[Mesa-dev] [PATCH 08/23] i965/gen9: Set horizontal alignment for the miptree

[Anuj Phogat]

Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
---
 src/mesa/drivers/dri/i965/brw_tex_layout.c | 80 ++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_tex_layout.c b/src/mesa/drivers/dri/i965/brw_tex_layout.c
index eab3884..39fb3b1 100644
--- a/src/mesa/drivers/dri/i965/brw_tex_layout.c
+++ b/src/mesa/drivers/dri/i965/brw_tex_layout.c
@@ -40,6 +40,80 @@
 #define FILE_DEBUG_FLAG DEBUG_MIPTREE
 
 static unsigned int
+tr_mode_horizontal_texture_alignment(struct brw_context *brw,
+                                     struct intel_mipmap_tree *mt)
+{
+   const unsigned *align_yf, *align_ys;
+   /* Bits per pixel/element. */
+   const unsigned bpp = _mesa_get_format_bytes(mt->format) * 8;
+
+   /* Horizontal alignment tables for TRMODE_YF and TRMODE_YS. Value
+    * in below tables specifies the horizontal alignment requirement
+    * in elements for the surface. An element is defined as a pixel
+    * in uncompresed surface formats, and as a compression block in
+    * compressed surface formats. For MSFMT_DEPTH_STENCIL type
+    * multisampled surfaces, an element is a sample.
+    */
+   const unsigned align_1d_yf[] = {4096, 2048, 1024, 512, 256};
+   const unsigned align_1d_ys[] = {65536, 32768, 16384, 8192, 4096};
+   const unsigned align_2d_yf[] = {64, 64, 32, 32, 16};
+   const unsigned align_2d_ys[] = {256, 256, 128, 128, 64};
+   const unsigned align_3d_yf[] = {16, 8, 8, 8, 4};
+   const unsigned align_3d_ys[] = {64, 32, 32, 32, 16};
+   int i = 0;
+
+   /* Alignment computations below assume bpp >= 8 and a power of 2. */
+   assert (bpp >= 8 && bpp <= 128 && (bpp & (bpp - 1)) == 0);
+
+   switch(mt->target) {
+   case GL_TEXTURE_1D:
+   case GL_TEXTURE_1D_ARRAY:
+      align_yf = align_1d_yf;
+      align_ys = align_1d_ys;
+      break;
+   case GL_TEXTURE_2D:
+   case GL_TEXTURE_RECTANGLE:
+   case GL_TEXTURE_2D_ARRAY:
+   case GL_TEXTURE_CUBE_MAP:
+   case GL_TEXTURE_CUBE_MAP_ARRAY:
+   case GL_TEXTURE_2D_MULTISAMPLE:
+   case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
+      align_yf = align_2d_yf;
+      align_ys = align_2d_ys;
+      break;
+   case GL_TEXTURE_3D:
+      align_yf = align_3d_yf;
+      align_ys = align_3d_ys;
+      break;
+   default:
+      unreachable("not reached");
+   }
+
+   /* Compute array index. */
+   while (bpp >> (i + 4))
+      i++;
+
+   if (mt->num_samples > 1) {
+         const unsigned ms_align_div[] = {2, 2, 4, 4};
+         int j = 0;
+         /* num_samples must be power of 2. */
+         assert((mt->num_samples & (mt->num_samples -1)) == 0);
+
+         /* Compute array index. */
+         while (mt->num_samples >> (j + 2))
+            j++;
+
+         return mt->tr_mode == INTEL_MIPTREE_TRMODE_YF ?
+                align_yf[i] / ms_align_div[j] :
+                align_ys[i] / ms_align_div[j];
+   }
+
+   return (mt->tr_mode == INTEL_MIPTREE_TRMODE_YF ? align_yf[i]
+                                                  : align_ys[i]);
+}
+
+
+static unsigned int
 intel_horizontal_texture_alignment_unit(struct brw_context *brw,
                                         struct intel_mipmap_tree *mt)
 {
@@ -79,6 +153,12 @@ intel_horizontal_texture_alignment_unit(struct brw_context *brw,
    if (mt->format == MESA_FORMAT_S_UINT8)
       return 8;
 
+   if (brw->gen >= 9 && mt->tr_mode != INTEL_MIPTREE_TRMODE_NONE) {
+      uint32_t align = tr_mode_horizontal_texture_alignment(brw, mt);
+      /* XY_FAST_COPY_BLT doesn't support horizontal alignment < 32. */
+      return align < 32 ? 32 : align;
+   }
+
    if (brw->gen >= 7 && mt->format == MESA_FORMAT_Z_UNORM16)
       return 8;
 
-- 
2.3.4