glfw/tests/msaa.c

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//========================================================================
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// Multisample anti-aliasing test
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// Copyright (c) Camilla Berglund <elmindreda@glfw.org>
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//
// 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
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// of whether MSAA is indeed enabled
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//
//========================================================================
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#include <glad/glad.h>
#include <GLFW/glfw3.h>
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#include <stdio.h>
#include <stdlib.h>
#include "getopt.h"
static void error_callback(int error, const char* description)
{
fprintf(stderr, "Error: %s\n", description);
}
static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
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{
glViewport(0, 0, width, height);
}
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static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
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{
if (action != GLFW_PRESS)
return;
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switch (key)
{
case GLFW_KEY_SPACE:
glfwSetTime(0.0);
break;
}
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}
static void usage(void)
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{
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printf("Usage: msaa [-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);
}
}
glfwSetErrorCallback(error_callback);
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if (!glfwInit())
exit(EXIT_FAILURE);
if (samples)
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printf("Requesting MSAA with %i samples\n", samples);
else
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printf("Requesting that MSAA not be available\n");
glfwWindowHint(GLFW_SAMPLES, samples);
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glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
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window = glfwCreateWindow(800, 400, "Aliasing Detector", NULL, NULL);
if (!window)
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{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwSetKeyCallback(window, key_callback);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwMakeContextCurrent(window);
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gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
glfwSwapInterval(1);
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if (!GLAD_GL_ARB_multisample && !GLAD_GL_VERSION_1_3)
{
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printf("Multisampling is not supported\n");
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwShowWindow(window);
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glGetIntegerv(GL_SAMPLES, &samples);
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if (samples)
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printf("Context reports MSAA is available with %i samples\n", samples);
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else
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printf("Context reports MSAA is unavailable\n");
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glMatrixMode(GL_PROJECTION);
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glOrtho(0.f, 1.f, 0.f, 0.5f, 0.f, 1.f);
glMatrixMode(GL_MODELVIEW);
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while (!glfwWindowShouldClose(window))
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{
GLfloat time = (GLfloat) glfwGetTime();
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.25f, 0.25f, 0.f);
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glRotatef(time, 0.f, 0.f, 1.f);
glDisable(GL_MULTISAMPLE_ARB);
glRectf(-0.15f, -0.15f, 0.15f, 0.15f);
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glLoadIdentity();
glTranslatef(0.75f, 0.25f, 0.f);
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glRotatef(time, 0.f, 0.f, 1.f);
glEnable(GL_MULTISAMPLE_ARB);
glRectf(-0.15f, -0.15f, 0.15f, 0.15f);
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glfwSwapBuffers(window);
glfwPollEvents();
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}
glfwTerminate();
exit(EXIT_SUCCESS);
}