[Mesa-dev] [PATCH 9/9] gallium/radeon: support PIPE_CAP_SURFACE_REINTERPRET_BLOCKS

[Nicolai Hähnle]

From: Nicolai Hähnle <nicolai.haehnle at amd.com>

This is already used internally in the transfer_map implementation for
compressed textures, so the only real change here is the adjusted surface
size computation.
---
 src/gallium/drivers/r600/r600_pipe.c      |  2 +-
 src/gallium/drivers/radeon/r600_texture.c | 26 +++++++++++++++++++++++---
 src/gallium/drivers/radeonsi/si_pipe.c    |  2 +-
 3 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index 17140bb..f519916 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -279,6 +279,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TGSI_TXQS:
 	case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
 	case PIPE_CAP_INVALIDATE_BUFFER:
+	case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
 		return 1;
 
 	case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
@@ -360,7 +361,6 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 	case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
 	case PIPE_CAP_GENERATE_MIPMAP:
-	case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
 		return 0;
 
 	case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
diff --git a/src/gallium/drivers/radeon/r600_texture.c b/src/gallium/drivers/radeon/r600_texture.c
index 7c4717d..aec7e32 100644
--- a/src/gallium/drivers/radeon/r600_texture.c
+++ b/src/gallium/drivers/radeon/r600_texture.c
@@ -1212,10 +1212,30 @@ static struct pipe_surface *r600_create_surface(struct pipe_context *pipe,
 						const struct pipe_surface *templ)
 {
 	unsigned level = templ->u.tex.level;
+	unsigned width = u_minify(tex->width0, level);
+	unsigned height = u_minify(tex->height0, level);
+
+	if (templ->format != tex->format) {
+		const struct util_format_description *tex_desc
+			= util_format_description(tex->format);
+		const struct util_format_description *templ_desc
+			= util_format_description(templ->format);
+
+		assert(tex_desc->block.bits == templ_desc->block.bits);
+
+		/* Adjust size of surface if and only if the block width or
+		 * height is changed. */
+		if (tex_desc->block.width != templ_desc->block.width ||
+		    tex_desc->block.height != templ_desc->block.height) {
+			unsigned nblks_x = util_format_get_nblocksx(tex->format, width);
+			unsigned nblks_y = util_format_get_nblocksy(tex->format, height);
+
+			width = nblks_x * templ_desc->block.width;
+			height = nblks_y * templ_desc->block.height;
+		}
+	}
 
-	return r600_create_surface_custom(pipe, tex, templ,
-					  u_minify(tex->width0, level),
-					  u_minify(tex->height0, level));
+	return r600_create_surface_custom(pipe, tex, templ, width, height);
 }
 
 static void r600_surface_destroy(struct pipe_context *pipe,
diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 04e9d60..c50c707 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -304,6 +304,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
 	case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 	case PIPE_CAP_INVALIDATE_BUFFER:
+	case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
 		return 1;
 
 	case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
@@ -352,7 +353,6 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
 	case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
 	case PIPE_CAP_GENERATE_MIPMAP:
-	case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
 		return 0;
 
 	case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
-- 
2.5.0