glfw/tests/msaa.c

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//========================================================================
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// Multisample anti-aliasing test
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// Copyright (c) Camilla Löwy <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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#if defined(_MSC_VER)
// Make MS math.h define M_PI
#define _USE_MATH_DEFINES
#endif
#include "linmath.h"
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#include <stdio.h>
#include <stdlib.h>
#include "getopt.h"
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static const vec2 vertices[4] =
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{
{ -0.6f, -0.6f },
{ 0.6f, -0.6f },
{ 0.6f, 0.6f },
{ -0.6f, 0.6f }
};
static const char* vertex_shader_text =
"#version 110\n"
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"uniform mat4 MVP;\n"
"attribute vec2 vPos;\n"
"void main()\n"
"{\n"
" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n"
"}\n";
static const char* fragment_shader_text =
"#version 110\n"
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"void main()\n"
"{\n"
" gl_FragColor = vec4(1.0);\n"
"}\n";
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static void error_callback(int error, const char* description)
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{
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fprintf(stderr, "Error: %s\n", description);
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}
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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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case GLFW_KEY_ESCAPE:
glfwSetWindowShouldClose(window, GLFW_TRUE);
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;
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GLuint vertex_buffer, vertex_shader, fragment_shader, program;
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GLint mvp_location, vpos_location;
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_CONTEXT_VERSION_MAJOR, 2);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
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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);
glfwMakeContextCurrent(window);
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gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
glfwSwapInterval(1);
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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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glGenBuffers(1, &vertex_buffer);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL);
glCompileShader(vertex_shader);
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL);
glCompileShader(fragment_shader);
program = glCreateProgram();
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
glLinkProgram(program);
mvp_location = glGetUniformLocation(program, "MVP");
vpos_location = glGetAttribLocation(program, "vPos");
glEnableVertexAttribArray(vpos_location);
glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
sizeof(vertices[0]), (void*) 0);
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while (!glfwWindowShouldClose(window))
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{
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float ratio;
int width, height;
mat4x4 m, p, mvp;
const double angle = glfwGetTime() * M_PI / 180.0;
glfwGetFramebufferSize(window, &width, &height);
ratio = width / (float) height;
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glViewport(0, 0, width, height);
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glClear(GL_COLOR_BUFFER_BIT);
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glUseProgram(program);
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mat4x4_ortho(p, -ratio, ratio, -1.f, 1.f, 0.f, 1.f);
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mat4x4_translate(m, -1.f, 0.f, 0.f);
mat4x4_rotate_Z(m, m, (float) angle);
mat4x4_mul(mvp, p, m);
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glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
glDisable(GL_MULTISAMPLE);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
mat4x4_translate(m, 1.f, 0.f, 0.f);
mat4x4_rotate_Z(m, m, (float) angle);
mat4x4_mul(mvp, p, m);
glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
glEnable(GL_MULTISAMPLE);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
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glfwSwapBuffers(window);
glfwPollEvents();
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}
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glfwDestroyWindow(window);
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glfwTerminate();
exit(EXIT_SUCCESS);
}