i965: Fix repeated usage of rectangle texture coordinate scaling.

Previously, we set up new entries in the params[] array on every access
of a rectangle texture.  Unfortunately, we only reserve space for
(2 * MaxTextureImageUnits) extra entries, so programs which accessed
rectangle textures more times than that would write off the end of the
array and likely crash.

We don't really have a decent mapping between the index returned by
_mesa_add_state_reference and our index into the params array, so we
have to manually search for it.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78691
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Cc: mesa-stable@lists.freedesktop.org
(cherry picked from commit bb9623a1a8b1884817422752c8dced9f084d4547)

1 files changed, 20 insertions, 7 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index bece45f25c4..02511b6f6fe 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -1483,15 +1483,28 @@ fs_visitor::rescale_texcoord(ir_texture *ir, fs_reg coordinate,
 	 return coordinate;
       }
 
-      scale_x = fs_reg(UNIFORM, uniforms);
-      scale_y = fs_reg(UNIFORM, uniforms + 1);
-
       GLuint index = _mesa_add_state_reference(params,
 					       (gl_state_index *)tokens);
-      stage_prog_data->param[uniforms++] =
-         &prog->Parameters->ParameterValues[index][0].f;
-      stage_prog_data->param[uniforms++] =
-         &prog->Parameters->ParameterValues[index][1].f;
+      /* Try to find existing copies of the texrect scale uniforms. */
+      for (unsigned i = 0; i < uniforms; i++) {
+         if (stage_prog_data->param[i] ==
+             &prog->Parameters->ParameterValues[index][0].f) {
+            scale_x = fs_reg(UNIFORM, i);
+            scale_y = fs_reg(UNIFORM, i + 1);
+            break;
+         }
+      }
+
+      /* If we didn't already set them up, do so now. */
+      if (scale_x.file == BAD_FILE) {
+         scale_x = fs_reg(UNIFORM, uniforms);
+         scale_y = fs_reg(UNIFORM, uniforms + 1);
+
+         stage_prog_data->param[uniforms++] =
+            &prog->Parameters->ParameterValues[index][0].f;
+         stage_prog_data->param[uniforms++] =
+            &prog->Parameters->ParameterValues[index][1].f;
+      }
    }
 
    /* The 965 requires the EU to do the normalization of GL rectangle