feat: iBeats

default/forge_project.cfg

@@ -24,6 +24,8 @@
 UNIFORM_TIME=iTime
 # Current tempo
 UNIFORM_TEMPO=iTempo
+# Current total beats 
+UNIFORM_BEATS=iBeats
 
 # --- uniform int ---
 
@@ -103,6 +105,7 @@ IN_2_OUT=2
 # Fragment shaders will be read from the CLI directory as "fragX.glsl"
 # Special shader "frag0.glsl" will be prepend to each one
 
+# Prefix of fragment shaders to detect
 FRAG_FILE_PREFIX=frag
 
 # Total number of fragment shaders (excluding frag0.glsl)

default/frag0.glsl

@@ -8,6 +8,7 @@
 
 uniform float iTime;
 uniform float iTempo;
+uniform float iBeats;
 uniform int iFPS;
 uniform vec2 iResolution;
 uniform vec2 iTexResolution;
@@ -150,7 +151,7 @@ float mean(vec4 v)
 // TIME
 
 float randTime(float seed){
-    return rand(seed + mod(floor(iTime * iTempo / 240), 1000));
+    return rand(seed + floor(iBeats / 4));
 }
 
 float divider(float x)
@@ -166,7 +167,7 @@ float divider(float x)
 
 float modTime(float k, float k2)
 {
-    return mod(divider(k) * iTime * iTempo * k2 / 240, 1);
+    return mod(divider(k) * iBeats * k2 / 4, 1);
 }
 
 float modTime(float k)
@@ -309,8 +310,8 @@ float v_index(vec2 uv) {
 }
 
 vec2 v_pos(float i) {
-    int iTimeId = int(iTime * iTempo / 60);
+    int iTimeId = int(iBeats);
-    float iTimeV = iTime * iTempo / 60 - iTimeId;
+    float iTimeV = iBeats - iTimeId;
 
     float x0 = rand(i + 823 + iTimeId);
     float y0 = rand(i + 328 + iTimeId);
@@ -942,7 +943,7 @@ subroutine(src_stage_sub) vec4 src_2(vec2 vUV, int seed, vec3 b1, vec2 f1, vec3
 
     vec2 uv2 = uv1;
     uv2.y *= cos(uv2.x * 5 * distort);
-    uv2 *= rot(rotation + iTime * iTempo / 960);
+    uv2 *= rot(rotation + iBeats / 16);
     float k = thickness * 2;
     uv2.y = cmod(uv2.y, k * 2 + 0.1);
     float f = step(uv2.y, k * 0.125 + 0.05) * step(-uv2.y, k * 0.125 + 0.01);
@@ -971,7 +972,7 @@ subroutine(src_stage_sub) vec4 src_3(vec2 vUV, int seed, vec3 b1, vec2 f1, vec3
     float k1 = lens_v * 5;
     uv2 = lens(uv2, -k1, k1);
     uv2 = kal(uv2, 5);
-    uv2 *= rot(rotation + iTime * iTempo / 960);
+    uv2 *= rot(rotation + iBeats / 16);
     float k = zoom * 0.1 + 0.05;
     uv2 = cmod(uv2, k * 2);
     float f = step(length(uv2), k / (1 + length(uv1) * 2));
@@ -1002,7 +1003,7 @@ subroutine(src_stage_sub) vec4 src_4(vec2 vUV, int seed, vec3 b1, vec2 f1, vec3
     uv2 = vec2((uv2.x + 1) * 0.5, -uv2.y);
     float m1 = spacing * 4.5 + 0.5;
     float y = log(-uv2.y) * m1;
-    y = mod(y + scroll * 5.0 - iTime * iTempo / 960, 5.);
+    y = mod(y + scroll * 5.0 - iBeats / 16, 5.);
     float id = floor(y) * 32;
     float s = cos(uv2.x * rand(id + 837) * 100 + rand(id + 281) * PI)
                 + cos(uv2.x * rand(id + 231) * 100 + rand(id + 526) * PI)
@@ -1042,7 +1043,7 @@ subroutine(src_stage_sub) vec4 src_5(vec2 vUV, int seed, vec3 b1, vec2 f1, vec3
 
     vec2 uv2 = uv1;
     uv2 *= zoom * 20 + 3;
-    uv2.x += iTime * iTempo / 60;
+    uv2.x += iBeats;
     vec4 data = voronoi(uv2, voronoi_distort);
     float f = data.x / (data.x + data.y);
     f = sin(f * PI * (details * 20)) * 0.5 + 1;
@@ -1078,7 +1079,7 @@ subroutine(src_stage_sub) vec4 src_7(vec2 vUV, int seed, vec3 b1, vec2 f1, vec3
 
     vec2 uv2 = uv1;
     uv2 *= zoom * 20 + 3;
-    uv2 += iTime * iTempo / 60;
+    uv2 += iBeats;
     uv2 = mod(uv2, 100) + 100;
     int start_char = charset_ctrl.x > 0 ? charsets[int(charset.x * CHARSETS) * 2] : 0x01;
     int char_span = int((charset_ctrl.x > 0 ? charsets[int(charset.x * CHARSETS) * 2 + 1] : 255));
@@ -1372,7 +1373,7 @@ subroutine(src_stage_sub) vec4 src_15(vec2 vUV, int seed, vec3 b1, vec2 f1, vec3
     x = 0;
     f += write_5(uv3, vec2(x,13), texts[1]);
     f += write_int(uv3, vec2(x - 3.5,13), int(iTempo), 3);
-    v = modTime(1);
+    v = fract(iBeats);
     f += h_rect(uv3, vec2(x, 12), vec2(4, 0.5), 0.2);
     f += rect(uv3, vec2(x + 4 * v - 4, 12), vec2(4 * v, 0.4));
 

src/forge.c

@@ -214,6 +214,7 @@ static void loop(bool hr, bool trace_fps) {
   compute_fps(trace_fps);
 
   context->time = window_get_time();
+  context->tempo_total = (float)tempo_total(context->tempo);
 
   if (window_output != NULL) {
     window_use(window_output, context);

src/shaders.c

@@ -3,12 +3,14 @@
 #include <stddef.h>
 #include <stdio.h>
 
+#include "types.h"
+
 #include "arr.h"
 #include "config.h"
 #include "config_file.h"
 #include "constants.h"
 #include "shaders.h"
-#include "types.h"
+#include "tempo.h"
 
 #define GLAD_GL_IMPLEMENTATION
 #include <glad/gl.h>
@@ -252,6 +254,9 @@ static void init_single_program(ShaderProgram *program, unsigned int i,
   program->itempo_locations[i] = glGetUniformLocation(
       program->programs[i],
       config_file_get_str(config, "UNIFORM_TEMPO", "iTempo"));
+  program->ibeats_locations[i] = glGetUniformLocation(
+      program->programs[i],
+      config_file_get_str(config, "UNIFORM_BEATS", "iBeats"));
   program->ifps_locations[i] = glGetUniformLocation(
       program->programs[i], config_file_get_str(config, "UNIFORM_FPS", "iFPS"));
   program->ires_locations[i] = glGetUniformLocation(
@@ -507,6 +512,7 @@ static void use_program(ShaderProgram program, int i, bool output,
   // set fragment uniforms
   write_uniform_1f(program.itime_locations[i], context->time);
   write_uniform_1f(program.itempo_locations[i], context->tempo.tempo);
+  write_uniform_1f(program.ibeats_locations[i], context->tempo_total);
   write_uniform_1i(program.ifps_locations[i], context->fps);
   write_uniform_1i(program.idemo_locations[i], context->demo ? 1 : 0);
   write_uniform_1i(program.ipage_locations[i], context->page);

src/tempo.c

@@ -3,7 +3,6 @@
 #include <sys/time.h>
 
 #include "config.h"
-#include "log.h"
 #include "tempo.h"
 
 static long now() {
@@ -112,11 +111,14 @@ void tempo_tap(Tempo *tempo) {
   add_tap_to_chain(tempo, t);
 }
 
-double tempo_progress(Tempo tempo, double modulo) {
+double tempo_total(Tempo tempo) {
   long t;
 
   t = now();
 
-  return fmod((double)(t - tempo.last_reset) / (double)tempo.beat_length,
+  return (double)(t - tempo.last_reset) / (double)tempo.beat_length;
-              modulo);
+}
+
+double tempo_progress(Tempo tempo, double modulo) {
+  return fmod(tempo_total(tempo), modulo);
 }

src/tempo.h

@@ -9,6 +9,8 @@ void tempo_tap(Tempo *tempo);
 
 void tempo_set(Tempo *tempo, float value);
 
+double tempo_total(Tempo tempo);
+
 double tempo_progress(Tempo tempo, double modulo);
 
 #endif /* TEMPO_H */

src/types.h

@@ -88,6 +88,7 @@ typedef struct ShaderProgram {
 
   GLuint itime_locations[ARRAY_SIZE];
   GLuint itempo_locations[ARRAY_SIZE];
+  GLuint ibeats_locations[ARRAY_SIZE];
   GLuint ifps_locations[ARRAY_SIZE];
   GLuint ires_locations[ARRAY_SIZE];
   GLuint itexres_locations[ARRAY_SIZE];
@@ -157,6 +158,7 @@ typedef struct SharedContext {
   double time;
   unsigned int fps;
   Tempo tempo;
+  double tempo_total;
   UintArray state;
   unsigned int page;
   unsigned int selected;