/**
* \file texcompress_etc.c
* GL_OES_compressed_ETC1_RGB8_texture support.
+ * Supported ETC2 texture formats are:
+ * GL_COMPRESSED_RGB8_ETC2
+ * GL_COMPRESSED_SRGB8_ETC2
+ * GL_COMPRESSED_RGBA8_ETC2_EAC
+ * GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
+ * GL_COMPRESSED_R11_EAC
+ * GL_COMPRESSED_RG11_EAC
+ * GL_COMPRESSED_SIGNED_R11_EAC
+ * GL_COMPRESSED_SIGNED_RG11_EAC
+ * MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1
+ * MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1
*/
-
-#include "mfeatures.h"
+#include <stdbool.h>
#include "texcompress.h"
#include "texcompress_etc.h"
#include "texstore.h"
+#include "config.h"
#include "macros.h"
-#include "swrast/s_context.h"
+#include "format_unpack.h"
+#include "util/format_srgb.h"
-GLboolean
-_mesa_texstore_etc1_rgb8(TEXSTORE_PARAMS)
-{
- /* GL_ETC1_RGB8_OES is only valid in glCompressedTexImage2D */
- ASSERT(0);
- return GL_FALSE;
-}
+struct etc2_block {
+ int distance;
+ uint64_t pixel_indices[2];
+ const int *modifier_tables[2];
+ bool flipped;
+ bool opaque;
+ bool is_ind_mode;
+ bool is_diff_mode;
+ bool is_t_mode;
+ bool is_h_mode;
+ bool is_planar_mode;
+ uint8_t base_colors[3][3];
+ uint8_t paint_colors[4][3];
+ uint8_t base_codeword;
+ uint8_t multiplier;
+ uint8_t table_index;
+};
+
+static const int etc2_distance_table[8] = {
+ 3, 6, 11, 16, 23, 32, 41, 64 };
+
+static const int etc2_modifier_tables[16][8] = {
+ { -3, -6, -9, -15, 2, 5, 8, 14},
+ { -3, -7, -10, -13, 2, 6, 9, 12},
+ { -2, -5, -8, -13, 1, 4, 7, 12},
+ { -2, -4, -6, -13, 1, 3, 5, 12},
+ { -3, -6, -8, -12, 2, 5, 7, 11},
+ { -3, -7, -9, -11, 2, 6, 8, 10},
+ { -4, -7, -8, -11, 3, 6, 7, 10},
+ { -3, -5, -8, -11, 2, 4, 7, 10},
+ { -2, -6, -8, -10, 1, 5, 7, 9},
+ { -2, -5, -8, -10, 1, 4, 7, 9},
+ { -2, -4, -8, -10, 1, 3, 7, 9},
+ { -2, -5, -7, -10, 1, 4, 6, 9},
+ { -3, -4, -7, -10, 2, 3, 6, 9},
+ { -1, -2, -3, -10, 0, 1, 2, 9},
+ { -4, -6, -8, -9, 3, 5, 7, 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
#undef TAG
#undef UINT8_TYPE
-void
-_mesa_fetch_texel_2d_f_etc1_rgb8(const struct swrast_texture_image *texImage,
- GLint i, GLint j, GLint k, GLfloat *texel)
+GLboolean
+_mesa_texstore_etc1_rgb8(UNUSED_TEXSTORE_PARAMS)
{
- struct etc1_block block;
- GLubyte dst[3];
- const GLubyte *src;
-
- src = (const GLubyte *) texImage->Map +
- (((texImage->RowStride + 3) / 4) * (j / 4) + (i / 4)) * 8;
-
- etc1_parse_block(&block, src);
- etc1_fetch_texel(&block, i % 4, j % 4, dst);
+ /* GL_ETC1_RGB8_OES is only valid in glCompressedTexImage2D */
+ assert(0);
- texel[RCOMP] = UBYTE_TO_FLOAT(dst[0]);
- texel[GCOMP] = UBYTE_TO_FLOAT(dst[1]);
- texel[BCOMP] = UBYTE_TO_FLOAT(dst[2]);
- texel[ACOMP] = 1.0f;
+ return GL_FALSE;
}
+
/**
* Decode texture data in format `MESA_FORMAT_ETC1_RGB8` to
* `MESA_FORMAT_ABGR8888`.
src_row, src_stride,
src_width, src_height);
}
+
+static uint8_t
+etc2_base_color1_t_mode(const uint8_t *in, GLuint index)
+{
+ uint8_t R1a = 0, x = 0;
+ /* base col 1 = extend_4to8bits( (R1a << 2) | R1b, G1, B1) */
+ switch(index) {
+ case 0:
+ R1a = (in[0] >> 3) & 0x3;
+ x = ((R1a << 2) | (in[0] & 0x3));
+ break;
+ case 1:
+ x = ((in[1] >> 4) & 0xf);
+ break;
+ case 2:
+ x = (in[1] & 0xf);
+ break;
+ default:
+ /* invalid index */
+ break;
+ }
+ return ((x << 4) | (x & 0xf));
+}
+
+static uint8_t
+etc2_base_color2_t_mode(const uint8_t *in, GLuint index)
+{
+ uint8_t x = 0;
+ /*extend 4to8bits(R2, G2, B2)*/
+ switch(index) {
+ case 0:
+ x = ((in[2] >> 4) & 0xf );
+ break;
+ case 1:
+ x = (in[2] & 0xf);
+ break;
+ case 2:
+ x = ((in[3] >> 4) & 0xf);
+ break;
+ default:
+ /* invalid index */
+ break;
+ }
+ return ((x << 4) | (x & 0xf));
+}
+
+static uint8_t
+etc2_base_color1_h_mode(const uint8_t *in, GLuint index)
+{
+ uint8_t x = 0;
+ /* base col 1 = extend 4to8bits(R1, (G1a << 1) | G1b, (B1a << 3) | B1b) */
+ switch(index) {
+ case 0:
+ x = ((in[0] >> 3) & 0xf);
+ break;
+ case 1:
+ x = (((in[0] & 0x7) << 1) | ((in[1] >> 4) & 0x1));
+ break;
+ case 2:
+ x = ((in[1] & 0x8) |
+ (((in[1] & 0x3) << 1) | ((in[2] >> 7) & 0x1)));
+ break;
+ default:
+ /* invalid index */
+ break;
+ }
+ return ((x << 4) | (x & 0xf));
+}
+
+static uint8_t
+etc2_base_color2_h_mode(const uint8_t *in, GLuint index)
+{
+ uint8_t x = 0;
+ /* base col 2 = extend 4to8bits(R2, G2, B2) */
+ switch(index) {
+ case 0:
+ x = ((in[2] >> 3) & 0xf );
+ break;
+ case 1:
+ x = (((in[2] & 0x7) << 1) | ((in[3] >> 7) & 0x1));
+ break;
+ case 2:
+ x = ((in[3] >> 3) & 0xf);
+ break;
+ default:
+ /* invalid index */
+ break;
+ }
+ return ((x << 4) | (x & 0xf));
+}
+
+static uint8_t
+etc2_base_color_o_planar(const uint8_t *in, GLuint index)
+{
+ GLuint tmp;
+ switch(index) {
+ case 0:
+ tmp = ((in[0] >> 1) & 0x3f); /* RO */
+ return ((tmp << 2) | (tmp >> 4));
+ case 1:
+ tmp = (((in[0] & 0x1) << 6) | /* GO1 */
+ ((in[1] >> 1) & 0x3f)); /* GO2 */
+ return ((tmp << 1) | (tmp >> 6));
+ case 2:
+ tmp = (((in[1] & 0x1) << 5) | /* BO1 */
+ (in[2] & 0x18) | /* BO2 */
+ (((in[2] & 0x3) << 1) | ((in[3] >> 7) & 0x1))); /* BO3 */
+ return ((tmp << 2) | (tmp >> 4));
+ default:
+ /* invalid index */
+ return 0;
+ }
+}
+
+static uint8_t
+etc2_base_color_h_planar(const uint8_t *in, GLuint index)
+{
+ GLuint tmp;
+ switch(index) {
+ case 0:
+ tmp = (((in[3] & 0x7c) >> 1) | /* RH1 */
+ (in[3] & 0x1)); /* RH2 */
+ return ((tmp << 2) | (tmp >> 4));
+ case 1:
+ tmp = (in[4] >> 1) & 0x7f; /* GH */
+ return ((tmp << 1) | (tmp >> 6));
+ case 2:
+ tmp = (((in[4] & 0x1) << 5) |
+ ((in[5] >> 3) & 0x1f)); /* BH */
+ return ((tmp << 2) | (tmp >> 4));
+ default:
+ /* invalid index */
+ return 0;
+ }
+}
+
+static uint8_t
+etc2_base_color_v_planar(const uint8_t *in, GLuint index)
+{
+ GLuint tmp;
+ switch(index) {
+ case 0:
+ tmp = (((in[5] & 0x7) << 0x3) |
+ ((in[6] >> 5) & 0x7)); /* RV */
+ return ((tmp << 2) | (tmp >> 4));
+ case 1:
+ tmp = (((in[6] & 0x1f) << 2) |
+ ((in[7] >> 6) & 0x3)); /* GV */
+ return ((tmp << 1) | (tmp >> 6));
+ case 2:
+ tmp = in[7] & 0x3f; /* BV */
+ return ((tmp << 2) | (tmp >> 4));
+ default:
+ /* invalid index */
+ return 0;
+ }
+}
+
+static GLint
+etc2_get_pixel_index(const struct etc2_block *block, int x, int y)
+{
+ int bit = ((3 - y) + (3 - x) * 4) * 3;
+ int idx = (block->pixel_indices[1] >> bit) & 0x7;
+ return idx;
+}
+
+static uint8_t
+etc2_clamp(int color)
+{
+ /* CLAMP(color, 0, 255) */
+ return (uint8_t) CLAMP(color, 0, 255);
+}
+
+static GLushort
+etc2_clamp2(int color)
+{
+ /* CLAMP(color, 0, 2047) */
+ return (GLushort) CLAMP(color, 0, 2047);
+}
+
+static GLshort
+etc2_clamp3(int color)
+{
+ /* CLAMP(color, -1023, 1023) */
+ return (GLshort) CLAMP(color, -1023, 1023);
+}
+
+static void
+etc2_rgb8_parse_block(struct etc2_block *block,
+ const uint8_t *src,
+ GLboolean punchthrough_alpha)
+{
+ unsigned i;
+ 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];
+ const int G_plus_dG = (src[1] >> 3) + lookup[src[1] & 0x7];
+ const int B_plus_dB = (src[2] >> 3) + lookup[src[2] & 0x7];
+
+ /* Reset the mode flags */
+ block->is_ind_mode = false;
+ block->is_diff_mode = false;
+ block->is_t_mode = false;
+ block->is_h_mode = false;
+ block->is_planar_mode = false;
+
+ if (punchthrough_alpha)
+ block->opaque = src[3] & 0x2;
+ else
+ diffbit = src[3] & 0x2;
+
+ if (!diffbit && !punchthrough_alpha) {
+ /* individual mode */
+ block->is_ind_mode = true;
+
+ for (i = 0; i < 3; i++) {
+ /* Texture decode algorithm is same for individual mode in etc1
+ * & etc2.
+ */
+ block->base_colors[0][i] = etc1_base_color_ind_hi(src[i]);
+ block->base_colors[1][i] = etc1_base_color_ind_lo(src[i]);
+ }
+ }
+ else if (R_plus_dR < 0 || R_plus_dR > 31){
+ /* T mode */
+ block->is_t_mode = true;
+
+ for(i = 0; i < 3; i++) {
+ block->base_colors[0][i] = etc2_base_color1_t_mode(src, i);
+ block->base_colors[1][i] = etc2_base_color2_t_mode(src, i);
+ }
+ /* pick distance */
+ block->distance =
+ etc2_distance_table[(((src[3] >> 2) & 0x3) << 1) |
+ (src[3] & 0x1)];
+
+ for (i = 0; i < 3; i++) {
+ block->paint_colors[0][i] = etc2_clamp(block->base_colors[0][i]);
+ block->paint_colors[1][i] = etc2_clamp(block->base_colors[1][i] +
+ block->distance);
+ block->paint_colors[2][i] = etc2_clamp(block->base_colors[1][i]);
+ block->paint_colors[3][i] = etc2_clamp(block->base_colors[1][i] -
+ block->distance);
+ }
+ }
+ else if (G_plus_dG < 0 || G_plus_dG > 31){
+ int base_color_1_value, base_color_2_value;
+
+ /* H mode */
+ block->is_h_mode = true;
+
+ for(i = 0; i < 3; i++) {
+ block->base_colors[0][i] = etc2_base_color1_h_mode(src, i);
+ block->base_colors[1][i] = etc2_base_color2_h_mode(src, i);
+ }
+
+ base_color_1_value = (block->base_colors[0][0] << 16) +
+ (block->base_colors[0][1] << 8) +
+ block->base_colors[0][2];
+ base_color_2_value = (block->base_colors[1][0] << 16) +
+ (block->base_colors[1][1] << 8) +
+ block->base_colors[1][2];
+ /* pick distance */
+ block->distance =
+ etc2_distance_table[(src[3] & 0x4) |
+ ((src[3] & 0x1) << 1) |
+ (base_color_1_value >= base_color_2_value)];
+
+ for (i = 0; i < 3; i++) {
+ block->paint_colors[0][i] = etc2_clamp(block->base_colors[0][i] +
+ block->distance);
+ block->paint_colors[1][i] = etc2_clamp(block->base_colors[0][i] -
+ block->distance);
+ block->paint_colors[2][i] = etc2_clamp(block->base_colors[1][i] +
+ block->distance);
+ block->paint_colors[3][i] = etc2_clamp(block->base_colors[1][i] -
+ block->distance);
+ }
+ }
+ 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 */
+ block->opaque = true;
+
+ 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 || punchthrough_alpha) {
+ /* differential mode */
+ block->is_diff_mode = true;
+
+ for (i = 0; i < 3; i++) {
+ /* Texture decode algorithm is same for differential mode in etc1
+ * & etc2.
+ */
+ block->base_colors[0][i] = etc1_base_color_diff_hi(src[i]);
+ block->base_colors[1][i] = etc1_base_color_diff_lo(src[i]);
+ }
+ }
+
+ if (block->is_ind_mode || block->is_diff_mode) {
+ 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] = (!punchthrough_alpha || block->opaque) ?
+ etc1_modifier_tables[table1_idx] :
+ etc2_modifier_tables_non_opaque[table1_idx];
+ block->modifier_tables[1] = (!punchthrough_alpha || block->opaque) ?
+ etc1_modifier_tables[table2_idx] :
+ etc2_modifier_tables_non_opaque[table2_idx];
+
+ block->flipped = (src[3] & 0x1);
+ }
+
+ block->pixel_indices[0] =
+ (src[4] << 24) | (src[5] << 16) | (src[6] << 8) | src[7];
+}
+
+static void
+etc2_rgb8_fetch_texel(const struct etc2_block *block,
+ int x, int y, uint8_t *dst,
+ GLboolean punchthrough_alpha)
+{
+ const uint8_t *base_color;
+ int modifier, bit, idx, blk;
+
+ /* get pixel index */
+ bit = y + x * 4;
+ idx = ((block->pixel_indices[0] >> (15 + bit)) & 0x2) |
+ ((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 && 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];
+ modifier = block->modifier_tables[blk][idx];
+
+ dst[0] = etc2_clamp(base_color[0] + modifier);
+ dst[1] = etc2_clamp(base_color[1] + modifier);
+ 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 && 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];
+ dst[2] = block->paint_colors[idx][2];
+ }
+ else if (block->is_planar_mode) {
+ /* {R(x, y) = clamp255((x × (RH − RO) + y × (RV − RO) + 4 × RO + 2) >> 2)
+ * {G(x, y) = clamp255((x × (GH − GO) + y × (GV − GO) + 4 × GO + 2) >> 2)
+ * {B(x, y) = clamp255((x × (BH − BO) + y × (BV − BO) + 4 × BO + 2) >> 2)
+ */
+ int red, green, blue;
+ red = (x * (block->base_colors[1][0] - block->base_colors[0][0]) +
+ y * (block->base_colors[2][0] - block->base_colors[0][0]) +
+ 4 * block->base_colors[0][0] + 2) >> 2;
+
+ green = (x * (block->base_colors[1][1] - block->base_colors[0][1]) +
+ y * (block->base_colors[2][1] - block->base_colors[0][1]) +
+ 4 * block->base_colors[0][1] + 2) >> 2;
+
+ blue = (x * (block->base_colors[1][2] - block->base_colors[0][2]) +
+ y * (block->base_colors[2][2] - block->base_colors[0][2]) +
+ 4 * block->base_colors[0][2] + 2) >> 2;
+
+ 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;
+ }
+ else
+ unreachable("unhandled block mode");
+}
+
+static void
+etc2_alpha8_fetch_texel(const struct etc2_block *block,
+ int x, int y, uint8_t *dst)
+{
+ int modifier, alpha, idx;
+ /* get pixel index */
+ idx = etc2_get_pixel_index(block, x, y);
+ modifier = etc2_modifier_tables[block->table_index][idx];
+ alpha = block->base_codeword + modifier * block->multiplier;
+ dst[3] = etc2_clamp(alpha);
+}
+
+static void
+etc2_r11_fetch_texel(const struct etc2_block *block,
+ int x, int y, uint8_t *dst)
+{
+ GLint modifier, idx;
+ GLshort color;
+ /* Get pixel index */
+ idx = etc2_get_pixel_index(block, x, y);
+ modifier = etc2_modifier_tables[block->table_index][idx];
+
+ if (block->multiplier != 0)
+ /* clamp2(base codeword × 8 + 4 + modifier × multiplier × 8) */
+ color = etc2_clamp2(((block->base_codeword << 3) | 0x4) +
+ ((modifier * block->multiplier) << 3));
+ else
+ color = etc2_clamp2(((block->base_codeword << 3) | 0x4) + modifier);
+
+ /* Extend 11 bits color value to 16 bits. OpenGL ES 3.0 specification
+ * allows extending the color value to any number of bits. But, an
+ * implementation is not allowed to truncate the 11-bit value to less than
+ * 11 bits."
+ */
+ color = (color << 5) | (color >> 6);
+ ((GLushort *)dst)[0] = color;
+}
+
+static void
+etc2_signed_r11_fetch_texel(const struct etc2_block *block,
+ int x, int y, uint8_t *dst)
+{
+ GLint modifier, idx;
+ GLshort color;
+ GLbyte base_codeword = (GLbyte) block->base_codeword;
+
+ if (base_codeword == -128)
+ base_codeword = -127;
+
+ /* Get pixel index */
+ idx = etc2_get_pixel_index(block, x, y);
+ modifier = etc2_modifier_tables[block->table_index][idx];
+
+ if (block->multiplier != 0)
+ /* clamp3(base codeword × 8 + modifier × multiplier × 8) */
+ color = etc2_clamp3((base_codeword << 3) +
+ ((modifier * block->multiplier) << 3));
+ else
+ color = etc2_clamp3((base_codeword << 3) + modifier);
+
+ /* Extend 11 bits color value to 16 bits. OpenGL ES 3.0 specification
+ * allows extending the color value to any number of bits. But, an
+ * implementation is not allowed to truncate the 11-bit value to less than
+ * 11 bits. A negative 11-bit value must first be made positive before bit
+ * replication, and then made negative again
+ */
+ if (color >= 0)
+ color = (color << 5) | (color >> 5);
+ else {
+ color = -color;
+ color = (color << 5) | (color >> 5);
+ color = -color;
+ }
+ ((GLshort *)dst)[0] = color;
+}
+
+static void
+etc2_alpha8_parse_block(struct etc2_block *block, const uint8_t *src)
+{
+ block->base_codeword = src[0];
+ block->multiplier = (src[1] >> 4) & 0xf;
+ block->table_index = src[1] & 0xf;
+ block->pixel_indices[1] = (((uint64_t)src[2] << 40) |
+ ((uint64_t)src[3] << 32) |
+ ((uint64_t)src[4] << 24) |
+ ((uint64_t)src[5] << 16) |
+ ((uint64_t)src[6] << 8) |
+ ((uint64_t)src[7]));
+}
+
+static void
+etc2_r11_parse_block(struct etc2_block *block, const uint8_t *src)
+{
+ /* Parsing logic remains same as for etc2_alpha8_parse_block */
+ etc2_alpha8_parse_block(block, src);
+}
+
+static void
+etc2_rgba8_parse_block(struct etc2_block *block, const uint8_t *src)
+{
+ /* RGB component is parsed the same way as for MESA_FORMAT_ETC2_RGB8 */
+ etc2_rgb8_parse_block(block, src + 8,
+ false /* punchthrough_alpha */);
+ /* Parse Alpha component */
+ etc2_alpha8_parse_block(block, src);
+}
+
+static void
+etc2_rgba8_fetch_texel(const struct etc2_block *block,
+ int x, int y, uint8_t *dst)
+{
+ etc2_rgb8_fetch_texel(block, x, y, dst,
+ false /* punchthrough_alpha */);
+ etc2_alpha8_fetch_texel(block, x, y, dst);
+}
+
+static void
+etc2_unpack_rgb8(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;
+ /*
+ * Destination texture may not be a multiple of four texels in
+ * height. Compute a safe height to avoid writing outside the texture.
+ */
+ const unsigned h = MIN2(bh, height - y);
+
+ for (x = 0; x < width; x+= bw) {
+ /*
+ * Destination texture may not be a multiple of four texels in
+ * width. Compute a safe width to avoid writing outside the texture.
+ */
+ const unsigned w = MIN2(bw, width - x);
+
+ etc2_rgb8_parse_block(&block, src,
+ false /* punchthrough_alpha */);
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
+ for (i = 0; i < w; i++) {
+ etc2_rgb8_fetch_texel(&block, i, j, dst,
+ false /* punchthrough_alpha */);
+ dst[3] = 255;
+ dst += comps;
+ }
+ }
+
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+static void
+etc2_unpack_srgb8(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned width,
+ unsigned height,
+ bool bgra)
+{
+ const unsigned bw = 4, bh = 4, bs = 8, 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;
+ const unsigned h = MIN2(bh, height - y);
+
+ for (x = 0; x < width; x+= bw) {
+ const unsigned w = MIN2(bw, width - x);
+ etc2_rgb8_parse_block(&block, src,
+ false /* punchthrough_alpha */);
+
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
+ for (i = 0; i < w; i++) {
+ etc2_rgb8_fetch_texel(&block, i, j, dst,
+ false /* punchthrough_alpha */);
+
+ if (bgra) {
+ /* Convert to MESA_FORMAT_B8G8R8A8_SRGB */
+ tmp = dst[0];
+ dst[0] = dst[2];
+ dst[2] = tmp;
+ dst[3] = 255;
+ }
+
+ dst += comps;
+ }
+ }
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+static void
+etc2_unpack_rgba8(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned width,
+ unsigned height)
+{
+ /* If internalformat is COMPRESSED_RGBA8_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;
+
+ for (y = 0; y < height; y += bh) {
+ const uint8_t *src = src_row;
+ const unsigned h = MIN2(bh, height - y);
+
+ for (x = 0; x < width; x+= bw) {
+ const unsigned w = MIN2(bw, width - x);
+ etc2_rgba8_parse_block(&block, src);
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
+ for (i = 0; i < w; i++) {
+ etc2_rgba8_fetch_texel(&block, i, j, dst);
+ dst += comps;
+ }
+ }
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+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,
+ bool bgra)
+{
+ /* 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 unsigned h = MIN2(bh, height - y);
+ const uint8_t *src = src_row;
+
+ for (x = 0; x < width; x+= bw) {
+ const unsigned w = MIN2(bw, width - x);
+ etc2_rgba8_parse_block(&block, src);
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
+ for (i = 0; i < w; i++) {
+ etc2_rgba8_fetch_texel(&block, i, j, dst);
+
+ if (bgra) {
+ /* Convert to MESA_FORMAT_B8G8R8A8_SRGB */
+ tmp = dst[0];
+ dst[0] = dst[2];
+ dst[2] = tmp;
+ dst[3] = dst[3];
+ }
+
+ dst += comps;
+ }
+ }
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+static void
+etc2_unpack_r11(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned width,
+ unsigned height)
+{
+ /* If internalformat is COMPRESSED_R11_EAC, each 4 × 4 block of
+ color information is compressed to 64 bits.
+ */
+ const unsigned bw = 4, bh = 4, bs = 8, comps = 1, comp_size = 2;
+ struct etc2_block block;
+ unsigned x, y, i, j;
+
+ for (y = 0; y < height; y += bh) {
+ const unsigned h = MIN2(bh, height - y);
+ const uint8_t *src = src_row;
+
+ for (x = 0; x < width; x+= bw) {
+ const unsigned w = MIN2(bw, width - x);
+ etc2_r11_parse_block(&block, src);
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps * comp_size;
+ for (i = 0; i < w; i++) {
+ etc2_r11_fetch_texel(&block, i, j, dst);
+ dst += comps * comp_size;
+ }
+ }
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+static void
+etc2_unpack_rg11(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned width,
+ unsigned height)
+{
+ /* If internalformat is COMPRESSED_RG11_EAC, each 4 × 4 block of
+ RG color information is compressed to 128 bits.
+ */
+ const unsigned bw = 4, bh = 4, bs = 16, comps = 2, comp_size = 2;
+ struct etc2_block block;
+ unsigned x, y, i, j;
+
+ for (y = 0; y < height; y += bh) {
+ const unsigned h = MIN2(bh, height - y);
+ const uint8_t *src = src_row;
+
+ for (x = 0; x < width; x+= bw) {
+ const unsigned w = MIN2(bw, width - x);
+ /* red component */
+ etc2_r11_parse_block(&block, src);
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride +
+ x * comps * comp_size;
+ for (i = 0; i < w; i++) {
+ etc2_r11_fetch_texel(&block, i, j, dst);
+ dst += comps * comp_size;
+ }
+ }
+ /* green component */
+ etc2_r11_parse_block(&block, src + 8);
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride +
+ x * comps * comp_size;
+ for (i = 0; i < w; i++) {
+ etc2_r11_fetch_texel(&block, i, j, dst + comp_size);
+ dst += comps * comp_size;
+ }
+ }
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+static void
+etc2_unpack_signed_r11(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned width,
+ unsigned height)
+{
+ /* If internalformat is COMPRESSED_SIGNED_R11_EAC, each 4 × 4 block of
+ red color information is compressed to 64 bits.
+ */
+ const unsigned bw = 4, bh = 4, bs = 8, comps = 1, comp_size = 2;
+ struct etc2_block block;
+ unsigned x, y, i, j;
+
+ for (y = 0; y < height; y += bh) {
+ const unsigned h = MIN2(bh, height - y);
+ const uint8_t *src = src_row;
+
+ for (x = 0; x < width; x+= bw) {
+ const unsigned w = MIN2(bw, width - x);
+ etc2_r11_parse_block(&block, src);
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride +
+ x * comps * comp_size;
+ for (i = 0; i < w; i++) {
+ etc2_signed_r11_fetch_texel(&block, i, j, dst);
+ dst += comps * comp_size;
+ }
+ }
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+static void
+etc2_unpack_signed_rg11(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned width,
+ unsigned height)
+{
+ /* If internalformat is COMPRESSED_SIGNED_RG11_EAC, each 4 × 4 block of
+ RG color information is compressed to 128 bits.
+ */
+ const unsigned bw = 4, bh = 4, bs = 16, comps = 2, comp_size = 2;
+ struct etc2_block block;
+ unsigned x, y, i, j;
+
+ for (y = 0; y < height; y += bh) {
+ const unsigned h = MIN2(bh, height - y);
+ const uint8_t *src = src_row;
+
+ for (x = 0; x < width; x+= bw) {
+ const unsigned w = MIN2(bw, width - x);
+ /* red component */
+ etc2_r11_parse_block(&block, src);
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride +
+ x * comps * comp_size;
+ for (i = 0; i < w; i++) {
+ etc2_signed_r11_fetch_texel(&block, i, j, dst);
+ dst += comps * comp_size;
+ }
+ }
+ /* green component */
+ etc2_r11_parse_block(&block, src + 8);
+
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride +
+ x * comps * comp_size;
+ for (i = 0; i < w; i++) {
+ etc2_signed_r11_fetch_texel(&block, i, j, dst + comp_size);
+ dst += comps * comp_size;
+ }
+ }
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+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 unsigned h = MIN2(bh, height - y);
+ const uint8_t *src = src_row;
+
+ for (x = 0; x < width; x+= bw) {
+ const unsigned w = MIN2(bw, width - x);
+ etc2_rgb8_parse_block(&block, src,
+ true /* punchthrough_alpha */);
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
+ for (i = 0; i < w; i++) {
+ etc2_rgb8_fetch_texel(&block, i, j, dst,
+ true /* punchthrough_alpha */);
+ dst += comps;
+ }
+ }
+
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+static void
+etc2_unpack_srgb8_punchthrough_alpha1(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned width,
+ unsigned height,
+ bool bgra)
+{
+ const unsigned bw = 4, bh = 4, bs = 8, comps = 4;
+ struct etc2_block block;
+ unsigned x, y, i, j;
+ uint8_t tmp;
+
+ for (y = 0; y < height; y += bh) {
+ const unsigned h = MIN2(bh, height - y);
+ const uint8_t *src = src_row;
+
+ for (x = 0; x < width; x+= bw) {
+ const unsigned w = MIN2(bw, width - x);
+ etc2_rgb8_parse_block(&block, src,
+ true /* punchthrough_alpha */);
+ for (j = 0; j < h; j++) {
+ uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps;
+ for (i = 0; i < w; i++) {
+ etc2_rgb8_fetch_texel(&block, i, j, dst,
+ true /* punchthrough_alpha */);
+
+ if (bgra) {
+ /* Convert to MESA_FORMAT_B8G8R8A8_SRGB */
+ 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
+_mesa_texstore_etc2_rgb8(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+GLboolean
+_mesa_texstore_etc2_srgb8(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+GLboolean
+_mesa_texstore_etc2_rgba8_eac(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+GLboolean
+_mesa_texstore_etc2_srgb8_alpha8_eac(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+GLboolean
+_mesa_texstore_etc2_r11_eac(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+GLboolean
+_mesa_texstore_etc2_signed_r11_eac(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+GLboolean
+_mesa_texstore_etc2_rg11_eac(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+GLboolean
+_mesa_texstore_etc2_signed_rg11_eac(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+GLboolean
+_mesa_texstore_etc2_rgb8_punchthrough_alpha1(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+GLboolean
+_mesa_texstore_etc2_srgb8_punchthrough_alpha1(UNUSED_TEXSTORE_PARAMS)
+{
+ assert(0);
+
+ return GL_FALSE;
+}
+
+
+/**
+ * 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`
+ * `MESA_FORMAT_ETC2_R11_EAC`
+ * `MESA_FORMAT_ETC2_RG11_EAC`
+ * `MESA_FORMAT_ETC2_SIGNED_R11_EAC`
+ * `MESA_FORMAT_ETC2_SIGNED_RG11_EAC`
+ * `MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1`
+ * `MESA_FORMAT_ETC2_SRGB8_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.
+ *
+ * \param src_width in pixels
+ * \param src_height in pixels
+ * \param dst_stride in bytes
+ */
+
+void
+_mesa_unpack_etc2_format(uint8_t *dst_row,
+ unsigned dst_stride,
+ const uint8_t *src_row,
+ unsigned src_stride,
+ unsigned src_width,
+ unsigned src_height,
+ mesa_format format,
+ bool bgra)
+{
+ if (format == MESA_FORMAT_ETC2_RGB8)
+ etc2_unpack_rgb8(dst_row, dst_stride,
+ src_row, src_stride,
+ src_width, src_height);
+ else if (format == MESA_FORMAT_ETC2_SRGB8)
+ etc2_unpack_srgb8(dst_row, dst_stride,
+ src_row, src_stride,
+ src_width, src_height, bgra);
+ else if (format == MESA_FORMAT_ETC2_RGBA8_EAC)
+ 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, bgra);
+ else if (format == MESA_FORMAT_ETC2_R11_EAC)
+ etc2_unpack_r11(dst_row, dst_stride,
+ src_row, src_stride,
+ src_width, src_height);
+ else if (format == MESA_FORMAT_ETC2_RG11_EAC)
+ etc2_unpack_rg11(dst_row, dst_stride,
+ src_row, src_stride,
+ src_width, src_height);
+ else if (format == MESA_FORMAT_ETC2_SIGNED_R11_EAC)
+ etc2_unpack_signed_r11(dst_row, dst_stride,
+ src_row, src_stride,
+ src_width, src_height);
+ else if (format == MESA_FORMAT_ETC2_SIGNED_RG11_EAC)
+ 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);
+ else if (format == MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1)
+ etc2_unpack_srgb8_punchthrough_alpha1(dst_row, dst_stride,
+ src_row, src_stride,
+ src_width, src_height, bgra);
+}
+
+
+
+static void
+fetch_etc1_rgb8(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j,
+ GLfloat *texel)
+{
+ struct etc1_block block;
+ GLubyte dst[3];
+ const GLubyte *src;
+
+ src = map + (((rowStride + 3) / 4) * (j / 4) + (i / 4)) * 8;
+
+ etc1_parse_block(&block, src);
+ etc1_fetch_texel(&block, i % 4, j % 4, dst);
+
+ texel[RCOMP] = UBYTE_TO_FLOAT(dst[0]);
+ texel[GCOMP] = UBYTE_TO_FLOAT(dst[1]);
+ texel[BCOMP] = UBYTE_TO_FLOAT(dst[2]);
+ texel[ACOMP] = 1.0f;
+}
+
+
+static void
+fetch_etc2_rgb8(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j, GLfloat *texel)
+{
+ struct etc2_block block;
+ uint8_t dst[3];
+ const uint8_t *src;
+
+ src = map + (((rowStride + 3) / 4) * (j / 4) + (i / 4)) * 8;
+
+ 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]);
+ texel[BCOMP] = UBYTE_TO_FLOAT(dst[2]);
+ texel[ACOMP] = 1.0f;
+}
+
+static void
+fetch_etc2_srgb8(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j, GLfloat *texel)
+{
+ struct etc2_block block;
+ uint8_t dst[3];
+ const uint8_t *src;
+
+ src = map + (((rowStride + 3) / 4) * (j / 4) + (i / 4)) * 8;
+
+ etc2_rgb8_parse_block(&block, src,
+ false /* punchthrough_alpha */);
+ etc2_rgb8_fetch_texel(&block, i % 4, j % 4, dst,
+ false /* punchthrough_alpha */);
+
+ texel[RCOMP] = util_format_srgb_8unorm_to_linear_float(dst[0]);
+ texel[GCOMP] = util_format_srgb_8unorm_to_linear_float(dst[1]);
+ texel[BCOMP] = util_format_srgb_8unorm_to_linear_float(dst[2]);
+ texel[ACOMP] = 1.0f;
+}
+
+static void
+fetch_etc2_rgba8_eac(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j, GLfloat *texel)
+{
+ struct etc2_block block;
+ uint8_t dst[4];
+ const uint8_t *src;
+
+ src = map + (((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] = 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]);
+}
+
+static void
+fetch_etc2_srgb8_alpha8_eac(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j, GLfloat *texel)
+{
+ struct etc2_block block;
+ uint8_t dst[4];
+ const uint8_t *src;
+
+ src = map + (((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] = util_format_srgb_8unorm_to_linear_float(dst[0]);
+ texel[GCOMP] = util_format_srgb_8unorm_to_linear_float(dst[1]);
+ texel[BCOMP] = util_format_srgb_8unorm_to_linear_float(dst[2]);
+ texel[ACOMP] = UBYTE_TO_FLOAT(dst[3]);
+}
+
+static void
+fetch_etc2_r11_eac(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j, GLfloat *texel)
+{
+ struct etc2_block block;
+ GLushort dst;
+ const uint8_t *src;
+
+ src = map + (((rowStride + 3) / 4) * (j / 4) + (i / 4)) * 8;
+
+ etc2_r11_parse_block(&block, src);
+ etc2_r11_fetch_texel(&block, i % 4, j % 4, (uint8_t *)&dst);
+
+ texel[RCOMP] = USHORT_TO_FLOAT(dst);
+ texel[GCOMP] = 0.0f;
+ texel[BCOMP] = 0.0f;
+ texel[ACOMP] = 1.0f;
+}
+
+static void
+fetch_etc2_rg11_eac(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j, GLfloat *texel)
+{
+ struct etc2_block block;
+ GLushort dst[2];
+ const uint8_t *src;
+
+ src = map + (((rowStride + 3) / 4) * (j / 4) + (i / 4)) * 16;
+
+ /* red component */
+ etc2_r11_parse_block(&block, src);
+ etc2_r11_fetch_texel(&block, i % 4, j % 4, (uint8_t *)dst);
+
+ /* green component */
+ etc2_r11_parse_block(&block, src + 8);
+ etc2_r11_fetch_texel(&block, i % 4, j % 4, (uint8_t *)(dst + 1));
+
+ texel[RCOMP] = USHORT_TO_FLOAT(dst[0]);
+ texel[GCOMP] = USHORT_TO_FLOAT(dst[1]);
+ texel[BCOMP] = 0.0f;
+ texel[ACOMP] = 1.0f;
+}
+
+static void
+fetch_etc2_signed_r11_eac(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j, GLfloat *texel)
+{
+ struct etc2_block block;
+ GLushort dst;
+ const uint8_t *src;
+
+ src = map + (((rowStride + 3) / 4) * (j / 4) + (i / 4)) * 8;
+
+ etc2_r11_parse_block(&block, src);
+ etc2_signed_r11_fetch_texel(&block, i % 4, j % 4, (uint8_t *)&dst);
+
+ texel[RCOMP] = SHORT_TO_FLOAT(dst);
+ texel[GCOMP] = 0.0f;
+ texel[BCOMP] = 0.0f;
+ texel[ACOMP] = 1.0f;
+}
+
+static void
+fetch_etc2_signed_rg11_eac(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j, GLfloat *texel)
+{
+ struct etc2_block block;
+ GLushort dst[2];
+ const uint8_t *src;
+
+ src = map + (((rowStride + 3) / 4) * (j / 4) + (i / 4)) * 16;
+
+ /* red component */
+ etc2_r11_parse_block(&block, src);
+ etc2_signed_r11_fetch_texel(&block, i % 4, j % 4, (uint8_t *)dst);
+
+ /* green component */
+ etc2_r11_parse_block(&block, src + 8);
+ etc2_signed_r11_fetch_texel(&block, i % 4, j % 4, (uint8_t *)(dst + 1));
+
+ texel[RCOMP] = SHORT_TO_FLOAT(dst[0]);
+ texel[GCOMP] = SHORT_TO_FLOAT(dst[1]);
+ texel[BCOMP] = 0.0f;
+ texel[ACOMP] = 1.0f;
+}
+
+static void
+fetch_etc2_rgb8_punchthrough_alpha1(const GLubyte *map,
+ GLint rowStride, GLint i, GLint j,
+ GLfloat *texel)
+{
+ struct etc2_block block;
+ uint8_t dst[4];
+ const uint8_t *src;
+
+ src = map + (((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]);
+}
+
+static void
+fetch_etc2_srgb8_punchthrough_alpha1(const GLubyte *map,
+ GLint rowStride,
+ GLint i, GLint j, GLfloat *texel)
+{
+ struct etc2_block block;
+ uint8_t dst[4];
+ const uint8_t *src;
+
+ src = map + (((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] = util_format_srgb_8unorm_to_linear_float(dst[0]);
+ texel[GCOMP] = util_format_srgb_8unorm_to_linear_float(dst[1]);
+ texel[BCOMP] = util_format_srgb_8unorm_to_linear_float(dst[2]);
+ texel[ACOMP] = UBYTE_TO_FLOAT(dst[3]);
+}
+
+
+compressed_fetch_func
+_mesa_get_etc_fetch_func(mesa_format format)
+{
+ switch (format) {
+ case MESA_FORMAT_ETC1_RGB8:
+ return fetch_etc1_rgb8;
+ case MESA_FORMAT_ETC2_RGB8:
+ return fetch_etc2_rgb8;
+ case MESA_FORMAT_ETC2_SRGB8:
+ return fetch_etc2_srgb8;
+ case MESA_FORMAT_ETC2_RGBA8_EAC:
+ return fetch_etc2_rgba8_eac;
+ case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
+ return fetch_etc2_srgb8_alpha8_eac;
+ case MESA_FORMAT_ETC2_R11_EAC:
+ return fetch_etc2_r11_eac;
+ case MESA_FORMAT_ETC2_RG11_EAC:
+ return fetch_etc2_rg11_eac;
+ case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
+ return fetch_etc2_signed_r11_eac;
+ case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
+ return fetch_etc2_signed_rg11_eac;
+ case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
+ return fetch_etc2_rgb8_punchthrough_alpha1;
+ case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
+ return fetch_etc2_srgb8_punchthrough_alpha1;
+ default:
+ return NULL;
+ }
+}
projects / mesa.git / blobdiff