From 8e0437914bb786d0b05be8f95e4ff37bf5a19f44 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Fri, 11 Feb 2011 13:42:52 +1000
Subject: r600g: add support for s3tc formats.

On r600, s3tc formats require a 1D tiled texture format,
so we have to do uploads using a blit, via the 64-bit and 128-bit formats

Based on the r600c code we use a 64 and 128-bit type to do the
blits.

Still requires R600_ENABLE_S3TC until the kernel fixes are in,
this has only been tested on evergreen where the kernel doesn't
yet get in the way.
---
 src/gallium/drivers/r600/r600_blit.c | 60 ++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

(limited to 'src/gallium/drivers/r600/r600_blit.c')

diff --git a/src/gallium/drivers/r600/r600_blit.c b/src/gallium/drivers/r600/r600_blit.c
index fbade99fc5..6687d09e0f 100644
--- a/src/gallium/drivers/r600/r600_blit.c
+++ b/src/gallium/drivers/r600/r600_blit.c
@@ -219,6 +219,47 @@ static void r600_hw_copy_region(struct pipe_context *ctx,
 	r600_blitter_end(ctx);
 }
 
+struct texture_orig_info {
+	unsigned format;
+	unsigned width0;
+	unsigned height0;
+};
+
+static void r600_s3tc_to_blittable(struct pipe_resource *tex,
+				   unsigned level,
+				   struct texture_orig_info *orig)
+{
+	unsigned pixsize = util_format_get_blocksize(tex->format);
+	int new_format;
+	int new_height, new_width;
+
+	orig->format = tex->format;
+	orig->width0 = tex->width0;
+	orig->height0 = tex->height0;
+
+	if (pixsize == 8)
+		new_format = PIPE_FORMAT_R16G16B16A16_UNORM; /* 64-bit block */
+	else
+		new_format = PIPE_FORMAT_R32G32B32A32_UNORM; /* 128-bit block */
+
+	new_width = util_format_get_nblocksx(tex->format, orig->width0);
+	new_height = util_format_get_nblocksy(tex->format, orig->height0);
+
+	tex->width0 = new_width;
+	tex->height0 = new_height;
+	tex->format = new_format;
+
+}
+
+static void r600_reset_blittable_to_s3tc(struct pipe_resource *tex,
+					 unsigned level,
+					 struct texture_orig_info *orig)
+{
+	tex->format = orig->format;
+	tex->width0 = orig->width0;
+	tex->height0 = orig->height0;
+}
+
 static void r600_resource_copy_region(struct pipe_context *ctx,
 				      struct pipe_resource *dst,
 				      unsigned dst_level,
@@ -228,13 +269,32 @@ static void r600_resource_copy_region(struct pipe_context *ctx,
 				      const struct pipe_box *src_box)
 {
 	struct r600_resource_texture *rsrc = (struct r600_resource_texture*)src;
+	struct texture_orig_info orig_info[2];
+	boolean restore_orig[2];
 
 	if (rsrc->depth && !rsrc->is_flushing_texture)
 		r600_texture_depth_flush(ctx, src, FALSE);
 
+	restore_orig[0] = restore_orig[1] = FALSE;
+
+	if (util_format_is_s3tc(src->format)) {
+		r600_s3tc_to_blittable(src, src_level, &orig_info[0]);
+		restore_orig[0] = TRUE;
+	}
+
+	if (util_format_is_s3tc(dst->format)) {
+		r600_s3tc_to_blittable(dst, dst_level, &orig_info[1]);
+		restore_orig[1] = TRUE;
+	}
+
 	r600_hw_copy_region(ctx, dst, dst_level, dstx, dsty, dstz,
 			    src, src_level, src_box);
 
+	if (restore_orig[0])
+		r600_reset_blittable_to_s3tc(src, src_level, &orig_info[0]);
+
+	if (restore_orig[1])
+		r600_reset_blittable_to_s3tc(dst, dst_level, &orig_info[1]);
 }
 
 void r600_init_blit_functions(struct r600_pipe_context *rctx)
-- 
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