Initial Commit

1 files changed, 214 insertions, 0 deletions

diff --git a/glfw-3.2.1/tests/tearing.c b/glfw-3.2.1/tests/tearing.c
new file mode 100644
index 0000000..5cd48b3
--- /dev/null
+++ b/glfw-3.2.1/tests/tearing.c
@@ -0,0 +1,214 @@
+//========================================================================
+// Vsync enabling test
+// Copyright (c) Camilla Berglund <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.
+//
+//========================================================================
+//
+// This test renders a high contrast, horizontally moving bar, allowing for
+// visual verification of whether the set swap interval is indeed obeyed
+//
+//========================================================================
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include "getopt.h"
+
+static int swap_tear;
+static int swap_interval;
+static double frame_rate;
+
+static void usage(void)
+{
+    printf("Usage: tearing [-h] [-f]\n");
+    printf("Options:\n");
+    printf("  -f create full screen window\n");
+    printf("  -h show this help\n");
+}
+
+static void update_window_title(GLFWwindow* window)
+{
+    char title[256];
+
+    sprintf(title, "Tearing detector (interval %i%s, %0.1f Hz)",
+            swap_interval,
+            (swap_tear && swap_interval < 0) ? " (swap tear)" : "",
+            frame_rate);
+
+    glfwSetWindowTitle(window, title);
+}
+
+static void set_swap_interval(GLFWwindow* window, int interval)
+{
+    swap_interval = interval;
+    glfwSwapInterval(swap_interval);
+    update_window_title(window);
+}
+
+static void error_callback(int error, const char* description)
+{
+    fprintf(stderr, "Error: %s\n", description);
+}
+
+static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
+{
+    glViewport(0, 0, width, height);
+}
+
+static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+    if (action != GLFW_PRESS)
+        return;
+
+    switch (key)
+    {
+        case GLFW_KEY_UP:
+        {
+            if (swap_interval + 1 > swap_interval)
+                set_swap_interval(window, swap_interval + 1);
+            break;
+        }
+
+        case GLFW_KEY_DOWN:
+        {
+            if (swap_tear)
+            {
+                if (swap_interval - 1 < swap_interval)
+                    set_swap_interval(window, swap_interval - 1);
+            }
+            else
+            {
+                if (swap_interval - 1 >= 0)
+                    set_swap_interval(window, swap_interval - 1);
+            }
+            break;
+        }
+
+        case GLFW_KEY_ESCAPE:
+            glfwSetWindowShouldClose(window, 1);
+            break;
+    }
+}
+
+int main(int argc, char** argv)
+{
+    int ch, width, height;
+    float position;
+    unsigned long frame_count = 0;
+    double last_time, current_time;
+    int fullscreen = GLFW_FALSE;
+    GLFWmonitor* monitor = NULL;
+    GLFWwindow* window;
+
+    while ((ch = getopt(argc, argv, "fh")) != -1)
+    {
+        switch (ch)
+        {
+            case 'h':
+                usage();
+                exit(EXIT_SUCCESS);
+
+            case 'f':
+                fullscreen = GLFW_TRUE;
+                break;
+        }
+    }
+
+    glfwSetErrorCallback(error_callback);
+
+    if (!glfwInit())
+        exit(EXIT_FAILURE);
+
+    if (fullscreen)
+    {
+        const GLFWvidmode* mode;
+
+        monitor = glfwGetPrimaryMonitor();
+        mode = glfwGetVideoMode(monitor);
+
+        glfwWindowHint(GLFW_RED_BITS, mode->redBits);
+        glfwWindowHint(GLFW_GREEN_BITS, mode->greenBits);
+        glfwWindowHint(GLFW_BLUE_BITS, mode->blueBits);
+        glfwWindowHint(GLFW_REFRESH_RATE, mode->refreshRate);
+
+        width = mode->width;
+        height = mode->height;
+    }
+    else
+    {
+        width = 640;
+        height = 480;
+    }
+
+    window = glfwCreateWindow(width, height, "", monitor, NULL);
+    if (!window)
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    glfwMakeContextCurrent(window);
+    gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
+    set_swap_interval(window, 0);
+
+    last_time = glfwGetTime();
+    frame_rate = 0.0;
+    swap_tear = (glfwExtensionSupported("WGL_EXT_swap_control_tear") ||
+                 glfwExtensionSupported("GLX_EXT_swap_control_tear"));
+
+    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+    glfwSetKeyCallback(window, key_callback);
+
+    glMatrixMode(GL_PROJECTION);
+    glOrtho(-1.f, 1.f, -1.f, 1.f, 1.f, -1.f);
+    glMatrixMode(GL_MODELVIEW);
+
+    while (!glfwWindowShouldClose(window))
+    {
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        position = cosf((float) glfwGetTime() * 4.f) * 0.75f;
+        glRectf(position - 0.25f, -1.f, position + 0.25f, 1.f);
+
+        glfwSwapBuffers(window);
+        glfwPollEvents();
+
+        frame_count++;
+
+        current_time = glfwGetTime();
+        if (current_time - last_time > 1.0)
+        {
+            frame_rate = frame_count / (current_time - last_time);
+            frame_count = 0;
+            last_time = current_time;
+            update_window_title(window);
+        }
+    }
+
+    glfwTerminate();
+    exit(EXIT_SUCCESS);
+}
+