[Mesa-dev] [PATCH 18/22] mesa: Add decoding functions for GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
Anuj Phogat
anuj.phogat at gmail.com
Fri Nov 9 23:30:05 PST 2012
Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
---
src/mesa/main/texcompress_etc.c | 178 ++++++++++++++++++++++++++++++++++-----
src/mesa/main/texcompress_etc.h | 8 ++
2 files changed, 165 insertions(+), 21 deletions(-)
diff --git a/src/mesa/main/texcompress_etc.c b/src/mesa/main/texcompress_etc.c
index a225018..4c0be7d 100644
--- a/src/mesa/main/texcompress_etc.c
+++ b/src/mesa/main/texcompress_etc.c
@@ -46,6 +46,7 @@
struct etc2_block {
int flipped;
+ int opaque;
int distance;
uint64_t pixel_indices[2];
const int *modifier_tables[2];
@@ -83,6 +84,17 @@ static const int etc2_modifier_tables[16][8] = {
{ -3, -5, -7, -9, 2, 4, 6, 8},
};
+static const int etc2_modifier_tables_non_opaque[8][4] = {
+ { 0, 8, 0, -8},
+ { 0, 17, 0, -17},
+ { 0, 29, 0, -29},
+ { 0, 42, 0, -42},
+ { 0, 60, 0, -60},
+ { 0, 80, 0, -80},
+ { 0, 106, 0, -106},
+ { 0, 183, 0, -183}
+};
+
/* define etc1_parse_block and etc. */
#define UINT8_TYPE GLubyte
#define TAG(x) x
@@ -338,10 +350,12 @@ etc2_clamp3(int color)
}
static void
-etc2_rgb8_parse_block(struct etc2_block *block, const GLubyte *src)
+etc2_rgb8_parse_block(struct etc2_block *block,
+ const GLubyte *src,
+ GLboolean punchthrough_alpha)
{
unsigned i;
- GLboolean diffbit = src[3] & 0x2;
+ GLboolean diffbit = false;
static const int lookup[8] = { 0, 1, 2, 3, -4, -3, -2, -1 };
const int R_plus_dR = (src[0] >> 3) + lookup[src[0] & 0x7];
@@ -355,7 +369,12 @@ etc2_rgb8_parse_block(struct etc2_block *block, const GLubyte *src)
block->is_h_mode = false;
block->is_planar_mode = false;
- if (!diffbit) {
+ if (punchthrough_alpha)
+ block->opaque = src[3] & 0x2;
+ else
+ diffbit = src[3] & 0x2;
+
+ if (!diffbit && !punchthrough_alpha) {
/* individual mode */
block->is_ind_mode = true;
@@ -422,17 +441,21 @@ etc2_rgb8_parse_block(struct etc2_block *block, const GLubyte *src)
block->distance);
}
}
- else if (B_plus_dB < 0 || B_plus_dB > 31){
+ else if (B_plus_dB < 0 || B_plus_dB > 31) {
/* Planar mode */
block->is_planar_mode = true;
+ /* opaque bit must be set in planar mode */
+ if (block->opaque == 0)
+ block->opaque = 1;
+
for (i = 0; i < 3; i++) {
block->base_colors[0][i] = etc2_base_color_o_planar(src, i);
block->base_colors[1][i] = etc2_base_color_h_planar(src, i);
block->base_colors[2][i] = etc2_base_color_v_planar(src, i);
}
}
- else if (diffbit) {
+ else if (diffbit || punchthrough_alpha) {
/* differential mode */
block->is_diff_mode = true;
@@ -446,9 +469,19 @@ etc2_rgb8_parse_block(struct etc2_block *block, const GLubyte *src)
}
if(block->is_ind_mode || block->is_diff_mode) {
- /* pick modifier tables. same for etc1 & etc2 textures */
- block->modifier_tables[0] = etc1_modifier_tables[(src[3] >> 5) & 0x7];
- block->modifier_tables[1] = etc1_modifier_tables[(src[3] >> 2) & 0x7];
+ int table1_idx = (src[3] >> 5) & 0x7;
+ int table2_idx = (src[3] >> 2) & 0x7;
+
+ /* Use same modifier tables as for etc1 textures if opaque bit is set
+ * or if non punchthrough texture format
+ */
+ block->modifier_tables[0] = (block->opaque || !punchthrough_alpha) ?
+ etc1_modifier_tables[table1_idx] :
+ etc2_modifier_tables_non_opaque[table1_idx];
+ block->modifier_tables[1] = (block->opaque || !punchthrough_alpha) ?
+ etc1_modifier_tables[table2_idx] :
+ etc2_modifier_tables_non_opaque[table2_idx];
+
block->flipped = (src[3] & 0x1);
}
@@ -458,7 +491,8 @@ etc2_rgb8_parse_block(struct etc2_block *block, const GLubyte *src)
static void
etc2_rgb8_fetch_texel(const struct etc2_block *block,
- int x, int y, GLubyte *dst)
+ int x, int y, GLubyte *dst,
+ GLboolean punchthrough_alpha)
{
const GLubyte *base_color;
int modifier, bit, idx, blk;
@@ -469,6 +503,16 @@ etc2_rgb8_fetch_texel(const struct etc2_block *block,
((block->pixel_indices[0] >> (bit)) & 0x1);
if (block->is_ind_mode || block->is_diff_mode) {
+ /* check for punchthrough_alpha format */
+ if (punchthrough_alpha) {
+ if (block->opaque == 0 && idx == 2) {
+ dst[0] = dst[1] = dst[2] = dst[3] = 0;
+ return;
+ }
+ else
+ dst[3] = 255;
+ }
+
/* Use pixel index and subblock to get the modifier */
blk = (block->flipped) ? (y >= 2) : (x >= 2);
base_color = block->base_colors[blk];
@@ -479,6 +523,16 @@ etc2_rgb8_fetch_texel(const struct etc2_block *block,
dst[2] = etc2_clamp(base_color[2] + modifier);
}
else if (block->is_t_mode || block->is_h_mode) {
+ /* check for punchthrough_alpha format */
+ if (punchthrough_alpha) {
+ if (block->opaque == 0 && idx == 2) {
+ dst[0] = dst[1] = dst[2] = dst[3] = 0;
+ return;
+ }
+ else
+ dst[3] = 255;
+ }
+
/* Use pixel index to pick one of the paint colors */
dst[0] = block->paint_colors[idx][0];
dst[1] = block->paint_colors[idx][1];
@@ -505,7 +559,11 @@ etc2_rgb8_fetch_texel(const struct etc2_block *block,
dst[0] = etc2_clamp(red);
dst[1] = etc2_clamp(green);
dst[2] = etc2_clamp(blue);
- }
+
+ /* check for punchthrough_alpha format */
+ if (punchthrough_alpha)
+ dst[3] = 255;
+ }
}
static void
@@ -524,7 +582,8 @@ 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_rgb8_fetch_texel(block, x, y, dst,
+ false /* punchthrough_alpha */);
etc2_alpha8_fetch_texel(block, x, y, dst);
}
@@ -608,8 +667,8 @@ static void
etc2_rgba8_parse_block(struct etc2_block *block, const GLubyte *src)
{
/* RGB component is parsed the same way as for MESA_FORMAT_ETC2_RGB8 */
- etc2_rgb8_parse_block(block, src + 8);
-
+ etc2_rgb8_parse_block(block, src + 8,
+ false /* punchthrough_alpha */);
/* Parse Alpha component */
etc2_alpha8_parse_block(block, src);
}
@@ -664,12 +723,14 @@ etc2_unpack_rgb8(uint8_t *dst_row,
const uint8_t *src = src_row;
for (x = 0; x < width; x+= bw) {
- etc2_rgb8_parse_block(&block, src);
+ etc2_rgb8_parse_block(&block, src,
+ false /* punchthrough_alpha */);
for (j = 0; j < bh; j++) {
uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
for (i = 0; i < bw; i++) {
- etc2_rgb8_fetch_texel(&block, i, j, dst);
+ etc2_rgb8_fetch_texel(&block, i, j, dst,
+ false /* punchthrough_alpha */);
dst[3] = 255;
dst += comps;
}
@@ -699,7 +760,8 @@ etc2_unpack_srgb8(uint8_t *dst_row,
const uint8_t *src = src_row;
for (x = 0; x < width; x+= bw) {
- etc2_rgb8_parse_block(&block, src);
+ etc2_rgb8_parse_block(&block, src,
+ false /* punchthrough_alpha */);
for (j = 0; j < bh; j++) {
uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
@@ -710,7 +772,7 @@ etc2_unpack_srgb8(uint8_t *dst_row,
tmp = dst[0];
dst[0] = dst[2];
dst[2] = tmp;
- dst[3] = 255;
+ dst[3] = 255;
dst += comps;
}
@@ -969,6 +1031,40 @@ etc2_unpack_signed_rg11(uint8_t *dst_row,
}
}
+static void
+etc2_unpack_rgb8_punchthrough_alpha1(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned width,
+ unsigned height)
+{
+ const unsigned bw = 4, bh = 4, bs = 8, comps = 4;
+ struct etc2_block block;
+ unsigned x, y, i, j;
+
+ for (y = 0; y < height; y += bh) {
+ const uint8_t *src = src_row;
+
+ for (x = 0; x < width; x+= bw) {
+ etc2_rgb8_parse_block(&block, src,
+ true /* punchthrough_alpha */);
+ for (j = 0; j < bh; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
+ for (i = 0; i < bw; i++) {
+ etc2_rgb8_fetch_texel(&block, i, j, dst,
+ true /* punchthrough_alpha */);
+ dst += comps;
+ }
+ }
+
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
/* ETC2 texture formats are valid in glCompressedTexImage2D and
* glCompressedTexSubImage2D functions */
GLboolean
@@ -1035,6 +1131,14 @@ _mesa_texstore_etc2_signed_rg11_eac(TEXSTORE_PARAMS)
return GL_FALSE;
}
+GLboolean
+_mesa_texstore_etc2_rgb8_punchthrough_alpha1(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)
@@ -1046,8 +1150,10 @@ _mesa_fetch_texel_2d_f_etc2_rgb8(const struct swrast_texture_image *texImage,
src = (const GLubyte *) texImage->Map +
(((texImage->RowStride + 3) / 4) * (j / 4) + (i / 4)) * 8;
- etc2_rgb8_parse_block(&block, src);
- etc2_rgb8_fetch_texel(&block, i % 4, j % 4, dst);
+ etc2_rgb8_parse_block(&block, src,
+ false /* punchthrough_alpha */);
+ etc2_rgb8_fetch_texel(&block, i % 4, j % 4, dst,
+ false /* punchthrough_alpha */);
texel[RCOMP] = UBYTE_TO_FLOAT(dst[0]);
texel[GCOMP] = UBYTE_TO_FLOAT(dst[1]);
@@ -1066,8 +1172,10 @@ _mesa_fetch_texel_2d_f_etc2_srgb8(const struct swrast_texture_image *texImage,
src = (const GLubyte *) texImage->Map +
(((texImage->RowStride + 3) / 4) * (j / 4) + (i / 4)) * 8;
- etc2_rgb8_parse_block(&block, src);
- etc2_rgb8_fetch_texel(&block, i % 4, j % 4, dst);
+ etc2_rgb8_parse_block(&block, src,
+ false /* punchthrough_alpha */);
+ etc2_rgb8_fetch_texel(&block, i % 4, j % 4, dst,
+ false /* punchthrough_alpha */);
texel[RCOMP] = nonlinear_to_linear(dst[0]);
texel[GCOMP] = nonlinear_to_linear(dst[1]);
@@ -1209,6 +1317,29 @@ _mesa_fetch_texel_2d_f_etc2_signed_rg11_eac(const struct swrast_texture_image *t
texel[ACOMP] = 1.0f;
}
+void
+_mesa_fetch_texel_2d_f_etc2_rgb8_punchthrough_alpha1(
+ 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)) * 8;
+
+ etc2_rgb8_parse_block(&block, src,
+ true /* punchthrough alpha */);
+ etc2_rgb8_fetch_texel(&block, i % 4, j % 4, dst,
+ true /* punchthrough alpha */);
+ texel[RCOMP] = UBYTE_TO_FLOAT(dst[0]);
+ texel[GCOMP] = UBYTE_TO_FLOAT(dst[1]);
+ texel[BCOMP] = UBYTE_TO_FLOAT(dst[2]);
+ texel[ACOMP] = UBYTE_TO_FLOAT(dst[3]);
+}
+
/**
* Decode texture data in any one of following formats:
* `MESA_FORMAT_ETC2_RGB8`
@@ -1219,6 +1350,7 @@ _mesa_fetch_texel_2d_f_etc2_signed_rg11_eac(const struct swrast_texture_image *t
* `MESA_FORMAT_ETC2_RG11_EAC`
* `MESA_FORMAT_ETC2_SIGNED_R11_EAC`
* `MESA_FORMAT_ETC2_SIGNED_RG11_EAC`
+ * `MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1`
*
* 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.
@@ -1269,4 +1401,8 @@ _mesa_unpack_etc2_format(uint8_t *dst_row,
etc2_unpack_signed_rg11(dst_row, dst_stride,
src_row, src_stride,
src_width, src_height);
+ else if (format == MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1)
+ etc2_unpack_rgb8_punchthrough_alpha1(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 d12a145..b9e4d85 100644
--- a/src/mesa/main/texcompress_etc.h
+++ b/src/mesa/main/texcompress_etc.h
@@ -58,6 +58,9 @@ _mesa_texstore_etc2_signed_r11_eac(TEXSTORE_PARAMS);
GLboolean
_mesa_texstore_etc2_signed_rg11_eac(TEXSTORE_PARAMS);
+GLboolean
+_mesa_texstore_etc2_rgb8_punchthrough_alpha1(TEXSTORE_PARAMS);
+
void
_mesa_fetch_texel_2d_f_etc1_rgb8(const struct swrast_texture_image *texImage,
GLint i, GLint j, GLint k, GLfloat *texel);
@@ -92,6 +95,11 @@ _mesa_fetch_texel_2d_f_etc2_signed_rg11_eac(const struct
GLint i, GLint j,
GLint k, GLfloat *texel);
void
+_mesa_fetch_texel_2d_f_etc2_rgb8_punchthrough_alpha1(
+ 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,
const uint8_t *src_row,
--
1.7.7.6
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