From 80157466cd56bfaeadbdcac497b04c16c2732a3b Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Tue, 6 Jan 2015 13:35:21 -0800
Subject: [PATCH] vc4: Add miptree/texture state support for ETC1 compressed
 textures.

The format isn't flagged as enabled at runtime yet, because we need kernel
validation support.
---
 src/gallium/drivers/vc4/kernel/vc4_validate.c |  7 +++++++
 src/gallium/drivers/vc4/vc4_formats.c         |  2 ++
 src/gallium/drivers/vc4/vc4_resource.c        | 19 +++++++++++++++++++
 src/gallium/drivers/vc4/vc4_screen.c          |  3 ++-
 src/gallium/drivers/vc4/vc4_state.c           |  3 +++
 5 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/vc4/kernel/vc4_validate.c b/src/gallium/drivers/vc4/kernel/vc4_validate.c
index 4ef01108b79..a9dce1fa379 100644
--- a/src/gallium/drivers/vc4/kernel/vc4_validate.c
+++ b/src/gallium/drivers/vc4/kernel/vc4_validate.c
@@ -640,6 +640,13 @@ reloc_tex(struct vc4_exec_info *exec,
 		cpp = 1;
 		break;
 	case VC4_TEXTURE_TYPE_ETC1:
+		/* ETC1 is arranged as 64-bit blocks, where each block is 4x4
+		 * pixels.
+		 */
+		cpp = 8;
+		width = (width + 3) >> 2;
+		height = (height + 3) >> 2;
+		break;
 	case VC4_TEXTURE_TYPE_BW1:
 	case VC4_TEXTURE_TYPE_A4:
 	case VC4_TEXTURE_TYPE_A1:
diff --git a/src/gallium/drivers/vc4/vc4_formats.c b/src/gallium/drivers/vc4/vc4_formats.c
index dd700cdec7d..42cdad115b2 100644
--- a/src/gallium/drivers/vc4/vc4_formats.c
+++ b/src/gallium/drivers/vc4/vc4_formats.c
@@ -83,6 +83,8 @@ static const struct vc4_format vc4_format_table[] = {
 
         FORMAT(B5G6R5_UNORM, RGB565, RGB565, SWIZ(X, Y, Z, 1)),
 
+        FORMAT(ETC1_RGB8, NO, ETC1, SWIZ(X, Y, Z, 1)),
+
         /* Depth sampling will be handled by doing nearest filtering and not
          * unpacking the RGBA value.
          */
diff --git a/src/gallium/drivers/vc4/vc4_resource.c b/src/gallium/drivers/vc4/vc4_resource.c
index 704cd71ea4b..e4784ff86e2 100644
--- a/src/gallium/drivers/vc4/vc4_resource.c
+++ b/src/gallium/drivers/vc4/vc4_resource.c
@@ -283,6 +283,20 @@ vc4_resource_transfer_map(struct pipe_context *pctx,
                 if (usage & PIPE_TRANSFER_MAP_DIRECTLY)
                         return NULL;
 
+                if (format == PIPE_FORMAT_ETC1_RGB8) {
+                        /* ETC1 is arranged as 64-bit blocks, where each block
+                         * is 4x4 pixels.  Texture tiling operates on the
+                         * 64-bit block the way it would an uncompressed
+                         * pixels.
+                         */
+                        assert(!(ptrans->box.x & 3));
+                        assert(!(ptrans->box.y & 3));
+                        ptrans->box.x >>= 2;
+                        ptrans->box.y >>= 2;
+                        ptrans->box.width = (ptrans->box.width + 3) >> 2;
+                        ptrans->box.height = (ptrans->box.height + 3) >> 2;
+                }
+
                 /* We need to align the box to utile boundaries, since that's
                  * what load/store operates on.  This may cause us to need to
                  * read out the original contents in that border area.  Right
@@ -387,6 +401,11 @@ vc4_setup_slices(struct vc4_resource *rsc)
         struct pipe_resource *prsc = &rsc->base.b;
         uint32_t width = prsc->width0;
         uint32_t height = prsc->height0;
+        if (prsc->format == PIPE_FORMAT_ETC1_RGB8) {
+                width = (width + 3) >> 2;
+                height = (height + 3) >> 2;
+        }
+
         uint32_t pot_width = util_next_power_of_two(width);
         uint32_t pot_height = util_next_power_of_two(height);
         uint32_t offset = 0;
diff --git a/src/gallium/drivers/vc4/vc4_screen.c b/src/gallium/drivers/vc4/vc4_screen.c
index 0f9ba541aab..9aa80cab873 100644
--- a/src/gallium/drivers/vc4/vc4_screen.c
+++ b/src/gallium/drivers/vc4/vc4_screen.c
@@ -486,7 +486,8 @@ vc4_screen_is_format_supported(struct pipe_screen *pscreen,
         }
 
         if ((usage & PIPE_BIND_SAMPLER_VIEW) &&
-            vc4_tex_format_supported(format)) {
+            vc4_tex_format_supported(format) &&
+            format != PIPE_FORMAT_ETC1_RGB8) {
                 retval |= PIPE_BIND_SAMPLER_VIEW;
         }
 
diff --git a/src/gallium/drivers/vc4/vc4_state.c b/src/gallium/drivers/vc4/vc4_state.c
index 12471589510..5403c34af96 100644
--- a/src/gallium/drivers/vc4/vc4_state.c
+++ b/src/gallium/drivers/vc4/vc4_state.c
@@ -615,6 +615,9 @@ vc4_create_sampler_view(struct pipe_context *pctx, struct pipe_resource *prsc,
                  VC4_SET_FIELD(prsc->height0 & 2047, VC4_TEX_P1_HEIGHT) |
                  VC4_SET_FIELD(prsc->width0 & 2047, VC4_TEX_P1_WIDTH));
 
+        if (prsc->format == PIPE_FORMAT_ETC1_RGB8)
+                so->texture_p1 |= VC4_TEX_P1_ETCFLIP_MASK;
+
         return &so->base;
 }
 
-- 
2.30.2