v2: Use MESA_FORMAT_SARGB8 to store the decoded texture data
Signed-off-by: Anuj Phogat <anuj.pho...@gmail.com>
---
src/mesa/main/texcompress_etc.c | 96 +++++++++++++++++++++++++++++++++++---
src/mesa/main/texcompress_etc.h | 9 +++-
2 files changed, 96 insertions(+), 9 deletions(-)
diff --git a/src/mesa/main/texcompress_etc.c b/src/mesa/main/texcompress_etc.c
index c04ba8d..9940375 100644
--- a/src/mesa/main/texcompress_etc.c
+++ b/src/mesa/main/texcompress_etc.c
@@ -28,6 +28,7 @@
* GL_COMPRESSED_RGB8_ETC2
* GL_COMPRESSED_SRGB8_ETC2
* GL_COMPRESSED_RGBA8_ETC2_EAC
+ * GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
*/
#include <stdbool.h>
@@ -494,6 +495,14 @@ etc2_alpha8_fetch_texel(const struct etc2_block *block,
}
static void
+etc2_rgba8_fetch_texel(const struct etc2_block *block,
+ int x, int y, GLubyte *dst)
+{
+ etc2_rgb8_fetch_texel(block, x, y, dst);
+ etc2_alpha8_fetch_texel(block, x, y, dst);
+}
+
+static void
etc2_alpha8_parse_block(struct etc2_block *block, const GLubyte *src)
{
block->base_codeword = src[0];
@@ -517,14 +526,6 @@ etc2_rgba8_parse_block(struct etc2_block *block, const
GLubyte *src)
etc2_alpha8_parse_block(block, src);
}
-static void
-etc2_rgba8_fetch_texel(const struct etc2_block *block,
- int x, int y, GLubyte *dst)
-{
- etc2_rgb8_fetch_texel(block, x, y, dst);
- etc2_alpha8_fetch_texel(block, x, y, dst);
-}
-
/**
* Convert an 8-bit sRGB value from non-linear space to a
* linear RGB value in [0, 1].
@@ -662,6 +663,50 @@ etc2_unpack_rgba8(uint8_t *dst_row,
}
}
+static void
+etc2_unpack_srgb8_alpha8(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned width,
+ unsigned height)
+{
+ /* If internalformat is COMPRESSED_SRGB8_ALPHA8_ETC2_EAC, each 4 × 4 block
+ * of RGBA8888 information is compressed to 128 bits. To decode a block, the
+ two 64-bit integers int64bitAlpha and int64bitColor are calculated.
+ */
+ const unsigned bw = 4, bh = 4, bs = 16, comps = 4;
+ struct etc2_block block;
+ unsigned x, y, i, j;
+ uint8_t tmp;
+
+ for (y = 0; y < height; y += bh) {
+ const uint8_t *src = src_row;
+
+ for (x = 0; x < width; x+= bw) {
+ etc2_rgba8_parse_block(&block, src);
+
+ for (j = 0; j < bh; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
+ for (i = 0; i < bw; i++) {
+ etc2_rgba8_fetch_texel(&block, i, j, dst);
+
+ /* Convert to MESA_FORMAT_SARGB8 */
+ tmp = dst[0];
+ dst[0] = dst[2];
+ dst[2] = tmp;
+ dst[3] = dst[3];
+
+ dst += comps;
+ }
+ }
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
/* ETC2 texture formats are valid in glCompressedTexImage2D and
* glCompressedTexSubImage2D functions */
GLboolean
@@ -688,6 +733,14 @@ _mesa_texstore_etc2_rgba8_eac(TEXSTORE_PARAMS)
return GL_FALSE;
}
+GLboolean
+_mesa_texstore_etc2_srgb8_alpha8_eac(TEXSTORE_PARAMS)
+{
+ ASSERT(0);
+
+ return GL_FALSE;
+}
+
void
_mesa_fetch_texel_2d_f_etc2_rgb8(const struct swrast_texture_image *texImage,
GLint i, GLint j, GLint k, GLfloat *texel)
@@ -748,11 +801,34 @@ _mesa_fetch_texel_2d_f_etc2_rgba8_eac(const struct
swrast_texture_image *texImag
texel[ACOMP] = UBYTE_TO_FLOAT(dst[3]);
}
+void
+_mesa_fetch_texel_2d_f_etc2_srgb8_alpha8_eac(const struct
+ swrast_texture_image *texImage,
+ GLint i, GLint j,
+ GLint k, GLfloat *texel)
+{
+ struct etc2_block block;
+ GLubyte dst[4];
+ const GLubyte *src;
+
+ src = (const GLubyte *) texImage->Map +
+ (((texImage->RowStride + 3) / 4) * (j / 4) + (i / 4)) * 16;
+
+ etc2_rgba8_parse_block(&block, src);
+ etc2_rgba8_fetch_texel(&block, i % 4, j % 4, dst);
+
+ texel[RCOMP] = nonlinear_to_linear(dst[0]);
+ texel[GCOMP] = nonlinear_to_linear(dst[1]);
+ texel[BCOMP] = nonlinear_to_linear(dst[2]);
+ texel[ACOMP] = UBYTE_TO_FLOAT(dst[3]);
+}
+
/**
* Decode texture data in any one of following formats:
* `MESA_FORMAT_ETC2_RGB8`
* `MESA_FORMAT_ETC2_SRGB8`
* `MESA_FORMAT_ETC2_RGBA8_EAC`
+ * `MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC`
*
* The size of the source data must be a multiple of the ETC2 block size
* even if the texture image's dimensions are not aligned to 4.
@@ -783,4 +859,8 @@ _mesa_unpack_etc2_format(uint8_t *dst_row,
etc2_unpack_rgba8(dst_row, dst_stride,
src_row, src_stride,
src_width, src_height);
+ else if (format == MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC)
+ etc2_unpack_srgb8_alpha8(dst_row, dst_stride,
+ src_row, src_stride,
+ src_width, src_height);
}
diff --git a/src/mesa/main/texcompress_etc.h b/src/mesa/main/texcompress_etc.h
index 2191c97..c10414d 100644
--- a/src/mesa/main/texcompress_etc.h
+++ b/src/mesa/main/texcompress_etc.h
@@ -43,6 +43,9 @@ _mesa_texstore_etc2_srgb8(TEXSTORE_PARAMS);
GLboolean
_mesa_texstore_etc2_rgba8_eac(TEXSTORE_PARAMS);
+GLboolean
+_mesa_texstore_etc2_srgb8_alpha8_eac(TEXSTORE_PARAMS);
+
void
_mesa_fetch_texel_2d_f_etc1_rgb8(const struct swrast_texture_image *texImage,
GLint i, GLint j, GLint k, GLfloat *texel);
@@ -55,7 +58,11 @@ _mesa_fetch_texel_2d_f_etc2_srgb8(const struct
swrast_texture_image *texImage,
void
_mesa_fetch_texel_2d_f_etc2_rgba8_eac(const struct swrast_texture_image
*texImage,
GLint i, GLint j, GLint k, GLfloat
*texel);
-
+void
+_mesa_fetch_texel_2d_f_etc2_srgb8_alpha8_eac(const struct
+ swrast_texture_image *texImage,
+ GLint i, GLint j,
+ GLint k, GLfloat *texel);
void
_mesa_etc1_unpack_rgba8888(uint8_t *dst_row,
unsigned dst_stride,
--
1.7.7.6
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