glfw/tests/gamma.c

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//========================================================================
// Gamma correction test program
// 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 program is used to test the gamma correction functionality for
// both fullscreen and windowed mode windows
//
//========================================================================
#include <GL/glfw3.h>
#include <stdio.h>
#include <stdlib.h>
#include "getopt.h"
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#define STEP_SIZE 0.1f
static GLboolean closed = GL_FALSE;
static GLfloat gamma_value = 1.0f;
static void usage(void)
{
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printf("Usage: gamma [-h] [-f]\n");
}
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static void set_gamma(float value)
{
gamma_value = value;
printf("Gamma: %f\n", gamma_value);
glfwSetGamma(gamma_value);
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}
static int window_close_callback(GLFWwindow window)
{
closed = GL_TRUE;
return GL_FALSE;
}
static void key_callback(GLFWwindow window, int key, int action)
{
if (action != GLFW_PRESS)
return;
switch (key)
{
case GLFW_KEY_ESCAPE:
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{
closed = GL_TRUE;
break;
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}
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case GLFW_KEY_KP_ADD:
case GLFW_KEY_Q:
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{
set_gamma(gamma_value + STEP_SIZE);
break;
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}
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case GLFW_KEY_KP_SUBTRACT:
case GLFW_KEY_W:
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{
if (gamma_value - STEP_SIZE > 0.f)
set_gamma(gamma_value - STEP_SIZE);
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break;
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}
}
}
static void size_callback(GLFWwindow window, int width, int height)
{
glViewport(0, 0, width, height);
}
int main(int argc, char** argv)
{
int width, height, ch;
int mode = GLFW_WINDOWED;
GLFWwindow window;
while ((ch = getopt(argc, argv, "fh")) != -1)
{
switch (ch)
{
case 'h':
usage();
exit(EXIT_SUCCESS);
case 'f':
mode = GLFW_FULLSCREEN;
break;
default:
usage();
exit(EXIT_FAILURE);
}
}
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if (!glfwInit())
{
fprintf(stderr, "Failed to initialize GLFW: %s\n", glfwErrorString(glfwGetError()));
exit(EXIT_FAILURE);
}
if (mode == GLFW_FULLSCREEN)
{
GLFWvidmode desktop_mode;
glfwGetDesktopMode(&desktop_mode);
width = desktop_mode.width;
height = desktop_mode.height;
}
else
{
width = 0;
height = 0;
}
window = glfwCreateWindow(width, height, mode, "Gamma Test", NULL);
if (!window)
{
glfwTerminate();
fprintf(stderr, "Failed to open GLFW window: %s\n", glfwErrorString(glfwGetError()));
exit(EXIT_FAILURE);
}
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set_gamma(1.f);
glfwMakeContextCurrent(window);
glfwSwapInterval(1);
glfwSetKeyCallback(window, key_callback);
glfwSetWindowCloseCallback(window, window_close_callback);
glfwSetWindowSizeCallback(window, size_callback);
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glMatrixMode(GL_PROJECTION);
glOrtho(-1.f, 1.f, -1.f, 1.f, -1.f, 1.f);
glMatrixMode(GL_MODELVIEW);
glClearColor(0.5f, 0.5f, 0.5f, 0);
while (!closed)
{
glClear(GL_COLOR_BUFFER_BIT);
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glColor3f(0.8f, 0.2f, 0.4f);
glRectf(-0.5f, -0.5f, 0.5f, 0.5f);
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
exit(EXIT_SUCCESS);
}