Provide interface to export canvas to openGL.

1 files changed, 310 insertions, 0 deletions

diff --git a/tests/gl.c b/tests/gl.c
new file mode 100644
index 0000000..773a9aa
--- /dev/null
+++ b/tests/gl.c
@@ -0,0 +1,310 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of The Dimension Test Suite.                        *
+ *                                                                       *
+ * Dimension is free software; you can redistribute it and/or modify it  *
+ * under the terms of the GNU Lesser General Public License as published *
+ * by the Free Software Foundation; either version 3 of the License, or  *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * Dimension is distributed in the hope that it will be useful, but      *
+ * WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+#include "tests.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <GL/glx.h>
+#include <GL/gl.h>
+
+typedef struct {
+  Display *dpy;
+  Window win;
+  Colormap cmap;
+  GLXContext cx;
+  XEvent event;
+} dmnsn_display;
+
+dmnsn_display *dmnsn_new_display(const dmnsn_canvas *canvas);
+void dmnsn_delete_display(dmnsn_display *display);
+
+void dmnsn_display_frame(dmnsn_display *display);
+
+int
+main() {
+  dmnsn_display *display;
+  dmnsn_progress *progress;
+  dmnsn_scene *scene;
+  dmnsn_object *sphere, *cube;
+  dmnsn_sRGB sRGB;
+  dmnsn_color color;
+  dmnsn_matrix trans;
+  unsigned int i;
+
+  /* Set the resilience low for tests */
+  dmnsn_set_resilience(DMNSN_SEVERITY_LOW);
+
+  /* Allocate our new scene */
+  scene = dmnsn_new_scene();
+  if (!scene) {
+    fprintf(stderr, "--- Allocation of scene failed! ---\n");
+    return EXIT_FAILURE;
+  }
+
+  /* Allocate a canvas */
+  scene->canvas = dmnsn_new_canvas(768, 480);
+  if (!scene->canvas) {
+    dmnsn_delete_scene(scene);
+    fprintf(stderr, "--- Allocation of canvas failed! ---\n");
+    return EXIT_FAILURE;
+  }
+
+  /* Set up the transformation matrix for the perspective camera */
+  trans = dmnsn_scale_matrix(
+    dmnsn_vector_construct(
+      ((double)scene->canvas->x)/scene->canvas->y, 1.0, 1.0
+    )
+  );
+  trans = dmnsn_matrix_mul(
+    dmnsn_translation_matrix(dmnsn_vector_construct(0.0, 0.0, -4.0)),
+    trans
+  );
+  trans = dmnsn_matrix_mul(
+    dmnsn_rotation_matrix(dmnsn_vector_construct(0.0, 1.0, 0.0)),
+    trans
+  );
+
+  /* Create a perspective camera */
+  scene->camera = dmnsn_new_perspective_camera(trans);
+  if (!scene->camera) {
+    dmnsn_delete_canvas(scene->canvas);
+    dmnsn_delete_scene(scene);
+    fprintf(stderr, "--- Allocation of camera failed! ---\n");
+    return EXIT_FAILURE;
+  }
+
+  /* Background color */
+  sRGB.R = 0.0;
+  sRGB.G = 0.0;
+  sRGB.B = 0.1;
+  color = dmnsn_color_from_sRGB(sRGB);
+  color.filter = 0.1;
+  scene->background = color;
+
+  /* Now make our objects */
+
+  sphere = dmnsn_new_sphere();
+  if (!sphere) {
+    dmnsn_delete_perspective_camera(scene->camera);
+    dmnsn_delete_canvas(scene->canvas);
+    dmnsn_delete_scene(scene);
+    fprintf(stderr, "--- Allocation of sphere failed! ---\n");
+    return EXIT_FAILURE;
+  }
+
+  sphere->trans = dmnsn_matrix_inverse(
+    dmnsn_scale_matrix(dmnsn_vector_construct(1.25, 1.25, 1.25))
+  );
+  dmnsn_array_push(scene->objects, &sphere);
+
+  cube = dmnsn_new_cube();
+  if (!cube) {
+    dmnsn_delete_sphere(sphere);
+    dmnsn_delete_perspective_camera(scene->camera);
+    dmnsn_delete_canvas(scene->canvas);
+    dmnsn_delete_scene(scene);
+    fprintf(stderr, "--- Allocation of cube failed! ---\n");
+    return EXIT_FAILURE;
+  }
+
+  cube->trans = dmnsn_matrix_inverse(
+    dmnsn_rotation_matrix(dmnsn_vector_construct(0.75, 0.0, 0.0))
+  );
+  dmnsn_array_push(scene->objects, &cube);
+
+  display = dmnsn_new_display(scene->canvas);
+  if (!display) {
+    dmnsn_delete_cube(cube);
+    dmnsn_delete_sphere(sphere);
+    dmnsn_delete_perspective_camera(scene->camera);
+    dmnsn_delete_canvas(scene->canvas);
+    dmnsn_delete_scene(scene);
+    fprintf(stderr, "--- Couldn't initialize X or GLX! ---\n");
+    return EXIT_FAILURE;
+  }
+
+  for (i = 0; i < 48; ++i) {
+    progress = dmnsn_raytrace_scene_async(scene);
+    if (!progress) {
+      dmnsn_delete_display(display);
+      dmnsn_delete_cube(cube);
+      dmnsn_delete_sphere(sphere);
+      dmnsn_delete_perspective_camera(scene->camera);
+      dmnsn_delete_canvas(scene->canvas);
+      dmnsn_delete_scene(scene);
+      fprintf(stderr, "--- Couldn't start raytracing worker thread! ---\n");
+      return EXIT_FAILURE;
+    }
+
+    progressbar("Raytracing scene: ", progress);
+
+    if (dmnsn_finish_progress(progress) != 0) {
+      dmnsn_delete_display(display);
+      dmnsn_delete_cube(cube);
+      dmnsn_delete_sphere(sphere);
+      dmnsn_delete_perspective_camera(scene->camera);
+      dmnsn_delete_canvas(scene->canvas);
+      dmnsn_delete_scene(scene);
+      fprintf(stderr, "--- Raytracing failed! ---\n");
+      return EXIT_FAILURE;
+    }
+
+    if (dmnsn_gl_write_canvas(scene->canvas) != 0) {
+      dmnsn_delete_display(display);
+      dmnsn_delete_cube(cube);
+      dmnsn_delete_sphere(sphere);
+      dmnsn_delete_perspective_camera(scene->camera);
+      dmnsn_delete_canvas(scene->canvas);
+      dmnsn_delete_scene(scene);
+      fprintf(stderr, "--- Drawing to openGL failed! ---\n");
+      return EXIT_FAILURE;
+    }
+    dmnsn_display_frame(display);
+
+    /* Rotate the cube and camera for the next frame */
+
+    cube->trans = dmnsn_matrix_mul(
+      dmnsn_matrix_inverse(
+        dmnsn_rotation_matrix(dmnsn_vector_construct(0.025, 0.0, 0.0))
+      ),
+      cube->trans
+    );
+
+    trans = dmnsn_matrix_mul(
+      dmnsn_rotation_matrix(dmnsn_vector_construct(0.0, -0.05, 0.0)),
+      trans
+    );
+    dmnsn_set_perspective_camera_trans(scene->camera, trans);
+  }
+
+  dmnsn_delete_display(display);
+  dmnsn_delete_cube(cube);
+  dmnsn_delete_sphere(sphere);
+  dmnsn_delete_perspective_camera(scene->camera);
+  dmnsn_delete_canvas(scene->canvas);
+  dmnsn_delete_scene(scene);
+  return EXIT_SUCCESS;
+}
+
+static Bool
+WaitForNotify(Display *d, XEvent *e, char *arg)
+{
+  return (e->type == MapNotify) && (e->xmap.window == (Window)arg);
+}
+
+dmnsn_display *
+dmnsn_new_display(const dmnsn_canvas *canvas)
+{
+  int attributeList[] = {
+    GLX_RGBA,
+    GLX_DOUBLEBUFFER,
+    GLX_RED_SIZE, 1,
+    GLX_GREEN_SIZE, 1,
+    GLX_BLUE_SIZE, 1,
+    None
+  };
+  dmnsn_display *display;
+  XVisualInfo *vi;
+  XSetWindowAttributes swa;
+
+  display = malloc(sizeof(dmnsn_display));
+  if (!display) {
+    return NULL;
+  }
+
+  /* Get an X connection */
+  display->dpy = XOpenDisplay(0);
+  if (!display->dpy) {
+    free(display);
+    return NULL;
+  }
+
+  /* Get an appropriate visual */
+  vi = glXChooseVisual(display->dpy, DefaultScreen(display->dpy),
+                       attributeList);
+  if (!vi) {
+    XCloseDisplay(display->dpy);
+    free(display);
+    return NULL;
+  }
+
+  /* Create a GLX context */
+  display->cx = glXCreateContext(display->dpy, vi, 0, GL_TRUE);
+  if (!display->cx) {
+    XCloseDisplay(display->dpy);
+    free(display);
+    return NULL;
+  }
+
+  /* Create a color map */
+  display->cmap = XCreateColormap(display->dpy,
+                                  RootWindow(display->dpy, vi->screen),
+                                  vi->visual, AllocNone);
+  if (!display->cmap) {
+    glXDestroyContext(display->dpy, display->cx);
+    XCloseDisplay(display->dpy);
+    free(display);
+    return NULL;
+  }
+
+  /* Create a window */
+  swa.colormap = display->cmap;
+  swa.border_pixel = 0;
+  swa.event_mask = StructureNotifyMask;
+  display->win = XCreateWindow(display->dpy,
+                               RootWindow(display->dpy, vi->screen),
+                               0, 0, canvas->x, canvas->y,
+                               0, vi->depth, InputOutput, vi->visual,
+                               CWBorderPixel|CWColormap|CWEventMask, &swa);
+  if (!display->win) {
+    XFreeColormap(display->dpy, display->cmap);
+    glXDestroyContext(display->dpy, display->cx);
+    XCloseDisplay(display->dpy);
+    free(display);
+    return NULL;
+  }
+
+  XMapWindow(display->dpy, display->win);
+  XIfEvent(display->dpy, &display->event, WaitForNotify, (char*)display->win);
+
+  /* Connect the context to the window */
+  glXMakeCurrent(display->dpy, display->win, display->cx);
+
+  return display;
+}
+
+void
+dmnsn_delete_display(dmnsn_display *display)
+{
+  if (display) {
+    XDestroyWindow(display->dpy, display->win);
+    XFreeColormap(display->dpy, display->cmap);
+    glXDestroyContext(display->dpy, display->cx);
+    XCloseDisplay(display->dpy);
+    free(display);
+  }
+}
+
+void
+dmnsn_display_frame(dmnsn_display *display)
+{
+  glFlush();
+  glXSwapBuffers(display->dpy, display->win);
+}