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-rw-r--r--src/mesa/main/texcompress_etc.c71
-rw-r--r--src/mesa/main/texcompress_etc.h40
-rw-r--r--src/mesa/main/texcompress_etc_tmp.h136
3 files changed, 247 insertions, 0 deletions
diff --git a/src/mesa/main/texcompress_etc.c b/src/mesa/main/texcompress_etc.c
new file mode 100644
index 00000000000..4d3b857cfc3
--- /dev/null
+++ b/src/mesa/main/texcompress_etc.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2011 LunarG, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file texcompress_etc.c
+ * GL_OES_compressed_ETC1_RGB8_texture support.
+ */
+
+
+#include "mfeatures.h"
+#include "texcompress.h"
+#include "texcompress_etc.h"
+#include "texstore.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);
+
+ return GL_FALSE;
+}
+
+/* define etc1_parse_block and etc. */
+#define UINT8_TYPE GLubyte
+#define TAG(x) x
+#include "texcompress_etc_tmp.h"
+#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)
+{
+ struct etc1_block block;
+ GLubyte dst[3];
+ const GLubyte *src;
+
+ src = (const GLubyte *) texImage->Data +
+ (((texImage->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;
+}
diff --git a/src/mesa/main/texcompress_etc.h b/src/mesa/main/texcompress_etc.h
new file mode 100644
index 00000000000..4e166b2b1fc
--- /dev/null
+++ b/src/mesa/main/texcompress_etc.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2011 LunarG, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef TEXCOMPRESS_ETC1_H
+#define TEXCOMPRESS_ETC1_H
+
+#include "glheader.h"
+#include "mfeatures.h"
+#include "texstore.h"
+
+struct swrast_texture_image;
+
+extern GLboolean
+_mesa_texstore_etc1_rgb8(TEXSTORE_PARAMS);
+
+extern void
+_mesa_fetch_texel_2d_f_etc1_rgb8(const struct swrast_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLfloat *texel);
+
+#endif
diff --git a/src/mesa/main/texcompress_etc_tmp.h b/src/mesa/main/texcompress_etc_tmp.h
new file mode 100644
index 00000000000..5c8c6decf8d
--- /dev/null
+++ b/src/mesa/main/texcompress_etc_tmp.h
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2011 LunarG, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * Included by texcompress_etc1 and gallium to define ETC1 decoding routines.
+ */
+
+struct TAG(etc1_block) {
+ uint32_t pixel_indices;
+ int flipped;
+ const int *modifier_tables[2];
+ UINT8_TYPE base_colors[2][3];
+};
+
+static UINT8_TYPE
+TAG(etc1_base_color_diff_hi)(UINT8_TYPE in)
+{
+ return (in & 0xf8) | (in >> 5);
+}
+
+static UINT8_TYPE
+TAG(etc1_base_color_diff_lo)(UINT8_TYPE in)
+{
+ static const int lookup[8] = { 0, 1, 2, 3, -4, -3, -2, -1 };
+
+ in = (in >> 3) + lookup[in & 0x7];
+
+ return (in << 3) | (in >> 2);
+}
+
+static UINT8_TYPE
+TAG(etc1_base_color_ind_hi)(UINT8_TYPE in)
+{
+ return (in & 0xf0) | ((in & 0xf0) >> 4);
+}
+
+static UINT8_TYPE
+TAG(etc1_base_color_ind_lo)(UINT8_TYPE in)
+{
+ return ((in & 0xf) << 4) | (in & 0xf);
+}
+
+static UINT8_TYPE
+TAG(etc1_clamp)(UINT8_TYPE base, int modifier)
+{
+ int tmp = (int) base + modifier;
+
+ /* CLAMP(tmp, 0, 255) */
+ return (UINT8_TYPE) ((tmp < 0) ? 0 : ((tmp > 255) ? 255 : tmp));
+}
+
+static const int TAG(etc1_modifier_tables)[8][4] = {
+ { 2, 8, -2, -8},
+ { 5, 17, -5, -17},
+ { 9, 29, -9, -29},
+ { 13, 42, -13, -42},
+ { 18, 60, -18, -60},
+ { 24, 80, -24, -80},
+ { 33, 106, -33, -106},
+ { 47, 183, -47, -183}
+};
+
+static void
+TAG(etc1_parse_block)(struct TAG(etc1_block) *block, const UINT8_TYPE *src)
+{
+ if (src[3] & 0x2) {
+ /* differential mode */
+ block->base_colors[0][0] = (int) TAG(etc1_base_color_diff_hi)(src[0]);
+ block->base_colors[1][0] = (int) TAG(etc1_base_color_diff_lo)(src[0]);
+ block->base_colors[0][1] = (int) TAG(etc1_base_color_diff_hi)(src[1]);
+ block->base_colors[1][1] = (int) TAG(etc1_base_color_diff_lo)(src[1]);
+ block->base_colors[0][2] = (int) TAG(etc1_base_color_diff_hi)(src[2]);
+ block->base_colors[1][2] = (int) TAG(etc1_base_color_diff_lo)(src[2]);
+ }
+ else {
+ /* individual mode */
+ block->base_colors[0][0] = (int) TAG(etc1_base_color_ind_hi)(src[0]);
+ block->base_colors[1][0] = (int) TAG(etc1_base_color_ind_lo)(src[0]);
+ block->base_colors[0][1] = (int) TAG(etc1_base_color_ind_hi)(src[1]);
+ block->base_colors[1][1] = (int) TAG(etc1_base_color_ind_lo)(src[1]);
+ block->base_colors[0][2] = (int) TAG(etc1_base_color_ind_hi)(src[2]);
+ block->base_colors[1][2] = (int) TAG(etc1_base_color_ind_lo)(src[2]);
+ }
+
+ /* pick modifier tables */
+ block->modifier_tables[0] = TAG(etc1_modifier_tables)[(src[3] >> 5) & 0x7];
+ block->modifier_tables[1] = TAG(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
+TAG(etc1_fetch_texel)(const struct TAG(etc1_block) *block,
+ int x, int y, UINT8_TYPE *dst)
+{
+ const UINT8_TYPE *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);
+
+ /* get subblock */
+ blk = (block->flipped) ? (y >= 2) : (x >= 2);
+
+ base_color = block->base_colors[blk];
+ modifier = block->modifier_tables[blk][idx];
+
+ dst[0] = TAG(etc1_clamp)(base_color[0], modifier);
+ dst[1] = TAG(etc1_clamp)(base_color[1], modifier);
+ dst[2] = TAG(etc1_clamp)(base_color[2], modifier);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 18:54:56 +0000