X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fdrivers%2Fdri%2Fi965%2Fgen6_viewport_state.c;h=95243f08c5003b8906e70a8f4794aea78d214f1c;hb=caa4ae5d7d864278ffbf5dbd9c25bb2932e91fc5;hp=a4bfa54837d7a1ae4d811d30b9180d4246878030;hpb=d375df220fae47f38944c4832bcbd5f5d568884c;p=mesa.git

diff --git a/src/mesa/drivers/dri/i965/gen6_viewport_state.c b/src/mesa/drivers/dri/i965/gen6_viewport_state.c
index a4bfa54837d..95243f08c50 100644
--- a/src/mesa/drivers/dri/i965/gen6_viewport_state.c
+++ b/src/mesa/drivers/dri/i965/gen6_viewport_state.c
@@ -29,48 +29,53 @@
 #include "brw_state.h"
 #include "brw_defines.h"
 #include "intel_batchbuffer.h"
+#include "main/fbobject.h"
 
 /* The clip VP defines the guardband region where expensive clipping is skipped
  * and fragments are allowed to be generated and clipped out cheaply by the SF.
- *
- * By setting it to NDC bounds of [-1,1], we don't do GB clipping.  It's
- * supposed to cause seams to become visible in apps due to shared edges taking
- * different clip/no clip paths depending on whether the rest of the prim ends
- * up in the guardband or not.
  */
 static void
-prepare_clip_vp(struct brw_context *brw)
+gen6_upload_clip_vp(struct brw_context *brw)
 {
+   struct gl_context *ctx = &brw->intel.ctx;
    struct brw_clipper_viewport *vp;
 
    vp = brw_state_batch(brw, AUB_TRACE_CLIP_VP_STATE,
 			sizeof(*vp), 32, &brw->clip.vp_offset);
 
-   vp->xmin = -1.0;
-   vp->xmax = 1.0;
-   vp->ymin = -1.0;
-   vp->ymax = 1.0;
+   /* According to the Sandybridge PRM, Volume 2, Part 1, Section 6.3.8
+    * "Vertex X,Y Clamping and Quantization", the screen-aligned 2D
+    * bounding-box of an object must not exceed 16K pixels in either X or Y.
+    */
+   const float maximum_post_clamp_delta = 16384;
+   float gbx = maximum_post_clamp_delta / (float) ctx->Viewport.Width;
+   float gby = maximum_post_clamp_delta / (float) ctx->Viewport.Height;
+
+   vp->xmin = -gbx;
+   vp->xmax = gbx;
+   vp->ymin = -gby;
+   vp->ymax = gby;
 
    brw->state.dirty.cache |= CACHE_NEW_CLIP_VP;
 }
 
 const struct brw_tracked_state gen6_clip_vp = {
    .dirty = {
-      .mesa = 0,
+      .mesa = _NEW_VIEWPORT,
       .brw = BRW_NEW_BATCH,
       .cache = 0,
    },
-   .prepare = prepare_clip_vp,
+   .emit = gen6_upload_clip_vp,
 };
 
 static void
-prepare_sf_vp(struct brw_context *brw)
+gen6_upload_sf_vp(struct brw_context *brw)
 {
    struct gl_context *ctx = &brw->intel.ctx;
    const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
    struct brw_sf_viewport *sfv;
    GLfloat y_scale, y_bias;
-   const GLboolean render_to_fbo = (ctx->DrawBuffer->Name != 0);
+   const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
    const GLfloat *v = ctx->Viewport._WindowMap.m;
 
    sfv = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
@@ -103,7 +108,7 @@ const struct brw_tracked_state gen6_sf_vp = {
       .brw = BRW_NEW_BATCH,
       .cache = 0,
    },
-   .prepare = prepare_sf_vp,
+   .emit = gen6_upload_sf_vp,
 };
 
 static void upload_viewport_state_pointers(struct brw_context *brw)