From 717b63369be8e1cd2c24c91e7351526d76896155 Mon Sep 17 00:00:00 2001
From: Antoine C <mixxx@acolombier.dev>
Date: Mon, 15 Jul 2024 13:49:31 +0100
Subject: [PATCH] fix: support for new WaveformData struct in shaders

---
 res/shaders/filteredsignal.frag |  5 +++++
 res/shaders/rgbsignal.frag      | 15 +++++++++++++--
 res/shaders/stackedsignal.frag  |  5 +++++
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/res/shaders/filteredsignal.frag b/res/shaders/filteredsignal.frag
index ce0f0631df7..7a6747b428f 100644
--- a/res/shaders/filteredsignal.frag
+++ b/res/shaders/filteredsignal.frag
@@ -21,6 +21,11 @@ uniform sampler2D waveformDataTexture;
 
 vec4 getWaveformData(float index) {
     vec2 uv_data;
+    // The Waveform data is composed of 8 bytes per sample, (low, mid, high, all,
+    // stem1, stem2, stem3, stem4), see WaveformData struct. Currently, shaders
+    // don't support stem rendering.
+    index = 2 * index;
+
     uv_data.y = floor(index / float(textureStride));
     uv_data.x = floor(index - uv_data.y * float(textureStride));
     // Divide again to convert to normalized UV coordinates.
diff --git a/res/shaders/rgbsignal.frag b/res/shaders/rgbsignal.frag
index f60dd9e3774..718918bd6f2 100644
--- a/res/shaders/rgbsignal.frag
+++ b/res/shaders/rgbsignal.frag
@@ -22,8 +22,19 @@ uniform sampler2D waveformDataTexture;
 
 vec4 getWaveformData(float index) {
     vec2 uv_data;
-    uv_data.y = splitStereoSignal ? floor(index / float(textureStride)) : max(floor(index / float(textureStride)), floor((index + 1) / float(textureStride)));
-    uv_data.x = splitStereoSignal ? floor(index - uv_data.y * float(textureStride)) : max(floor(index - uv_data.y * float(textureStride)), floor((index + 1) - uv_data.y * float(textureStride)));
+    // The Waveform data is composed of 8 bytes per sample, (low, mid, high,
+    // all, stem1, stem2, stem3, stem4), see WaveformData struct. Currently,
+    // shaders don't support stem rendering.
+    index = 2 * index;
+
+    uv_data.y = splitStereoSignal
+            ? floor(index / float(textureStride))
+            : max(floor(index / float(textureStride)),
+                      floor((index + 2) / float(textureStride)));
+    uv_data.x = splitStereoSignal
+            ? floor(index - uv_data.y * float(textureStride))
+            : max(floor(index - uv_data.y * float(textureStride)),
+                      floor((index + 2) - uv_data.y * float(textureStride)));
     // Divide again to convert to normalized UV coordinates.
     return texture2D(waveformDataTexture, uv_data / float(textureStride));
 }
diff --git a/res/shaders/stackedsignal.frag b/res/shaders/stackedsignal.frag
index d5207ac6ef2..1e5bf79d05f 100644
--- a/res/shaders/stackedsignal.frag
+++ b/res/shaders/stackedsignal.frag
@@ -24,6 +24,11 @@ uniform sampler2D waveformDataTexture;
 
 vec4 getWaveformData(float index) {
     vec2 uv_data;
+    // The Waveform data is composed of 8 bytes per sample, (low, mid, high, all,
+    // stem1, stem2, stem3, stem4), see WaveformData struct. Currently, shaders
+    // don't support stem rendering.
+    index = 2 * index;
+
     uv_data.y = floor(index / float(textureStride));
     uv_data.x = floor(index - uv_data.y * float(textureStride));
     // Divide again to convert to normalized UV coordinates.