glfw/tests/fsaa.c
2010-11-17 16:39:55 +01:00

136 lines
3.7 KiB
C

//========================================================================
// Fullscreen anti-aliasing 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 two high contrast, slowly rotating quads, one aliased
// and one (hopefully) anti-aliased, thus allowing for visual verification
// of whether FSAA is indeed enabled
//
//========================================================================
#include <GL/glfw3.h>
#include <GL/glext.h>
#include <stdio.h>
#include <stdlib.h>
#include "getopt.h"
static void window_size_callback(GLFWwindow window, int width, int height)
{
glViewport(0, 0, width, height);
}
static void usage(void)
{
printf("Usage: fsaa [-h] [-s SAMPLES]\n");
}
int main(int argc, char** argv)
{
int ch, samples = 4;
GLFWwindow window;
while ((ch = getopt(argc, argv, "hs:")) != -1)
{
switch (ch)
{
case 'h':
usage();
exit(EXIT_SUCCESS);
case 's':
samples = atoi(optarg);
break;
default:
usage();
exit(EXIT_FAILURE);
}
}
if (!glfwInit())
{
fprintf(stderr, "Failed to initialize GLFW: %s\n", glfwErrorString(glfwGetError()));
exit(EXIT_FAILURE);
}
if (samples)
printf("Requesting FSAA with %i samples\n", samples);
else
printf("Requesting that FSAA not be available\n");
glfwOpenWindowHint(GLFW_FSAA_SAMPLES, samples);
window = glfwOpenWindow(800, 400, GLFW_WINDOWED, "Aliasing Detector", NULL);
if (!window)
{
glfwTerminate();
fprintf(stderr, "Failed to open GLFW window: %s\n", glfwErrorString(glfwGetError()));
exit(EXIT_FAILURE);
}
glfwSetWindowSizeCallback(window_size_callback);
glfwSwapInterval(1);
samples = glfwGetWindowParam(window, GLFW_FSAA_SAMPLES);
if (samples)
printf("Context reports FSAA is available with %i samples\n", samples);
else
printf("Context reports FSAA is unavailable\n");
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.f, 1.f, 0.f, 0.5f);
glMatrixMode(GL_MODELVIEW);
while (glfwIsWindow(window))
{
GLfloat time = (GLfloat) glfwGetTime();
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.f, 1.f, 1.f);
glLoadIdentity();
glTranslatef(0.25f, 0.25f, 0.f);
glRotatef(time, 0.f, 0.f, 1.f);
glDisable(GL_MULTISAMPLE_ARB);
glRectf(-0.15f, -0.15f, 0.15f, 0.15f);
glLoadIdentity();
glTranslatef(0.75f, 0.25f, 0.f);
glRotatef(time, 0.f, 0.f, 1.f);
glEnable(GL_MULTISAMPLE_ARB);
glRectf(-0.15f, -0.15f, 0.15f, 0.15f);
glfwSwapBuffers();
glfwPollEvents();
}
glfwTerminate();
exit(EXIT_SUCCESS);
}