:wMerge branch 'gl-window' into main

1 files changed, 220 insertions, 0 deletions

diff --git a/libs/glfw-3.3.8/tests/msaa.c b/libs/glfw-3.3.8/tests/msaa.c
new file mode 100644
index 0000000..33e2ccc
--- /dev/null
+++ b/libs/glfw-3.3.8/tests/msaa.c
@@ -0,0 +1,220 @@
+//========================================================================
+// Multisample anti-aliasing test
+// Copyright (c) Camilla Löwy <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/gl.h>
+#define GLFW_INCLUDE_NONE
+#include <GLFW/glfw3.h>
+
+#if defined(_MSC_VER)
+ // Make MS math.h define M_PI
+ #define _USE_MATH_DEFINES
+#endif
+
+#include "linmath.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "getopt.h"
+
+static const vec2 vertices[4] =
+{
+    { -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"
+"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"
+"void main()\n"
+"{\n"
+"    gl_FragColor = vec4(1.0);\n"
+"}\n";
+
+static void error_callback(int error, const char* description)
+{
+    fprintf(stderr, "Error: %s\n", description);
+}
+
+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;
+        case GLFW_KEY_ESCAPE:
+            glfwSetWindowShouldClose(window, GLFW_TRUE);
+            break;
+    }
+}
+
+static void usage(void)
+{
+    printf("Usage: msaa [-h] [-s SAMPLES]\n");
+}
+
+int main(int argc, char** argv)
+{
+    int ch, samples = 4;
+    GLFWwindow* window;
+    GLuint vertex_buffer, vertex_shader, fragment_shader, program;
+    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);
+
+    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_CONTEXT_VERSION_MAJOR, 2);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+
+    window = glfwCreateWindow(800, 400, "Aliasing Detector", NULL, NULL);
+    if (!window)
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    glfwSetKeyCallback(window, key_callback);
+
+    glfwMakeContextCurrent(window);
+    gladLoadGL(glfwGetProcAddress);
+    glfwSwapInterval(1);
+
+    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");
+
+    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);
+
+    while (!glfwWindowShouldClose(window))
+    {
+        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;
+
+        glViewport(0, 0, width, height);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        glUseProgram(program);
+
+        mat4x4_ortho(p, -ratio, ratio, -1.f, 1.f, 0.f, 1.f);
+
+        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);
+        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);
+
+        glfwSwapBuffers(window);
+        glfwPollEvents();
+    }
+
+    glfwDestroyWindow(window);
+
+    glfwTerminate();
+    exit(EXIT_SUCCESS);
+}
+