From 81911101eedffed5ab13bce5a76bbcd2eefaffd6 Mon Sep 17 00:00:00 2001 From: Anuj Phogat Date: Mon, 17 Sep 2012 14:47:56 -0700 Subject: [PATCH] mesa: Add decoding functions for GL_COMPRESSED_RGB8_ETC2 Data in GL_COMPRESSED_RGB8_ETC2 format is decoded and stored in MESA_FORMAT_RGBX8888_REV. v2: Use CLAMP macro and stdbool.h Signed-off-by: Anuj Phogat Reviewed-by: Brian Paul --- src/mesa/main/texcompress.c | 2 +- src/mesa/main/texcompress_etc.c | 460 +++++++++++++++++++++++++++++++- src/mesa/main/texcompress_etc.h | 16 +- src/mesa/main/texstore.c | 2 +- src/mesa/swrast/s_texfetch.c | 2 +- 5 files changed, 469 insertions(+), 13 deletions(-) diff --git a/src/mesa/main/texcompress.c b/src/mesa/main/texcompress.c index 58b346be394..3394be9f6ad 100644 --- a/src/mesa/main/texcompress.c +++ b/src/mesa/main/texcompress.c @@ -608,7 +608,7 @@ _mesa_decompress_image(gl_format format, GLuint width, GLuint height, /* ETC2 formats */ case MESA_FORMAT_ETC2_RGB8: - /* fetch = _mesa_fetch_texel_2d_f_etc2_rgb8; -- not implemented yet */ + fetch = _mesa_fetch_texel_2d_f_etc2_rgb8; break; case MESA_FORMAT_ETC2_SRGB8: /* fetch = _mesa_fetch_texel_2d_f_etc2_srgb8; -- not implemented yet */ diff --git a/src/mesa/main/texcompress_etc.c b/src/mesa/main/texcompress_etc.c index c645f52b9e1..42ef74a7d1f 100644 --- a/src/mesa/main/texcompress_etc.c +++ b/src/mesa/main/texcompress_etc.c @@ -24,9 +24,11 @@ /** * \file texcompress_etc.c * GL_OES_compressed_ETC1_RGB8_texture support. + * Supported ETC2 texture formats are: + * GL_COMPRESSED_RGB8_ETC2 */ - +#include #include "mfeatures.h" #include "texcompress.h" #include "texcompress_etc.h" @@ -34,14 +36,22 @@ #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 @@ -50,6 +60,15 @@ _mesa_texstore_etc1_rgb8(TEXSTORE_PARAMS) #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) @@ -101,3 +120,428 @@ _mesa_etc1_unpack_rgba8888(uint8_t *dst_row, 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); +} diff --git a/src/mesa/main/texcompress_etc.h b/src/mesa/main/texcompress_etc.h index 411e1540d30..2508f5fa3a3 100644 --- a/src/mesa/main/texcompress_etc.h +++ b/src/mesa/main/texcompress_etc.h @@ -34,10 +34,15 @@ struct swrast_texture_image; GLboolean _mesa_texstore_etc1_rgb8(TEXSTORE_PARAMS); +GLboolean +_mesa_texstore_etc2_rgb8(TEXSTORE_PARAMS); + void _mesa_fetch_texel_2d_f_etc1_rgb8(const struct swrast_texture_image *texImage, GLint i, GLint j, GLint k, GLfloat *texel); - +void +_mesa_fetch_texel_2d_f_etc2_rgb8(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, @@ -45,5 +50,12 @@ _mesa_etc1_unpack_rgba8888(uint8_t *dst_row, unsigned src_stride, unsigned src_width, unsigned src_height); - +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); #endif diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c index b542e5cfcb6..0908b33e54f 100644 --- a/src/mesa/main/texstore.c +++ b/src/mesa/main/texstore.c @@ -4124,7 +4124,7 @@ _mesa_get_texstore_func(gl_format format) table[MESA_FORMAT_LA_LATC2] = _mesa_texstore_rg_rgtc2; table[MESA_FORMAT_SIGNED_LA_LATC2] = _mesa_texstore_signed_rg_rgtc2; table[MESA_FORMAT_ETC1_RGB8] = _mesa_texstore_etc1_rgb8; - /* table[MESA_FORMAT_ETC2_RGB8] = _mesa_texstore_etc2_rgb8; -- not implemented yet */ + table[MESA_FORMAT_ETC2_RGB8] = _mesa_texstore_etc2_rgb8; /* table[MESA_FORMAT_ETC2_SRGB8] = _mesa_texstore_etc2_srgb8; -- not implemented yet */ /* table[MESA_FORMAT_ETC2_RGBA8_EAC] = _mesa_texstore_etc2_rgba8_eac; -- not implemented yet */ /* table[MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC] = _mesa_texstore_etc2_srgb8_alpha8_eac; -- not implemented yet */ diff --git a/src/mesa/swrast/s_texfetch.c b/src/mesa/swrast/s_texfetch.c index 8f0f9b754ef..c1e16b4390e 100644 --- a/src/mesa/swrast/s_texfetch.c +++ b/src/mesa/swrast/s_texfetch.c @@ -1031,7 +1031,7 @@ texfetch_funcs[] = { MESA_FORMAT_ETC2_RGB8, NULL, - NULL /* _mesa_fetch_texel_2d_f_etc2_rgb8 -- not implemented yet */, + _mesa_fetch_texel_2d_f_etc2_rgb8, NULL }, { -- 2.30.2