From fe2528c0b69d5719b15d926ada9424cac7569b9c Mon Sep 17 00:00:00 2001 From: Chris Forbes Date: Sun, 15 Sep 2013 22:25:45 +1200 Subject: i965: Fix cube array coordinate normalization Hardware requires the magnitude of the largest component to not exceed 1; brw_cubemap_normalize ensures that this is the case. Unfortunately, we would previously multiply the array index for cube arrays by the normalization factor. The incorrect array index would then cause the sampler to attempt to access either the wrong cube, or memory outside the cube surface entirely, resulting in garbage rendering or in the worst case, hangs. Alter the normalization pass to only multiply the .xyz components. Fixes broken rendering in the arb_texture_cube_map_array-cubemap piglit, which was recently adjusted to provoke this behavior. V2: Fix indent. Signed-off-by: Chris Forbes Cc: "9.2" mesa-stable@lists.freedesktop.org Reviewed-by: Eric Anholt --- src/mesa/drivers/dri/i965/brw_cubemap_normalize.cpp | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'src') diff --git a/src/mesa/drivers/dri/i965/brw_cubemap_normalize.cpp b/src/mesa/drivers/dri/i965/brw_cubemap_normalize.cpp index 9e149f96f53..46155fb43af 100644 --- a/src/mesa/drivers/dri/i965/brw_cubemap_normalize.cpp +++ b/src/mesa/drivers/dri/i965/brw_cubemap_normalize.cpp @@ -32,6 +32,7 @@ #include "glsl/glsl_types.h" #include "glsl/ir.h" +#include "program/prog_instruction.h" /* For WRITEMASK_* */ class brw_cubemap_normalize_visitor : public ir_hierarchical_visitor { public: @@ -88,11 +89,16 @@ brw_cubemap_normalize_visitor::visit_leave(ir_texture *ir) glsl_type::float_type, expr, NULL); - deref = new(mem_ctx) ir_dereference_variable(var); - ir->coordinate = new(mem_ctx) ir_expression(ir_binop_mul, - ir->coordinate->type, - deref, - expr); + /* coordinate.xyz *= expr */ + assign = new(mem_ctx) ir_assignment( + new(mem_ctx) ir_dereference_variable(var), + new(mem_ctx) ir_expression(ir_binop_mul, + ir->coordinate->type, + new(mem_ctx) ir_dereference_variable(var), + expr)); + assign->write_mask = WRITEMASK_XYZ; + base_ir->insert_before(assign); + ir->coordinate = new(mem_ctx) ir_dereference_variable(var); progress = true; return visit_continue; -- cgit v1.2.3