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-rw-r--r--src/shaders/lut.c820
1 files changed, 820 insertions, 0 deletions
diff --git a/src/shaders/lut.c b/src/shaders/lut.c
new file mode 100644
index 0000000..b0124fc
--- /dev/null
+++ b/src/shaders/lut.c
@@ -0,0 +1,820 @@
+/*
+ * This file is part of libplacebo.
+ *
+ * libplacebo is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * libplacebo is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with libplacebo. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+#include <ctype.h>
+
+#include "shaders.h"
+
+#include <libplacebo/shaders/lut.h>
+
+static inline bool isnumeric(char c)
+{
+ return (c >= '0' && c <= '9') || c == '-';
+}
+
+void pl_lut_free(struct pl_custom_lut **lut)
+{
+ pl_free_ptr(lut);
+}
+
+struct pl_custom_lut *pl_lut_parse_cube(pl_log log, const char *cstr, size_t cstr_len)
+{
+ struct pl_custom_lut *lut = pl_zalloc_ptr(NULL, lut);
+ pl_str str = (pl_str) { (uint8_t *) cstr, cstr_len };
+ lut->signature = pl_str_hash(str);
+ int entries = 0;
+
+ float min[3] = { 0.0, 0.0, 0.0 };
+ float max[3] = { 1.0, 1.0, 1.0 };
+
+ // Parse header
+ while (str.len && !isnumeric(str.buf[0])) {
+ pl_str line = pl_str_strip(pl_str_getline(str, &str));
+ if (!line.len)
+ continue; // skip empty line
+
+ if (pl_str_eatstart0(&line, "TITLE")) {
+ pl_info(log, "Loading LUT: %.*s", PL_STR_FMT(pl_str_strip(line)));
+ continue;
+ }
+
+ if (pl_str_eatstart0(&line, "LUT_3D_SIZE")) {
+ line = pl_str_strip(line);
+ int size;
+ if (!pl_str_parse_int(line, &size)) {
+ pl_err(log, "Failed parsing dimension '%.*s'", PL_STR_FMT(line));
+ goto error;
+ }
+ if (size <= 0 || size > 1024) {
+ pl_err(log, "Invalid 3DLUT size: %dx%d%x", size, size, size);
+ goto error;
+ }
+
+ lut->size[0] = lut->size[1] = lut->size[2] = size;
+ entries = size * size * size;
+ continue;
+ }
+
+ if (pl_str_eatstart0(&line, "LUT_1D_SIZE")) {
+ line = pl_str_strip(line);
+ int size;
+ if (!pl_str_parse_int(line, &size)) {
+ pl_err(log, "Failed parsing dimension '%.*s'", PL_STR_FMT(line));
+ goto error;
+ }
+ if (size <= 0 || size > 65536) {
+ pl_err(log, "Invalid 1DLUT size: %d", size);
+ goto error;
+ }
+
+ lut->size[0] = size;
+ lut->size[1] = lut->size[2] = 0;
+ entries = size;
+ continue;
+ }
+
+ if (pl_str_eatstart0(&line, "DOMAIN_MIN")) {
+ line = pl_str_strip(line);
+ if (!pl_str_parse_float(pl_str_split_char(line, ' ', &line), &min[0]) ||
+ !pl_str_parse_float(pl_str_split_char(line, ' ', &line), &min[1]) ||
+ !pl_str_parse_float(line, &min[2]))
+ {
+ pl_err(log, "Failed parsing domain: '%.*s'", PL_STR_FMT(line));
+ goto error;
+ }
+ continue;
+ }
+
+ if (pl_str_eatstart0(&line, "DOMAIN_MAX")) {
+ line = pl_str_strip(line);
+ if (!pl_str_parse_float(pl_str_split_char(line, ' ', &line), &max[0]) ||
+ !pl_str_parse_float(pl_str_split_char(line, ' ', &line), &max[1]) ||
+ !pl_str_parse_float(line, &max[2]))
+ {
+ pl_err(log, "Failed parsing domain: '%.*s'", PL_STR_FMT(line));
+ goto error;
+ }
+ continue;
+ }
+
+ if (pl_str_eatstart0(&line, "#")) {
+ pl_debug(log, "Unhandled .cube comment: %.*s",
+ PL_STR_FMT(pl_str_strip(line)));
+ continue;
+ }
+
+ pl_warn(log, "Unhandled .cube line: %.*s", PL_STR_FMT(pl_str_strip(line)));
+ }
+
+ if (!entries) {
+ pl_err(log, "Missing LUT size specification?");
+ goto error;
+ }
+
+ for (int i = 0; i < 3; i++) {
+ if (max[i] - min[i] < 1e-6) {
+ pl_err(log, "Invalid domain range: [%f, %f]", min[i], max[i]);
+ goto error;
+ }
+ }
+
+ float *data = pl_alloc(lut, sizeof(float[3]) * entries);
+ lut->data = data;
+
+ // Parse LUT body
+ pl_clock_t start = pl_clock_now();
+ for (int n = 0; n < entries; n++) {
+ for (int c = 0; c < 3; c++) {
+ static const char * const digits = "0123456789.-+e";
+
+ // Extract valid digit sequence
+ size_t len = pl_strspn(str, digits);
+ pl_str entry = (pl_str) { str.buf, len };
+ str.buf += len;
+ str.len -= len;
+
+ if (!entry.len) {
+ if (!str.len) {
+ pl_err(log, "Failed parsing LUT: Unexpected EOF, expected "
+ "%d entries, got %d", entries * 3, n * 3 + c + 1);
+ } else {
+ pl_err(log, "Failed parsing LUT: Unexpected '%c', expected "
+ "digit", str.buf[0]);
+ }
+ goto error;
+ }
+
+ float num;
+ if (!pl_str_parse_float(entry, &num)) {
+ pl_err(log, "Failed parsing float value '%.*s'", PL_STR_FMT(entry));
+ goto error;
+ }
+
+ // Rescale to range 0.0 - 1.0
+ *data++ = (num - min[c]) / (max[c] - min[c]);
+
+ // Skip whitespace between digits
+ str = pl_str_strip(str);
+ }
+ }
+
+ str = pl_str_strip(str);
+ if (str.len)
+ pl_warn(log, "Extra data after LUT?... ignoring '%c'", str.buf[0]);
+
+ pl_log_cpu_time(log, start, pl_clock_now(), "parsing .cube LUT");
+ return lut;
+
+error:
+ pl_free(lut);
+ return NULL;
+}
+
+static void fill_lut(void *datap, const struct sh_lut_params *params)
+{
+ const struct pl_custom_lut *lut = params->priv;
+
+ int dim_r = params->width;
+ int dim_g = PL_DEF(params->height, 1);
+ int dim_b = PL_DEF(params->depth, 1);
+
+ float *data = datap;
+ for (int b = 0; b < dim_b; b++) {
+ for (int g = 0; g < dim_g; g++) {
+ for (int r = 0; r < dim_r; r++) {
+ size_t offset = (b * dim_g + g) * dim_r + r;
+ const float *src = &lut->data[offset * 3];
+ float *dst = &data[offset * 4];
+ dst[0] = src[0];
+ dst[1] = src[1];
+ dst[2] = src[2];
+ dst[3] = 0.0f;
+ }
+ }
+ }
+}
+
+void pl_shader_custom_lut(pl_shader sh, const struct pl_custom_lut *lut,
+ pl_shader_obj *lut_state)
+{
+ if (!lut)
+ return;
+
+ int dims;
+ if (lut->size[0] > 0 && lut->size[1] > 0 && lut->size[2] > 0) {
+ dims = 3;
+ } else if (lut->size[0] > 0 && !lut->size[1] && !lut->size[2]) {
+ dims = 1;
+ } else {
+ SH_FAIL(sh, "Invalid dimensions %dx%dx%d for pl_custom_lut, must be 1D "
+ "or 3D!", lut->size[0], lut->size[1], lut->size[2]);
+ return;
+ }
+
+ if (!sh_require(sh, PL_SHADER_SIG_COLOR, 0, 0))
+ return;
+
+ ident_t fun = sh_lut(sh, sh_lut_params(
+ .object = lut_state,
+ .var_type = PL_VAR_FLOAT,
+ .method = SH_LUT_TETRAHEDRAL,
+ .width = lut->size[0],
+ .height = lut->size[1],
+ .depth = lut->size[2],
+ .comps = 4, // for better texel alignment
+ .signature = lut->signature,
+ .fill = fill_lut,
+ .priv = (void *) lut,
+ ));
+
+ if (!fun) {
+ SH_FAIL(sh, "pl_shader_custom_lut: failed generating LUT object");
+ return;
+ }
+
+ GLSL("// pl_shader_custom_lut \n");
+
+ static const pl_matrix3x3 zero = {0};
+ if (memcmp(&lut->shaper_in, &zero, sizeof(zero)) != 0) {
+ GLSL("color.rgb = "$" * color.rgb; \n", sh_var(sh, (struct pl_shader_var) {
+ .var = pl_var_mat3("shaper_in"),
+ .data = PL_TRANSPOSE_3X3(lut->shaper_in.m),
+ }));
+ }
+
+ switch (dims) {
+ case 1:
+ sh_describe(sh, "custom 1DLUT");
+ GLSL("color.rgb = vec3("$"(color.r).r, \n"
+ " "$"(color.g).g, \n"
+ " "$"(color.b).b); \n",
+ fun, fun, fun);
+ break;
+ case 3:
+ sh_describe(sh, "custom 3DLUT");
+ GLSL("color.rgb = "$"(color.rgb).rgb; \n", fun);
+ break;
+ }
+
+ if (memcmp(&lut->shaper_out, &zero, sizeof(zero)) != 0) {
+ GLSL("color.rgb = "$" * color.rgb; \n", sh_var(sh, (struct pl_shader_var) {
+ .var = pl_var_mat3("shaper_out"),
+ .data = PL_TRANSPOSE_3X3(lut->shaper_out.m),
+ }));
+ }
+}
+
+// Defines a LUT position helper macro. This translates from an absolute texel
+// scale (either in texels, or normalized to [0,1]) to the texture coordinate
+// scale for the corresponding sample in a texture of dimension `lut_size`.
+static ident_t texel_scale(pl_shader sh, int lut_size, bool normalized)
+{
+ const float base = 0.5f / lut_size;
+ const float end = 1.0f - 0.5f / lut_size;
+ const float scale = (end - base) / (normalized ? 1.0f : (lut_size - 1));
+
+ ident_t name = sh_fresh(sh, "LUT_SCALE");
+ GLSLH("#define "$"(x) ("$" * (x) + "$") \n",
+ name, SH_FLOAT(scale), SH_FLOAT(base));
+ return name;
+}
+
+struct sh_lut_obj {
+ enum sh_lut_type type;
+ enum sh_lut_method method;
+ enum pl_var_type vartype;
+ pl_fmt fmt;
+ int width, height, depth, comps;
+ uint64_t signature;
+ bool error; // reset if params change
+
+ // weights, depending on the lut type
+ pl_tex tex;
+ pl_str str;
+ void *data;
+};
+
+static void sh_lut_uninit(pl_gpu gpu, void *ptr)
+{
+ struct sh_lut_obj *lut = ptr;
+ pl_tex_destroy(gpu, &lut->tex);
+ pl_free(lut->str.buf);
+ pl_free(lut->data);
+
+ *lut = (struct sh_lut_obj) {0};
+}
+
+// Maximum number of floats to embed as a literal array (when using SH_LUT_AUTO)
+#define SH_LUT_MAX_LITERAL_SOFT 64
+#define SH_LUT_MAX_LITERAL_HARD 256
+
+ident_t sh_lut(pl_shader sh, const struct sh_lut_params *params)
+{
+ pl_gpu gpu = SH_GPU(sh);
+ pl_cache_obj obj = { .key = CACHE_KEY_SH_LUT ^ params->signature };
+
+ const enum pl_var_type vartype = params->var_type;
+ pl_assert(vartype != PL_VAR_INVALID);
+ pl_assert(params->method == SH_LUT_NONE || vartype == PL_VAR_FLOAT);
+ pl_assert(params->width > 0 && params->height >= 0 && params->depth >= 0);
+ pl_assert(params->comps > 0);
+ pl_assert(!params->cache || params->signature);
+
+ int sizes[] = { params->width, params->height, params->depth };
+ int size = params->width * PL_DEF(params->height, 1) * PL_DEF(params->depth, 1);
+ int dims = params->depth ? 3 : params->height ? 2 : 1;
+ enum sh_lut_method method = params->method;
+ if (method == SH_LUT_TETRAHEDRAL && dims != 3)
+ method = SH_LUT_LINEAR;
+ if (method == SH_LUT_CUBIC && dims != 3)
+ method = SH_LUT_LINEAR;
+
+ int texdim = 0;
+ uint32_t max_tex_dim[] = {
+ gpu ? gpu->limits.max_tex_1d_dim : 0,
+ gpu ? gpu->limits.max_tex_2d_dim : 0,
+ (gpu && gpu->glsl.version > 100) ? gpu->limits.max_tex_3d_dim : 0,
+ };
+
+ struct sh_lut_obj *lut = SH_OBJ(sh, params->object, PL_SHADER_OBJ_LUT,
+ struct sh_lut_obj, sh_lut_uninit);
+
+ if (!lut)
+ return NULL_IDENT;
+
+ bool update = params->update || lut->signature != params->signature ||
+ vartype != lut->vartype || params->fmt != lut->fmt ||
+ params->width != lut->width || params->height != lut->height ||
+ params->depth != lut->depth || params->comps != lut->comps;
+
+ if (lut->error && !update)
+ return NULL_IDENT; // suppress error spam until something changes
+
+ // Try picking the right number of dimensions for the texture LUT. This
+ // allows e.g. falling back to 2D textures if 1D textures are unsupported.
+ for (int d = dims; d <= PL_ARRAY_SIZE(max_tex_dim); d++) {
+ // For a given dimension to be compatible, all coordinates need to be
+ // within the maximum texture size for that dimension
+ for (int i = 0; i < d; i++) {
+ if (sizes[i] > max_tex_dim[d - 1])
+ goto next_dim;
+ }
+
+ // All dimensions are compatible, so pick this texture dimension
+ texdim = d;
+ break;
+
+next_dim: ; // `continue` out of the inner loop
+ }
+
+ static const enum pl_fmt_type fmt_type[PL_VAR_TYPE_COUNT] = {
+ [PL_VAR_SINT] = PL_FMT_SINT,
+ [PL_VAR_UINT] = PL_FMT_UINT,
+ [PL_VAR_FLOAT] = PL_FMT_FLOAT,
+ };
+
+ enum pl_fmt_caps texcaps = PL_FMT_CAP_SAMPLEABLE;
+ bool is_linear = method == SH_LUT_LINEAR || method == SH_LUT_CUBIC;
+ if (is_linear)
+ texcaps |= PL_FMT_CAP_LINEAR;
+
+ pl_fmt texfmt = params->fmt;
+ if (texfmt) {
+ bool ok;
+ switch (texfmt->type) {
+ case PL_FMT_SINT: ok = vartype == PL_VAR_SINT; break;
+ case PL_FMT_UINT: ok = vartype == PL_VAR_UINT; break;
+ default: ok = vartype == PL_VAR_FLOAT; break;
+ }
+
+ if (!ok) {
+ PL_ERR(sh, "Specified texture format '%s' does not match LUT "
+ "data type!", texfmt->name);
+ goto error;
+ }
+
+ if (~texfmt->caps & texcaps) {
+ PL_ERR(sh, "Specified texture format '%s' does not match "
+ "required capabilities 0x%x!\n", texfmt->name, texcaps);
+ goto error;
+ }
+ }
+
+ if (texdim && !texfmt) {
+ texfmt = pl_find_fmt(gpu, fmt_type[vartype], params->comps,
+ vartype == PL_VAR_FLOAT ? 16 : 32,
+ pl_var_type_size(vartype) * 8,
+ texcaps);
+ }
+
+ enum sh_lut_type type = params->lut_type;
+
+ // The linear sampling code currently only supports 1D linear interpolation
+ if (is_linear && dims > 1) {
+ if (texfmt) {
+ type = SH_LUT_TEXTURE;
+ } else {
+ PL_ERR(sh, "Can't emulate linear LUTs for 2D/3D LUTs and no "
+ "texture support available!");
+ goto error;
+ }
+ }
+
+ bool can_uniform = gpu && gpu->limits.max_variable_comps >= size * params->comps;
+ bool can_literal = sh_glsl(sh).version > 110; // needed for literal arrays
+ can_literal &= size <= SH_LUT_MAX_LITERAL_HARD && !params->dynamic;
+
+ // Deselect unsupported methods
+ if (type == SH_LUT_UNIFORM && !can_uniform)
+ type = SH_LUT_AUTO;
+ if (type == SH_LUT_LITERAL && !can_literal)
+ type = SH_LUT_AUTO;
+ if (type == SH_LUT_TEXTURE && !texfmt)
+ type = SH_LUT_AUTO;
+
+ // Sorted by priority
+ if (!type && can_literal && !method && size <= SH_LUT_MAX_LITERAL_SOFT)
+ type = SH_LUT_LITERAL;
+ if (!type && texfmt)
+ type = SH_LUT_TEXTURE;
+ if (!type && can_uniform)
+ type = SH_LUT_UNIFORM;
+ if (!type && can_literal)
+ type = SH_LUT_LITERAL;
+
+ if (!type) {
+ PL_ERR(sh, "Can't generate LUT: no compatible methods!");
+ goto error;
+ }
+
+ // Reinitialize the existing LUT if needed
+ update |= type != lut->type;
+ update |= method != lut->method;
+
+ if (update) {
+ if (params->dynamic)
+ pl_log_level_cap(sh->log, PL_LOG_TRACE);
+
+ size_t el_size = params->comps * pl_var_type_size(vartype);
+ if (type == SH_LUT_TEXTURE)
+ el_size = texfmt->texel_size;
+
+ size_t buf_size = size * el_size;
+ if (pl_cache_get(params->cache, &obj) && obj.size == buf_size) {
+ PL_DEBUG(sh, "Re-using cached LUT (0x%"PRIx64") with size %zu",
+ obj.key, obj.size);
+ } else {
+ PL_DEBUG(sh, "LUT invalidated, regenerating..");
+ pl_cache_obj_resize(NULL, &obj, buf_size);
+ pl_clock_t start = pl_clock_now();
+ params->fill(obj.data, params);
+ pl_log_cpu_time(sh->log, start, pl_clock_now(), "generating shader LUT");
+ }
+
+ pl_assert(obj.data && obj.size);
+ if (params->dynamic)
+ pl_log_level_cap(sh->log, PL_LOG_NONE);
+
+ switch (type) {
+ case SH_LUT_TEXTURE: {
+ if (!texdim) {
+ PL_ERR(sh, "Texture LUT exceeds texture dimensions!");
+ goto error;
+ }
+
+ if (!texfmt) {
+ PL_ERR(sh, "Found no compatible texture format for LUT!");
+ goto error;
+ }
+
+ struct pl_tex_params tex_params = {
+ .w = params->width,
+ .h = PL_DEF(params->height, texdim >= 2 ? 1 : 0),
+ .d = PL_DEF(params->depth, texdim >= 3 ? 1 : 0),
+ .format = texfmt,
+ .sampleable = true,
+ .host_writable = params->dynamic,
+ .initial_data = params->dynamic ? NULL : obj.data,
+ .debug_tag = params->debug_tag,
+ };
+
+ bool ok;
+ if (params->dynamic) {
+ ok = pl_tex_recreate(gpu, &lut->tex, &tex_params);
+ if (ok) {
+ ok = pl_tex_upload(gpu, pl_tex_transfer_params(
+ .tex = lut->tex,
+ .ptr = obj.data,
+ ));
+ }
+ } else {
+ // Can't use pl_tex_recreate because of `initial_data`
+ pl_tex_destroy(gpu, &lut->tex);
+ lut->tex = pl_tex_create(gpu, &tex_params);
+ ok = lut->tex;
+ }
+
+ if (!ok) {
+ PL_ERR(sh, "Failed creating LUT texture!");
+ goto error;
+ }
+ break;
+ }
+
+ case SH_LUT_UNIFORM:
+ pl_free(lut->data);
+ lut->data = pl_memdup(NULL, obj.data, obj.size);
+ break;
+
+ case SH_LUT_LITERAL: {
+ lut->str.len = 0;
+ static const char prefix[PL_VAR_TYPE_COUNT] = {
+ [PL_VAR_SINT] = 'i',
+ [PL_VAR_UINT] = 'u',
+ [PL_VAR_FLOAT] = ' ',
+ };
+
+ for (int i = 0; i < size * params->comps; i += params->comps) {
+ if (i > 0)
+ pl_str_append_asprintf_c(lut, &lut->str, ",");
+ if (params->comps > 1) {
+ pl_str_append_asprintf_c(lut, &lut->str, "%cvec%d(",
+ prefix[vartype], params->comps);
+ }
+ for (int c = 0; c < params->comps; c++) {
+ switch (vartype) {
+ case PL_VAR_FLOAT:
+ pl_str_append_asprintf_c(lut, &lut->str, "%s%f",
+ c > 0 ? "," : "",
+ ((float *) obj.data)[i+c]);
+ break;
+ case PL_VAR_UINT:
+ pl_str_append_asprintf_c(lut, &lut->str, "%s%u",
+ c > 0 ? "," : "",
+ ((unsigned int *) obj.data)[i+c]);
+ break;
+ case PL_VAR_SINT:
+ pl_str_append_asprintf_c(lut, &lut->str, "%s%d",
+ c > 0 ? "," : "",
+ ((int *) obj.data)[i+c]);
+ break;
+ case PL_VAR_INVALID:
+ case PL_VAR_TYPE_COUNT:
+ pl_unreachable();
+ }
+ }
+ if (params->comps > 1)
+ pl_str_append_asprintf_c(lut, &lut->str, ")");
+ }
+ break;
+ }
+
+ case SH_LUT_AUTO:
+ pl_unreachable();
+ }
+
+ lut->type = type;
+ lut->method = method;
+ lut->vartype = vartype;
+ lut->fmt = params->fmt;
+ lut->width = params->width;
+ lut->height = params->height;
+ lut->depth = params->depth;
+ lut->comps = params->comps;
+ lut->signature = params->signature;
+ pl_cache_set(params->cache, &obj);
+ }
+
+ // Done updating, generate the GLSL
+ ident_t name = sh_fresh(sh, "lut");
+ ident_t arr_name = NULL_IDENT;
+
+ static const char * const swizzles[] = {"x", "xy", "xyz", "xyzw"};
+ static const char * const vartypes[PL_VAR_TYPE_COUNT][4] = {
+ [PL_VAR_SINT] = { "int", "ivec2", "ivec3", "ivec4" },
+ [PL_VAR_UINT] = { "uint", "uvec2", "uvec3", "uvec4" },
+ [PL_VAR_FLOAT] = { "float", "vec2", "vec3", "vec4" },
+ };
+
+ switch (type) {
+ case SH_LUT_TEXTURE: {
+ assert(texdim);
+ ident_t tex = sh_desc(sh, (struct pl_shader_desc) {
+ .desc = {
+ .name = "weights",
+ .type = PL_DESC_SAMPLED_TEX,
+ },
+ .binding = {
+ .object = lut->tex,
+ .sample_mode = is_linear ? PL_TEX_SAMPLE_LINEAR
+ : PL_TEX_SAMPLE_NEAREST,
+ }
+ });
+
+ if (is_linear) {
+ ident_t pos_macros[PL_ARRAY_SIZE(sizes)] = {0};
+ for (int i = 0; i < dims; i++)
+ pos_macros[i] = texel_scale(sh, sizes[i], true);
+
+ GLSLH("#define "$"(pos) (textureLod("$", %s(\\\n",
+ name, tex, vartypes[PL_VAR_FLOAT][texdim - 1]);
+
+ for (int i = 0; i < texdim; i++) {
+ char sep = i == 0 ? ' ' : ',';
+ if (pos_macros[i]) {
+ if (dims > 1) {
+ GLSLH(" %c"$"(%s(pos).%c)\\\n", sep, pos_macros[i],
+ vartypes[PL_VAR_FLOAT][dims - 1], "xyzw"[i]);
+ } else {
+ GLSLH(" %c"$"(float(pos))\\\n", sep, pos_macros[i]);
+ }
+ } else {
+ GLSLH(" %c%f\\\n", sep, 0.5);
+ }
+ }
+ GLSLH(" ), 0.0).%s)\n", swizzles[params->comps - 1]);
+ } else {
+ GLSLH("#define "$"(pos) (texelFetch("$", %s(pos",
+ name, tex, vartypes[PL_VAR_SINT][texdim - 1]);
+
+ // Fill up extra components of the index
+ for (int i = dims; i < texdim; i++)
+ GLSLH(", 0");
+
+ GLSLH("), 0).%s)\n", swizzles[params->comps - 1]);
+ }
+ break;
+ }
+
+ case SH_LUT_UNIFORM:
+ arr_name = sh_var(sh, (struct pl_shader_var) {
+ .var = {
+ .name = "weights",
+ .type = vartype,
+ .dim_v = params->comps,
+ .dim_m = 1,
+ .dim_a = size,
+ },
+ .data = lut->data,
+ });
+ break;
+
+ case SH_LUT_LITERAL:
+ arr_name = sh_fresh(sh, "weights");
+ GLSLH("const %s "$"[%d] = %s[](\n ",
+ vartypes[vartype][params->comps - 1], arr_name, size,
+ vartypes[vartype][params->comps - 1]);
+ sh_append_str(sh, SH_BUF_HEADER, lut->str);
+ GLSLH(");\n");
+ break;
+
+ case SH_LUT_AUTO:
+ pl_unreachable();
+ }
+
+ if (arr_name) {
+ GLSLH("#define "$"(pos) ("$"[int((pos)%s)\\\n",
+ name, arr_name, dims > 1 ? "[0]" : "");
+ int shift = params->width;
+ for (int i = 1; i < dims; i++) {
+ GLSLH(" + %d * int((pos)[%d])\\\n", shift, i);
+ shift *= sizes[i];
+ }
+ GLSLH(" ])\n");
+
+ if (is_linear) {
+ pl_assert(dims == 1);
+ pl_assert(vartype == PL_VAR_FLOAT);
+ ident_t arr_lut = name;
+ name = sh_fresh(sh, "lut_lin");
+ GLSLH("%s "$"(float fpos) { \n"
+ " fpos = clamp(fpos, 0.0, 1.0) * %d.0; \n"
+ " float fbase = floor(fpos); \n"
+ " float fceil = ceil(fpos); \n"
+ " float fcoord = fpos - fbase; \n"
+ " return mix("$"(fbase), "$"(fceil), fcoord); \n"
+ "} \n",
+ vartypes[PL_VAR_FLOAT][params->comps - 1], name,
+ size - 1,
+ arr_lut, arr_lut);
+ }
+ }
+
+ if (method == SH_LUT_CUBIC && dims == 3) {
+ ident_t lin_lut = name;
+ name = sh_fresh(sh, "lut_tricubic");
+ GLSLH("%s "$"(vec3 pos) { \n"
+ " vec3 scale = vec3(%d.0, %d.0, %d.0); \n"
+ " vec3 scale_inv = 1.0 / scale; \n"
+ " pos *= scale; \n"
+ " vec3 fpos = fract(pos); \n"
+ " vec3 base = pos - fpos; \n"
+ " vec3 fpos2 = fpos * fpos; \n"
+ " vec3 inv = 1.0 - fpos; \n"
+ " vec3 inv2 = inv * inv; \n"
+ " vec3 w0 = 1.0/6.0 * inv2 * inv; \n"
+ " vec3 w1 = 2.0/3.0 - 0.5 * fpos2 * (2.0 - fpos); \n"
+ " vec3 w2 = 2.0/3.0 - 0.5 * inv2 * (2.0 - inv); \n"
+ " vec3 w3 = 1.0/6.0 * fpos2 * fpos; \n"
+ " vec3 g0 = w0 + w1; \n"
+ " vec3 g1 = w2 + w3; \n"
+ " vec3 h0 = scale_inv * ((w1 / g0) - 1.0 + base); \n"
+ " vec3 h1 = scale_inv * ((w3 / g1) + 1.0 + base); \n"
+ " %s c000, c001, c010, c011, c100, c101, c110, c111; \n"
+ " c000 = "$"(h0); \n"
+ " c100 = "$"(vec3(h1.x, h0.y, h0.z)); \n"
+ " c000 = mix(c100, c000, g0.x); \n"
+ " c010 = "$"(vec3(h0.x, h1.y, h0.z)); \n"
+ " c110 = "$"(vec3(h1.x, h1.y, h0.z)); \n"
+ " c010 = mix(c110, c010, g0.x); \n"
+ " c000 = mix(c010, c000, g0.y); \n"
+ " c001 = "$"(vec3(h0.x, h0.y, h1.z)); \n"
+ " c101 = "$"(vec3(h1.x, h0.y, h1.z)); \n"
+ " c001 = mix(c101, c001, g0.x); \n"
+ " c011 = "$"(vec3(h0.x, h1.y, h1.z)); \n"
+ " c111 = "$"(h1); \n"
+ " c011 = mix(c111, c011, g0.x); \n"
+ " c001 = mix(c011, c001, g0.y); \n"
+ " return mix(c001, c000, g0.z); \n"
+ "} \n",
+ vartypes[PL_VAR_FLOAT][params->comps - 1], name,
+ sizes[0] - 1, sizes[1] - 1, sizes[2] - 1,
+ vartypes[PL_VAR_FLOAT][params->comps - 1],
+ lin_lut, lin_lut, lin_lut, lin_lut,
+ lin_lut, lin_lut, lin_lut, lin_lut);
+ }
+
+ if (method == SH_LUT_TETRAHEDRAL) {
+ ident_t int_lut = name;
+ name = sh_fresh(sh, "lut_barycentric");
+ GLSLH("%s "$"(vec3 pos) { \n"
+ // Compute bounding vertices and fractional part
+ " pos = clamp(pos, 0.0, 1.0) * vec3(%d.0, %d.0, %d.0); \n"
+ " vec3 base = floor(pos); \n"
+ " vec3 fpart = pos - base; \n"
+ // v0 and v3 are always 'black' and 'white', respectively
+ // v1 and v2 are the closest RGB and CMY vertices, respectively
+ " ivec3 v0 = ivec3(base), v3 = ivec3(ceil(pos)); \n"
+ " ivec3 v1 = v0, v2 = v3; \n"
+ // Table of boolean checks to simplify following math
+ " bvec3 c = greaterThanEqual(fpart.xyz, fpart.yzx); \n"
+ " bool c_xy = c.x, c_yx = !c.x, \n"
+ " c_yz = c.y, c_zy = !c.y, \n"
+ " c_zx = c.z, c_xz = !c.z; \n"
+ " vec3 s = fpart.xyz; \n"
+ " bool cond; \n",
+ vartypes[PL_VAR_FLOAT][params->comps - 1], name,
+ sizes[0] - 1, sizes[1] - 1, sizes[2] - 1);
+
+ // Subdivision of the cube into six congruent tetrahedras
+ //
+ // For each tetrahedron, test if the point is inside, and if so, update
+ // the edge vertices. We test all six, even though only one case will
+ // ever be true, because this avoids branches.
+ static const char *indices[] = { "xyz", "xzy", "zxy", "zyx", "yzx", "yxz"};
+ for (int i = 0; i < PL_ARRAY_SIZE(indices); i++) {
+ const char x = indices[i][0], y = indices[i][1], z = indices[i][2];
+ GLSLH("cond = c_%c%c && c_%c%c; \n"
+ "s = cond ? fpart.%c%c%c : s; \n"
+ "v1.%c = cond ? v3.%c : v1.%c; \n"
+ "v2.%c = cond ? v0.%c : v2.%c; \n",
+ x, y, y, z,
+ x, y, z,
+ x, x, x,
+ z, z, z);
+ }
+
+ // Interpolate in barycentric coordinates, with four texel fetches
+ GLSLH(" return (1.0 - s.x) * "$"(v0) + \n"
+ " (s.x - s.y) * "$"(v1) + \n"
+ " (s.y - s.z) * "$"(v2) + \n"
+ " (s.z) * "$"(v3); \n"
+ "} \n",
+ int_lut, int_lut, int_lut, int_lut);
+ }
+
+ lut->error = false;
+ pl_cache_obj_free(&obj);
+ pl_assert(name);
+ return name;
+
+error:
+ lut->error = true;
+ pl_cache_obj_free(&obj);
+ return NULL_IDENT;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 19:57:12 +0000