Open source Star Ruler 2 source code!

2018-07-17 14:15:37 +02:00
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+//========================================================================
+// Vsync enabling test
+// Copyright (c) Camilla Berglund <elmindreda@elmindreda.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 <GLFW/glfw3.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+static int swap_interval;
+static double frame_rate;
+
+static void update_window_title(GLFWwindow* window)
+{
+    char title[256];
+
+    sprintf(title, "Tearing detector (interval %i, %0.1f Hz)",
+            swap_interval, 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 (key == GLFW_KEY_SPACE && action == GLFW_PRESS)
+        set_swap_interval(window, 1 - swap_interval);
+}
+
+int main(void)
+{
+    float position;
+    unsigned long frame_count = 0;
+    double last_time, current_time;
+    GLFWwindow* window;
+
+    glfwSetErrorCallback(error_callback);
+
+    if (!glfwInit())
+        exit(EXIT_FAILURE);
+
+    window = glfwCreateWindow(640, 480, "", NULL, NULL);
+    if (!window)
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    glfwMakeContextCurrent(window);
+    set_swap_interval(window, 0);
+
+    last_time = glfwGetTime();
+    frame_rate = 0.0;
+
+    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);
+}
+