glfw/tests/fsaa.c

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//========================================================================
// Fullscreen multisampling 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/glfw.h>
#include <stdio.h>
#include <stdlib.h>
#ifndef GL_ARB_multisample
#define GL_MULTISAMPLE_ARB 0x809D
#endif
static void window_size_callback(GLFWwindow window, int width, int height)
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{
glViewport(0, 0, width, height);
}
int main(void)
{
GLFWwindow window;
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if (!glfwInit())
{
fprintf(stderr, "Failed to initialize GLFW\n");
exit(EXIT_FAILURE);
}
glfwOpenWindowHint(GLFW_FSAA_SAMPLES, 4);
window = glfwOpenWindow(400, 400, GLFW_WINDOW);
if (!window)
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{
glfwTerminate();
fprintf(stderr, "Failed to open GLFW window\n");
exit(EXIT_FAILURE);
}
glfwSetWindowTitle(window, "Aliasing Detector");
glfwSetWindowSizeCallback(window, window_size_callback);
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glfwSwapInterval(1);
int samples = glfwGetWindowParam(window, GLFW_FSAA_SAMPLES);
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if (samples)
printf("Context reports FSAA is supported with %i samples\n", samples);
else
printf("Context reports FSAA is unsupported\n");
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.f, 1.f, 0.f, 1.f);
while (glfwIsWindow(window))
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{
GLfloat time = (GLfloat) glfwGetTime();
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.5f, 0.f, 0.f);
glRotatef(time, 0.f, 0.f, 1.f);
glEnable(GL_MULTISAMPLE_ARB);
glColor3f(1.f, 1.f, 1.f);
glRectf(-0.25f, -0.25f, 0.25f, 0.25f);
glLoadIdentity();
glTranslatef(-0.5f, 0.f, 0.f);
glRotatef(time, 0.f, 0.f, 1.f);
glDisable(GL_MULTISAMPLE_ARB);
glColor3f(1.f, 1.f, 1.f);
glRectf(-0.25f, -0.25f, 0.25f, 0.25f);
glfwSwapBuffers();
glfwPollEvents();
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}
glfwTerminate();
exit(EXIT_SUCCESS);
}