2025-10-06 14:06:18 +02:00
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2026-03-09 13:17:15 +01:00
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#include "../global.h"
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2026-04-03 13:32:16 +02:00
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// Layout: buffer[channel * 32 + point_index * 2 + 0/1] = x/y of point
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// buffer[128 + channel] = number of points for that channel
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// Channels: 0=C(combined), 1=R, 2=G, 3=B
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// Max 16 points per channel (32 floats / 2 per point)
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static void rgb_curves_init_channel(f32_array_t *val, i32 ch) {
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val->buffer[ch * 32 + 0] = 0.0f;
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val->buffer[ch * 32 + 1] = 0.0f;
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val->buffer[ch * 32 + 2] = 1.0f;
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val->buffer[ch * 32 + 3] = 1.0f;
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val->buffer[128 + ch] = 2.0f;
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}
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char *rgb_curves_node_vector(ui_node_t *node, ui_node_socket_t *socket) {
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char *fac = parser_material_parse_value_input(node->inputs->buffer[0], false);
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char *col = parser_material_parse_vector_input(node->inputs->buffer[1]);
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f32_array_t *curves = node->buttons->buffer[0]->default_value;
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// Initialize default identity curves if counts are unset
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for (i32 ch = 0; ch < 4; ch++) {
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if (curves->buffer[128 + ch] == 0.0f) {
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rgb_curves_init_channel(curves, ch);
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}
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}
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char *name = parser_material_node_name(node, NULL);
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i32 nc = (i32)curves->buffer[128]; // C (combined)
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i32 nr = (i32)curves->buffer[129]; // R
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i32 ng = (i32)curves->buffer[130]; // G
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i32 nb = (i32)curves->buffer[131]; // B
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// Apply C curve to each channel, then per-channel curves
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2026-08-21 22:35:41 +02:00
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char *cr = vector_curves_eval(string_tmp("%s_cr", name), string_tmp("%s.x", col), curves->buffer + 32 * 0, nc);
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char *cg = vector_curves_eval(string_tmp("%s_cg", name), string_tmp("%s.y", col), curves->buffer + 32 * 0, nc);
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char *cb = vector_curves_eval(string_tmp("%s_cb", name), string_tmp("%s.z", col), curves->buffer + 32 * 0, nc);
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char *rr = vector_curves_eval(string_tmp("%s_rr", name), cr, curves->buffer + 32 * 1, nr);
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char *gg = vector_curves_eval(string_tmp("%s_gg", name), cg, curves->buffer + 32 * 2, ng);
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char *bb = vector_curves_eval(string_tmp("%s_bb", name), cb, curves->buffer + 32 * 3, nb);
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2026-04-03 13:32:16 +02:00
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2026-08-21 22:35:41 +02:00
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return string_tmp("lerp3(%s, float3(%s, %s, %s), %s)", col, rr, gg, bb, fac);
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2026-04-03 13:32:16 +02:00
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}
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void nodes_material_rgb_curves_button(i32 node_id) {
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ui_node_t *node = ui_get_node(ui_nodes_get_canvas(true)->nodes, node_id);
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ui_node_button_t *but = node->buttons->buffer[0];
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ui_handle_t *nhandle = ui_nest(ui_handle(__ID__), node->id);
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f32_array_t *val = but->default_value;
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2026-06-08 11:42:44 +02:00
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f32 sw = g_ui->_w / (float)UI_NODES_SCALE();
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2026-04-03 13:32:16 +02:00
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// Channel selector: C, R, G, B
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ui_row4();
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ui_radio(ui_nest(ui_nest(nhandle, 0), 1), 0, "C", "");
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ui_radio(ui_nest(ui_nest(nhandle, 0), 1), 1, "R", "");
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ui_radio(ui_nest(ui_nest(nhandle, 0), 1), 2, "G", "");
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ui_radio(ui_nest(ui_nest(nhandle, 0), 1), 3, "B", "");
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i32 ch = ui_nest(ui_nest(nhandle, 0), 1)->i;
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// Initialize on first use
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if (val->buffer[128 + ch] == 0.0f) {
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rgb_curves_init_channel(val, ch);
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}
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i32 num = (i32)val->buffer[128 + ch];
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// Curve preview
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f32 ph = UI_LINE_H() * 4 - 2 * UI_NODES_SCALE();
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f32 phs = ph * UI_SCALE();
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f32 pws = sw * UI_SCALE();
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2026-06-08 11:42:44 +02:00
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f32 bx = g_ui->_x;
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f32 by = g_ui->_y;
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2026-04-03 13:32:16 +02:00
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// Background
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ui_fill(0, 0, sw, ph, 0xff1a1a1a);
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// Grid lines at midpoints
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ui_fill(0, ph * 0.5f, sw, 1.0f / UI_NODES_SCALE(), 0xff333333);
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ui_fill(sw * 0.5f, 0, 1.0f / UI_NODES_SCALE(), ph, 0xff333333);
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// Draw the curve
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f32 *points = val->buffer + ch * 32;
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draw_set_color(0xffffffff);
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f32 prev_ax = 0.0f, prev_ay = 0.0f;
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for (i32 s = 0; s <= 64; s++) {
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f32 t = (f32)s / 64.0f;
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f32 curve_y = vector_curves_eval_cpu(points, num, t);
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f32 ax = bx + t * pws;
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f32 ay = by + (1.0f - curve_y) * phs;
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if (ay < by)
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ay = by;
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if (ay > by + phs)
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ay = by + phs;
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if (s > 0) {
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draw_line_aa(prev_ax, prev_ay, ax, ay, 1.5f);
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}
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prev_ax = ax;
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prev_ay = ay;
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}
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draw_set_color(0xffffffff);
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2026-06-08 11:42:44 +02:00
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g_ui->_y += UI_LINE_H() * 4;
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2026-04-03 13:32:16 +02:00
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// Edit controls
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2026-08-21 22:35:41 +02:00
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f32_array_t *row = f32_array_create_from_raw_tmp(
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2026-04-03 13:32:16 +02:00
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(f32[]){
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1 / 5.0,
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1 / 5.0,
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3 / 5.0,
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},
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3);
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ui_row(row);
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if (ui_button("+", UI_ALIGN_CENTER, "") && num < 16) {
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i32 last = (num - 1) * 2;
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val->buffer[ch * 32 + num * 2 + 0] = val->buffer[ch * 32 + last + 0];
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val->buffer[ch * 32 + num * 2 + 1] = val->buffer[ch * 32 + last + 1];
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num++;
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val->buffer[128 + ch] = (f32)num;
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}
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if (ui_button("-", UI_ALIGN_CENTER, "") && num > 1) {
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num--;
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val->buffer[128 + ch] = (f32)num;
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}
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ui_handle_t *ihandle = ui_nest(ui_nest(ui_nest(nhandle, 0), 2), ch);
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2026-04-08 12:14:08 +02:00
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i32 i = math_floor(ui_slider(ihandle, "Index", 0, num - 1, false, 1, true, UI_ALIGN_LEFT, true));
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2026-04-03 13:32:16 +02:00
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if (i >= num || i < 0) {
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ihandle->f = i = num - 1;
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}
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ui_row2();
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2026-04-08 12:14:08 +02:00
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ui_handle_t *h1 = ui_nest(ui_nest(nhandle, 0), 3);
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ui_handle_t *h2 = ui_nest(ui_nest(nhandle, 0), 4);
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2026-04-03 13:32:16 +02:00
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h1->f = val->buffer[ch * 32 + i * 2 + 0];
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h2->f = val->buffer[ch * 32 + i * 2 + 1];
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val->buffer[ch * 32 + i * 2 + 0] = ui_slider(h1, "X", 0, 1, true, 100, true, UI_ALIGN_LEFT, true);
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val->buffer[ch * 32 + i * 2 + 1] = ui_slider(h2, "Y", 0, 1, true, 100, true, UI_ALIGN_LEFT, true);
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}
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2026-04-04 21:38:20 +02:00
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void rgb_curves_node_init() {
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2026-04-05 16:09:00 +02:00
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ui_node_t *rgb_curves_node_def =
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2026-08-21 22:35:41 +02:00
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ALLOC_INIT(ui_node_t, {.id = 0,
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2026-08-21 22:40:25 +02:00
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.name = _tr("RGB Curves"),
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.type = "CURVE_RGB",
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.x = 0,
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.y = 0,
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.color = 0xff448c6d,
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.inputs = any_array_create_from_raw(
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(void *[]){
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ALLOC_INIT(ui_node_socket_t, {.id = 0,
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.node_id = 0,
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.name = _tr("Fac"),
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.type = "VALUE",
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.color = 0xffa1a1a1,
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.default_value = f32_array_create_x(1.0),
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.min = 0.0,
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.max = 1.0,
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.precision = 100,
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.display = 0}),
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ALLOC_INIT(ui_node_socket_t, {.id = 0,
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.node_id = 0,
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.name = _tr("Color"),
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.type = "RGBA",
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.color = 0xffc7c729,
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.default_value = f32_array_create_xyzw(1.0, 1.0, 1.0, 1.0),
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.min = 0.0,
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.max = 1.0,
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.precision = 100,
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.display = 0}),
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},
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2),
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.outputs = any_array_create_from_raw(
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(void *[]){
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ALLOC_INIT(ui_node_socket_t, {.id = 0,
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.node_id = 0,
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.name = _tr("Color"),
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.type = "RGBA",
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.color = 0xffc7c729,
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.default_value = f32_array_create_xyzw(1.0, 1.0, 1.0, 1.0),
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.min = 0.0,
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.max = 1.0,
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.precision = 100,
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.display = 0}),
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},
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1),
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.buttons = any_array_create_from_raw(
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(void *[]){
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ALLOC_INIT(ui_node_button_t, {.name = "nodes_material_rgb_curves_button",
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.type = "CUSTOM",
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.output = 0,
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.default_value = f32_array_create(128 + 4),
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.data = NULL,
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.min = 0.0,
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.max = 1.0,
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.precision = 100,
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.height = 7.2}),
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},
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1),
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.width = 0,
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.flags = 0});
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2026-04-04 21:38:20 +02:00
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any_array_push(nodes_material_color, rgb_curves_node_def);
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any_map_set(parser_material_node_vectors, "CURVE_RGB", rgb_curves_node_vector);
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any_map_set(ui_nodes_custom_buttons, "nodes_material_rgb_curves_button", nodes_material_rgb_curves_button);
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}
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