diff --git a/src/config.c b/src/config.c
index 46f935f7e..20981885a 100644
--- a/src/config.c
+++ b/src/config.c
@@ -1725,11 +1725,15 @@ load_gl3_shaders(void)
     ini_section_t cat = ini_find_section(config, "GL3 Shaders");
     char         *p;
     char          temp[512];
-    int           i = 0;
+    int           i = 0, shaders = 0;
     memset(temp, 0, sizeof(temp));
     memset(gl3_shader_file, 0, sizeof(gl3_shader_file));
 
-    for (int i = 0; i < MAX_USER_SHADERS; i++) {
+    shaders = ini_section_get_int(cat, "shaders", 0);
+    if (shaders > MAX_USER_SHADERS)
+        shaders = MAX_USER_SHADERS;
+
+    for (int i = 0; i < shaders; i++) {
         temp[0] = 0;
         snprintf(temp, 512, "shader%d", i);
         p = ini_section_get_string(cat, temp, "");
@@ -2670,8 +2674,12 @@ save_gl3_shaders(void)
     int shaders = 0, i = 0;
 
     for (i = 0; i < MAX_USER_SHADERS; i++) {
-        if (gl3_shader_file[i][0] == 0)
+        if (gl3_shader_file[i][0] == 0) {
+            temp[0] = 0;
+            snprintf(temp, 512, "shader%d", i);
+            ini_section_delete_var(cat, temp);
             break;
+        }
         shaders++;
     }
 
diff --git a/src/include/86box/ini.h b/src/include/86box/ini.h
index 2ce89f788..3139f410e 100644
--- a/src/include/86box/ini.h
+++ b/src/include/86box/ini.h
@@ -31,6 +31,7 @@ typedef void *ini_section_t;
 
 extern ini_t ini_new(void);
 extern ini_t ini_read(const char *fn);
+extern void  ini_strip_quotes(ini_t ini);
 extern void  ini_write(ini_t ini, const char *fn);
 extern void  ini_dump(ini_t ini);
 extern void  ini_close(ini_t ini);
@@ -91,7 +92,7 @@ extern ini_section_t ini_find_or_create_section(ini_t ini, const char *name);
 extern void          ini_rename_section(ini_section_t section, const char *name);
 extern void          ini_delete_section_if_empty(ini_t ini, ini_section_t section);
 
-static inline void *wx_config_load(const char *path) { return (void*) ini_read(path); }
+static inline void *wx_config_load(const char *path) { ini_t ini = ini_read(path); if (ini) ini_strip_quotes(ini); return (void*)ini; }
 static inline int wx_config_get_string(void *config, const char *name, char *dst, int size, const char *defVal) {
     int res = ini_has_entry(ini_find_or_create_section((ini_t)config, ""), name);
     char* str = ini_get_string((ini_t)config, "", name, (char*)defVal);
diff --git a/src/ini.c b/src/ini.c
index 4ea6f6381..b4c905489 100644
--- a/src/ini.c
+++ b/src/ini.c
@@ -254,9 +254,8 @@ ini_delete_section_if_empty(ini_t ini, ini_section_t section)
 static section_t *
 create_section(list_t *head, const char *name)
 {
-    section_t *ns = malloc(sizeof(section_t));
+    section_t *ns = calloc(1, sizeof(section_t));
 
-    memset(ns, 0x00, sizeof(section_t));
     memcpy(ns->name, name, strlen(name) + 1);
     list_add(&ns->list, head);
 
@@ -279,9 +278,8 @@ ini_find_or_create_section(ini_t ini, const char *name)
 static entry_t *
 create_entry(section_t *section, const char *name)
 {
-    entry_t *ne = malloc(sizeof(entry_t));
+    entry_t *ne = calloc(1, sizeof(entry_t));
 
-    memset(ne, 0x00, sizeof(entry_t));
     memcpy(ne->name, name, strlen(name) + 1);
     list_add(&ne->list, &section->entry_head);
 
@@ -390,11 +388,8 @@ ini_read(const char *fn)
     if (fp == NULL)
         return NULL;
 
-    head = malloc(sizeof(list_t));
-    memset(head, 0x00, sizeof(list_t));
-
-    sec = malloc(sizeof(section_t));
-    memset(sec, 0x00, sizeof(section_t));
+    head = calloc(1, sizeof(list_t));
+    sec = calloc(1, sizeof(section_t));
 
     list_add(&sec->list, head);
     if (bom)
@@ -475,7 +470,7 @@ ini_read(const char *fn)
         d = c;
 
         /* Allocate a new variable entry.. */
-        ne = malloc(sizeof(entry_t));
+        ne = calloc(1, sizeof(entry_t));
         memset(ne, 0x00, sizeof(entry_t));
         memcpy(ne->name, ename, 128);
         wcsncpy(ne->wdata, &buff[d], sizeof_w(ne->wdata) - 1);
@@ -551,6 +546,43 @@ ini_write(ini_t ini, const char *fn)
     (void) fclose(fp);
 }
 
+void
+ini_strip_quotes(ini_t ini)
+{
+    list_t    *list = (list_t *) ini;
+    section_t *sec;
+
+    sec = (section_t *) list->next;
+
+    while (sec != NULL) {
+        entry_t *ent;
+
+        ent = (entry_t *) sec->entry_head.next;
+        while (ent != NULL) {
+            if (ent->name[0] != '\0') {
+                int i = 0;
+                if (ent->wdata[0] == L'\"') {
+                    memmove(ent->wdata, &ent->wdata[1], sizeof(ent->wdata) - sizeof(wchar_t));
+                }
+                if (ent->wdata[wcslen(ent->wdata) - 1] == L'\"') {
+                    ent->wdata[wcslen(ent->wdata) - 1] = 0;
+                }
+
+                if (ent->data[0] == '\"') {
+                    memmove(ent->data, &ent->data[1], sizeof(ent->data) - sizeof(char));
+                }
+                if (ent->data[strlen(ent->data) - 1] == '\"') {
+                    ent->data[strlen(ent->data) - 1] = 0;
+                }
+            }
+
+            ent = (entry_t *) ent->list.next;
+        }
+
+        sec = (section_t *) sec->list.next;
+    }
+}
+
 ini_t
 ini_new(void)
 {
diff --git a/src/qt/CMakeLists.txt b/src/qt/CMakeLists.txt
index 8a06cbe5a..574aae7b7 100644
--- a/src/qt/CMakeLists.txt
+++ b/src/qt/CMakeLists.txt
@@ -197,6 +197,7 @@ add_library(ui STATIC
     qt_openglshadermanagerdialog.hpp
     qt_openglshadermanagerdialog.cpp
     qt_openglshadermanagerdialog.ui
+    qt_openglshaderconfig.hpp qt_openglshaderconfig.cpp qt_openglshaderconfig.ui
 )
 
 if(RTMIDI)
diff --git a/src/qt/qt_glsl_parser.cpp b/src/qt/qt_glsl_parser.cpp
index b1a96a312..f43897506 100644
--- a/src/qt/qt_glsl_parser.cpp
+++ b/src/qt/qt_glsl_parser.cpp
@@ -255,6 +255,8 @@ glslp_t *glslp_parse(const char *f) {
                         safe_strncpy(s, t + j, sublen);
                         s[511 < sublen ? 511 : sublen] = 0;
 
+                        if (s[strlen(s) - 1] == ';') s[strlen(s) - 1] = 0;
+
                         struct texture *tex = &glslp->textures[glslp->num_textures++];
 
                         strcpy(tex->name, s);
diff --git a/src/qt/qt_mainwindow.cpp b/src/qt/qt_mainwindow.cpp
index 60e0494fc..7e0cecdeb 100644
--- a/src/qt/qt_mainwindow.cpp
+++ b/src/qt/qt_mainwindow.cpp
@@ -1982,6 +1982,12 @@ MainWindow::changeEvent(QEvent *event)
     }
 }
 
+void
+MainWindow::reloadAllRenderers()
+{
+    reload_renderers = true;
+}
+
 void
 MainWindow::on_actionRenderer_options_triggered()
 {
@@ -2000,6 +2006,16 @@ MainWindow::on_actionRenderer_options_triggered()
                 if (renderers[i] && renderers[i]->hasOptions())
                     renderers[i]->reloadOptions();
             }
+        } else if (reload_renderers && ui->stackedWidget->reloadRendererOption()) {
+            reload_renderers = false;
+            ui->stackedWidget->switchRenderer(static_cast<RendererStack::Renderer>(vid_api));
+            if (show_second_monitors) {
+                for (int i = 1; i < MONITORS_NUM; i++) {
+                    if (renderers[i] && renderers[i]->reloadRendererOption() && renderers[i]->hasOptions()) {
+                        ui->stackedWidget->switchRenderer(static_cast<RendererStack::Renderer>(vid_api));
+                    }
+                }
+            }
         }
     }
 }
diff --git a/src/qt/qt_mainwindow.hpp b/src/qt/qt_mainwindow.hpp
index 25e33d77c..dced698bb 100644
--- a/src/qt/qt_mainwindow.hpp
+++ b/src/qt/qt_mainwindow.hpp
@@ -32,6 +32,7 @@ public:
     QSize getRenderWidgetSize();
     void  setSendKeyboardInput(bool enabled);
     void  checkFullscreenHotkey();
+    void  reloadAllRenderers();
 
     std::array<std::unique_ptr<RendererStack>, 8> renderers;
 signals:
@@ -173,6 +174,9 @@ private:
     bool fs_on_signal        = false;
     bool fs_off_signal       = false;
 
+    /* Reload the renderers after closing renderer options dialog. */
+    bool reload_renderers    = false;
+
     friend class SpecifyDimensions;
     friend class ProgSettings;
     friend class RendererCommon;
diff --git a/src/qt/qt_openglshaderconfig.cpp b/src/qt/qt_openglshaderconfig.cpp
new file mode 100644
index 000000000..25f9d38a8
--- /dev/null
+++ b/src/qt/qt_openglshaderconfig.cpp
@@ -0,0 +1,85 @@
+#include "qt_openglshaderconfig.hpp"
+#include "ui_qt_openglshaderconfig.h"
+
+#include "qt_mainwindow.hpp"
+
+extern MainWindow* main_window;
+
+extern "C"
+{
+#include <86box/86box.h>
+#include <86box/plat.h>
+#include <86box/config.h>
+}
+
+OpenGLShaderConfig::OpenGLShaderConfig(QWidget *parent, glslp_t* shader)
+    : QDialog(parent)
+    , ui(new Ui::OpenGLShaderConfig)
+{
+    ui->setupUi(this);
+
+    currentShader = shader;
+
+    connect(ui->buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
+    connect(ui->buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
+
+    glslp_read_shader_config(currentShader);
+
+    for (int i = 0; i < currentShader->num_parameters; i++) {
+        auto spinBox = new QDoubleSpinBox;
+        spinBox->setObjectName(currentShader->parameters[i].id);
+        spinBox->setRange(currentShader->parameters[i].min, currentShader->parameters[i].max);
+        spinBox->setValue(currentShader->parameters[i].value);
+        spinBox->setSingleStep(currentShader->parameters[i].step);
+        QFormLayout* layout = (QFormLayout*)ui->scrollAreaWidgetContents->layout();
+        layout->addRow(currentShader->parameters[i].description, spinBox);
+    }
+}
+
+OpenGLShaderConfig::~OpenGLShaderConfig()
+{
+    delete ui;
+}
+
+void OpenGLShaderConfig::on_buttonBox_clicked(QAbstractButton *button)
+{
+    if (ui->buttonBox->buttonRole(button) == QDialogButtonBox::ResetRole) {
+        for (int i = 0; i < currentShader->num_parameters; i++) {
+            QDoubleSpinBox* box = this->findChild<QDoubleSpinBox*>(QString(currentShader->parameters[i].id));
+            if (box) {
+                box->setValue(currentShader->parameters[i].default_value);
+            }
+        }
+    } else if (ui->buttonBox->buttonRole(button) == QDialogButtonBox::ApplyRole) {
+        startblit();
+        for (int i = 0; i < currentShader->num_parameters; i++) {
+            QDoubleSpinBox* box = this->findChild<QDoubleSpinBox*>(QString(currentShader->parameters[i].id));
+            if (box) {
+                float val = (float)box->value();
+                currentShader->parameters[i].value = val;
+            }
+        }
+        glslp_write_shader_config(currentShader);
+        config_save();
+        endblit();
+        main_window->reloadAllRenderers();
+    }
+}
+
+
+void OpenGLShaderConfig::on_OpenGLShaderConfig_accepted()
+{
+    startblit();
+    for (int i = 0; i < currentShader->num_parameters; i++) {
+        QDoubleSpinBox* box = (QDoubleSpinBox*)this->findChild<QDoubleSpinBox*>(QString(currentShader->parameters[i].id));
+        if (box) {
+            float val = (float)box->value();
+            currentShader->parameters[i].value = val;
+        }
+    }
+    glslp_write_shader_config(currentShader);
+    config_save();
+    endblit();
+    main_window->reloadAllRenderers();
+}
+
diff --git a/src/qt/qt_openglshaderconfig.hpp b/src/qt/qt_openglshaderconfig.hpp
new file mode 100644
index 000000000..f71299d38
--- /dev/null
+++ b/src/qt/qt_openglshaderconfig.hpp
@@ -0,0 +1,40 @@
+#ifndef QT_OPENGLSHADERCONFIG_HPP
+#define QT_OPENGLSHADERCONFIG_HPP
+
+#include <QDialog>
+#include <QLabel>
+#include <QDoubleSpinBox>
+#include <QAbstractButton>
+
+#include <map>
+#include <string>
+
+extern "C"
+{
+#include <86box/qt-glslp-parser.h>
+}
+
+namespace Ui {
+class OpenGLShaderConfig;
+}
+
+class OpenGLShaderConfig : public QDialog {
+    Q_OBJECT
+
+public:
+    explicit OpenGLShaderConfig(QWidget *parent = nullptr, glslp_t* shader = nullptr);
+    ~OpenGLShaderConfig();
+
+private slots:
+    void on_buttonBox_clicked(QAbstractButton *button);
+
+    void on_OpenGLShaderConfig_accepted();
+
+private:
+    Ui::OpenGLShaderConfig *ui;
+    glslp_t* currentShader;
+
+    std::map<std::string, double> defaultValues;
+};
+
+#endif // QT_OPENGLSHADERCONFIG_HPP
diff --git a/src/qt/qt_openglshaderconfig.ui b/src/qt/qt_openglshaderconfig.ui
new file mode 100644
index 000000000..1aebdb6f6
--- /dev/null
+++ b/src/qt/qt_openglshaderconfig.ui
@@ -0,0 +1,92 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>OpenGLShaderConfig</class>
+ <widget class="QDialog" name="OpenGLShaderConfig">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Shader Configuration</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="sizeConstraint">
+    <enum>QLayout::SizeConstraint::SetMinAndMaxSize</enum>
+   </property>
+   <item>
+    <widget class="QScrollArea" name="scrollArea">
+     <property name="widgetResizable">
+      <bool>true</bool>
+     </property>
+     <widget class="QWidget" name="scrollAreaWidgetContents">
+      <property name="geometry">
+       <rect>
+        <x>0</x>
+        <y>0</y>
+        <width>380</width>
+        <height>250</height>
+       </rect>
+      </property>
+      <layout class="QFormLayout" name="formLayout_2">
+       <property name="sizeConstraint">
+        <enum>QLayout::SizeConstraint::SetMaximumSize</enum>
+       </property>
+       <property name="fieldGrowthPolicy">
+        <enum>QFormLayout::FieldGrowthPolicy::AllNonFixedFieldsGrow</enum>
+       </property>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Orientation::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::StandardButton::Apply|QDialogButtonBox::StandardButton::Cancel|QDialogButtonBox::StandardButton::Ok|QDialogButtonBox::StandardButton::Reset</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>OpenGLShaderConfig</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>OpenGLShaderConfig</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>
diff --git a/src/qt/qt_openglshadermanagerdialog.cpp b/src/qt/qt_openglshadermanagerdialog.cpp
index 26f206a0e..08cf94fd7 100644
--- a/src/qt/qt_openglshadermanagerdialog.cpp
+++ b/src/qt/qt_openglshadermanagerdialog.cpp
@@ -1,6 +1,8 @@
 #include "qt_openglshadermanagerdialog.hpp"
 #include "ui_qt_openglshadermanagerdialog.h"
 
+#include "qt_openglshaderconfig.hpp"
+
 #include <QListWidgetItem>
 #include <QFileDialog>
 #include <QMessageBox>
@@ -39,10 +41,21 @@ OpenGLShaderManagerDialog::OpenGLShaderManagerDialog(QWidget *parent)
     }
     if (ui->shaderListWidget->count()) {
         ui->shaderListWidget->setCurrentRow(ui->shaderListWidget->count() - 1);
+        auto current = ui->shaderListWidget->currentItem();
+        if (current) {
+            glslp_t* shader = (glslp_t*)current->data(Qt::UserRole + 2).toULongLong();
+            if (shader->num_parameters > 0)
+                ui->buttonConfigure->setEnabled(true);
+            else
+                ui->buttonConfigure->setEnabled(false);
+        } else {
+            ui->buttonConfigure->setEnabled(false);
+        }
     } else {
         ui->buttonRemove->setDisabled(true);
         ui->buttonMoveUp->setDisabled(true);
         ui->buttonMoveDown->setDisabled(true);
+        ui->buttonConfigure->setDisabled(true);
     }
 }
 
@@ -84,9 +97,16 @@ void OpenGLShaderManagerDialog::on_shaderListWidget_currentItemChanged(QListWidg
         ui->buttonRemove->setDisabled(true);
         ui->buttonMoveUp->setDisabled(true);
         ui->buttonMoveDown->setDisabled(true);
+        ui->buttonConfigure->setDisabled(true);
         return;
     } else {
         ui->buttonRemove->setDisabled(false);
+        ui->buttonConfigure->setDisabled(true);
+        if (current) {
+            glslp_t* shader = (glslp_t*)current->data(Qt::UserRole + 2).toULongLong();
+            if (shader->num_parameters > 0)
+                ui->buttonConfigure->setEnabled(true);
+        }
     }
     ui->buttonMoveUp->setDisabled(ui->shaderListWidget->currentRow() == 0);
     ui->buttonMoveDown->setDisabled(ui->shaderListWidget->currentRow() == (ui->shaderListWidget->count() - 1));
@@ -95,6 +115,22 @@ void OpenGLShaderManagerDialog::on_shaderListWidget_currentItemChanged(QListWidg
 
 void OpenGLShaderManagerDialog::on_shaderListWidget_currentRowChanged(int currentRow)
 {
+    auto current = ui->shaderListWidget->currentItem();
+    if (current == nullptr) {
+        ui->buttonRemove->setDisabled(true);
+        ui->buttonMoveUp->setDisabled(true);
+        ui->buttonMoveDown->setDisabled(true);
+        ui->buttonConfigure->setDisabled(true);
+        return;
+    } else {
+        ui->buttonRemove->setDisabled(false);
+        ui->buttonConfigure->setDisabled(true);
+        if (current) {
+            glslp_t* shader = (glslp_t*)current->data(Qt::UserRole + 2).toULongLong();
+            if (shader->num_parameters > 0)
+                ui->buttonConfigure->setEnabled(true);
+        }
+    }
     ui->buttonMoveUp->setDisabled(ui->shaderListWidget->currentRow() == 0);
     ui->buttonMoveDown->setDisabled(ui->shaderListWidget->currentRow() == (ui->shaderListWidget->count() - 1));
 }
@@ -143,6 +179,8 @@ void OpenGLShaderManagerDialog::on_buttonRemove_clicked()
             glslp_free((glslp_t*)item->data(Qt::UserRole + 2).toULongLong());
         }
         delete item;
+
+        on_shaderListWidget_currentRowChanged(ui->shaderListWidget->currentRow());
     }
 }
 
@@ -157,3 +195,15 @@ void OpenGLShaderManagerDialog::on_OpenGLShaderManagerDialog_accepted()
     endblit();
 }
 
+
+void OpenGLShaderManagerDialog::on_buttonConfigure_clicked()
+{
+    auto item = ui->shaderListWidget->currentItem();
+    if (item) {
+        glslp_t* shader = (glslp_t*)item->data(Qt::UserRole + 2).toULongLong();
+
+        auto configDialog = new OpenGLShaderConfig(this, shader);
+        configDialog->exec();
+    }
+}
+
diff --git a/src/qt/qt_openglshadermanagerdialog.hpp b/src/qt/qt_openglshadermanagerdialog.hpp
index bac0205cf..b8885e3a3 100644
--- a/src/qt/qt_openglshadermanagerdialog.hpp
+++ b/src/qt/qt_openglshadermanagerdialog.hpp
@@ -33,6 +33,8 @@ private slots:
 
     void on_OpenGLShaderManagerDialog_accepted();
 
+    void on_buttonConfigure_clicked();
+
 private:
     Ui::OpenGLShaderManagerDialog *ui;
 };
diff --git a/src/qt/qt_openglshadermanagerdialog.ui b/src/qt/qt_openglshadermanagerdialog.ui
index 2888e106f..f68827436 100644
--- a/src/qt/qt_openglshadermanagerdialog.ui
+++ b/src/qt/qt_openglshadermanagerdialog.ui
@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Dialog</string>
+   <string>Shader Manager</string>
   </property>
   <layout class="QHBoxLayout" name="horizontalLayout">
    <property name="sizeConstraint">
@@ -59,7 +59,7 @@
      <item>
       <widget class="QPushButton" name="buttonConfigure">
        <property name="enabled">
-        <bool>false</bool>
+        <bool>true</bool>
        </property>
        <property name="text">
         <string>Configure</string>