diff options
Diffstat (limited to 'glfw-3.2.1/tests/tearing.c')
| -rw-r--r-- | glfw-3.2.1/tests/tearing.c | 214 |
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); +} + |