You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
163 lines
4.3 KiB
163 lines
4.3 KiB
//========================================================================
|
|
// Multisample anti-aliasing test
|
|
// Copyright (c) Camilla Berglund <elmindreda@glfw.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 MSAA is indeed enabled
|
|
//
|
|
//========================================================================
|
|
|
|
#include <glad/glad.h>
|
|
#include <GLFW/glfw3.h>
|
|
|
|
#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)
|
|
{
|
|
glViewport(0, 0, width, height);
|
|
}
|
|
|
|
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
|
|
{
|
|
if (action != GLFW_PRESS)
|
|
return;
|
|
|
|
switch (key)
|
|
{
|
|
case GLFW_KEY_SPACE:
|
|
glfwSetTime(0.0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void usage(void)
|
|
{
|
|
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);
|
|
|
|
if (!glfwInit())
|
|
exit(EXIT_FAILURE);
|
|
|
|
if (samples)
|
|
printf("Requesting MSAA with %i samples\n", samples);
|
|
else
|
|
printf("Requesting that MSAA not be available\n");
|
|
|
|
glfwWindowHint(GLFW_SAMPLES, samples);
|
|
glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
|
|
|
|
window = glfwCreateWindow(800, 400, "Aliasing Detector", NULL, NULL);
|
|
if (!window)
|
|
{
|
|
glfwTerminate();
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
glfwSetKeyCallback(window, key_callback);
|
|
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
|
|
|
|
glfwMakeContextCurrent(window);
|
|
gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
|
|
glfwSwapInterval(1);
|
|
|
|
if (!GLAD_GL_ARB_multisample && !GLAD_GL_VERSION_1_3)
|
|
{
|
|
printf("Multisampling is not supported\n");
|
|
|
|
glfwTerminate();
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
glfwShowWindow(window);
|
|
|
|
glGetIntegerv(GL_SAMPLES, &samples);
|
|
if (samples)
|
|
printf("Context reports MSAA is available with %i samples\n", samples);
|
|
else
|
|
printf("Context reports MSAA is unavailable\n");
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glOrtho(0.f, 1.f, 0.f, 0.5f, 0.f, 1.f);
|
|
glMatrixMode(GL_MODELVIEW);
|
|
|
|
while (!glfwWindowShouldClose(window))
|
|
{
|
|
GLfloat time = (GLfloat) glfwGetTime();
|
|
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
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(window);
|
|
glfwPollEvents();
|
|
}
|
|
|
|
glfwTerminate();
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|