/**
* \file texcompress_etc.c
* GL_OES_compressed_ETC1_RGB8_texture support.
+ * Supported ETC2 texture formats are:
+ * GL_COMPRESSED_RGB8_ETC2
*/
-
+#include <stdbool.h>
#include "mfeatures.h"
#include "texcompress.h"
#include "texcompress_etc.h"
#include "macros.h"
#include "swrast/s_context.h"
-GLboolean
-_mesa_texstore_etc1_rgb8(TEXSTORE_PARAMS)
-{
- /* GL_ETC1_RGB8_OES is only valid in glCompressedTexImage2D */
- ASSERT(0);
+struct etc2_block {
+ int distance;
+ uint32_t pixel_indices;
+ const int *modifier_tables[2];
+ bool flipped;
+ 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];
+};
- return GL_FALSE;
-}
+static const int etc2_distance_table[8] = {
+ 3, 6, 11, 16, 23, 32, 41, 64 };
/* define etc1_parse_block and etc. */
#define UINT8_TYPE GLubyte
#undef TAG
#undef UINT8_TYPE
+GLboolean
+_mesa_texstore_etc1_rgb8(TEXSTORE_PARAMS)
+{
+ /* GL_ETC1_RGB8_OES is only valid in glCompressedTexImage2D */
+ ASSERT(0);
+
+ return GL_FALSE;
+}
+
void
_mesa_fetch_texel_2d_f_etc1_rgb8(const struct swrast_texture_image *texImage,
GLint i, GLint j, GLint k, GLfloat *texel)
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 uint8_t
+etc2_clamp(int color)
+{
+ /* CLAMP(color, 0, 255) */
+ return (uint8_t) CLAMP(color, 0, 255);
+}
+
+static void
+etc2_rgb8_parse_block(struct etc2_block *block, const uint8_t *src)
+{
+ unsigned i;
+ GLboolean diffbit = src[3] & 0x2;
+ 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 (!diffbit) {
+ /* 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){
+ /* H mode */
+ block->is_h_mode = true;
+ int base_color_1_value, base_color_2_value;
+
+ 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;
+
+ 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) {
+ /* 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) {
+ /* 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];
+ block->flipped = (src[3] & 0x1);
+ }
+
+ block->pixel_indices =
+ (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)
+{
+ const uint8_t *base_color;
+ int modifier, bit, idx, blk;
+
+ /* get pixel index */
+ bit = y + x * 4;
+ idx = ((block->pixel_indices >> (15 + bit)) & 0x2) |
+ ((block->pixel_indices >> (bit)) & 0x1);
+
+ if (block->is_ind_mode || block->is_diff_mode) {
+ /* 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) {
+ /* 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);
+ }
+}
+
+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;
+
+ for (x = 0; x < width; x+= bw) {
+ etc2_rgb8_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_rgb8_fetch_texel(&block, i, j, dst);
+ dst[3] = 255;
+ dst += comps;
+ }
+ }
+
+ src += bs;
+ }
+
+ src_row += src_stride;
+ }
+}
+
+/* ETC2 texture formats are valid in glCompressedTexImage2D and
+ * glCompressedTexSubImage2D functions */
+GLboolean
+_mesa_texstore_etc2_rgb8(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)
+{
+ struct etc2_block block;
+ uint8_t dst[3];
+ const uint8_t *src;
+
+ src = 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);
+
+ 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;
+}
+
+
+/**
+ * Decode texture data in format `MESA_FORMAT_ETC2_RGB8`
+ *
+ * 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,
+ gl_format format)
+{
+ etc2_unpack_rgb8(dst_row, dst_stride,
+ src_row, src_stride,
+ src_width, src_height);
+}
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