Added GLX window creation backend, addresses #18

Makefile

@@ -38,20 +38,30 @@ ifeq ($(INSTALL),unix)
     endif
 endif
 
+ifndef DISABLE_GLFW
+    CFLAGS_GLFW = -DGLAVA_GLFW
+    LDFLAGS_GLFW = -lglfw
+endif
+
+ifndef DISABLE_GLX
+    CFLAGS_GLX = -DGLAVA_GLX
+    LDFLAGS_GLX = -lGLX -lXrender
+endif
+
 ifeq ($(INSTALL),osx)
     CFLAGS_INSTALL = -DGLAVA_OSX
     SHADER_DIR = Library/glava
 endif
 
-LDFLAGS = $(ASAN) -lpulse -lpulse-simple -pthread -lglfw -ldl -lm -lX11 -lXext -lXcomposite
+LDFLAGS = $(ASAN) -lpulse -lpulse-simple -pthread $(LDFLAGS_GLFW) -ldl -lm -lX11 -lXext $(LDFLAGS_GLX)
 
 PYTHON = python
 
 GLAD_INSTALL_DIR = glad
 GLAD_SRCFILE = ./glad/src/glad.c
 GLAD_ARGS = --generator=$(GLAD_GEN) --extensions=GL_EXT_framebuffer_multisample,GL_EXT_texture_filter_anisotropic
-CFLAGS_COMMON = -DGLAVA_GLFW -DGLAVA_GLX -I glad/include
+CFLAGS_COMMON = -I glad/include
-CFLAGS_USE = $(CFLAGS_COMMON) $(CFLAGS_BUILD) $(CFLAGS_INSTALL) $(CFLAGS)
+CFLAGS_USE = $(CFLAGS_COMMON) $(CFLAGS_GLX) $(CFLAGS_GLFW) $(CFLAGS_BUILD) $(CFLAGS_INSTALL) $(CFLAGS)
 
 all: glava
 

README.md

@@ -19,7 +19,7 @@ You can pass `BUILD=debug` to the makefile for debug builds of both glad and gla
 
 - X11
 - PulseAudio
-- GLFW 3.1+
+- GLFW 3.1+ (optional, disable with `DISABLE_GLFW=1`)
 - Linux or BSD
 
 **Additional compile time requirements:**
@@ -27,8 +27,9 @@ You can pass `BUILD=debug` to the makefile for debug builds of both glad and gla
 - glad (included as a submodule)
 - python (required to generate bindings with glad)
 - GCC (this program uses GNU C features)
+- GLX headers (optional, disable direct GLX support with `DISABLE_GLX=1`), usually the development packages for `libgl` include this on your distro
 
-**Ubuntu/Debian users:** the following command ensures you have all the needed packages and headers to compile and run GLava:
+**Ubuntu/Debian users:** the following command ensures you have all the needed packages and headers to compile GLava:
 ```bash
 sudo apt-get install libpulse libpulse-dev libglfw3 libglfw3-dev libxext6 libxext6-dev python make gcc
 ```
@@ -43,28 +44,25 @@ To embed GLava in your desktop (for EWMH compliant window managers), use `#reque
 
 \* On an XDG compliant Linux or BSD system. OSX will use `/Library/glava` and `~/Library/Preferences/glava` instead.
 
-**Note for `#request setopacity`:** While most users will prefer the faster `xroot` transparency, GLFW 3.3 (unreleased) is needed in order to support the `native` transparency option (older versions still work). Arch users can install `glfw-x11-git` from the AUR and recompile GLava for this feature.
-
 ## Desktop window compatibility
 
 GLava aims to be compatible with _most_ EWMH compliant window managers. Below is a list of common window managers and issues specific to them for trying to get GLava to behave as a desktop window or widget:
 
 | WM | ! | Details
 | :---: | --- | --- |
-| GNOME (on X11) | ![-](https://placehold.it/15/118932/000000?text=+) | No notable issues
+| Mutter (GNOME, Budgie) | ![-](https://placehold.it/15/118932/000000?text=+) | `"native"` (default) opacity should be used
 | Openbox (LXDE or standalone) | ![-](https://placehold.it/15/118932/000000?text=+) | [Some tweaks may be required](https://www.reddit.com/r/unixporn/comments/7vcgi4/oc_after_receiving_positive_feedback_here_i/dtrkvja/)
 | Xfwm (XFCE) | ![-](https://placehold.it/15/118932/000000?text=+) | Untested, but should work without issues
 | Fluxbox | ![-](https://placehold.it/15/118932/000000?text=+) | Untested, but should work without issues
 | iceWM | ![-](https://placehold.it/15/118932/000000?text=+) | No notable issues
-| AwesomeWM | ![-](https://placehold.it/15/f09c00/000000?text=+) | Requires the WM to be restarted (`Super + Ctl + R`) in order for new desktop windows to behave correctly, can still be focused, may require other changes to config depending on layout
+| Herbstluftwm | ![-](https://placehold.it/15/118932/000000?text=+) | `hc rule windowtype~'_NET_WM_WINDOW_TYPE_DESKTOP' manage=off` can be used to unmanage desktop windows
-| Budgie Desktop | ![-](https://placehold.it/15/f09c00/000000?text=+) | `"xroot"` transparency breaks with Budgie's wallpaper window
+| AwesomeWM | ![-](https://placehold.it/15/f09c00/000000?text=+) | Can still be focused, may require other changes to config depending on layout
 | kwin (KDE) | ![-](https://placehold.it/15/f09c00/000000?text=+) | [Issues with workspaces and stacking](https://github.com/wacossusca34/glava/issues/4), needs further testing
 | i3 (and i3-gaps) | ![-](https://placehold.it/15/f03c15/000000?text=+) | [i3 does not respect the `"desktop"` window type](https://github.com/wacossusca34/glava/issues/6)
 | EXWM | ![-](https://placehold.it/15/f03c15/000000?text=+) | EXWM does not have a desktop, and forces window decorations
 | Unity | ![-](https://placehold.it/15/1589F0/000000?text=+) | Needs testing
 | Enlightenment | ![-](https://placehold.it/15/1589F0/000000?text=+) | Needs testing
 | Bspwm | ![-](https://placehold.it/15/1589F0/000000?text=+) | Needs testing
-| Herbstluftwm | ![-](https://placehold.it/15/1589F0/000000?text=+) | Needs testing
 | xmonad | ![-](https://placehold.it/15/1589F0/000000?text=+) | Needs testing
 | Any non EWMH-compliant WM | ![-](https://placehold.it/15/f03c15/000000?text=+) | Window types and hints will not work if the window manager does not support the EWMH standards.
 

glava.c

@@ -18,7 +18,7 @@
 #include "render.h"
 #include "xwin.h"
 
-#define GLAVA_VERSION "1.3"
+#define GLAVA_VERSION "1.4"
 #ifdef GLAD_DEBUG
 #define GLAVA_RELEASE_TYPE_PREFIX "debug, "
 #else
@@ -167,18 +167,22 @@ static const char* help_str =
     "-C, --copy-config       creates copies and symbolic links in the user configuration\n"
     "                          directory for glava, copying any files in the root directory\n"
     "                          of the installed shader directory, and linking any modules.\n"
+    "-b, --backend           specifies a window creation backend to use. By default, the most\n"
+    "                          appropriate backend will be used for the underlying windowing\n"
+    "                          system.\n"
     "-V, --version           print application version and exit\n"
     "\n"
     GLAVA_VERSION_STRING "\n"
     " -- Copyright (C) 2017 Levi Webb\n";
 
-static const char* opt_str = "hvVe:Cm:";
+static const char* opt_str = "hvVe:Cm:b:";
 static struct option p_opts[] = {
     {"help",        no_argument,       0, 'h'},
     {"verbose",     no_argument,       0, 'v'},
     {"entry",       required_argument, 0, 'e'},
     {"force-mod",   required_argument, 0, 'm'},
     {"copy-config", no_argument,       0, 'C'},
+    {"backend",     required_argument, 0, 'b'},
     {"version",     no_argument,       0, 'V'},
     {0,             0,                 0,  0 }
 };
@@ -190,6 +194,7 @@ int main(int argc, char** argv) {
     const char* user_path    = SHADER_USER_PATH;
     const char* entry        = "rc.glsl";
     const char* force        = NULL;
+    const char* backend      = NULL;
     const char* system_shader_paths[] = { user_path, install_path, NULL };
     bool verbose = false;
     bool copy_mode = false;
@@ -201,6 +206,7 @@ int main(int argc, char** argv) {
         case 'C': copy_mode = true;   break;
         case 'e': entry     = optarg; break;
         case 'm': force     = optarg; break;
+        case 'b': backend   = optarg; break;
         case '?': exit(EXIT_FAILURE); break;
         case 'V':
             puts(GLAVA_VERSION_STRING);
@@ -219,7 +225,7 @@ int main(int argc, char** argv) {
         exit(EXIT_SUCCESS);
     }
 
-    renderer* r = rd_new(system_shader_paths, entry, force);
+    renderer* r = rd_new(system_shader_paths, entry, force, backend);
 
     float b0[r->bufsize_request], b1[r->bufsize_request];
     size_t t;

glfw_wcb.c

@@ -37,9 +37,9 @@
 #endif
 
 #define DECL_WINDOW_HINT(F, H) \
-    static void F(void* _, bool var) { glfwWindowHint(H, var); }
+    static void F(bool var) { glfwWindowHint(H, var); }
 #define DECL_WINDOW_HINT_STUB(F) \
-    static void F(void* _, bool _) { fprintf(stderr, "Warning: " #F " not implemented for GLFW backend\n"); }
+    static void F(bool _) { fprintf(stderr, "Warning: " #F " not implemented for GLFW backend\n"); }
 
 static void init(void) {
     if (!glfwInit()) {
@@ -97,7 +97,7 @@ static void* create_and_bind(const char* name, const char* class,
     return w;
 }
 
-static void set_transparent(GLFWwindow* w, bool transparent) {
+static void set_transparent(bool transparent) {
     #ifdef GLFW_TRANSPARENT_FRAMEBUFFER
     glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, transparent ? GLFW_TRUE : GLFW_FALSE);
     #elif GLFW_TRANSPARENT
@@ -124,14 +124,14 @@ static bool swap_buffers(GLFWwindow* w) {
     glfwPollEvents();
 }
 
-static Display* get_x11_display(GLFWwindow* w)                 { return glfwGetX11Display();      }
+static Display* get_x11_display(void)                          { return glfwGetX11Display();      }
 static Window   get_x11_window (GLFWwindow* w)                 { return glfwGetX11Window(w);      }
 static bool     should_close   (GLFWwindow* w)                 { return glfwWindowShouldClose(w); }
 static void     get_fbsize     (GLFWwindow* w, int* d, int* h) { glfwGetFramebufferSize(w, d, h); }
 static void     get_pos        (GLFWwindow* w, int* x, int* y) { glfwGetWindowPos(w, x, y);       }
 static double   get_time       (GLFWwindow* w)                 { return glfwGetTime();            }
 static void     set_time       (GLFWwindow* w, double time)    { glfwSetTime(time);               }
-static void     set_swap       (GLFWwindow* w, int i)          { glfwSwapInterval(i); }
+static void     set_swap       (int i)                         { glfwSwapInterval(i); }
 
 WCB_ATTACH("glfw", wcb_glfw);
 

glx_wcb.c

@@ -0,0 +1,279 @@
+
+/* Xlib window creation and GLX context creation backend */
+
+#ifdef GLAVA_GLX
+
+#define GLAVA_RDX11
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <errno.h>
+#include <math.h>
+#include <time.h>
+
+#include <X11/Xlib.h>
+#include <X11/extensions/Xrender.h>
+#include <X11/Xatom.h>
+
+#include <glad/glad.h>
+#include <GL/glx.h>
+
+#include "render.h"
+#include "xwin.h"
+
+#define GLX_CONTEXT_MAJOR_VERSION_ARB       0x2091
+#define GLX_CONTEXT_MINOR_VERSION_ARB       0x2092
+typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
+typedef void       (*glXSwapIntervalEXTProc)        (Display*, GLXDrawable, int);
+
+extern struct gl_wcb wcb_glx;
+
+static Display* display;
+
+static int swap;
+
+static bool floating, decorated, focused, maximized, transparent;
+
+struct glxwin {
+    Window w;
+    GLXContext context;
+    double time;
+    bool should_close;
+};
+
+static void init(void) {
+    display = XOpenDisplay(NULL);
+    if (!display) {
+        fprintf(stderr, "XOpenDisplay(): could not establish connection to X11 server\n");
+        abort();
+    }
+    floating    = false;
+    decorated   = true;
+    focused     = false;
+    maximized   = false;
+    transparent = false;
+}
+
+static void apply_decorations(Window w) {
+    if (!decorated) {
+        struct {
+            unsigned long flags, functions, decorations;
+            long input_mode;
+            unsigned long status;
+        } hints;
+
+        hints.flags       = 2;
+        hints.decorations = 0;
+        
+        Atom motif = XInternAtom(display, "_MOTIF_WM_HINTS", false);
+
+        XChangeProperty(display, w, motif, motif, 32, PropModeReplace,
+                        (unsigned char*) &hints, sizeof(hints) / sizeof(long));
+    }
+}
+
+static void* create_and_bind(const char* name, const char* class,
+                             const char* type, const char** states,
+                             size_t states_sz,
+                             int d, int h,
+                             int x, int y,
+                             int version_major, int version_minor) {
+    struct glxwin* w = malloc(sizeof(struct glxwin));
+    w->time         = 0.0D;
+    w->should_close = false;
+
+    XVisualInfo* vi;
+    XSetWindowAttributes attr;
+    GC gc;
+    GLXFBConfig* fbc;
+    int fb_sz, best = -1, samp = -1;
+
+    static int gl_attrs[] = {
+        GLX_X_RENDERABLE,  True,
+        GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
+        GLX_RENDER_TYPE,   GLX_RGBA_BIT,
+        GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
+        GLX_DOUBLEBUFFER,  True,
+        GLX_RED_SIZE,      8,
+        GLX_GREEN_SIZE,    8,
+        GLX_BLUE_SIZE,     8,
+        GLX_ALPHA_SIZE,    8,
+        None
+    };
+    
+    int context_attrs[] = {
+        GLX_CONTEXT_MAJOR_VERSION_ARB, version_major,
+        GLX_CONTEXT_MINOR_VERSION_ARB, version_minor,
+        // GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
+        None
+    };
+    
+    fbc = glXChooseFBConfig(display, DefaultScreen(display), gl_attrs, &fb_sz);
+    if (!fbc) {
+        fprintf(stderr, "glXChooseFBConfig(): failed\n" );
+        abort();
+    }
+    
+    for (int t = 0; t < fb_sz; ++t) {
+        XVisualInfo* xvi = glXGetVisualFromFBConfig(display, fbc[t]);
+        if (xvi) {
+            int samp_buf, samples;
+            glXGetFBConfigAttrib(display, fbc[t], GLX_SAMPLE_BUFFERS, &samp_buf);
+            glXGetFBConfigAttrib(display, fbc[t], GLX_SAMPLES,        &samples );
+            XRenderPictFormat* fmt = XRenderFindVisualFormat(display, xvi->visual);
+            
+            if (!fmt || (transparent ? fmt->direct.alphaMask == 0 : fmt->direct.alphaMask != 0))
+                continue;
+            
+            if (best < 0 || samp_buf && samples > samp) {
+                best = t;
+                samp = samples;
+            }
+            XFree(xvi);
+        }
+    }
+
+    if (best == -1) {
+        fprintf(stderr, "Could not find suitable format for FBConfig\n");
+        abort();
+    }
+
+    GLXFBConfig config = fbc[best];
+    XFree(fbc);
+    
+    vi = glXGetVisualFromFBConfig(display, config);
+    
+    attr.colormap          = XCreateColormap(display, DefaultRootWindow(display), vi->visual, AllocNone);
+    attr.event_mask        = ExposureMask | KeyPressMask | StructureNotifyMask;
+    attr.background_pixmap = None;
+    attr.border_pixel      = 0;
+    
+    if (!(w->w = XCreateWindow(display, DefaultRootWindow(display),
+                               x, y, d, h, 0,
+                               vi->depth, InputOutput, vi->visual,
+                               CWColormap | CWEventMask | CWBackPixmap | CWBorderPixel,
+                               &attr))) {
+        fprintf(stderr, "XCreateWindow(): failed\n");
+        abort();
+    }
+    
+    if (type)
+        xwin_settype(&wcb_glx, w, type);
+
+    for (size_t t = 0; t < states_sz; ++t)
+        xwin_addstate(&wcb_glx, w, states[t]);
+
+    if (floating) xwin_addstate(&wcb_glx, w, "above");
+    if (maximized) {
+        xwin_addstate(&wcb_glx, w, "maximized_horz");
+        xwin_addstate(&wcb_glx, w, "maximized_vert");
+    }
+
+    apply_decorations(w->w);
+
+    XFree(vi);
+    
+    gc = XCreateGC(display, w->w, 0, 0);
+    
+    XStoreName(display, w->w, name);
+
+    Atom dwin = XInternAtom(display, "WM_DELETE_WINDOW", false);
+    XSetWMProtocols(display, w->w, &dwin, 1);
+
+    glXCreateContextAttribsARBProc glXCreateContextAttribsARB = NULL;
+    glXSwapIntervalEXTProc glXSwapIntervalEXT = NULL;
+    glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc)
+        glXGetProcAddressARB((const GLubyte*) "glXCreateContextAttribsARB");
+    glXSwapIntervalEXT = (glXSwapIntervalEXTProc)
+        glXGetProcAddressARB((const GLubyte*) "glXSwapIntervalEXT");
+
+    if (!glXCreateContextAttribsARB) {
+        fprintf(stderr, "glXGetProcAddressARB(\"glXCreateContextAttribsARB\"): failed\n");
+        abort();
+    }
+
+    if (!(w->context = glXCreateContextAttribsARB(display, config, 0, True, context_attrs))) {
+        fprintf(stderr, "glXCreateContextAttribsARB(): failed\n");
+        abort();
+    }
+
+    XSync(display, False);
+    
+    glXMakeCurrent(display, w->w, w->context);
+    gladLoadGL();
+
+    GLXDrawable drawable = glXGetCurrentDrawable();
+    
+    if (glXSwapIntervalEXT) glXSwapIntervalEXT(display, drawable, swap);
+
+    return w;
+}
+
+static void set_swap       (int  _swap)        { swap        = _swap;        }
+static void set_floating   (bool _floating)    { floating    = _floating;    }
+static void set_decorated  (bool _decorated)   { decorated   = _decorated;   }
+static void set_focused    (bool _focused)     { focused     = _focused;     }
+static void set_maximized  (bool _maximized)   { maximized   = _maximized;   }
+static void set_transparent(bool _transparent) { transparent = _transparent; }
+
+static void set_geometry(struct glxwin* w, int x, int y, int d, int h) {
+    XMoveResizeWindow(display, w->w, x, y, (unsigned int) d, (unsigned int) h);
+}
+
+static void set_visible(struct glxwin* w, bool visible) {
+    if (visible) XMapWindow(display, w->w);
+    else XUnmapWindow(display, w->w);
+}
+
+static bool should_close(struct glxwin* w) {
+    return w->should_close;
+}
+
+static void swap_buffers(struct glxwin* w) {
+    glXSwapBuffers(display, w->w);
+    
+    while (XPending(display) > 0) {
+        XEvent ev;
+        XNextEvent(display, &ev);
+        switch (ev.type) {
+        case ClientMessage:
+            if (ev.xclient.message_type  == XInternAtom(display, "WM_PROTOCOLS", 1)
+                && ev.xclient.data.l[0]  == XInternAtom(display, "WM_DELETE_WINDOW", 1)) {
+                w->should_close = true;
+            }
+        default: break;
+        }
+    }
+}
+
+static void get_fbsize(struct glxwin* w, int* d, int* h) {
+    XWindowAttributes a;
+    XGetWindowAttributes(display, w->w, &a);
+    *d = a.width;
+    *h = a.height;
+}
+
+static void get_pos(struct glxwin* w, int* x, int* y) {
+    XWindowAttributes a;
+    Window _ignored;
+    XTranslateCoordinates(display, w->w, DefaultRootWindow(display), 0, 0, x, y, &_ignored);
+}
+
+static double get_timert(void) {
+    struct timespec tv;
+    if (clock_gettime(CLOCK_REALTIME, &tv)) {
+        fprintf(stderr, "clock_gettime(CLOCK_REALTIME, ...): %s\n", strerror(errno));
+    }
+    return (double) tv.tv_sec + ((double) tv.tv_nsec / 1000000000.0D);
+}
+
+static double   get_time       (struct glxwin* w)              { return get_timert() - w->time; }
+static void     set_time       (struct glxwin* w, double time) { w->time = get_timert() - time; }
+static Display* get_x11_display(struct glxwin* w)              { return display; }
+static Window   get_x11_window (struct glxwin* w)              { return w->w;    }
+
+WCB_ATTACH("glx", wcb_glx);
+
+#endif /* GLAVA_GLX */

render.c

@@ -35,18 +35,17 @@
 #define VERTEX_SHADER_SRC \
     "layout(location = 0) in vec3 pos; void main() { gl_Position = vec4(pos.x, pos.y, 0.0F, 1.0F); }"
 
-/* Window creation backend interfaces */
+struct gl_wcb* wcbs[2] = {};
-#ifdef GLAVA_GLFW
+static size_t wcbs_idx = 0;
-extern struct gl_wcb wcb_glfw;
-#endif
 
-#define INIT_WCBS()                             \
+static inline void register_wcb(struct gl_wcb* wcb) { wcbs[wcbs_idx++] = wcb; }
+
+#define DECL_WCB(N)                             \
     do {                                        \
-        wcbs[0] = wcb_glfw;                     \
+        extern struct gl_wcb N;                 \
+        register_wcb(&N);                       \
     } while (0)
 
-struct gl_wcb wcbs[2] = {};
-
 /* GLSL bind source */
  
 struct gl_bind_src {
@@ -682,7 +681,8 @@ static struct gl_bind_src* lookup_bind_src(const char* str) {
     return NULL;
 }
 
-struct renderer* rd_new(const char** paths, const char* entry, const char* force_mod) {
+struct renderer* rd_new(const char** paths, const char* entry,
+                        const char* force_mod, const char* force_backend) {
     
     renderer* r = malloc(sizeof(struct renderer));
     *r = (struct renderer) {
@@ -727,19 +727,40 @@ struct renderer* rd_new(const char** paths, const char* entry, const char* force
         .clear_color     = { 0.0F, 0.0F, 0.0F, 0.0F }
     };
 
-    const char* backend = "glfw";
+    bool forced = force_backend != NULL;
+    const char* backend = force_backend;
 
-    INIT_WCBS();
+    /* Window creation backend interfaces */
+    #ifdef GLAVA_GLFW
+    DECL_WCB(wcb_glfw);
+    if (!forced) backend = "glfw";
+    #endif
 
-    #ifdef GLAVA_UNIX
+    #ifdef GLAVA_GLX
-    if (!getenv("WAYLAND_DISPLAY") && getenv("DISPLAY")) {
+    DECL_WCB(wcb_glx);
-        // backend = "glx";
+    if (!forced && !getenv("WAYLAND_DISPLAY") && getenv("DISPLAY")) {
+        backend = "glx";
     }
     #endif
 
-    for (size_t t = 0; t < sizeof(wcbs) / sizeof(*wcbs); ++t) {
+    if (!backend) {
-        if (wcbs[t].name && !strcmp(wcbs[t].name, backend)) {
+        fprintf(stderr, "No backend available for the active windowing system\n");
-            gl->wcb = &wcbs[t];
+        if (wcbs_idx == 0) {
+            fprintf(stderr, "None have been compiled into this build.\n");
+        } else {
+            fprintf(stderr, "Available backends:\n");
+            for (size_t t = 0; t < wcbs_idx; ++t) {
+                fprintf(stderr, "\t\"%s\"\n", wcbs[t]->name);
+            }
+        }
+        exit(EXIT_FAILURE);
+    }
+
+    printf("Using backend: '%s'\n", backend);
+
+    for (size_t t = 0; t < wcbs_idx; ++t) {
+        if (wcbs[t]->name && !strcmp(wcbs[t]->name, backend)) {
+            gl->wcb = wcbs[t];
             break;
         }
     };
@@ -773,7 +794,7 @@ struct renderer* rd_new(const char** paths, const char* entry, const char* force
 
     #define WINDOW_HINT(request)                                        \
         { .name = "set" #request, .fmt = "b",                           \
-                .handler = RHANDLER(name, args, { gl->wcb->set_##request(gl->w, *(bool*) args[0]); }) }
+                .handler = RHANDLER(name, args, { gl->wcb->set_##request(*(bool*) args[0]); }) }
     
     struct request_handler handlers[] = {
         {
@@ -784,7 +805,7 @@ struct renderer* rd_new(const char** paths, const char* entry, const char* force
                     
                     gl->use_alpha = true;
 
-                    gl->wcb->set_transparent(gl->w, native_opacity);
+                    gl->wcb->set_transparent(native_opacity);
 
                     if (!strcmp("xroot", (char*) args[0]))
                         gl->copy_desktop = true;
@@ -870,7 +891,7 @@ struct renderer* rd_new(const char** paths, const char* entry, const char* force
         {   .name = "setshaderversion", .fmt = "i",
             .handler = RHANDLER(name, args, { shader_version = *(int*) args[0]; })           },
         {   .name = "setswap", .fmt = "i",
-            .handler = RHANDLER(name, args, { gl->wcb->set_swap(gl->w, *(int*) args[0]); })  },
+            .handler = RHANDLER(name, args, { gl->wcb->set_swap(*(int*) args[0]); })         },
         {   .name = "setframerate", .fmt = "i",
             .handler = RHANDLER(name, args, { gl->rate = *(int*) args[0]; })                 },
         {   .name = "setprintframes", .fmt = "b",
@@ -1334,8 +1355,8 @@ void rd_update(struct renderer* r, float* lb, float* rb, size_t bsz, bool modifi
                 "out vec4 fragment;"                                                                 "\n"
                 "in vec4 gl_FragCoord;"                                                              "\n"
                 "void main() {"                                                                      "\n"
-                "    fragment = texture(tex, vec2(gl_FragCoord.x / screen.x, "                       "\n"
+                "    fragment = texelFetch(tex, ivec2(gl_FragCoord.x, "                              "\n"
-                "                       (screen.y - gl_FragCoord.y) / screen.y));"                   "\n"
+                "                       screen.y - gl_FragCoord.y), 0);"                             "\n"
                 "    fragment.a = 1.0F;"                                                             "\n"
                 "}"                                                                                  "\n";
             if (!setup) {

render.h

@@ -12,7 +12,7 @@ typedef struct renderer {
 } renderer;
 
 struct renderer* rd_new            (const char** paths, const char* entry,
-                                    const char* force_mod);
+                                    const char* force_mod, const char* force_backend);
 void             rd_update         (struct renderer*, float* lb, float* rb,
                                     size_t bsz, bool modified);
 void             rd_destroy        (struct renderer*);
@@ -22,7 +22,7 @@ struct gl_wcb*   rd_get_wcb        (struct renderer*);
 
 /* gl_wcb - OpenGL Window Creation Backend interface */
 struct gl_wcb {
-    const char* name;\
+    const char* name;
     void     (*init)           (void);
     void*    (*create_and_bind)(const char* name, const char* class,
                                 const char* type, const char** states,
@@ -32,15 +32,15 @@ struct gl_wcb {
                                 int version_major, int version_minor);
     bool     (*should_close)   (void* ptr);
     bool     (*swap_buffers)   (void* ptr);
-    void     (*set_swap)       (void* ptr, int interval);
     void     (*get_pos)        (void* ptr, int* x, int* y);
     void     (*get_fbsize)     (void* ptr, int* w, int* h);
     void     (*set_geometry)   (void* ptr, int x, int y, int w, int h);
-    void     (*set_floating)   (void* ptr, bool floating);
+    void     (*set_swap)       (int interval);
-    void     (*set_decorated)  (void* ptr, bool decorated);
+    void     (*set_floating)   (bool floating);
-    void     (*set_focused)    (void* ptr, bool focused);
+    void     (*set_decorated)  (bool decorated);
-    void     (*set_maximized)  (void* ptr, bool maximized);
+    void     (*set_focused)    (bool focused);
-    void     (*set_transparent)(void* ptr, bool transparent);
+    void     (*set_maximized)  (bool maximized);
+    void     (*set_transparent)(bool transparent);
     double   (*get_time)       (void* ptr);
     void     (*set_time)       (void* ptr, double time);
     void     (*set_visible)    (void* ptr, bool visible);

shaders/rc.glsl

@@ -51,7 +51,7 @@
 #request settitle "GLava"
 
 /* GLFW window geometry (x, y, width, height) */
-#request setgeometry 0 0 400 600
+#request setgeometry 0 0 800 600
 
 /* Window background color (RGB format).
    Only works with `setopacity "none"` */
@@ -68,7 +68,7 @@
    
    https://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#idm140130317606816
 */
-#request setxwintype "normal"
+#request setxwintype "desktop"
 
 /* (X11 only) EWMH Window state atoms (multiple can be specified).
    Possible values are: