freedreno/a3xx: add fake RGTC support (required for GL3)

Also throw in LATC while we're at it (same exact format). This could be
made more efficient by keeping a shadow compressed texture to use for
returning at map time. However... it's not worth it for now...
presumably compressed textures are not updated often.

Lastly fix up Z32S8 transfers to non-0 layers.

Signed-off-by: Ilia Mirkin <[email protected]>
Signed-off-by: Rob Clark <[email protected]>

3 files changed, 22 insertions, 1 deletions

diff --git a/src/gallium/drivers/freedreno/a3xx/fd3_format.c b/src/gallium/drivers/freedreno/a3xx/fd3_format.c
index 9b313b598a8..52ea9444517 100644
--- a/src/gallium/drivers/freedreno/a3xx/fd3_format.c
+++ b/src/gallium/drivers/freedreno/a3xx/fd3_format.c
@@ -275,6 +275,16 @@ static struct fd3_format formats[PIPE_FORMAT_COUNT] = {
 	_T(DXT3_SRGBA, DXT3, NONE, WZYX),
 	_T(DXT5_RGBA,  DXT5, NONE, WZYX),
 	_T(DXT5_SRGBA, DXT5, NONE, WZYX),
+
+	/* faked */
+	_T(RGTC1_UNORM, 8_8_8_8_UNORM, NONE, WZYX),
+	_T(RGTC1_SNORM, 8_8_8_8_SNORM, NONE, WZYX),
+	_T(RGTC2_UNORM, 8_8_8_8_UNORM, NONE, WZYX),
+	_T(RGTC2_SNORM, 8_8_8_8_SNORM, NONE, WZYX),
+	_T(LATC1_UNORM, 8_8_8_8_UNORM, NONE, WZYX),
+	_T(LATC1_SNORM, 8_8_8_8_SNORM, NONE, WZYX),
+	_T(LATC2_UNORM, 8_8_8_8_UNORM, NONE, WZYX),
+	_T(LATC2_SNORM, 8_8_8_8_SNORM, NONE, WZYX),
 };
 
 enum a3xx_vtx_fmt
@@ -314,6 +324,8 @@ fd3_pipe2fetchsize(enum pipe_format format)
 {
 	if (format == PIPE_FORMAT_Z32_FLOAT_S8X24_UINT)
 		format = PIPE_FORMAT_Z32_FLOAT;
+	else if (util_format_description(format)->layout == UTIL_FORMAT_LAYOUT_RGTC)
+		format = PIPE_FORMAT_R8G8B8A8_UNORM;
 	switch (util_format_get_blocksizebits(format) / util_format_get_blockwidth(format)) {
 	case 8: return TFETCH_1_BYTE;
 	case 16: return TFETCH_2_BYTE;
@@ -328,6 +340,14 @@ fd3_pipe2fetchsize(enum pipe_format format)
 	}
 }
 
+unsigned
+fd3_pipe2nblocksx(enum pipe_format format, unsigned width)
+{
+	if (util_format_description(format)->layout == UTIL_FORMAT_LAYOUT_RGTC)
+		format = PIPE_FORMAT_R8G8B8A8_UNORM;
+	return util_format_get_nblocksx(format, width);
+}
+
 /* we need to special case a bit the depth/stencil restore, because we are
  * using the texture sampler to blit into the depth/stencil buffer, *not*
  * into a color buffer.  Otherwise fd3_tex_swiz() will do the wrong thing,
diff --git a/src/gallium/drivers/freedreno/a3xx/fd3_format.h b/src/gallium/drivers/freedreno/a3xx/fd3_format.h
index 05c5ea3d247..48c503e9a82 100644
--- a/src/gallium/drivers/freedreno/a3xx/fd3_format.h
+++ b/src/gallium/drivers/freedreno/a3xx/fd3_format.h
@@ -37,6 +37,7 @@ enum a3xx_color_fmt fd3_pipe2color(enum pipe_format format);
 enum pipe_format fd3_gmem_restore_format(enum pipe_format format);
 enum a3xx_color_fmt fd3_fs_output_format(enum pipe_format format);
 enum a3xx_color_swap fd3_pipe2swap(enum pipe_format format);
+unsigned fd3_pipe2nblocksx(enum pipe_format format, unsigned width);
 
 uint32_t fd3_tex_swiz(enum pipe_format format, unsigned swizzle_r,
 		unsigned swizzle_g, unsigned swizzle_b, unsigned swizzle_a);
diff --git a/src/gallium/drivers/freedreno/a3xx/fd3_texture.c b/src/gallium/drivers/freedreno/a3xx/fd3_texture.c
index 2d6ecb2c050..15e63e7d478 100644
--- a/src/gallium/drivers/freedreno/a3xx/fd3_texture.c
+++ b/src/gallium/drivers/freedreno/a3xx/fd3_texture.c
@@ -240,7 +240,7 @@ fd3_sampler_view_create(struct pipe_context *pctx, struct pipe_resource *prsc,
 			A3XX_TEX_CONST_1_HEIGHT(u_minify(prsc->height0, lvl));
 	/* when emitted, A3XX_TEX_CONST_2_INDX() must be OR'd in: */
 	so->texconst2 =
-			A3XX_TEX_CONST_2_PITCH(util_format_get_nblocksx(cso->format, rsc->slices[lvl].pitch) * rsc->cpp);
+			A3XX_TEX_CONST_2_PITCH(fd3_pipe2nblocksx(cso->format, rsc->slices[lvl].pitch) * rsc->cpp);
 	switch (prsc->target) {
 	case PIPE_TEXTURE_1D_ARRAY:
 	case PIPE_TEXTURE_2D_ARRAY: