diff options
Diffstat (limited to 'src/intel')
| -rw-r--r-- | src/intel/isl/isl_gen7.c | 28 |
1 files changed, 5 insertions, 23 deletions
diff --git a/src/intel/isl/isl_gen7.c b/src/intel/isl/isl_gen7.c index 18687b535de..8e6b441b9b6 100644 --- a/src/intel/isl/isl_gen7.c +++ b/src/intel/isl/isl_gen7.c @@ -352,30 +352,12 @@ gen7_choose_valign_el(const struct isl_device *dev, if (isl_surf_usage_is_stencil(info->usage)) { /* The Ivybridge PRM states that the stencil buffer's vertical alignment * is 8 [Ivybridge PRM, Volume 1, Part 1, Section 6.18.4.4 Alignment - * Unit Size]. However, valign=8 is outside the set of valid values of - * RENDER_SURFACE_STATE.SurfaceVerticalAlignment, which is VALIGN_2 - * (0x0) and VALIGN_4 (0x1). - * - * The PRM is generally confused about the width, height, and alignment - * of the stencil buffer; and this confusion appears elsewhere. For - * example, the following PRM text effectively converts the stencil - * buffer's 8-pixel alignment to a 4-pixel alignment [Ivybridge PRM, - * Volume 1, Part 1, Section - * 6.18.4.2 Base Address and LOD Calculation]: - * - * For separate stencil buffer, the width must be mutiplied by 2 and - * height divided by 2 as follows: - * - * w_L = 2*i*ceil(W_L/i) - * h_L = 1/2*j*ceil(H_L/j) - * - * The root of the confusion is that, in W tiling, each pair of rows is - * interleaved into one. - * - * FINISHME(chadv): Decide to set valign=4 or valign=8 after isl's API - * is more polished. + * Unit Size]. valign=8 is outside the set of valid values of + * RENDER_SURFACE_STATE.SurfaceVerticalAlignment, but that's ok because + * a stencil buffer will never be used directly for texturing or + * rendering on gen7. */ - require_valign4 = true; + return 8; } assert(!require_valign2 || !require_valign4); |