forked from AuroraMiddleware/gtk
fbe4f94519
Use G_PI in place of M_PI to fix the build on compilers that do not have M_PI defined. https://bugzilla.gnome.org/show_bug.cgi?id=740795
440 lines
13 KiB
C
440 lines
13 KiB
C
/* The rendering code in here is taken from glxgears, which has the
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* following copyright notice:
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*
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* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <math.h>
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#include <epoxy/gl.h>
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#include "gtkgears.h"
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typedef struct {
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GLfloat view_rot[GTK_GEARS_N_AXIS];
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GLint gear1, gear2, gear3;
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GLfloat angle;
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gint64 first_frame_time;
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guint tick;
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GtkLabel *fps_label;
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} GtkGearsPrivate;
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G_DEFINE_TYPE_WITH_PRIVATE (GtkGears, gtk_gears, GTK_TYPE_GL_AREA);
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static gboolean gtk_gears_render (GtkGLArea *area,
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GdkGLContext *context);
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static void gtk_gears_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation);
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static void gtk_gears_realize (GtkWidget *widget);
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static gboolean gtk_gears_tick (GtkWidget *widget,
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GdkFrameClock *frame_clock,
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gpointer user_data);
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GtkWidget *
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gtk_gears_new (void)
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{
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GtkWidget *gears;
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gears = g_object_new (gtk_gears_get_type (),
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"has-depth-buffer", TRUE,
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NULL);
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return gears;
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}
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static void
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gtk_gears_init (GtkGears *gears)
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{
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GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears);
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priv->view_rot[GTK_GEARS_X_AXIS] = 20.0;
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priv->view_rot[GTK_GEARS_Y_AXIS] = 30.0;
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priv->view_rot[GTK_GEARS_Z_AXIS] = 20.0;
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priv->tick = gtk_widget_add_tick_callback (GTK_WIDGET (gears), gtk_gears_tick, gears, NULL);
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}
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static void
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gtk_gears_finalize (GObject *obj)
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{
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GtkGears *gears = GTK_GEARS (obj);
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GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears);
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gtk_widget_remove_tick_callback (GTK_WIDGET (gears), priv->tick);
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g_clear_object (&priv->fps_label);
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G_OBJECT_CLASS (gtk_gears_parent_class)->finalize (obj);
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}
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static void
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gtk_gears_class_init (GtkGearsClass *klass)
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{
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GTK_GL_AREA_CLASS (klass)->render = gtk_gears_render;
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GTK_WIDGET_CLASS (klass)->realize = gtk_gears_realize;
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GTK_WIDGET_CLASS (klass)->size_allocate = gtk_gears_size_allocate;
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G_OBJECT_CLASS (klass)->finalize = gtk_gears_finalize;
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}
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/*
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*
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* Draw a gear wheel. You'll probably want to call this function when
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* building a display list since we do a lot of trig here.
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*
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* Input: inner_radius - radius of hole at center
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* outer_radius - radius at center of teeth
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* width - width of gear
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* teeth - number of teeth
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* tooth_depth - depth of tooth
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*/
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static void
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gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
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GLint teeth, GLfloat tooth_depth)
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{
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GLint i;
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GLfloat r0, r1, r2;
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GLfloat angle, da;
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GLfloat u, v, len;
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r0 = inner_radius;
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r1 = outer_radius - tooth_depth / 2.0;
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r2 = outer_radius + tooth_depth / 2.0;
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da = 2.0 * G_PI / teeth / 4.0;
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glShadeModel(GL_FLAT);
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glNormal3f(0.0, 0.0, 1.0);
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/* draw front face */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * G_PI / teeth;
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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if (i < teeth) {
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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width * 0.5);
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}
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}
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glEnd();
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/* draw front sides of teeth */
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glBegin(GL_QUADS);
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da = 2.0 * G_PI / teeth / 4.0;
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * G_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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width * 0.5);
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}
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glEnd();
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glNormal3f(0.0, 0.0, -1.0);
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/* draw back face */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * G_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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if (i < teeth) {
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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-width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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}
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}
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glEnd();
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/* draw back sides of teeth */
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glBegin(GL_QUADS);
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da = 2.0 * G_PI / teeth / 4.0;
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * G_PI / teeth;
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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-width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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-width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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}
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glEnd();
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/* draw outward faces of teeth */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * G_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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u = r2 * cos(angle + da) - r1 * cos(angle);
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v = r2 * sin(angle + da) - r1 * sin(angle);
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len = sqrt(u * u + v * v);
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u /= len;
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v /= len;
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glNormal3f(v, -u, 0.0);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
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glNormal3f(cos(angle), sin(angle), 0.0);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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-width * 0.5);
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u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
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v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
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glNormal3f(v, -u, 0.0);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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-width * 0.5);
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glNormal3f(cos(angle), sin(angle), 0.0);
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}
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glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
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glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
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glEnd();
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glShadeModel(GL_SMOOTH);
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/* draw inside radius cylinder */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * G_PI / teeth;
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glNormal3f(-cos(angle), -sin(angle), 0.0);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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}
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glEnd();
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}
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/* new window size or exposure */
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static void
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reshape(int width, int height)
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{
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GLfloat h = (GLfloat) height / (GLfloat) width;
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -40.0);
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}
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static gboolean
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gtk_gears_render (GtkGLArea *area,
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GdkGLContext *context)
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{
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GtkGearsPrivate *priv = gtk_gears_get_instance_private (GTK_GEARS (area));
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glPushMatrix();
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glRotatef(priv->view_rot[GTK_GEARS_X_AXIS], 1.0, 0.0, 0.0);
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glRotatef(priv->view_rot[GTK_GEARS_Y_AXIS], 0.0, 1.0, 0.0);
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glRotatef(priv->view_rot[GTK_GEARS_Z_AXIS], 0.0, 0.0, 1.0);
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glPushMatrix();
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glTranslatef(-3.0, -2.0, 0.0);
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glRotatef(priv->angle, 0.0, 0.0, 1.0);
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glCallList(priv->gear1);
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glPopMatrix();
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glPushMatrix();
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glTranslatef(3.1, -2.0, 0.0);
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glRotatef(-2.0 * priv->angle - 9.0, 0.0, 0.0, 1.0);
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glCallList(priv->gear2);
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glPopMatrix();
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glPushMatrix();
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glTranslatef(-3.1, 4.2, 0.0);
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glRotatef(-2.0 * priv->angle - 25.0, 0.0, 0.0, 1.0);
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glCallList(priv->gear3);
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glPopMatrix();
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glPopMatrix();
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return TRUE;
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}
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static void
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gtk_gears_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation)
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{
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GtkGLArea *glarea = GTK_GL_AREA (widget);
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GTK_WIDGET_CLASS (gtk_gears_parent_class)->size_allocate (widget, allocation);
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if (gtk_widget_get_realized (widget))
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{
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gtk_gl_area_make_current (glarea);
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reshape (allocation->width, allocation->height);
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}
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}
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static void
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gtk_gears_realize (GtkWidget *widget)
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{
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GtkGLArea *glarea = GTK_GL_AREA (widget);
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GtkGears *gears = GTK_GEARS(widget);
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GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears);
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GtkAllocation allocation;
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static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 };
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static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
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static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
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static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
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GTK_WIDGET_CLASS (gtk_gears_parent_class)->realize (widget);
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gtk_gl_area_make_current (glarea);
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glLightfv(GL_LIGHT0, GL_POSITION, pos);
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glEnable(GL_CULL_FACE);
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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glEnable(GL_DEPTH_TEST);
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/* make the gears */
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priv->gear1 = glGenLists(1);
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glNewList(priv->gear1, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
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gear(1.0, 4.0, 1.0, 20, 0.7);
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glEndList();
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priv->gear2 = glGenLists(1);
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glNewList(priv->gear2, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
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gear(0.5, 2.0, 2.0, 10, 0.7);
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glEndList();
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priv->gear3 = glGenLists(1);
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glNewList(priv->gear3, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
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gear(1.3, 2.0, 0.5, 10, 0.7);
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glEndList();
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glEnable(GL_NORMALIZE);
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gtk_widget_get_allocation (widget, &allocation);
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reshape (allocation.width, allocation.height);
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}
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static gboolean
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gtk_gears_tick (GtkWidget *widget,
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GdkFrameClock *frame_clock,
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gpointer user_data)
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{
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GtkGears *gears = GTK_GEARS (widget);
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GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears);
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GdkFrameTimings *timings, *previous_timings;
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gint64 previous_frame_time = 0;
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gint64 frame_time;
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gint64 history_start, history_len;
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gint64 frame;
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char *s;
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frame = gdk_frame_clock_get_frame_counter (frame_clock);
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frame_time = gdk_frame_clock_get_frame_time (frame_clock);
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if (priv->first_frame_time == 0)
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{
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/* No need for changes on first frame */
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priv->first_frame_time = frame_time;
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if (priv->fps_label)
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gtk_label_set_label (priv->fps_label, "FPS: ---");
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return G_SOURCE_CONTINUE;
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}
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/* glxgears advances 70 degrees per second, so do the same */
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priv->angle = fmod ((frame_time - priv->first_frame_time) / (double)G_USEC_PER_SEC * 70.0, 360.0);
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gtk_widget_queue_draw (widget);
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history_start = gdk_frame_clock_get_history_start (frame_clock);
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if (priv->fps_label && frame % 60 == 0)
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{
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history_len = frame - history_start;
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if (history_len > 0)
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{
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previous_timings = gdk_frame_clock_get_timings (frame_clock, frame - history_len);
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previous_frame_time = gdk_frame_timings_get_frame_time (previous_timings);
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s = g_strdup_printf ("FPS: %-4.1f", (G_USEC_PER_SEC * history_len) / (double)(frame_time - previous_frame_time));
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gtk_label_set_label (priv->fps_label, s);
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g_free (s);
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}
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}
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timings = gdk_frame_clock_get_current_timings (frame_clock);
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previous_timings = gdk_frame_clock_get_timings (frame_clock,
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gdk_frame_timings_get_frame_counter (timings) - 1);
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if (previous_timings != NULL)
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previous_frame_time = gdk_frame_timings_get_frame_time (previous_timings);
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return G_SOURCE_CONTINUE;
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}
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void
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gtk_gears_set_axis (GtkGears *gears, int axis, double value)
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{
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GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears);
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if (axis < 0 || axis >= GTK_GEARS_N_AXIS)
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return;
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priv->view_rot[axis] = value;
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gtk_widget_queue_draw (GTK_WIDGET (gears));
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}
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double
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gtk_gears_get_axis (GtkGears *gears, int axis)
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{
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GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears);
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if (axis < 0 || axis >= GTK_GEARS_N_AXIS)
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return 0.0;
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return priv->view_rot[axis];
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}
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void
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gtk_gears_set_fps_label (GtkGears *gears, GtkLabel *label)
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{
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GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears);
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if (label)
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g_object_ref (label);
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g_clear_object (&priv->fps_label);
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priv->fps_label = label;
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}
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