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-rw-r--r--libdimension/Makefile.am4
-rw-r--r--libdimension/dimension.h1
-rw-r--r--libdimension/dimension/gl.h37
-rw-r--r--libdimension/gl.c91
-rw-r--r--tests/Makefile.am26
-rw-r--r--tests/gl.c310
6 files changed, 457 insertions, 12 deletions
diff --git a/libdimension/Makefile.am b/libdimension/Makefile.am
index 16bf4a7..7a18535 100644
--- a/libdimension/Makefile.am
+++ b/libdimension/Makefile.am
@@ -25,6 +25,7 @@ nobase_include_HEADERS = dimension.h \
dimension/color.h \
dimension/error.h \
dimension/geometry.h \
+ dimension/gl.h \
dimension/png.h \
dimension/progress.h \
dimension/object.h \
@@ -41,6 +42,7 @@ libdimension_la_SOURCES = $(nobase_include_HEADERS) \
color.c \
error.c \
geometry.c \
+ gl.c \
inlines.c \
png.c \
progress.c \
@@ -49,4 +51,4 @@ libdimension_la_SOURCES = $(nobase_include_HEADERS) \
raytrace.c \
scene.c
libdimension_la_LDFLAGS = -version-info 0:0:0
-libdimension_la_LIBADD = -lm -lpthread -lpng
+libdimension_la_LIBADD = -lm -lpthread -lpng -lGL
diff --git a/libdimension/dimension.h b/libdimension/dimension.h
index 5734616..869b959 100644
--- a/libdimension/dimension.h
+++ b/libdimension/dimension.h
@@ -57,6 +57,7 @@ extern "C" {
#include <dimension/geometry.h>
#include <dimension/color.h>
#include <dimension/canvas.h>
+#include <dimension/gl.h>
#include <dimension/png.h>
#include <dimension/object.h>
#include <dimension/objects.h>
diff --git a/libdimension/dimension/gl.h b/libdimension/dimension/gl.h
new file mode 100644
index 0000000..e27c418
--- /dev/null
+++ b/libdimension/dimension/gl.h
@@ -0,0 +1,37 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
+ * *
+ * This file is part of The Dimension Library. *
+ * *
+ * The Dimension Library 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. *
+ * *
+ * The Dimension Library 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/>. *
+ *************************************************************************/
+
+/*
+ * Draw a canvas to a GL framebuffer with glDrawPixels, or read one with
+ * glReadPixels. Should be fast, so no _async() versions.
+ */
+
+#ifndef DIMENSION_GL_H
+#define DIMENSION_GL_H
+
+#include <stdio.h>
+
+/* Write canvas to GL framebuffer. Returns 0 on success, nonzero on failure */
+int dmnsn_gl_write_canvas(const dmnsn_canvas *canvas);
+
+/* Read a canvas from a GL framebuffer. Returns NULL on failure. */
+dmnsn_canvas *dmnsn_gl_read_canvas();
+
+#endif /* DIMENSION_GL_H */
diff --git a/libdimension/gl.c b/libdimension/gl.c
new file mode 100644
index 0000000..3542a2d
--- /dev/null
+++ b/libdimension/gl.c
@@ -0,0 +1,91 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
+ * *
+ * This file is part of The Dimension Library. *
+ * *
+ * The Dimension Library 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. *
+ * *
+ * The Dimension Library 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 "dimension.h"
+#include <GL/gl.h>
+
+/* Write canvas to GL framebuffer. Returns 0 on success, nonzero on failure */
+int
+dmnsn_gl_write_canvas(const dmnsn_canvas *canvas)
+{
+ GLuint *pixels; /* Array of 32-bit ints in RGBA order */
+ GLuint *pixel;
+ dmnsn_sRGB sRGB;
+ dmnsn_color color;
+ unsigned int x, y, width, height;
+
+ width = canvas->x;
+ height = canvas->y;
+
+ pixels = malloc(4*width*height*sizeof(GLuint));
+ if (!pixels) {
+ return 1;
+ }
+
+ for (y = 0; y < height; ++y) {
+ for (x = 0; x < width; ++x) {
+ pixel = pixels + 4*(y*width + x);
+
+ color = dmnsn_get_pixel(canvas, x, y);
+ sRGB = dmnsn_sRGB_from_color(color);
+
+ /* Saturate R, G, and B to [0, UINT32_MAX] */
+
+ if (sRGB.R <= 0.0) {
+ pixel[0] = 0;
+ } else if (sRGB.R >= 1.0) {
+ pixel[0] = UINT32_MAX;
+ } else {
+ pixel[0] = sRGB.R*UINT32_MAX;
+ }
+
+ if (sRGB.G <= 0.0) {
+ pixel[1] = 0;
+ } else if (sRGB.G >= 1.0) {
+ pixel[1] = UINT32_MAX;
+ } else {
+ pixel[1] = sRGB.G*UINT32_MAX;
+ }
+
+ if (sRGB.B <= 0.0) {
+ pixel[2] = 0;
+ } else if (sRGB.B >= 1.0) {
+ pixel[2] = UINT32_MAX;
+ } else {
+ pixel[2] = sRGB.B*UINT32_MAX;
+ }
+
+ /* color.filter + color.trans is in [0.0, 1.0] by definition */
+ pixel[3] = (color.filter + color.trans)*UINT32_MAX;
+ }
+ }
+
+ glDrawPixels(width, height, GL_RGBA, GL_UNSIGNED_INT, pixels);
+
+ free(pixels);
+ return 0;
+}
+
+/* Read a canvas from a GL framebuffer. Returns NULL on failure. */
+dmnsn_canvas *
+dmnsn_gl_read_canvas()
+{
+ return NULL;
+}
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 9e6fda4..6d496f6 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -24,7 +24,8 @@ check_PROGRAMS = warning-test \
png-test \
pngxx-test \
raytrace-test \
- raytracexx-test
+ raytracexx-test \
+ gl-test
TESTS = $(check_PROGRAMS)
XFAIL_TESTS = error-test
@@ -38,20 +39,23 @@ libdimensionxx_tests_la_SOURCES = testsxx.hpp \
testsxx.cpp
libdimensionxx_tests_la_LIBADD = ../libdimensionxx/libdimensionxx.la
-warning_test_SOURCES = warning.c
-warning_test_LDADD = ./libdimension-tests.la
+warning_test_SOURCES = warning.c
+warning_test_LDADD = ./libdimension-tests.la
-error_test_SOURCES = error.c
-error_test_LDADD = ./libdimension-tests.la
+error_test_SOURCES = error.c
+error_test_LDADD = ./libdimension-tests.la
-png_test_SOURCES = png.c
-png_test_LDADD = ./libdimension-tests.la
+png_test_SOURCES = png.c
+png_test_LDADD = ./libdimension-tests.la
-pngxx_test_SOURCES = pngxx.cpp
-pngxx_test_LDADD = ./libdimensionxx-tests.la
+pngxx_test_SOURCES = pngxx.cpp
+pngxx_test_LDADD = ./libdimensionxx-tests.la
-raytrace_test_SOURCES = raytrace.c
-raytrace_test_LDADD = ./libdimension-tests.la
+raytrace_test_SOURCES = raytrace.c
+raytrace_test_LDADD = ./libdimension-tests.la
raytracexx_test_SOURCES = raytracexx.cpp
raytracexx_test_LDADD = ./libdimensionxx-tests.la
+
+gl_test_SOURCES = gl.c
+gl_test_LDADD = ./libdimension-tests.la
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);
+}
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