From d3f4d3285d1be8a6445bae43827961c44880033b Mon Sep 17 00:00:00 2001
From: Christoph Helma <helma@in-silico.ch>
Date: Thu, 15 Feb 2018 18:33:39 +0100
Subject: note switching

---
 shader.frag | 38 ++++++++++----------------------
 sv.c        | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++----------
 2 files changed, 72 insertions(+), 39 deletions(-)

diff --git a/shader.frag b/shader.frag
index 0141563..4bb6810 100644
--- a/shader.frag
+++ b/shader.frag
@@ -10,7 +10,9 @@ uniform int program;
 uniform sampler2D images[4];
 layout (binding = 0,rgba32f) uniform image2D backbuffer;
 uniform float ratios[4];
-uniform float params[32];
+uniform int idx[2];
+uniform float vel[2];
+uniform float params[4];
 
 out vec4 fragColor;
 
@@ -18,34 +20,16 @@ float random (in float x) {
   return fract(sin(x)*43758.5453123)-0.5;
 }
 
-vec4 img(int i) {
+vec2 coordinates(int i) {
 	vec2 st = gl_FragCoord.xy/resolution.xy;
-  st.x *= ratios[i];
-  st.x += (1-ratios[i])*0.5;
-  st.x += 0.5;
-  return texture2D(images[i],st);
+  return st;
 }
 
 void main (void) {
-    vec4 image = img(0);
-  if (program == 0) {
-    image = img(2);
-    image.rg = image.gr;
-    image = 1.5*image;
-    }
-  /*
-  else {
-    ivec2 P = ivec2(gl_FragCoord.xy);
-    vec4 buf = imageLoad(backbuffer,P);
-    vec4 img1 = mix(img(0),img(1),sin(ticks));
-    vec4 img2 = mix(img(2),img(3),cos(ticks));
-    buf.bg = buf.gr;
-    //buf.b = 0.0;
-    vec4 i = mix(img1,img2,0.5);
-    //P = ivec2(gl_FragCoord.xy);
-    imageStore(backbuffer,P,i);
-    image = mix(i,buf,0.8);
-    }
-    */
-  fragColor = image;
+  vec4 img;
+  vec2 st = coordinates(idx[0]);
+  img = texture2D(images[idx[0]],st);
+  st = coordinates(idx[1]);
+  img = pow(img, texture2D(images[idx[1]],st));
+  fragColor = img;
 }
diff --git a/sv.c b/sv.c
index de792f0..338509d 100644
--- a/sv.c
+++ b/sv.c
@@ -48,7 +48,7 @@ typedef struct Param {
   int new;
 } Parameter;
 
-Parameter parameters[32];
+Parameter parameters[4];
 
 static snd_seq_t *seq_handle;
 static int in_port;
@@ -180,10 +180,10 @@ void readImage(int i) {
   glBindTexture(GL_TEXTURE_2D,images[i].id);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-  //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
-  //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+  //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
+  //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
   stbi_image_free(pixels);
 }
@@ -200,7 +200,7 @@ void updateImages(int force) {
 
 void updateParams(int force) {
   glUniform1i(glGetUniformLocation(shader.id, "bars"), bars);
-  for (int i = 0; i<32; i++) {
+  for (int i = 0; i<4; i++) {
     if (parameters[i].new || force) {
       glUniform1f(glGetUniformLocation(shader.id, "params")+i, parameters[i].value);
       parameters[i].new = 0;
@@ -210,8 +210,8 @@ void updateParams(int force) {
 
 int ticks =0;
 int running = 0;
-int note = 0;
-int vel = 0;
+int idx[2] = {0,1};
+float vel[2] = {0,0};
 
 void *readMidi() {
   midi_open();
@@ -219,11 +219,56 @@ void *readMidi() {
     snd_seq_event_t *ev = NULL;
     snd_seq_event_input(seq_handle, &ev);
     if (ev->type == SND_SEQ_EVENT_NOTEON) {
-      note = ev->data.note.note;
-      vel = ev->data.note.velocity;
+      int note = ev->data.note.note;
+      int v = ev->data.note.velocity;
+      int i,j;
+      if (note < 48) {
+        i = 0;
+        j = note-36;
+      }
+      else {
+        i = 1;
+        j = note-48;
+      }
+      // only white keys
+      if (j == 0) {
+        idx[i] = 0; vel[i] = (float)v/127.0;
+      }
+      else if (j == 2) {
+        idx[i] = 1; vel[i] = (float)v/127.0;
+      }
+      else if (j == 4) {
+        idx[i] = 2; vel[i] = (float)v/127.0;
+      }
+      else if (j == 5) {
+        idx[i] = 3; vel[i] = (float)v/127.0;
+      }
+      
     }
     else if (ev->type == SND_SEQ_EVENT_NOTEOFF) {
-      vel = 0;
+      int note = ev->data.note.note;
+      int i,j;
+      if (note < 48) {
+        i = 0;
+        j = note-36;
+      }
+      else {
+        i = 1;
+        j = note-48;
+      }
+      // only white keys
+      if (j == 0) {
+        idx[i] = 0; vel[i] = 0;
+      }
+      else if (j == 2) {
+        idx[i] = 1; vel[i] = 0;
+      }
+      else if (j == 4) {
+        idx[i] = 2; vel[i] = 0;
+      }
+      else if (j == 5) {
+        idx[i] = 3; vel[i] = 0;
+      }
     }
     else if(ev->type == SND_SEQ_EVENT_CONTROLLER)
         printf("[%d] Control:  %2x val(%2x)\n", ev->time.tick,
@@ -318,7 +363,11 @@ int main(int argc, char **argv) {
     //glUniform1f(glGetUniformLocation(shader.id, "time"),glfwGetTime());
     glUniform1f(glGetUniformLocation(shader.id, "ticks"),(float)ticks);
     //printf("%i\n",note);
-    glUniform1i(glGetUniformLocation(shader.id, "program"),note-36);
+    //glUniform1i(glGetUniformLocation(shader.id, "program"),note-36);
+    for (int i = 0; i<2; i++) { 
+      glUniform1i(glGetUniformLocation(shader.id, "idx")+i,idx[i]);
+      glUniform1f(glGetUniformLocation(shader.id, "vel")+i,vel[i]);
+      }
     if (shader.new) {
       createShader();
       glUniform2f(glGetUniformLocation(shader.id, "resolution"),width,height); // important!!
-- 
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