Initial Commit

1 files changed, 186 insertions, 0 deletions

diff --git a/glfw-3.2.1/tests/sharing.c b/glfw-3.2.1/tests/sharing.c
new file mode 100644
index 0000000..a7f1a31
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+++ b/glfw-3.2.1/tests/sharing.c
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+//========================================================================
+// Context sharing test program
+// 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 program is used to test sharing of objects between contexts
+//
+//========================================================================
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define WIDTH  400
+#define HEIGHT 400
+#define OFFSET 50
+
+static GLFWwindow* windows[2];
+
+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 && key == GLFW_KEY_ESCAPE)
+        glfwSetWindowShouldClose(window, GLFW_TRUE);
+}
+
+static GLFWwindow* open_window(const char* title, GLFWwindow* share, int posX, int posY)
+{
+    GLFWwindow* window;
+
+    glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
+    window = glfwCreateWindow(WIDTH, HEIGHT, title, NULL, share);
+    if (!window)
+        return NULL;
+
+    glfwMakeContextCurrent(window);
+    gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
+    glfwSwapInterval(1);
+    glfwSetWindowPos(window, posX, posY);
+    glfwShowWindow(window);
+
+    glfwSetKeyCallback(window, key_callback);
+
+    return window;
+}
+
+static GLuint create_texture(void)
+{
+    int x, y;
+    char pixels[256 * 256];
+    GLuint texture;
+
+    glGenTextures(1, &texture);
+    glBindTexture(GL_TEXTURE_2D, texture);
+
+    for (y = 0;  y < 256;  y++)
+    {
+        for (x = 0;  x < 256;  x++)
+            pixels[y * 256 + x] = rand() % 256;
+    }
+
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 256, 256, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, pixels);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    return texture;
+}
+
+static void draw_quad(GLuint texture)
+{
+    int width, height;
+    glfwGetFramebufferSize(glfwGetCurrentContext(), &width, &height);
+
+    glViewport(0, 0, width, height);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(0.f, 1.f, 0.f, 1.f, 0.f, 1.f);
+
+    glEnable(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, texture);
+    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+    glBegin(GL_QUADS);
+
+    glTexCoord2f(0.f, 0.f);
+    glVertex2f(0.f, 0.f);
+
+    glTexCoord2f(1.f, 0.f);
+    glVertex2f(1.f, 0.f);
+
+    glTexCoord2f(1.f, 1.f);
+    glVertex2f(1.f, 1.f);
+
+    glTexCoord2f(0.f, 1.f);
+    glVertex2f(0.f, 1.f);
+
+    glEnd();
+}
+
+int main(int argc, char** argv)
+{
+    int x, y, width;
+    GLuint texture;
+
+    glfwSetErrorCallback(error_callback);
+
+    if (!glfwInit())
+        exit(EXIT_FAILURE);
+
+    windows[0] = open_window("First", NULL, OFFSET, OFFSET);
+    if (!windows[0])
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    // This is the one and only time we create a texture
+    // It is created inside the first context, created above
+    // It will then be shared with the second context, created below
+    texture = create_texture();
+
+    glfwGetWindowPos(windows[0], &x, &y);
+    glfwGetWindowSize(windows[0], &width, NULL);
+
+    // Put the second window to the right of the first one
+    windows[1] = open_window("Second", windows[0], x + width + OFFSET, y);
+    if (!windows[1])
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    // Set drawing color for both contexts
+    glfwMakeContextCurrent(windows[0]);
+    glColor3f(0.6f, 0.f, 0.6f);
+    glfwMakeContextCurrent(windows[1]);
+    glColor3f(0.6f, 0.6f, 0.f);
+
+    glfwMakeContextCurrent(windows[0]);
+
+    while (!glfwWindowShouldClose(windows[0]) &&
+           !glfwWindowShouldClose(windows[1]))
+    {
+        glfwMakeContextCurrent(windows[0]);
+        draw_quad(texture);
+
+        glfwMakeContextCurrent(windows[1]);
+        draw_quad(texture);
+
+        glfwSwapBuffers(windows[0]);
+        glfwSwapBuffers(windows[1]);
+
+        glfwWaitEvents();
+    }
+
+    glfwTerminate();
+    exit(EXIT_SUCCESS);
+}
+