From 3b734f0d6b9e28c1f2c4ae54e3f46e573e02f4a5 Mon Sep 17 00:00:00 2001
From: Andreas Grois <andi@grois.info>
Date: Fri, 9 Mar 2018 21:36:10 +0100
Subject: Initial Commit

---
 glfw-3.2.1/tests/msaa.c | 163 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 glfw-3.2.1/tests/msaa.c

(limited to 'glfw-3.2.1/tests/msaa.c')

diff --git a/glfw-3.2.1/tests/msaa.c b/glfw-3.2.1/tests/msaa.c
new file mode 100644
index 0000000..d6e7df3
--- /dev/null
+++ b/glfw-3.2.1/tests/msaa.c
@@ -0,0 +1,163 @@
+//========================================================================
+// 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);
+}
+
-- 
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