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188 行
4.7 KiB
188 行
4.7 KiB
//========================================================================
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// Gamma correction test program
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// Copyright (c) Camilla Berglund <elmindreda@glfw.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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//
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// This program is used to test the gamma correction functionality for
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// both full screen and windowed mode windows
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//
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//========================================================================
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "getopt.h"
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#define STEP_SIZE 0.1f
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static GLfloat gamma_value = 1.0f;
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static void usage(void)
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{
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printf("Usage: gamma [-h] [-f]\n");
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printf("Options:\n");
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printf(" -f create full screen window\n");
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printf(" -h show this help\n");
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}
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static void set_gamma(GLFWwindow* window, float value)
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{
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GLFWmonitor* monitor = glfwGetWindowMonitor(window);
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if (!monitor)
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monitor = glfwGetPrimaryMonitor();
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gamma_value = value;
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printf("Gamma: %f\n", gamma_value);
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glfwSetGamma(monitor, gamma_value);
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}
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static void error_callback(int error, const char* description)
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{
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fprintf(stderr, "Error: %s\n", description);
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}
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static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
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{
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if (action != GLFW_PRESS)
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return;
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switch (key)
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{
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case GLFW_KEY_ESCAPE:
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{
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glfwSetWindowShouldClose(window, GLFW_TRUE);
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break;
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}
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case GLFW_KEY_KP_ADD:
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case GLFW_KEY_UP:
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case GLFW_KEY_Q:
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{
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set_gamma(window, gamma_value + STEP_SIZE);
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break;
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}
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case GLFW_KEY_KP_SUBTRACT:
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case GLFW_KEY_DOWN:
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case GLFW_KEY_W:
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{
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if (gamma_value - STEP_SIZE > 0.f)
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set_gamma(window, gamma_value - STEP_SIZE);
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break;
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}
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}
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}
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static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
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{
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glViewport(0, 0, width, height);
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}
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int main(int argc, char** argv)
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{
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int width, height, ch;
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GLFWmonitor* monitor = NULL;
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GLFWwindow* window;
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glfwSetErrorCallback(error_callback);
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if (!glfwInit())
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exit(EXIT_FAILURE);
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while ((ch = getopt(argc, argv, "fh")) != -1)
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{
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switch (ch)
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{
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case 'h':
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usage();
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exit(EXIT_SUCCESS);
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case 'f':
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monitor = glfwGetPrimaryMonitor();
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break;
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default:
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usage();
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exit(EXIT_FAILURE);
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}
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}
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if (monitor)
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{
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const GLFWvidmode* mode = glfwGetVideoMode(monitor);
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glfwWindowHint(GLFW_REFRESH_RATE, mode->refreshRate);
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glfwWindowHint(GLFW_RED_BITS, mode->redBits);
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glfwWindowHint(GLFW_GREEN_BITS, mode->greenBits);
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glfwWindowHint(GLFW_BLUE_BITS, mode->blueBits);
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width = mode->width;
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height = mode->height;
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}
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else
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{
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width = 200;
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height = 200;
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}
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window = glfwCreateWindow(width, height, "Gamma Test", monitor, NULL);
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if (!window)
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{
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glfwTerminate();
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exit(EXIT_FAILURE);
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}
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set_gamma(window, 1.f);
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glfwMakeContextCurrent(window);
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gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
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glfwSwapInterval(1);
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glfwSetKeyCallback(window, key_callback);
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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glMatrixMode(GL_PROJECTION);
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glOrtho(-1.f, 1.f, -1.f, 1.f, -1.f, 1.f);
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glMatrixMode(GL_MODELVIEW);
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glClearColor(0.5f, 0.5f, 0.5f, 0);
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while (!glfwWindowShouldClose(window))
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{
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glClear(GL_COLOR_BUFFER_BIT);
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glColor3f(0.8f, 0.2f, 0.4f);
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glRectf(-0.5f, -0.5f, 0.5f, 0.5f);
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glfwSwapBuffers(window);
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glfwWaitEvents();
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}
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glfwTerminate();
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exit(EXIT_SUCCESS);
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}
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