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https://github.com/glfw/glfw.git
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110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
//========================================================================
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// Fullscreen multisampling anti-aliasing test
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// Copyright (c) Camilla Berglund <elmindreda@elmindreda.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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//
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// This test renders two high contrast, slowly rotating quads, one aliased
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// and one (hopefully) anti-aliased, thus allowing for visual verification
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// of whether FSAA is indeed enabled
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//
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//========================================================================
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#include <GL/glfw3.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef GL_ARB_multisample
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#define GL_MULTISAMPLE_ARB 0x809D
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#endif
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static void window_size_callback(GLFWwindow window, int width, int height)
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{
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glViewport(0, 0, width, height);
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}
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int main(void)
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{
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GLFWwindow window;
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if (!glfwInit())
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{
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fprintf(stderr, "Failed to initialize GLFW\n");
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exit(EXIT_FAILURE);
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}
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glfwOpenWindowHint(GLFW_FSAA_SAMPLES, 4);
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window = glfwOpenWindow(400, 400, GLFW_WINDOW);
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if (!window)
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{
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glfwTerminate();
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fprintf(stderr, "Failed to open GLFW window\n");
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exit(EXIT_FAILURE);
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}
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glfwSetWindowTitle(window, "Aliasing Detector");
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glfwSetWindowSizeCallback(window, window_size_callback);
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glfwSwapInterval(1);
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int samples = glfwGetWindowParam(window, GLFW_FSAA_SAMPLES);
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if (samples)
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printf("Context reports FSAA is supported with %i samples\n", samples);
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else
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printf("Context reports FSAA is unsupported\n");
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glMatrixMode(GL_PROJECTION);
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gluOrtho2D(0.f, 1.f, 0.f, 1.f);
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while (glfwIsWindow(window))
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{
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GLfloat time = (GLfloat) glfwGetTime();
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glClear(GL_COLOR_BUFFER_BIT);
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glLoadIdentity();
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glTranslatef(0.5f, 0.f, 0.f);
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glRotatef(time, 0.f, 0.f, 1.f);
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glEnable(GL_MULTISAMPLE_ARB);
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glColor3f(1.f, 1.f, 1.f);
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glRectf(-0.25f, -0.25f, 0.25f, 0.25f);
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glLoadIdentity();
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glTranslatef(-0.5f, 0.f, 0.f);
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glRotatef(time, 0.f, 0.f, 1.f);
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glDisable(GL_MULTISAMPLE_ARB);
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glColor3f(1.f, 1.f, 1.f);
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glRectf(-0.25f, -0.25f, 0.25f, 0.25f);
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glfwSwapBuffers();
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glfwPollEvents();
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}
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glfwTerminate();
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exit(EXIT_SUCCESS);
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}
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