From 5d95c7132c9285f57b48b4deb3808e9cce291660 Mon Sep 17 00:00:00 2001
From: Lukas Rusak <lorusak@gmail.com>
Date: Fri, 21 Apr 2023 10:41:10 -0700
Subject: [PATCH] CVisualizationShadertoy: use vao

Signed-off-by: Lukas Rusak <lorusak@gmail.com>
---
 src/main.cpp | 11 +++++++++++
 src/main.h   |  1 +
 2 files changed, 12 insertions(+)

diff --git a/src/main.cpp b/src/main.cpp
index ec9e1fe..2db9bdb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -154,6 +154,8 @@ void CVisualizationShadertoy::Render()
 {
   if (m_initialized)
   {
+    glBindVertexArray(m_state.vao);
+
     if (m_state.fbwidth && m_state.fbheight)
     {
       RenderTo(m_shadertoyShader.ProgramHandle(), m_state.effect_fb);
@@ -163,6 +165,8 @@ void CVisualizationShadertoy::Render()
     {
       RenderTo(m_shadertoyShader.ProgramHandle(), 0);
     }
+
+    glBindVertexArray(0);
   }
 }
 
@@ -180,11 +184,16 @@ bool CVisualizationShadertoy::Start(int iChannels, int iSamplesPerSec, int iBits
     -1.0,-1.0, 1.0, 1.0,
   };
 
+  glGenVertexArrays(1, &m_state.vao);
+  glBindVertexArray(m_state.vao);
+
   // Upload vertex data to a buffer
   glGenBuffers(1, &m_state.vertex_buffer);
   glBindBuffer(GL_ARRAY_BUFFER, m_state.vertex_buffer);
   glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_data), vertex_data, GL_STATIC_DRAW);
 
+  glBindVertexArray(0);
+
   m_samplesPerSec = iSamplesPerSec;
   Launch(m_currentPreset);
   m_initialized = true;
@@ -203,6 +212,8 @@ void CVisualizationShadertoy::Stop()
   UnloadTextures();
 
   glDeleteBuffers(1, &m_state.vertex_buffer);
+
+  glDeleteVertexArrays(1, &m_state.vao);
 }
 
 
diff --git a/src/main.h b/src/main.h
index 61a0db9..195ac5b 100644
--- a/src/main.h
+++ b/src/main.h
@@ -81,6 +81,7 @@ class ATTR_DLL_LOCAL CVisualizationShadertoy
 
   struct
   {
+    GLuint vao;
     GLuint vertex_buffer;
     GLuint attr_vertex_e;
     GLuint attr_vertex_r, uTexture;