Make windows test a tolerable example

examples/CMakeLists.txt

@@ -33,6 +33,7 @@ add_executable(sharing WIN32 MACOSX_BUNDLE sharing.c ${ICON} ${GLAD_GL})
 add_executable(splitview WIN32 MACOSX_BUNDLE splitview.c ${ICON} ${GLAD_GL})
 add_executable(triangle-opengl WIN32 MACOSX_BUNDLE triangle-opengl.c ${ICON} ${GLAD_GL})
 add_executable(wave WIN32 MACOSX_BUNDLE wave.c ${ICON} ${GLAD_GL})
+add_executable(windows WIN32 MACOSX_BUNDLE windows.c ${ICON} ${GLAD_GL})
 
 target_link_libraries(particles Threads::Threads)
 if (RT_LIBRARY)
@@ -40,7 +41,7 @@ if (RT_LIBRARY)
 endif()
 
 set(GUI_ONLY_BINARIES boing gears heightmap particles sharing splitview
-    triangle-opengl wave)
+    triangle-opengl wave windows)
 set(CONSOLE_BINARIES offscreen)
 
 set_target_properties(${GUI_ONLY_BINARIES} ${CONSOLE_BINARIES} PROPERTIES
@@ -67,6 +68,7 @@ if (APPLE)
     set_target_properties(triangle-opengl PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "OpenGL Triangle")
     set_target_properties(splitview PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "SplitView")
     set_target_properties(wave PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Wave")
+    set_target_properties(windows PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Windows")
 
     set_source_files_properties(glfw.icns PROPERTIES
                                 MACOSX_PACKAGE_LOCATION "Resources")

examples/windows.c

@@ -0,0 +1,109 @@
+//========================================================================
+// Simple multi-window example
+// Copyright (c) Camilla Löwy <elmindreda@glfw.org>
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would
+//    be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such, and must not
+//    be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source
+//    distribution.
+//
+//========================================================================
+
+#include <glad/gl.h>
+#define GLFW_INCLUDE_NONE
+#include <GLFW/glfw3.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char** argv)
+{
+    int xpos, ypos, height;
+    const char* description;
+    GLFWwindow* windows[4];
+
+    if (!glfwInit())
+    {
+        glfwGetError(&description);
+        printf("Error: %s\n", description);
+        exit(EXIT_FAILURE);
+    }
+
+    glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
+    glfwWindowHint(GLFW_DECORATED, GLFW_FALSE);
+
+    glfwGetMonitorWorkarea(glfwGetPrimaryMonitor(), &xpos, &ypos, NULL, &height);
+
+    for (int i = 0;  i < 4;  i++)
+    {
+        const int size = height / 5;
+        const struct
+        {
+            float r, g, b;
+        } colors[] =
+        {
+            { 0.95f, 0.32f, 0.11f },
+            { 0.50f, 0.80f, 0.16f },
+            {   0.f, 0.68f, 0.94f },
+            { 0.98f, 0.74f, 0.04f }
+        };
+
+        if (i > 0)
+            glfwWindowHint(GLFW_FOCUS_ON_SHOW, GLFW_FALSE);
+
+        windows[i] = glfwCreateWindow(size, size, "Multi-Window Example", NULL, NULL);
+        if (!windows[i])
+        {
+            glfwGetError(&description);
+            printf("Error: %s\n", description);
+            glfwTerminate();
+            exit(EXIT_FAILURE);
+        }
+
+        glfwSetWindowPos(windows[i],
+                         xpos + size * (1 + (i & 1)),
+                         ypos + size * (1 + (i >> 1)));
+        glfwSetInputMode(windows[i], GLFW_STICKY_KEYS, GLFW_TRUE);
+
+        glfwMakeContextCurrent(windows[i]);
+        gladLoadGL(glfwGetProcAddress);
+        glClearColor(colors[i].r, colors[i].g, colors[i].b, 1.f);
+    }
+
+    for (int i = 0;  i < 4;  i++)
+        glfwShowWindow(windows[i]);
+
+    for (;;)
+    {
+        for (int i = 0;  i < 4;  i++)
+        {
+            glfwMakeContextCurrent(windows[i]);
+            glClear(GL_COLOR_BUFFER_BIT);
+            glfwSwapBuffers(windows[i]);
+
+            if (glfwWindowShouldClose(windows[i]) ||
+                glfwGetKey(windows[i], GLFW_KEY_ESCAPE))
+            {
+                glfwTerminate();
+                exit(EXIT_SUCCESS);
+            }
+        }
+
+        glfwWaitEvents();
+    }
+}
+