff --git a/src/gallium/drivers/svga/svga_cmd.c b/src/gallium/drivers/svga/svga_cmd.c
index d3cf52f08e2..0e1e332d6cb 100644
--- a/src/gallium/drivers/svga/svga_cmd.c
+++ b/src/gallium/drivers/svga/svga_cmd.c
@@ -1016,6 +1016,8 @@ SVGA3D_BeginDrawPrimitives(struct svga_winsys_context *swc,
    *decls = declArray;
    *ranges = rangeArray;
 
+   swc->hints |= SVGA_HINT_FLAG_DRAW_EMITTED;
+
    return PIPE_OK;
 }
 
diff --git a/src/gallium/drivers/svga/svga_cmd_vgpu10.c b/src/gallium/drivers/svga/svga_cmd_vgpu10.c
index 596ba953cd2..5c121089f91 100644
--- a/src/gallium/drivers/svga/svga_cmd_vgpu10.c
+++ b/src/gallium/drivers/svga/svga_cmd_vgpu10.c
@@ -535,6 +535,7 @@ SVGA3D_vgpu10_Draw(struct svga_winsys_context *swc,
 
    SVGA3D_COPY_BASIC_2(vertexCount, startVertexLocation);
 
+   swc->hints |= SVGA_HINT_FLAG_DRAW_EMITTED;
    swc->commit(swc);
    return PIPE_OK;
 }
@@ -550,6 +551,7 @@ SVGA3D_vgpu10_DrawIndexed(struct svga_winsys_context *swc,
    SVGA3D_COPY_BASIC_3(indexCount, startIndexLocation,
                        baseVertexLocation);
 
+   swc->hints |= SVGA_HINT_FLAG_DRAW_EMITTED;
    swc->commit(swc);
    return PIPE_OK;
 }
@@ -566,6 +568,7 @@ SVGA3D_vgpu10_DrawInstanced(struct svga_winsys_context *swc,
    SVGA3D_COPY_BASIC_4(vertexCountPerInstance, instanceCount,
                        startVertexLocation, startInstanceLocation);
 
+   swc->hints |= SVGA_HINT_FLAG_DRAW_EMITTED;
    swc->commit(swc);
    return PIPE_OK;
 }
@@ -584,6 +587,8 @@ SVGA3D_vgpu10_DrawIndexedInstanced(struct svga_winsys_context *swc,
                        startIndexLocation, baseVertexLocation,
                        startInstanceLocation);
 
+
+   swc->hints |= SVGA_HINT_FLAG_DRAW_EMITTED;
    swc->commit(swc);
    return PIPE_OK;
 }
@@ -593,6 +598,7 @@ SVGA3D_vgpu10_DrawAuto(struct svga_winsys_context *swc)
 {
    SVGA3D_CREATE_COMMAND(DrawAuto, DRAW_AUTO);
 
+   swc->hints |= SVGA_HINT_FLAG_DRAW_EMITTED;
    swc->commit(swc);
    return PIPE_OK;
 }
diff --git a/src/gallium/drivers/svga/svga_winsys.h b/src/gallium/drivers/svga/svga_winsys.h
index c750603989f..3129e46ed06 100644
--- a/src/gallium/drivers/svga/svga_winsys.h
+++ b/src/gallium/drivers/svga/svga_winsys.h
@@ -85,6 +85,8 @@ struct winsys_handle;
 #define SVGA_QUERY_FLAG_SET        (1 << 0)
 #define SVGA_QUERY_FLAG_REF        (1 << 1)
 
+#define SVGA_HINT_FLAG_DRAW_EMITTED (1 << 0)
+
 /** Opaque surface handle */
 struct svga_winsys_surface;
 
@@ -213,6 +215,11 @@ struct svga_winsys_context
    uint32 cid;
 
    /**
+    * Flags to hint the current context state
+    */
+   uint32 hints;
+
+   /**
     ** BEGIN new functions for guest-backed surfaces.
     **/