fix: add opengl metadata

Makefile.dev

@@ -39,7 +39,6 @@ build-no-video:
 		-lm -lGL -lglfw -lasound \
 		-Wall -Wextra \
 		-Wno-format-truncation \
-		-Wno-unused-parameter \
 		-DGLFW_INCLUDE_NONE \
 		-DGLFW_NATIVE_INCLUDE_NONE \
 		-DLOG_USE_COLOR \

PKGBUILD

@@ -1,12 +1,12 @@
 pkgname=forge-steel
-pkgver=1.2.0
+pkgver=1.2.4
 pkgrel=1
 pkgdesc="Fusion Of Real Time Generative Effects"
 arch=('i686' 'pentium4' 'x86_64' 'arm' 'armv7h' 'armv6h' 'aarch64' 'riscv64')
 depends=('glfw>=1:3', 'v4l-utils>=1.32', 'alsa-lib>=1.2', 'libglvnd>=1.7')
 url="https://git.klemek.fr/klemek/forge-steel"
 source=("${pkgname}-steel-${pkgver}.tar.gz::https://git.klemek.fr/klemek/forge-steel/releases/download/v${pkgver}/${pkgname}-${pkgver}.tar.gz")
-sha256sums=('b04e9159eb3eb809029bf02423e4bf844ecdb3b11cbcb49d8eed8f2505d32a1f')
+sha256sums=('a34c7f8101d8d947e26bee1fa5ab8d87f4292014e5ef17d03eb34fefb387db9e')
 srcdir=build
 backup=("usr/share/${pkgname}")
 

README.md

@@ -263,6 +263,28 @@ Working with pages and items, you can use the following predefined sources and e
 
 See the [printable version](./docs/forge_default_mapping.pdf).
 
+### Available hotkeys
+
+| Hotkey | Function |
+| ------ | -------- |
+| <kbd>Shift</kbd> + <kbd>F</kbd> | Switch between shader-decoded or hardware decoded YUYV |
+| <kbd>M</kbd> | Projection mapping 1 |
+| <kbd>Shift</kbd> + <kbd>M</kbd> | Projection mapping 2 |
+| <kbd>Ctrl</kbd> + <kbd>M</kbd> | Projection mapping 3 |
+| <kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>M</kbd> | Projection mapping 4 |
+
+### Projection Mappings
+
+In any of the projection mapping mode, use the nanoKONTROL2 last 4 columns to control 4 on-screen points:
+
+| Midi Control | Function |
+| ------ | -------- |
+| Fader N | point N - X position |
+| Knob N | point N - Y position |
+| Last column top button | activate projection mapping |
+| Last column middle button | invert projection mapping |
+| Last column bottom button | show projection borders |
+
 ## Making your own FORGE project
 
 You want to embrace the "user" in "user-defined"? It's time to make your own project.

configure.ac

@@ -1,4 +1,4 @@
-AC_INIT([forge], [steel-1.2.0], [klemek.dev@proton.me])
+AC_INIT([forge], [steel-1.2.4], [klemek.dev@proton.me])
 AM_INIT_AUTOMAKE
 AC_PROG_CC
 

default/forge_project.cfg

@@ -235,11 +235,14 @@ GROUP_1_6_Y=19
 GROUP_1_6_Z=
 
 # Same for group 2
-GROUP_2_ACTIVE_COUNT=4
+GROUP_2_ACTIVE_COUNT=7
 GROUP_2_ACTIVE_1=36
 GROUP_2_ACTIVE_2=68
 GROUP_2_ACTIVE_3=52
-GROUP_2_ACTIVE_4=11077
+GROUP_2_ACTIVE_4=1077
+GROUP_2_ACTIVE_5=11077
+GROUP_2_ACTIVE_6=101077
+GROUP_2_ACTIVE_7=111077
 GROUP_2_COUNT=7
 GROUP_2_1_X=37
 GROUP_2_1_Y=53
@@ -273,12 +276,12 @@ GROUP_3_2_Y=16
 GROUP_3_2_Z=11089
 
 # Auto-Random Ignore (ARI) prefixes
-ARI_COUNT=17
+ARI_COUNT=62
 ARI_1=GROUP_3_1_Y
 ARI_2=GROUP_3_2_Z
-ARI_3=GROUP_2_1_X_4
-ARI_4=GROUP_2_1_Y_4
-ARI_5=GROUP_2_1_Z_4
+ARI_3=GROUP_2_5_X_4
+ARI_4=GROUP_2_5_Y_4
+ARI_5=GROUP_2_5_Z_4
 ARI_6=GROUP_2_2_X_4
 ARI_7=GROUP_2_2_Y_4
 ARI_8=GROUP_2_2_Z_4
@@ -291,6 +294,51 @@ ARI_14=GROUP_2_6_Z_4
 ARI_15=GROUP_2_7_X_4
 ARI_16=GROUP_2_7_Y_4
 ARI_17=GROUP_2_7_Z_4
+ARI_18=GROUP_2_5_X_5
+ARI_19=GROUP_2_5_Y_5
+ARI_20=GROUP_2_5_Z_5
+ARI_21=GROUP_2_2_X_5
+ARI_22=GROUP_2_2_Y_5
+ARI_23=GROUP_2_2_Z_5
+ARI_24=GROUP_2_4_X_5
+ARI_25=GROUP_2_4_Y_5
+ARI_26=GROUP_2_4_Z_5
+ARI_27=GROUP_2_6_X_5
+ARI_28=GROUP_2_6_Y_5
+ARI_29=GROUP_2_6_Z_5
+ARI_30=GROUP_2_7_X_5
+ARI_31=GROUP_2_7_Y_5
+ARI_32=GROUP_2_7_Z_5
+ARI_33=GROUP_2_5_X_6
+ARI_34=GROUP_2_5_Y_6
+ARI_35=GROUP_2_5_Z_6
+ARI_36=GROUP_2_2_X_6
+ARI_37=GROUP_2_2_Y_6
+ARI_38=GROUP_2_2_Z_6
+ARI_39=GROUP_2_4_X_6
+ARI_40=GROUP_2_4_Y_6
+ARI_41=GROUP_2_4_Z_6
+ARI_42=GROUP_2_6_X_6
+ARI_43=GROUP_2_6_Y_6
+ARI_44=GROUP_2_6_Z_6
+ARI_45=GROUP_2_7_X_6
+ARI_46=GROUP_2_7_Y_6
+ARI_47=GROUP_2_7_Z_6
+ARI_48=GROUP_2_5_X_7
+ARI_49=GROUP_2_5_Y_7
+ARI_50=GROUP_2_5_Z_7
+ARI_51=GROUP_2_2_X_7
+ARI_52=GROUP_2_2_Y_7
+ARI_53=GROUP_2_2_Z_7
+ARI_54=GROUP_2_4_X_7
+ARI_55=GROUP_2_4_Y_7
+ARI_56=GROUP_2_4_Z_7
+ARI_57=GROUP_2_6_X_7
+ARI_58=GROUP_2_6_Y_7
+ARI_59=GROUP_2_6_Z_7
+ARI_60=GROUP_2_7_X_7
+ARI_61=GROUP_2_7_Y_7
+ARI_62=GROUP_2_7_Z_7
 
 # =====
 # OTHER

default/frag9.glsl

@@ -10,34 +10,104 @@ out vec4 fragColor;
 
 uniform sampler2D iTex0;
 uniform vec3 iGroup2_4[7];
+uniform vec3 iGroup2_5[7];
+uniform vec3 iGroup2_6[7];
+uniform vec3 iGroup2_7[7];
 
 void main() {
-    bool visible = iGroup2_4[0].x > 0;
-    bool invert = iGroup2_4[0].y > 0;
-    float rect = iGroup2_4[0].z;
+    bool visible = (iGroup2_4[4].x + iGroup2_5[4].x + iGroup2_6[4].x + iGroup2_7[4].x) > 0;
+    bool invert = (iGroup2_4[4].y + iGroup2_5[4].y + iGroup2_6[4].y + iGroup2_7[4].y) > 0;
+    float rect = clamp(iGroup2_4[4].z + iGroup2_5[4].z + iGroup2_6[4].z + iGroup2_7[4].z, 0, 1);
+    bool modified = false;
 
-    vec2 uv2 = vUV;
+    vec2 uv = mix(vec2(0), vUV, base_mask(vUV));
 
-    if (visible) {
-        vec2 p1 = vec2(iGroup2_4[6].xy);
-        vec2 p2 = vec2(iGroup2_4[1].xy);
-        vec2 p3 = vec2(iGroup2_4[3].xy);
-        vec2 p4 = vec2(iGroup2_4[5].xy);
+    if (iGroup2_4[4].x > 0) {
+        vec2 p11 = vec2(iGroup2_4[6].xy);
+        vec2 p12 = vec2(iGroup2_4[1].xy);
+        vec2 p13 = vec2(iGroup2_4[3].xy);
+        vec2 p14 = vec2(iGroup2_4[5].xy);
 
-        p2.x = 1 - p2.x;
-        p3.y = 1 - p3.y;
-        p4.x = 1 - p4.x;
-        p4.y = 1 - p4.y;
+        p12.x = 1 - p12.x;
+        p13.y = 1 - p13.y;
+        p14.x = 1 - p14.x;
+        p14.y = 1 - p14.y;
 
-        uv2 = project_4p(vUV, p1, p2, p3, p4);
+        vec2 uv1 = project_4p(vUV, p11, p12, p13, p14);
+        uv1 = mix(vec2(0), uv1, base_mask(uv1));
+        uv = uv1;
+        modified = true;
     }
 
-    vec4 color = texture(iTex0, invert ? vUV : uv2);
+    if (iGroup2_5[4].x > 0) {
+        vec2 p21 = vec2(iGroup2_5[6].xy);
+        vec2 p22 = vec2(iGroup2_5[1].xy);
+        vec2 p23 = vec2(iGroup2_5[3].xy);
+        vec2 p24 = vec2(iGroup2_5[5].xy);
+
+        p22.x = 1 - p22.x;
+        p23.y = 1 - p23.y;
+        p24.x = 1 - p24.x;
+        p24.y = 1 - p24.y;
+
+        vec2 uv2 = project_4p(vUV, p21, p22, p23, p24);
+        uv2 = mix(vec2(0), uv2, base_mask(uv2));
+        if (modified) {
+            uv = mix(uv, uv2, step(0.0001, length(uv2)));
+        } else {
+            uv = uv2;
+        }
+        modified = true;
+    }
+
+    if (iGroup2_6[4].x > 0) {
+        vec2 p31 = vec2(iGroup2_6[6].xy);
+        vec2 p32 = vec2(iGroup2_6[1].xy);
+        vec2 p33 = vec2(iGroup2_6[3].xy);
+        vec2 p34 = vec2(iGroup2_6[5].xy);
+
+        p32.x = 1 - p32.x;
+        p33.y = 1 - p33.y;
+        p34.x = 1 - p34.x;
+        p34.y = 1 - p34.y;
+
+        vec2 uv3 = project_4p(vUV, p31, p32, p33, p34);
+        uv3 = mix(vec2(0), uv3, base_mask(uv3));
+        if (modified) {
+            uv = mix(uv, uv3, step(0.0001, length(uv3)));
+        } else {
+            uv = uv3;
+        }
+        modified = true;
+    }
+
+    if (iGroup2_7[4].x > 0) {
+        vec2 p41 = vec2(iGroup2_7[6].xy);
+        vec2 p42 = vec2(iGroup2_7[1].xy);
+        vec2 p43 = vec2(iGroup2_7[3].xy);
+        vec2 p44 = vec2(iGroup2_7[5].xy);
+
+        p42.x = 1 - p42.x;
+        p43.y = 1 - p43.y;
+        p44.x = 1 - p44.x;
+        p44.y = 1 - p44.y;
+
+        vec2 uv4 = project_4p(vUV, p41, p42, p43, p44);
+        uv4 = mix(vec2(0), uv4, base_mask(uv4));
+        if (modified) {
+            uv = mix(uv, uv4, step(0.0001, length(uv4)));
+        } else {
+            uv = uv4;
+        }
+        modified = true;
+    }
+
+    vec4 color = texture(iTex0, invert ? vUV : uv);
 
     if (visible) {
-        float mask = step(0, uv2.x) * step(-1, -uv2.x) * step(0, uv2.y) * step(-1, -uv2.y);
+        float mask = step(0.0001, length(uv));
         color *= mix(mask, 1 - mask, invert ? 1 : 0);
-        color = mix(color, color + mask * vec4(1), rect * (step(uv2.x, 0.01) + step(uv2.y, 0.01) + step(1 - uv2.y, 0.01) + step(1 - uv2.x, 0.01)));
+        color = mix(color, color + mask * vec4(1), rect * (step(uv.x, 0.01) + step(uv.y, 0.01) + step(1 - uv.y, 0.01) + step(1 - uv.x, 0.01)));
     }
 
     fragColor = color;

default/inc_map.glsl

@@ -23,4 +23,8 @@ vec2 project_4p(vec2 uv, vec2 p1, vec2 p2, vec2 p3, vec2 p4) {
     return tmp.xy / tmp.z;
 }
 
+float base_mask(vec2 uv) {
+    return step(0, uv.x) * step(-1, -uv.x) * step(0, uv.y) * step(-1, -uv.y);
+}
+
 #endif

include/glad/gl.h

@@ -1,11 +1,11 @@
 /**
- * Loader generated by glad 2.0.8 on Wed May 13 21:57:23 2026
+ * Loader generated by glad 2.0.8 on Thu Aug 27 15:42:48 2026
  *
  * SPDX-License-Identifier: (WTFPL OR CC0-1.0) AND Apache-2.0
  *
  * Generator: C/C++
  * Specification: gl
- * Extensions: 4
+ * Extensions: 5
  *
  * APIs:
  *  - gl:compatibility=4.6
@@ -19,10 +19,10 @@
  *  - ON_DEMAND = False
  *
  * Commandline:
- *    --api='gl:compatibility=4.6' --extensions='GL_ARB_direct_state_access,GL_EXT_EGL_image_storage,GL_EXT_direct_state_access,GL_KHR_debug' c --header-only --loader
+ *    --api='gl:compatibility=4.6' --extensions='GL_ARB_arrays_of_arrays,GL_ARB_direct_state_access,GL_EXT_EGL_image_storage,GL_EXT_direct_state_access,GL_KHR_debug' c --header-only --loader
  *
  * Online:
- *    http://glad.sh/#api=gl%3Acompatibility%3D4.6&extensions=GL_ARB_direct_state_access%2CGL_EXT_EGL_image_storage%2CGL_EXT_direct_state_access%2CGL_KHR_debug&generator=c&options=HEADER_ONLY%2CLOADER
+ *    http://glad.sh/#api=gl%3Acompatibility%3D4.6&extensions=GL_ARB_arrays_of_arrays%2CGL_ARB_direct_state_access%2CGL_EXT_EGL_image_storage%2CGL_EXT_direct_state_access%2CGL_KHR_debug&generator=c&options=HEADER_ONLY%2CLOADER
  *
  */
 
@@ -2403,6 +2403,8 @@ GLAD_API_CALL int GLAD_GL_VERSION_4_4;
 GLAD_API_CALL int GLAD_GL_VERSION_4_5;
 #define GL_VERSION_4_6 1
 GLAD_API_CALL int GLAD_GL_VERSION_4_6;
+#define GL_ARB_arrays_of_arrays 1
+GLAD_API_CALL int GLAD_GL_ARB_arrays_of_arrays;
 #define GL_ARB_direct_state_access 1
 GLAD_API_CALL int GLAD_GL_ARB_direct_state_access;
 #define GL_EXT_EGL_image_storage 1
@@ -6395,6 +6397,7 @@ int GLAD_GL_VERSION_4_3 = 0;
 int GLAD_GL_VERSION_4_4 = 0;
 int GLAD_GL_VERSION_4_5 = 0;
 int GLAD_GL_VERSION_4_6 = 0;
+int GLAD_GL_ARB_arrays_of_arrays = 0;
 int GLAD_GL_ARB_direct_state_access = 0;
 int GLAD_GL_EXT_EGL_image_storage = 0;
 int GLAD_GL_EXT_direct_state_access = 0;
@@ -9290,6 +9293,7 @@ static int glad_gl_find_extensions_gl(void) {
     char **exts_i = NULL;
     if (!glad_gl_get_extensions(&exts, &exts_i)) return 0;
 
+    GLAD_GL_ARB_arrays_of_arrays = glad_gl_has_extension(exts, exts_i, "GL_ARB_arrays_of_arrays");
     GLAD_GL_ARB_direct_state_access = glad_gl_has_extension(exts, exts_i, "GL_ARB_direct_state_access");
     GLAD_GL_EXT_EGL_image_storage = glad_gl_has_extension(exts, exts_i, "GL_EXT_EGL_image_storage");
     GLAD_GL_EXT_direct_state_access = glad_gl_has_extension(exts, exts_i, "GL_EXT_direct_state_access");
@@ -9392,7 +9396,7 @@ int gladLoadGL( GLADloadfunc load) {
 
 
 
-
+ 
 
 #ifdef GLAD_GL
 
@@ -9571,3 +9575,4 @@ void gladLoaderUnloadGL(void) {
 #endif
 
 #endif /* GLAD_GL_IMPLEMENTATION */
+

src/args.c

@@ -11,6 +11,9 @@
 #include "config.h"
 #include "string.h"
 
+#define STR_IMPL_(x) #x     // stringify argument
+#define STR(x) STR_IMPL_(x) // indirection to expand argument macros
+
 static void print_help(int status_code) {
   puts(
       PACKAGE
@@ -42,6 +45,12 @@ static void print_help(int status_code) {
       "[-mr / -nmr] "
       "[-tm] "
       "[-tf] "
+      "[--x11] "
+      "[--wayland] "
+      "[--cocoa] "
+      "[--win32] "
+      "[-oma=MAJOR] "
+      "[-omi=MINOR] "
       "\n\n"
       "Fusion Of Real-time Generative Effects.\n\n"
       "options:\n"
@@ -81,7 +90,17 @@ static void print_help(int status_code) {
       "  -mr, --midi-reconnect       auto-reconnect midi (default)\n"
       "  -nmr, --no-midi-reconnect   do not auto-reconnect midi\n"
       "  -tm, --trace-midi           print midi code and values\n"
-      "  -tf, --trace-fps            print fps status of subsystems\n");
+      "  -tf, --trace-fps            print fps status of subsystems\n"
+      "  --x11                       force X11 GLFW backend\n"
+      "  --wayland                   force Wayland GLFW backend\n"
+      "  --cocoa                     force Cocoa GLFW backend\n"
+      "  --win32                     force Win32 GLFW backend\n"
+      "  -oma, --opengl-major-version      OpenGL major version "
+      "(default: " STR(
+          OPENGL_MAJOR_VERSION) ")\n"
+                                "  -omi, --opengl-minor-version      OpenGL "
+                                "minor version (default: " STR(
+                                    OPENGL_MINOR_VERSION) ")\n");
   exit(status_code);
 }
 
@@ -152,6 +171,9 @@ void args_parse(Parameters *params, int argc, char **argv) {
   params->midi_reconnect = true;
   params->trace_midi = false;
   params->trace_fps = false;
+  params->glfw_backend = GLFW_BACKEND_ANY;
+  params->opengl_major = OPENGL_MAJOR_VERSION;
+  params->opengl_minor = OPENGL_MINOR_VERSION;
 
   for (int i = 1; i < argc; i++) {
     arg = argv[i];
@@ -220,6 +242,24 @@ void args_parse(Parameters *params, int argc, char **argv) {
       params->trace_midi = true;
     } else if (is_arg(arg, "-tf") || is_arg(arg, "--trace-fps")) {
       params->trace_fps = true;
+    } else if (is_arg(arg, "--x11")) {
+      params->glfw_backend = GLFW_BACKEND_X11;
+    } else if (is_arg(arg, "--wayland")) {
+      params->glfw_backend = GLFW_BACKEND_WAYLAND;
+    } else if (is_arg(arg, "--cocoa")) {
+      params->glfw_backend = GLFW_BACKEND_COCOA;
+    } else if (is_arg(arg, "--win32")) {
+      params->glfw_backend = GLFW_BACKEND_WIN32;
+    } else if (is_arg(arg, "-oma") || is_arg(arg, "--opengl-major-version")) {
+      params->opengl_major = parse_uint(arg, value);
+      if (params->opengl_major == 0) {
+        invalid_value(arg, value);
+      }
+    } else if (is_arg(arg, "-omi") || is_arg(arg, "--opengl-minor-version")) {
+      params->opengl_minor = parse_uint(arg, value);
+      if (params->opengl_major == 0) {
+        invalid_value(arg, value);
+      }
     } else {
 #ifdef VIDEO_IN
       if (is_arg(arg, "-vi") || is_arg(arg, "--video-in")) {

src/config.h

@@ -87,4 +87,23 @@
 #define MAX_TAP_VALUES 10
 #endif
 
+/* OPENGL */
+
+#ifndef OPENGL_MAJOR_VERSION
+#define OPENGL_MAJOR_VERSION 4
+#endif
+
+#ifndef OPENGL_MINOR_VERSION
+#define OPENGL_MINOR_VERSION 6
+#endif
+
+/* GLFW CONSTANTS */
+#ifndef GLFW_BACKENDS
+#define GLFW_BACKEND_ANY 0
+#define GLFW_BACKEND_X11 1
+#define GLFW_BACKEND_WAYLAND 2
+#define GLFW_BACKEND_COCOA 3
+#define GLFW_BACKEND_WIN32 4
+#endif
+
 #endif /* CONFIG_H */

src/constants.h

@@ -4,9 +4,9 @@
 #define CONSTANTS_H
 
 static const char *vertex_shader_text =
-    "#version 460\n"
+    "#version 140\n"
     "const mat4 mvp = "
-    "{{2.,0.,0.,0.},{0.,2.,0.,0.},{0.,0.,2.,0.},{-1.,-1.,1.,1.}};\n"
+    "mat4(vec4(2.,0.,0.,0.),vec4(0.,2.,0.,0.),vec4(0.,0.,2.,0.),vec4(-1.,-1.,1.,1.));\n"
     "in vec2 vPos;\n"
     "out vec2 vUV;\n"
     "void main()\n"

src/forge.c

@@ -286,14 +286,15 @@ static bool init(const Parameters *params) {
 
   start_state_background_write();
 
-  window_startup(error_callback);
+  window_startup(error_callback, params->glfw_backend);
 
   context.tex_resolution[0] = params->internal_size;
   context.tex_resolution[1] = params->internal_size;
 
   if (params->output) {
     window_output = window_init(PACKAGE " " VERSION, params->output_screen,
-                                params->windowed, NULL, key_callback);
+                                params->windowed, params->opengl_major,
+                                params->opengl_minor, NULL, key_callback);
 
     window_use(window_output, &context);
 
@@ -305,7 +306,8 @@ static bool init(const Parameters *params) {
   if (params->monitor) {
     window_monitor =
         window_init(PACKAGE " " VERSION " (monitor)", params->monitor_screen,
-                    params->windowed, window_output, key_callback);
+                    params->windowed, params->opengl_major,
+                    params->opengl_minor, window_output, key_callback);
 
     window_use(window_monitor, &context);
 

src/shaders.c

@@ -60,7 +60,7 @@ static void gl_debug_callback(GLenum source, GLenum type, GLuint id,
 
 #endif /* GL_DEBUG */
 
-static bool check_eglerror_ro(const char *context) {
+static bool check_eglerror_ro(__attribute__((unused)) const char *context) {
 #ifdef VIDEO_IN
   unsigned int code;
 
@@ -105,6 +105,13 @@ static bool init_gl(ShaderProgram *program) {
   glDebugMessageCallback(gl_debug_callback, NULL);
 #endif /* GL_DEBUG */
 
+  // print OpenGL info
+  log_info("[OpenGL] Vendor: %s", glGetString(GL_VENDOR));
+  log_info("[OpenGL] Renderer: %s", glGetString(GL_RENDERER));
+  log_info("[OpenGL] Version: %s", glGetString(GL_VERSION));
+  log_info("[OpenGL] Shading language: %s",
+           glGetString(GL_SHADING_LANGUAGE_VERSION));
+
 #ifdef VIDEO_IN
   program->egl_display = glfwGetEGLDisplay();
   if (program->egl_display == EGL_NO_DISPLAY) {

src/types.h

@@ -58,6 +58,9 @@ typedef struct Parameters {
   bool midi_reconnect;
   bool trace_midi;
   bool trace_fps;
+  unsigned int glfw_backend;
+  unsigned int opengl_major;
+  unsigned int opengl_minor;
 } Parameters;
 
 // file.c

src/window.c

@@ -7,7 +7,8 @@
 
 #include "window.h"
 
-static void init_glfw(void (*error_callback)(int, const char *)) {
+static void init_glfw(void (*error_callback)(int, const char *),
+                      const unsigned int backend) {
   log_info("[GLFW] Initializing...");
 
   // set errors handler
@@ -16,6 +17,30 @@ static void init_glfw(void (*error_callback)(int, const char *)) {
   // print current GLFW version
   log_info("[GLFW] %s", glfwGetVersionString());
 
+  switch (backend) {
+#ifdef GLFW_PLATFORM
+  case GLFW_BACKEND_X11:
+    glfwInitHint(GLFW_PLATFORM, GLFW_PLATFORM_X11);
+    log_info("[GLFW] platform: X11");
+    break;
+  case GLFW_BACKEND_WAYLAND:
+    glfwInitHint(GLFW_PLATFORM, GLFW_PLATFORM_WAYLAND);
+    log_info("[GLFW] platform: Wayland");
+    break;
+  case GLFW_BACKEND_COCOA:
+    glfwInitHint(GLFW_PLATFORM, GLFW_PLATFORM_COCOA);
+    log_info("[GLFW] platform: Cocoa");
+    break;
+  case GLFW_BACKEND_WIN32:
+    glfwInitHint(GLFW_PLATFORM, GLFW_BACKEND_WIN32);
+    log_info("[GLFW] platform: Win32");
+    break;
+#endif /* GLFW_PLATFORM */
+  default:
+    log_info("[GLFW] platform: Any");
+    break;
+  }
+
   // init GLFW
   if (!glfwInit()) {
     log_error("[GLFW] Initialization failed");
@@ -44,7 +69,9 @@ static GLFWmonitor *get_monitor(unsigned char monitor_index) {
 }
 
 static GLFWwindow *
-create_window(GLFWmonitor *monitor, const char *title, Window *shared_context,
+create_window(GLFWmonitor *monitor, const char *title,
+              const unsigned int opengl_major, const unsigned int opengl_minor,
+              Window *shared_context,
               void (*key_callback)(Window *, int, int, int, int)) {
   GLFWwindow *window;
 
@@ -57,12 +84,14 @@ create_window(GLFWmonitor *monitor, const char *title, Window *shared_context,
   glfwWindowHint(GLFW_FOCUS_ON_SHOW, GLFW_FALSE);
 
   // Context related hints
-  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, opengl_major);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, opengl_minor);
 #ifdef GL_DEBUG
   glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GLFW_TRUE);
 #endif
-  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+  if (opengl_major > 4 || (opengl_major == 3 && opengl_minor >= 2)) {
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+  }
 
   // create fullscreen window in selected monitor
   window = glfwCreateWindow(1, 1, title, monitor, shared_context);
@@ -86,8 +115,9 @@ create_window(GLFWmonitor *monitor, const char *title, Window *shared_context,
 
 static void use_window(GLFWwindow *window) { glfwMakeContextCurrent(window); }
 
-void window_startup(void (*error_callback)(int, const char *)) {
-  init_glfw(error_callback);
+void window_startup(void (*error_callback)(int, const char *),
+                    const unsigned int backend) {
+  init_glfw(error_callback, backend);
 }
 
 void window_terminate() {
@@ -96,17 +126,21 @@ void window_terminate() {
 }
 
 Window *window_init(const char *title, unsigned char monitor_index,
-                    bool windowed, Window *shared_context,
+                    bool windowed, const unsigned int opengl_major,
+                    const unsigned int opengl_minor, Window *shared_context,
                     void (*key_callback)(Window *, int, int, int, int)) {
   GLFWwindow *window;
   GLFWmonitor *monitor;
 
   monitor = windowed ? NULL : get_monitor(monitor_index);
 
-  window = create_window(monitor, title, shared_context, key_callback);
+  window = create_window(monitor, title, opengl_major, opengl_minor,
+                         shared_context, key_callback);
 
   use_window(window);
 
+  glfwSwapInterval(0);
+
   return window;
 }
 

src/window.h

@@ -3,12 +3,13 @@
 #ifndef WINDOW_H
 #define WINDOW_H
 
-void window_startup(void (*error_callback)(int, const char *));
+void window_startup(void (*error_callback)(int, const char *), const unsigned int backend);
 
 void window_terminate();
 
 Window *window_init(const char *title, unsigned char monitor_index,
-                    bool windowed, Window *shared_context,
+                    bool windowed,  const unsigned int opengl_major,
+                    const unsigned int opengl_minor, Window *shared_context,
                     void (*key_callback)(Window *, int, int, int, int));
 
 void window_update_title(Window *window, const char *title);