diff options
author | Anuj Phogat <[email protected]> | 2012-11-12 16:28:07 -0800 |
---|---|---|
committer | Ian Romanick <[email protected]> | 2012-12-07 16:29:48 -0800 |
commit | dc86cb3705eb8af51e4a951f24bb1b67c4929dc8 (patch) | |
tree | e5984e0d2cd0a71607051dbb158158d88f8c4ba9 /src/mesa/main/texcompress_etc.c | |
parent | 5ea8cd008426a0d92a524ccb747b8d3c02f1142a (diff) |
mesa: Add decoding functions for GL_COMPRESSED_R11_EAC
Data in GL_COMPRESSED_R11_EAC format is decoded and stored in
MESA_FORMAT_R16.
Signed-off-by: Anuj Phogat <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Diffstat (limited to 'src/mesa/main/texcompress_etc.c')
-rw-r--r-- | src/mesa/main/texcompress_etc.c | 122 |
1 files changed, 119 insertions, 3 deletions
diff --git a/src/mesa/main/texcompress_etc.c b/src/mesa/main/texcompress_etc.c index d704388d630..7137eca909d 100644 --- a/src/mesa/main/texcompress_etc.c +++ b/src/mesa/main/texcompress_etc.c @@ -29,6 +29,7 @@ * GL_COMPRESSED_SRGB8_ETC2 * GL_COMPRESSED_RGBA8_ETC2_EAC * GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC + * GL_COMPRESSED_R11_EAC */ #include <stdbool.h> @@ -304,6 +305,14 @@ etc2_base_color_v_planar(const uint8_t *in, GLuint index) } } +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) { @@ -311,6 +320,13 @@ etc2_clamp(int color) return (uint8_t) CLAMP(color, 0, 255); } +static GLushort +etc2_clamp2(int color) +{ + /* CLAMP(color, 0, 2047) */ + return (GLushort) CLAMP(color, 0, 2047); +} + static void etc2_rgb8_parse_block(struct etc2_block *block, const uint8_t *src) { @@ -486,16 +502,41 @@ static void etc2_alpha8_fetch_texel(const struct etc2_block *block, int x, int y, uint8_t *dst) { - int modifier, alpha, bit, idx; + int modifier, alpha, idx; /* get pixel index */ - bit = ((3 - y) + (3 - x) * 4) * 3; - idx = (block->pixel_indices[1] >> bit) & 0x7; + 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_alpha8_parse_block(struct etc2_block *block, const uint8_t *src) { block->base_codeword = src[0]; @@ -510,6 +551,13 @@ etc2_alpha8_parse_block(struct etc2_block *block, const uint8_t *src) } 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 */ @@ -680,6 +728,41 @@ etc2_unpack_srgb8_alpha8(uint8_t *dst_row, } } +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 uint8_t *src = src_row; + + for (x = 0; x < width; x+= bw) { + etc2_r11_parse_block(&block, src); + + for (j = 0; j < bh; j++) { + uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps * comp_size; + for (i = 0; i < bw; i++) { + etc2_r11_fetch_texel(&block, i, j, dst); + dst += comps * comp_size; + } + } + src += bs; + } + + src_row += src_stride; + } +} + /* ETC2 texture formats are valid in glCompressedTexImage2D and * glCompressedTexSubImage2D functions */ GLboolean @@ -714,6 +797,14 @@ _mesa_texstore_etc2_srgb8_alpha8_eac(TEXSTORE_PARAMS) return GL_FALSE; } +GLboolean +_mesa_texstore_etc2_r11_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) @@ -796,12 +887,33 @@ _mesa_fetch_texel_2d_f_etc2_srgb8_alpha8_eac(const struct texel[ACOMP] = UBYTE_TO_FLOAT(dst[3]); } +void +_mesa_fetch_texel_2d_f_etc2_r11_eac(const struct swrast_texture_image *texImage, + GLint i, GLint j, GLint k, GLfloat *texel) +{ + struct etc2_block block; + GLushort dst; + const uint8_t *src; + + src = texImage->Map + + (((texImage->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; +} + /** * 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` * * 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. @@ -836,4 +948,8 @@ _mesa_unpack_etc2_format(uint8_t *dst_row, etc2_unpack_srgb8_alpha8(dst_row, dst_stride, src_row, src_stride, src_width, src_height); + else if (format == MESA_FORMAT_ETC2_R11_EAC) + etc2_unpack_r11(dst_row, dst_stride, + src_row, src_stride, + src_width, src_height); } |