diff options
Diffstat (limited to 'libs/glfw-3.3.8/tests/tearing.c')
| -rw-r--r-- | libs/glfw-3.3.8/tests/tearing.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/libs/glfw-3.3.8/tests/tearing.c b/libs/glfw-3.3.8/tests/tearing.c new file mode 100644 index 0000000..1760121 --- /dev/null +++ b/libs/glfw-3.3.8/tests/tearing.c @@ -0,0 +1,250 @@ +//======================================================================== +// Vsync enabling test +// 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. +// +//======================================================================== +// +// This test renders a high contrast, horizontally moving bar, allowing for +// visual verification of whether the set swap interval is indeed obeyed +// +//======================================================================== + +#include <glad/gl.h> +#define GLFW_INCLUDE_NONE +#include <GLFW/glfw3.h> + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> + +#include "linmath.h" + +static const struct +{ + float x, y; +} vertices[4] = +{ + { -0.25f, -1.f }, + { 0.25f, -1.f }, + { 0.25f, 1.f }, + { -0.25f, 1.f } +}; + +static const char* vertex_shader_text = +"#version 110\n" +"uniform mat4 MVP;\n" +"attribute vec2 vPos;\n" +"void main()\n" +"{\n" +" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n" +"}\n"; + +static const char* fragment_shader_text = +"#version 110\n" +"void main()\n" +"{\n" +" gl_FragColor = vec4(1.0);\n" +"}\n"; + +static int swap_tear; +static int swap_interval; +static double frame_rate; + +static void update_window_title(GLFWwindow* window) +{ + char title[256]; + + snprintf(title, sizeof(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 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; + + case GLFW_KEY_F11: + case GLFW_KEY_ENTER: + { + static int x, y, width, height; + + if (mods != GLFW_MOD_ALT) + return; + + if (glfwGetWindowMonitor(window)) + glfwSetWindowMonitor(window, NULL, x, y, width, height, 0); + else + { + GLFWmonitor* monitor = glfwGetPrimaryMonitor(); + const GLFWvidmode* mode = glfwGetVideoMode(monitor); + glfwGetWindowPos(window, &x, &y); + glfwGetWindowSize(window, &width, &height); + glfwSetWindowMonitor(window, monitor, + 0, 0, mode->width, mode->height, + mode->refreshRate); + } + + break; + } + } +} + +int main(int argc, char** argv) +{ + unsigned long frame_count = 0; + double last_time, current_time; + GLFWwindow* window; + GLuint vertex_buffer, vertex_shader, fragment_shader, program; + GLint mvp_location, vpos_location; + + glfwSetErrorCallback(error_callback); + + if (!glfwInit()) + exit(EXIT_FAILURE); + + glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2); + glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0); + + window = glfwCreateWindow(640, 480, "Tearing detector", NULL, NULL); + if (!window) + { + glfwTerminate(); + exit(EXIT_FAILURE); + } + + glfwMakeContextCurrent(window); + gladLoadGL(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")); + + glfwSetKeyCallback(window, key_callback); + + glGenBuffers(1, &vertex_buffer); + glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer); + glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); + + vertex_shader = glCreateShader(GL_VERTEX_SHADER); + glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL); + glCompileShader(vertex_shader); + + fragment_shader = glCreateShader(GL_FRAGMENT_SHADER); + glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL); + glCompileShader(fragment_shader); + + program = glCreateProgram(); + glAttachShader(program, vertex_shader); + glAttachShader(program, fragment_shader); + glLinkProgram(program); + + mvp_location = glGetUniformLocation(program, "MVP"); + vpos_location = glGetAttribLocation(program, "vPos"); + + glEnableVertexAttribArray(vpos_location); + glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE, + sizeof(vertices[0]), (void*) 0); + + while (!glfwWindowShouldClose(window)) + { + int width, height; + mat4x4 m, p, mvp; + float position = cosf((float) glfwGetTime() * 4.f) * 0.75f; + + glfwGetFramebufferSize(window, &width, &height); + + glViewport(0, 0, width, height); + glClear(GL_COLOR_BUFFER_BIT); + + mat4x4_ortho(p, -1.f, 1.f, -1.f, 1.f, 0.f, 1.f); + mat4x4_translate(m, position, 0.f, 0.f); + mat4x4_mul(mvp, p, m); + + glUseProgram(program); + glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp); + glDrawArrays(GL_TRIANGLE_FAN, 0, 4); + + 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); +} + |