Bug Summary

File:tests/ctkgears.c
Warning:line 924, column 5
Value stored to 'previous_frame_time' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name ctkgears.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/rootdir/tests -fcoverage-compilation-dir=/rootdir/tests -resource-dir /usr/lib/llvm-19/lib/clang/19 -D HAVE_CONFIG_H -I . -I .. -I .. -I ../cdk -I ../cdk -D G_ENABLE_DEBUG -D G_ENABLE_CONSISTENCY_CHECKS -D GLIB_MIN_REQUIRED_VERSION=GLIB_VERSION_2_66 -D GLIB_MAX_ALLOWED_VERSION=GLIB_VERSION_2_66 -I /usr/include/pango-1.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/harfbuzz -I /usr/include/freetype2 -I /usr/include/libpng16 -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/fribidi -I /usr/include/cairo -I /usr/include/pixman-1 -I /usr/include/atk-1.0 -I /usr/include/gdk-pixbuf-2.0 -I /usr/include/x86_64-linux-gnu -I /usr/include/webp -I /usr/include/at-spi2-atk/2.0 -I /usr/include/at-spi-2.0 -I /usr/include/dbus-1.0 -I /usr/lib/x86_64-linux-gnu/dbus-1.0/include -I /usr/include/gio-unix-2.0 -I /usr/include/harfbuzz -I /usr/include/freetype2 -I /usr/include/libpng16 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/pango-1.0 -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/fribidi -I /usr/include/cairo -I /usr/include/pixman-1 -I /usr/include/pango-1.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/harfbuzz -I /usr/include/freetype2 -I /usr/include/libpng16 -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/fribidi -I /usr/include/cairo -I /usr/include/pixman-1 -I /usr/include/gdk-pixbuf-2.0 -I /usr/include/x86_64-linux-gnu -I /usr/include/webp -I /usr/include/gio-unix-2.0 -internal-isystem /usr/lib/llvm-19/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/15/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -analyzer-checker deadcode.DeadStores -analyzer-checker alpha.deadcode.UnreachableCode -analyzer-checker alpha.core.CastSize -analyzer-checker alpha.core.CastToStruct -analyzer-checker alpha.core.IdenticalExpr -analyzer-checker alpha.security.ArrayBoundV2 -analyzer-checker alpha.security.MallocOverflow -analyzer-checker alpha.security.ReturnPtrRange -analyzer-checker alpha.unix.SimpleStream -analyzer-checker alpha.unix.cstring.BufferOverlap -analyzer-checker alpha.unix.cstring.NotNullTerminated -analyzer-checker alpha.unix.cstring.OutOfBounds -analyzer-checker alpha.core.FixedAddr -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /rootdir/html-report/2025-12-07-153603-43976-1 -x c ctkgears.c
1/* The rendering code in here is taken from es2gears, which has the
2 * following copyright notice:
3 *
4 * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
20 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Ported to GLES2.
24 * Kristian Høgsberg <krh@bitplanet.net>
25 * May 3, 2010
26 *
27 * Improve GLES2 port:
28 * * Refactor gear drawing.
29 * * Use correct normals for surfaces.
30 * * Improve shader.
31 * * Use perspective projection transformation.
32 * * Add FPS count.
33 * * Add comments.
34 * Alexandros Frantzis <alexandros.frantzis@linaro.org>
35 * Jul 13, 2010
36 */
37
38#include "config.h"
39
40#include <math.h>
41#include <stdlib.h>
42#include <string.h>
43#include <epoxy/gl.h>
44
45#include "ctkgears.h"
46
47#define STRIPS_PER_TOOTH7 7
48#define VERTICES_PER_TOOTH34 34
49#define GEAR_VERTEX_STRIDE6 6
50
51#ifndef HAVE_SINCOS1
52static void
53sincos (double x, double *_sin, double *_cos)
54{
55 *_sin = sin (x);
56 *_cos = cos (x);
57}
58#endif
59
60/**
61 * Struct describing the vertices in triangle strip
62 */
63struct vertex_strip {
64 /** The first vertex in the strip */
65 GLint first;
66 /** The number of consecutive vertices in the strip after the first */
67 GLint count;
68};
69
70/* Each vertex consist of GEAR_VERTEX_STRIDE GLfloat attributes */
71typedef GLfloat GearVertex[GEAR_VERTEX_STRIDE6];
72
73/**
74 * Struct representing a gear.
75 */
76struct gear {
77 /** The array of vertices comprising the gear */
78 GearVertex *vertices;
79 /** The number of vertices comprising the gear */
80 int nvertices;
81 /** The array of triangle strips comprising the gear */
82 struct vertex_strip *strips;
83 /** The number of triangle strips comprising the gear */
84 int nstrips;
85};
86
87typedef struct {
88 /* The view rotation [x, y, z] */
89 GLfloat view_rot[CTK_GEARS_N_AXIS];
90
91 /* The Vertex Array Object */
92 GLuint vao;
93
94 /* The shader program */
95 GLuint program;
96
97 /* The gears */
98 struct gear *gear1;
99 struct gear *gear2;
100 struct gear *gear3;
101
102 /** The Vertex Buffer Object holding the vertices in the graphics card */
103 GLuint gear_vbo[3];
104
105 /** The location of the shader uniforms */
106 GLuint ModelViewProjectionMatrix_location;
107 GLuint NormalMatrix_location;
108 GLuint LightSourcePosition_location;
109 GLuint MaterialColor_location;
110
111 /* The current gear rotation angle */
112 GLfloat angle;
113
114 /* The projection matrix */
115 GLfloat ProjectionMatrix[16];
116
117 /* The direction of the directional light for the scene */
118 GLfloat LightSourcePosition[4];
119
120 gint64 first_frame_time;
121 guint tick;
122 CtkLabel *fps_label;
123} CtkGearsPrivate;
124
125G_DEFINE_TYPE_WITH_PRIVATE (CtkGears, ctk_gears, CTK_TYPE_GL_AREA)static void ctk_gears_init (CtkGears *self); static void ctk_gears_class_init
(CtkGearsClass *klass); static GType ctk_gears_get_type_once
(void); static gpointer ctk_gears_parent_class = ((void*)0);
static gint CtkGears_private_offset; static void ctk_gears_class_intern_init
(gpointer klass) { ctk_gears_parent_class = g_type_class_peek_parent
(klass); if (CtkGears_private_offset != 0) g_type_class_adjust_private_offset
(klass, &CtkGears_private_offset); ctk_gears_class_init (
(CtkGearsClass*) klass); } __attribute__ ((__unused__)) static
inline gpointer ctk_gears_get_instance_private (CtkGears *self
) { return (((gpointer) ((guint8*) (self) + (glong) (CtkGears_private_offset
)))); } GType ctk_gears_get_type (void) { static GType static_g_define_type_id
= 0; if ((__extension__ ({ _Static_assert (sizeof *(&static_g_define_type_id
) == sizeof (gpointer), "Expression evaluates to false"); (void
) (0 ? (gpointer) * (&static_g_define_type_id) : ((void*)
0)); (!(__extension__ ({ _Static_assert (sizeof *(&static_g_define_type_id
) == sizeof (gpointer), "Expression evaluates to false"); __typeof__
(*(&static_g_define_type_id)) gapg_temp_newval; __typeof__
((&static_g_define_type_id)) gapg_temp_atomic = (&static_g_define_type_id
); __atomic_load (gapg_temp_atomic, &gapg_temp_newval, 5)
; gapg_temp_newval; })) && g_once_init_enter_pointer (
&static_g_define_type_id)); })) ) { GType g_define_type_id
= ctk_gears_get_type_once (); (__extension__ ({ _Static_assert
(sizeof *(&static_g_define_type_id) == sizeof (gpointer)
, "Expression evaluates to false"); 0 ? (void) (*(&static_g_define_type_id
) = (g_define_type_id)) : (void) 0; g_once_init_leave_pointer
((&static_g_define_type_id), (gpointer) (guintptr) (g_define_type_id
)); })) ; } return static_g_define_type_id; } __attribute__ (
(__noinline__)) static GType ctk_gears_get_type_once (void) {
GType g_define_type_id = g_type_register_static_simple ((ctk_gl_area_get_type
()), g_intern_static_string ("CtkGears"), sizeof (CtkGearsClass
), (GClassInitFunc)(void (*)(void)) ctk_gears_class_intern_init
, sizeof (CtkGears), (GInstanceInitFunc)(void (*)(void)) ctk_gears_init
, (GTypeFlags) 0); { {{ CtkGears_private_offset = g_type_add_instance_private
(g_define_type_id, sizeof (CtkGearsPrivate)); };} } return g_define_type_id
; }
126
127static gboolean ctk_gears_render (CtkGLArea *area,
128 CdkGLContext *context);
129static void ctk_gears_reshape (CtkGLArea *area,
130 int width,
131 int height);
132static void ctk_gears_realize (CtkWidget *widget);
133static void ctk_gears_unrealize (CtkWidget *widget);
134static gboolean ctk_gears_tick (CtkWidget *widget,
135 CdkFrameClock *frame_clock,
136 gpointer user_data);
137
138static void destroy_gear (struct gear *g);
139
140CtkWidget *
141ctk_gears_new (void)
142{
143 return g_object_new (ctk_gears_get_type (),
144 "has-depth-buffer", TRUE(!(0)),
145 NULL((void*)0));
146}
147
148static void
149ctk_gears_init (CtkGears *gears)
150{
151 CtkGearsPrivate *priv = ctk_gears_get_instance_private (gears);
152
153 priv->view_rot[CTK_GEARS_X_AXIS] = 20.0;
154 priv->view_rot[CTK_GEARS_Y_AXIS] = 30.0;
155 priv->view_rot[CTK_GEARS_Z_AXIS] = 20.0;
156
157 priv->LightSourcePosition[0] = 5.0;
158 priv->LightSourcePosition[1] = 5.0;
159 priv->LightSourcePosition[2] = 10.0;
160 priv->LightSourcePosition[3] = 1.0;
161
162 priv->tick = ctk_widget_add_tick_callback (CTK_WIDGET (gears)((((CtkWidget*) (void *) g_type_check_instance_cast ((GTypeInstance
*) ((gears)), ((ctk_widget_get_type ())))))), ctk_gears_tick, gears, NULL((void*)0));
163}
164
165static void
166ctk_gears_finalize (GObject *obj)
167{
168 CtkGears *gears = CTK_GEARS (obj)((((CtkGears*) (void *) g_type_check_instance_cast ((GTypeInstance
*) ((obj)), ((ctk_gears_get_type ()))))));
169 CtkGearsPrivate *priv = ctk_gears_get_instance_private (gears);
170
171 ctk_widget_remove_tick_callback (CTK_WIDGET (gears)((((CtkWidget*) (void *) g_type_check_instance_cast ((GTypeInstance
*) ((gears)), ((ctk_widget_get_type ())))))), priv->tick);
172
173 g_clear_object (&priv->fps_label)do { _Static_assert (sizeof *((&priv->fps_label)) == sizeof
(gpointer), "Expression evaluates to false"); __typeof__ (((
&priv->fps_label))) _pp = ((&priv->fps_label));
__typeof__ (*((&priv->fps_label))) _ptr = *_pp; *_pp =
((void*)0); if (_ptr) (g_object_unref) (_ptr); } while (0);
174
175 g_clear_pointer (&priv->gear1, destroy_gear)do { _Static_assert (sizeof *(&priv->gear1) == sizeof (
gpointer), "Expression evaluates to false"); __typeof__ ((&
priv->gear1)) _pp = (&priv->gear1); __typeof__ (*(&
priv->gear1)) _ptr = *_pp; *_pp = ((void*)0); if (_ptr) (destroy_gear
) (_ptr); } while (0);
176 g_clear_pointer (&priv->gear2, destroy_gear)do { _Static_assert (sizeof *(&priv->gear2) == sizeof (
gpointer), "Expression evaluates to false"); __typeof__ ((&
priv->gear2)) _pp = (&priv->gear2); __typeof__ (*(&
priv->gear2)) _ptr = *_pp; *_pp = ((void*)0); if (_ptr) (destroy_gear
) (_ptr); } while (0);
177 g_clear_pointer (&priv->gear3, destroy_gear)do { _Static_assert (sizeof *(&priv->gear3) == sizeof (
gpointer), "Expression evaluates to false"); __typeof__ ((&
priv->gear3)) _pp = (&priv->gear3); __typeof__ (*(&
priv->gear3)) _ptr = *_pp; *_pp = ((void*)0); if (_ptr) (destroy_gear
) (_ptr); } while (0);
178
179 G_OBJECT_CLASS (ctk_gears_parent_class)((((GObjectClass*) (void *) g_type_check_class_cast ((GTypeClass
*) ((ctk_gears_parent_class)), (((GType) ((20) << (2)))
)))))->finalize (obj);
180}
181
182static void
183ctk_gears_class_init (CtkGearsClass *klass)
184{
185 CTK_GL_AREA_CLASS (klass)((((CtkGLAreaClass*) (void *) g_type_check_class_cast ((GTypeClass
*) ((klass)), ((ctk_gl_area_get_type ()))))))->render = ctk_gears_render;
186 CTK_GL_AREA_CLASS (klass)((((CtkGLAreaClass*) (void *) g_type_check_class_cast ((GTypeClass
*) ((klass)), ((ctk_gl_area_get_type ()))))))->resize = ctk_gears_reshape;
187
188 CTK_WIDGET_CLASS (klass)((((CtkWidgetClass*) (void *) g_type_check_class_cast ((GTypeClass
*) ((klass)), ((ctk_widget_get_type ()))))))->realize = ctk_gears_realize;
189 CTK_WIDGET_CLASS (klass)((((CtkWidgetClass*) (void *) g_type_check_class_cast ((GTypeClass
*) ((klass)), ((ctk_widget_get_type ()))))))->unrealize = ctk_gears_unrealize;
190
191 G_OBJECT_CLASS (klass)((((GObjectClass*) (void *) g_type_check_class_cast ((GTypeClass
*) ((klass)), (((GType) ((20) << (2))))))))->finalize = ctk_gears_finalize;
192}
193
194/*
195 * Fills a gear vertex.
196 *
197 * @param v the vertex to fill
198 * @param x the x coordinate
199 * @param y the y coordinate
200 * @param z the z coortinate
201 * @param n pointer to the normal table
202 *
203 * @return the operation error code
204 */
205static GearVertex *
206vert (GearVertex *v,
207 GLfloat x,
208 GLfloat y,
209 GLfloat z,
210 GLfloat n[3])
211{
212 v[0][0] = x;
213 v[0][1] = y;
214 v[0][2] = z;
215 v[0][3] = n[0];
216 v[0][4] = n[1];
217 v[0][5] = n[2];
218
219 return v + 1;
220}
221
222static void
223destroy_gear (struct gear *g)
224{
225 g_free (g->strips);
226 g_free (g);
227}
228
229/**
230 * Create a gear wheel.
231 *
232 * @param inner_radius radius of hole at center
233 * @param outer_radius radius at center of teeth
234 * @param width width of gear
235 * @param teeth number of teeth
236 * @param tooth_depth depth of tooth
237 *
238 * @return pointer to the constructed struct gear
239 */
240static struct gear *
241create_gear (GLfloat inner_radius,
242 GLfloat outer_radius,
243 GLfloat width,
244 GLint teeth,
245 GLfloat tooth_depth)
246{
247 GLfloat r0, r1, r2;
248 GLfloat da;
249 GearVertex *v;
250 struct gear *gear;
251 double s[5], c[5];
252 GLfloat normal[3];
253 int cur_strip = 0;
254 int i;
255
256 /* Allocate memory for the gear */
257 gear = g_malloc (sizeof *gear);
258
259 /* Calculate the radii used in the gear */
260 r0 = inner_radius;
261 r1 = outer_radius - tooth_depth / 2.0;
262 r2 = outer_radius + tooth_depth / 2.0;
263
264 da = 2.0 * M_PI3.14159265358979323846 / teeth / 4.0;
265
266 /* Allocate memory for the triangle strip information */
267 gear->nstrips = STRIPS_PER_TOOTH7 * teeth;
268 gear->strips = g_malloc0_n (gear->nstrips, sizeof (*gear->strips));
269
270 /* Allocate memory for the vertices */
271 gear->vertices = g_malloc0_n (VERTICES_PER_TOOTH34 * teeth, sizeof(*gear->vertices));
272 v = gear->vertices;
273
274 for (i = 0; i < teeth; i++) {
275 /* A set of macros for making the creation of the gears easier */
276#define GEAR_POINT(p, r, da)do { p.x = (r) * c[(da)]; p.y = (r) * s[(da)]; } while(0) do { p.x = (r) * c[(da)]; p.y = (r) * s[(da)]; } while(0)
277#define SET_NORMAL(x, y, z)do { normal[0] = (x); normal[1] = (y); normal[2] = (z); } while
(0) do { \
278 normal[0] = (x); normal[1] = (y); normal[2] = (z); \
279} while(0)
280
281#define GEAR_VERT(v, point, sign)vert((v), p[(point)].x, p[(point)].y, (sign) * width * 0.5, normal
) vert((v), p[(point)].x, p[(point)].y, (sign) * width * 0.5, normal)
282
283#define START_STRIPdo { gear->strips[cur_strip].first = v - gear->vertices
; } while(0); do { \
284 gear->strips[cur_strip].first = v - gear->vertices; \
285} while(0);
286
287#define END_STRIPdo { int _tmp = (v - gear->vertices); gear->strips[cur_strip
].count = _tmp - gear->strips[cur_strip].first; cur_strip++
; } while (0) do { \
288 int _tmp = (v - gear->vertices); \
289 gear->strips[cur_strip].count = _tmp - gear->strips[cur_strip].first; \
290 cur_strip++; \
291} while (0)
292
293#define QUAD_WITH_NORMAL(p1, p2)do { do { normal[0] = ((p[(p1)].y - p[(p2)].y)); normal[1] = (
-(p[(p1)].x - p[(p2)].x)); normal[2] = (0); } while(0); v = vert
((v), p[((p1))].x, p[((p1))].y, (-1) * width * 0.5, normal); v
= vert((v), p[((p1))].x, p[((p1))].y, (1) * width * 0.5, normal
); v = vert((v), p[((p2))].x, p[((p2))].y, (-1) * width * 0.5
, normal); v = vert((v), p[((p2))].x, p[((p2))].y, (1) * width
* 0.5, normal); } while(0) do { \
294 SET_NORMAL((p[(p1)].y - p[(p2)].y), -(p[(p1)].x - p[(p2)].x), 0)do { normal[0] = ((p[(p1)].y - p[(p2)].y)); normal[1] = (-(p[
(p1)].x - p[(p2)].x)); normal[2] = (0); } while(0); \
295 v = GEAR_VERT(v, (p1), -1)vert((v), p[((p1))].x, p[((p1))].y, (-1) * width * 0.5, normal
); \
296 v = GEAR_VERT(v, (p1), 1)vert((v), p[((p1))].x, p[((p1))].y, (1) * width * 0.5, normal
); \
297 v = GEAR_VERT(v, (p2), -1)vert((v), p[((p2))].x, p[((p2))].y, (-1) * width * 0.5, normal
); \
298 v = GEAR_VERT(v, (p2), 1)vert((v), p[((p2))].x, p[((p2))].y, (1) * width * 0.5, normal
); \
299} while(0)
300 struct point {
301 GLfloat x;
302 GLfloat y;
303 };
304
305 /* Create the 7 points (only x,y coords) used to draw a tooth */
306 struct point p[7];
307
308 /* Calculate needed sin/cos for varius angles */
309 sincos(i * 2.0 * G_PI3.1415926535897932384626433832795028841971693993751 / teeth + da * 0, &s[0], &c[0]);
310 sincos(i * 2.0 * M_PI3.14159265358979323846 / teeth + da * 1, &s[1], &c[1]);
311 sincos(i * 2.0 * M_PI3.14159265358979323846 / teeth + da * 2, &s[2], &c[2]);
312 sincos(i * 2.0 * M_PI3.14159265358979323846 / teeth + da * 3, &s[3], &c[3]);
313 sincos(i * 2.0 * M_PI3.14159265358979323846 / teeth + da * 4, &s[4], &c[4]);
314
315 GEAR_POINT(p[0], r2, 1)do { p[0].x = (r2) * c[(1)]; p[0].y = (r2) * s[(1)]; } while(
0);
316 GEAR_POINT(p[1], r2, 2)do { p[1].x = (r2) * c[(2)]; p[1].y = (r2) * s[(2)]; } while(
0);
317 GEAR_POINT(p[2], r1, 0)do { p[2].x = (r1) * c[(0)]; p[2].y = (r1) * s[(0)]; } while(
0);
318 GEAR_POINT(p[3], r1, 3)do { p[3].x = (r1) * c[(3)]; p[3].y = (r1) * s[(3)]; } while(
0);
319 GEAR_POINT(p[4], r0, 0)do { p[4].x = (r0) * c[(0)]; p[4].y = (r0) * s[(0)]; } while(
0);
320 GEAR_POINT(p[5], r1, 4)do { p[5].x = (r1) * c[(4)]; p[5].y = (r1) * s[(4)]; } while(
0);
321 GEAR_POINT(p[6], r0, 4)do { p[6].x = (r0) * c[(4)]; p[6].y = (r0) * s[(4)]; } while(
0);
322
323 /* Front face */
324 START_STRIPdo { gear->strips[cur_strip].first = v - gear->vertices
; } while(0);;
325 SET_NORMAL(0, 0, 1.0)do { normal[0] = (0); normal[1] = (0); normal[2] = (1.0); } while
(0);
326 v = GEAR_VERT(v, 0, +1)vert((v), p[(0)].x, p[(0)].y, (+1) * width * 0.5, normal);
327 v = GEAR_VERT(v, 1, +1)vert((v), p[(1)].x, p[(1)].y, (+1) * width * 0.5, normal);
328 v = GEAR_VERT(v, 2, +1)vert((v), p[(2)].x, p[(2)].y, (+1) * width * 0.5, normal);
329 v = GEAR_VERT(v, 3, +1)vert((v), p[(3)].x, p[(3)].y, (+1) * width * 0.5, normal);
330 v = GEAR_VERT(v, 4, +1)vert((v), p[(4)].x, p[(4)].y, (+1) * width * 0.5, normal);
331 v = GEAR_VERT(v, 5, +1)vert((v), p[(5)].x, p[(5)].y, (+1) * width * 0.5, normal);
332 v = GEAR_VERT(v, 6, +1)vert((v), p[(6)].x, p[(6)].y, (+1) * width * 0.5, normal);
333 END_STRIPdo { int _tmp = (v - gear->vertices); gear->strips[cur_strip
].count = _tmp - gear->strips[cur_strip].first; cur_strip++
; } while (0);
334
335 /* Inner face */
336 START_STRIPdo { gear->strips[cur_strip].first = v - gear->vertices
; } while(0);;
337 QUAD_WITH_NORMAL(4, 6)do { do { normal[0] = ((p[(4)].y - p[(6)].y)); normal[1] = (-
(p[(4)].x - p[(6)].x)); normal[2] = (0); } while(0); v = vert
((v), p[((4))].x, p[((4))].y, (-1) * width * 0.5, normal); v =
vert((v), p[((4))].x, p[((4))].y, (1) * width * 0.5, normal)
; v = vert((v), p[((6))].x, p[((6))].y, (-1) * width * 0.5, normal
); v = vert((v), p[((6))].x, p[((6))].y, (1) * width * 0.5, normal
); } while(0);
338 END_STRIPdo { int _tmp = (v - gear->vertices); gear->strips[cur_strip
].count = _tmp - gear->strips[cur_strip].first; cur_strip++
; } while (0);
339
340 /* Back face */
341 START_STRIPdo { gear->strips[cur_strip].first = v - gear->vertices
; } while(0);;
342 SET_NORMAL(0, 0, -1.0)do { normal[0] = (0); normal[1] = (0); normal[2] = (-1.0); } while
(0);
343 v = GEAR_VERT(v, 6, -1)vert((v), p[(6)].x, p[(6)].y, (-1) * width * 0.5, normal);
344 v = GEAR_VERT(v, 5, -1)vert((v), p[(5)].x, p[(5)].y, (-1) * width * 0.5, normal);
345 v = GEAR_VERT(v, 4, -1)vert((v), p[(4)].x, p[(4)].y, (-1) * width * 0.5, normal);
346 v = GEAR_VERT(v, 3, -1)vert((v), p[(3)].x, p[(3)].y, (-1) * width * 0.5, normal);
347 v = GEAR_VERT(v, 2, -1)vert((v), p[(2)].x, p[(2)].y, (-1) * width * 0.5, normal);
348 v = GEAR_VERT(v, 1, -1)vert((v), p[(1)].x, p[(1)].y, (-1) * width * 0.5, normal);
349 v = GEAR_VERT(v, 0, -1)vert((v), p[(0)].x, p[(0)].y, (-1) * width * 0.5, normal);
350 END_STRIPdo { int _tmp = (v - gear->vertices); gear->strips[cur_strip
].count = _tmp - gear->strips[cur_strip].first; cur_strip++
; } while (0);
351
352 /* Outer face */
353 START_STRIPdo { gear->strips[cur_strip].first = v - gear->vertices
; } while(0);;
354 QUAD_WITH_NORMAL(0, 2)do { do { normal[0] = ((p[(0)].y - p[(2)].y)); normal[1] = (-
(p[(0)].x - p[(2)].x)); normal[2] = (0); } while(0); v = vert
((v), p[((0))].x, p[((0))].y, (-1) * width * 0.5, normal); v =
vert((v), p[((0))].x, p[((0))].y, (1) * width * 0.5, normal)
; v = vert((v), p[((2))].x, p[((2))].y, (-1) * width * 0.5, normal
); v = vert((v), p[((2))].x, p[((2))].y, (1) * width * 0.5, normal
); } while(0);
355 END_STRIPdo { int _tmp = (v - gear->vertices); gear->strips[cur_strip
].count = _tmp - gear->strips[cur_strip].first; cur_strip++
; } while (0);
356
357 START_STRIPdo { gear->strips[cur_strip].first = v - gear->vertices
; } while(0);;
358 QUAD_WITH_NORMAL(1, 0)do { do { normal[0] = ((p[(1)].y - p[(0)].y)); normal[1] = (-
(p[(1)].x - p[(0)].x)); normal[2] = (0); } while(0); v = vert
((v), p[((1))].x, p[((1))].y, (-1) * width * 0.5, normal); v =
vert((v), p[((1))].x, p[((1))].y, (1) * width * 0.5, normal)
; v = vert((v), p[((0))].x, p[((0))].y, (-1) * width * 0.5, normal
); v = vert((v), p[((0))].x, p[((0))].y, (1) * width * 0.5, normal
); } while(0);
359 END_STRIPdo { int _tmp = (v - gear->vertices); gear->strips[cur_strip
].count = _tmp - gear->strips[cur_strip].first; cur_strip++
; } while (0);
360
361 START_STRIPdo { gear->strips[cur_strip].first = v - gear->vertices
; } while(0);;
362 QUAD_WITH_NORMAL(3, 1)do { do { normal[0] = ((p[(3)].y - p[(1)].y)); normal[1] = (-
(p[(3)].x - p[(1)].x)); normal[2] = (0); } while(0); v = vert
((v), p[((3))].x, p[((3))].y, (-1) * width * 0.5, normal); v =
vert((v), p[((3))].x, p[((3))].y, (1) * width * 0.5, normal)
; v = vert((v), p[((1))].x, p[((1))].y, (-1) * width * 0.5, normal
); v = vert((v), p[((1))].x, p[((1))].y, (1) * width * 0.5, normal
); } while(0);
363 END_STRIPdo { int _tmp = (v - gear->vertices); gear->strips[cur_strip
].count = _tmp - gear->strips[cur_strip].first; cur_strip++
; } while (0);
364
365 START_STRIPdo { gear->strips[cur_strip].first = v - gear->vertices
; } while(0);;
366 QUAD_WITH_NORMAL(5, 3)do { do { normal[0] = ((p[(5)].y - p[(3)].y)); normal[1] = (-
(p[(5)].x - p[(3)].x)); normal[2] = (0); } while(0); v = vert
((v), p[((5))].x, p[((5))].y, (-1) * width * 0.5, normal); v =
vert((v), p[((5))].x, p[((5))].y, (1) * width * 0.5, normal)
; v = vert((v), p[((3))].x, p[((3))].y, (-1) * width * 0.5, normal
); v = vert((v), p[((3))].x, p[((3))].y, (1) * width * 0.5, normal
); } while(0);
367 END_STRIPdo { int _tmp = (v - gear->vertices); gear->strips[cur_strip
].count = _tmp - gear->strips[cur_strip].first; cur_strip++
; } while (0);
368 }
369
370 gear->nvertices = (v - gear->vertices);
371
372 return gear;
373}
374
375/**
376 * Multiplies two 4x4 matrices.
377 *
378 * The result is stored in matrix m.
379 *
380 * @param m the first matrix to multiply
381 * @param n the second matrix to multiply
382 */
383static void
384multiply (GLfloat *m, const GLfloat *n)
385{
386 GLfloat tmp[16];
387 int i, j;
388
389 for (i = 0; i < 16; i++) {
390 const GLfloat *row, *column;
391 div_t d;
392
393 tmp[i] = 0;
394 d = div(i, 4);
395 row = n + d.quot * 4;
396 column = m + d.rem;
397 for (j = 0; j < 4; j++)
398 tmp[i] += row[j] * column[j * 4];
399 }
400 memcpy(m, &tmp, sizeof tmp);
401}
402
403/**
404 * Rotates a 4x4 matrix.
405 *
406 * @param[in,out] m the matrix to rotate
407 * @param angle the angle to rotate
408 * @param x the x component of the direction to rotate to
409 * @param y the y component of the direction to rotate to
410 * @param z the z component of the direction to rotate to
411 */
412static void
413rotate(GLfloat *m, GLfloat angle, GLfloat x, GLfloat y, GLfloat z)
414{
415 double s = sin (angle);
416 double c = cos (angle);
417
418 GLfloat r[16] = {
419 x * x * (1 - c) + c, y * x * (1 - c) + z * s, x * z * (1 - c) - y * s, 0,
420 x * y * (1 - c) - z * s, y * y * (1 - c) + c, y * z * (1 - c) + x * s, 0,
421 x * z * (1 - c) + y * s, y * z * (1 - c) - x * s, z * z * (1 - c) + c, 0,
422 0, 0, 0, 1
423 };
424
425 multiply(m, r);
426}
427
428/**
429 * Translates a 4x4 matrix.
430 *
431 * @param[in,out] m the matrix to translate
432 * @param x the x component of the direction to translate to
433 * @param y the y component of the direction to translate to
434 * @param z the z component of the direction to translate to
435 */
436static void
437translate(GLfloat *m, GLfloat x, GLfloat y, GLfloat z)
438{
439 GLfloat t[16] = { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, x, y, z, 1 };
440
441 multiply(m, t);
442}
443
444/**
445 * Creates an identity 4x4 matrix.
446 *
447 * @param m the matrix make an identity matrix
448 */
449static void
450identity(GLfloat *m)
451{
452 GLfloat t[16] = {
453 1.0, 0.0, 0.0, 0.0,
454 0.0, 1.0, 0.0, 0.0,
455 0.0, 0.0, 1.0, 0.0,
456 0.0, 0.0, 0.0, 1.0,
457 };
458
459 memcpy(m, t, sizeof(t));
460}
461
462/**
463 * Transposes a 4x4 matrix.
464 *
465 * @param m the matrix to transpose
466 */
467static void
468transpose(GLfloat *m)
469{
470 GLfloat t[16] = {
471 m[0], m[4], m[8], m[12],
472 m[1], m[5], m[9], m[13],
473 m[2], m[6], m[10], m[14],
474 m[3], m[7], m[11], m[15]};
475
476 memcpy(m, t, sizeof(t));
477}
478
479/**
480 * Inverts a 4x4 matrix.
481 *
482 * This function can currently handle only pure translation-rotation matrices.
483 * Read http://www.gamedev.net/community/forums/topic.asp?topic_id=425118
484 * for an explanation.
485 */
486static void
487invert(GLfloat *m)
488{
489 GLfloat t[16];
490 identity(t);
491
492 // Extract and invert the translation part 't'. The inverse of a
493 // translation matrix can be calculated by negating the translation
494 // coordinates.
495 t[12] = -m[12]; t[13] = -m[13]; t[14] = -m[14];
496
497 // Invert the rotation part 'r'. The inverse of a rotation matrix is
498 // equal to its transpose.
499 m[12] = m[13] = m[14] = 0;
500 transpose(m);
501
502 // inv(m) = inv(r) * inv(t)
503 multiply(m, t);
504}
505
506/**
507 * Calculate a perspective projection transformation.
508 *
509 * @param m the matrix to save the transformation in
510 * @param fovy the field of view in the y direction
511 * @param aspect the view aspect ratio
512 * @param zNear the near clipping plane
513 * @param zFar the far clipping plane
514 */
515void perspective(GLfloat *m, GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar)
516{
517 GLfloat tmp[16];
518 double sine, cosine, cotangent, deltaZ;
519 GLfloat radians = fovy / 2 * M_PI3.14159265358979323846 / 180;
520 identity(tmp);
521
522 deltaZ = zFar - zNear;
523 sincos(radians, &sine, &cosine);
524
525 if ((deltaZ == 0) || (sine == 0) || (aspect == 0))
526 return;
527
528 cotangent = cosine / sine;
529
530 tmp[0] = cotangent / aspect;
531 tmp[5] = cotangent;
532 tmp[10] = -(zFar + zNear) / deltaZ;
533 tmp[11] = -1;
534 tmp[14] = -2 * zNear * zFar / deltaZ;
535 tmp[15] = 0;
536
537 memcpy(m, tmp, sizeof(tmp));
538}
539
540/**
541 * Draws a gear.
542 *
543 * @param gear the gear to draw
544 * @param transform the current transformation matrix
545 * @param x the x position to draw the gear at
546 * @param y the y position to draw the gear at
547 * @param angle the rotation angle of the gear
548 * @param color the color of the gear
549 */
550static void
551draw_gear(CtkGears *self,
552 struct gear *gear,
553 GLuint gear_vbo,
554 GLfloat *transform,
555 GLfloat x,
556 GLfloat y,
557 GLfloat angle,
558 const GLfloat color[4])
559{
560 CtkGearsPrivate *priv = ctk_gears_get_instance_private (self);
561 GLfloat model_view[16];
562 GLfloat normal_matrix[16];
563 GLfloat model_view_projection[16];
564 int n;
565
566 /* Translate and rotate the gear */
567 memcpy(model_view, transform, sizeof (model_view));
568 translate(model_view, x, y, 0);
569 rotate(model_view, 2 * G_PI3.1415926535897932384626433832795028841971693993751 * angle / 360.0, 0, 0, 1);
570
571 /* Create and set the ModelViewProjectionMatrix */
572 memcpy(model_view_projection, priv->ProjectionMatrix, sizeof(model_view_projection));
573 multiply(model_view_projection, model_view);
574
575 glUniformMatrix4fvepoxy_glUniformMatrix4fv(priv->ModelViewProjectionMatrix_location, 1, GL_FALSE0,
576 model_view_projection);
577
578 /*
579 * Create and set the NormalMatrix. It's the inverse transpose of the
580 * ModelView matrix.
581 */
582 memcpy(normal_matrix, model_view, sizeof (normal_matrix));
583 invert(normal_matrix);
584 transpose(normal_matrix);
585 glUniformMatrix4fvepoxy_glUniformMatrix4fv(priv->NormalMatrix_location, 1, GL_FALSE0, normal_matrix);
586
587 /* Set the gear color */
588 glUniform4fvepoxy_glUniform4fv(priv->MaterialColor_location, 1, color);
589
590 /* Set the vertex buffer object to use */
591 glBindBufferepoxy_glBindBuffer(GL_ARRAY_BUFFER0x8892, gear_vbo);
592
593 /* Set up the position of the attributes in the vertex buffer object */
594 glVertexAttribPointerepoxy_glVertexAttribPointer(0, 3, GL_FLOAT0x1406, GL_FALSE0, 6 * sizeof(GLfloat), NULL((void*)0));
595 glVertexAttribPointerepoxy_glVertexAttribPointer(1, 3, GL_FLOAT0x1406, GL_FALSE0, 6 * sizeof(GLfloat), (GLfloat *) 0 + 3);
596
597 /* Enable the attributes */
598 glEnableVertexAttribArrayepoxy_glEnableVertexAttribArray(0);
599 glEnableVertexAttribArrayepoxy_glEnableVertexAttribArray(1);
600
601 /* Draw the triangle strips that comprise the gear */
602 for (n = 0; n < gear->nstrips; n++) {
603 glDrawArraysepoxy_glDrawArrays(GL_TRIANGLE_STRIP0x0005, gear->strips[n].first, gear->strips[n].count);
604 }
605
606 /* Disable the attributes */
607 glDisableVertexAttribArrayepoxy_glDisableVertexAttribArray(1);
608 glDisableVertexAttribArrayepoxy_glDisableVertexAttribArray(0);
609}
610
611/* new window size or exposure */
612static void
613ctk_gears_reshape (CtkGLArea *area, int width, int height)
614{
615 CtkGearsPrivate *priv = ctk_gears_get_instance_private ((CtkGears *) area);
616
617 /* Update the projection matrix */
618 perspective (priv->ProjectionMatrix, 60.0, width / (float)height, 1.0, 1024.0);
619
620 /* Set the viewport */
621 glViewportepoxy_glViewport (0, 0, (GLint) width, (GLint) height);
622}
623
624static gboolean
625ctk_gears_render (CtkGLArea *area,
626 CdkGLContext *context G_GNUC_UNUSED__attribute__ ((__unused__)))
627{
628 static const GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
629 static const GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
630 static const GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
631
632 CtkGears *self = CTK_GEARS (area)((((CtkGears*) (void *) g_type_check_instance_cast ((GTypeInstance
*) ((area)), ((ctk_gears_get_type ()))))));
633 CtkGearsPrivate *priv = ctk_gears_get_instance_private (self);
634 GLfloat transform[16];
635
636 identity (transform);
637
638 glClearColorepoxy_glClearColor (0.0, 0.0, 0.0, 0.0);
639 glClearepoxy_glClear (GL_COLOR_BUFFER_BIT0x00004000 | GL_DEPTH_BUFFER_BIT0x00000100);
640
641 /* Translate and rotate the view */
642 translate (transform, 0, 0, -20);
643 rotate (transform, 2 * G_PI3.1415926535897932384626433832795028841971693993751 * priv->view_rot[0] / 360.0, 1, 0, 0);
644 rotate (transform, 2 * G_PI3.1415926535897932384626433832795028841971693993751 * priv->view_rot[1] / 360.0, 0, 1, 0);
645 rotate (transform, 2 * G_PI3.1415926535897932384626433832795028841971693993751 * priv->view_rot[2] / 360.0, 0, 0, 1);
646
647 /* Draw the gears */
648 draw_gear (self, priv->gear1, priv->gear_vbo[0], transform, -3.0, -2.0, priv->angle, red);
649 draw_gear (self, priv->gear2, priv->gear_vbo[1], transform, 3.1, -2.0, -2 * priv->angle - 9.0, green);
650 draw_gear (self, priv->gear3, priv->gear_vbo[2], transform, -3.1, 4.2, -2 * priv->angle - 25.0, blue);
651
652 return TRUE(!(0));
653}
654
655static const char vertex_shader_gl[] =
656"#version 330\n"
657"\n"
658"in vec3 position;\n"
659"in vec3 normal;\n"
660"\n"
661"uniform mat4 ModelViewProjectionMatrix;\n"
662"uniform mat4 NormalMatrix;\n"
663"uniform vec4 LightSourcePosition;\n"
664"uniform vec4 MaterialColor;\n"
665"\n"
666"smooth out vec4 Color;\n"
667"\n"
668"void main(void)\n"
669"{\n"
670" // Transform the normal to eye coordinates\n"
671" vec3 N = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));\n"
672"\n"
673" // The LightSourcePosition is actually its direction for directional light\n"
674" vec3 L = normalize(LightSourcePosition.xyz);\n"
675"\n"
676" // Multiply the diffuse value by the vertex color (which is fixed in this case)\n"
677" // to get the actual color that we will use to draw this vertex with\n"
678" float diffuse = max(dot(N, L), 0.0);\n"
679" Color = diffuse * MaterialColor;\n"
680"\n"
681" // Transform the position to clip coordinates\n"
682" gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);\n"
683"}";
684
685static const char fragment_shader_gl[] =
686"#version 330\n"
687"\n"
688"smooth in vec4 Color;\n"
689"\n"
690"out vec4 vertexColor;\n"
691"\n"
692"void main(void)\n"
693"{\n"
694" vertexColor = Color;\n"
695"}";
696
697static const char vertex_shader_gles[] =
698"attribute vec3 position;\n"
699"attribute vec3 normal;\n"
700"\n"
701"uniform mat4 ModelViewProjectionMatrix;\n"
702"uniform mat4 NormalMatrix;\n"
703"uniform vec4 LightSourcePosition;\n"
704"uniform vec4 MaterialColor;\n"
705"\n"
706"varying vec4 Color;\n"
707"\n"
708"void main(void)\n"
709"{\n"
710" // Transform the normal to eye coordinates\n"
711" vec3 N = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));\n"
712"\n"
713" // The LightSourcePosition is actually its direction for directional light\n"
714" vec3 L = normalize(LightSourcePosition.xyz);\n"
715"\n"
716" // Multiply the diffuse value by the vertex color (which is fixed in this case)\n"
717" // to get the actual color that we will use to draw this vertex with\n"
718" float diffuse = max(dot(N, L), 0.0);\n"
719" Color = diffuse * MaterialColor;\n"
720"\n"
721" // Transform the position to clip coordinates\n"
722" gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);\n"
723"}";
724
725static const char fragment_shader_gles[] =
726"precision mediump float;\n"
727"varying vec4 Color;\n"
728"\n"
729"void main(void)\n"
730"{\n"
731" gl_FragColor = Color;\n"
732"}";
733
734static void
735ctk_gears_realize (CtkWidget *widget)
736{
737 CtkGLArea *glarea = CTK_GL_AREA (widget)((((CtkGLArea*) (void *) g_type_check_instance_cast ((GTypeInstance
*) ((widget)), ((ctk_gl_area_get_type ()))))));
738 CtkGears *gears = CTK_GEARS (widget)((((CtkGears*) (void *) g_type_check_instance_cast ((GTypeInstance
*) ((widget)), ((ctk_gears_get_type ()))))));
739 CtkGearsPrivate *priv = ctk_gears_get_instance_private (gears);
740 CdkGLContext *context;
741 GLuint vao, v, f, program;
742 const char *p;
743 char msg[512];
744
745 CTK_WIDGET_CLASS (ctk_gears_parent_class)((((CtkWidgetClass*) (void *) g_type_check_class_cast ((GTypeClass
*) ((ctk_gears_parent_class)), ((ctk_widget_get_type ()))))))->realize (widget);
746
747 ctk_gl_area_make_current (glarea);
748 if (ctk_gl_area_get_error (glarea) != NULL((void*)0))
749 return;
750
751 context = ctk_gl_area_get_context (glarea);
752
753 glEnableepoxy_glEnable (GL_CULL_FACE0x0B44);
754 glEnableepoxy_glEnable (GL_DEPTH_TEST0x0B71);
755
756 /* Create the VAO */
757 glGenVertexArraysepoxy_glGenVertexArrays (1, &vao);
758 glBindVertexArrayepoxy_glBindVertexArray (vao);
759 priv->vao = vao;
760
761 /* Compile the vertex shader */
762 if (cdk_gl_context_get_use_es (context))
763 p = vertex_shader_gles;
764 else
765 p = vertex_shader_gl;
766 v = glCreateShaderepoxy_glCreateShader(GL_VERTEX_SHADER0x8B31);
767 glShaderSourceepoxy_glShaderSource(v, 1, &p, NULL((void*)0));
768 glCompileShaderepoxy_glCompileShader(v);
769 glGetShaderInfoLogepoxy_glGetShaderInfoLog(v, sizeof msg, NULL((void*)0), msg);
770 g_print ("vertex shader info: %s\n", msg);
771
772 /* Compile the fragment shader */
773 if (cdk_gl_context_get_use_es (context))
774 p = fragment_shader_gles;
775 else
776 p = fragment_shader_gl;
777 f = glCreateShaderepoxy_glCreateShader(GL_FRAGMENT_SHADER0x8B30);
778 glShaderSourceepoxy_glShaderSource(f, 1, &p, NULL((void*)0));
779 glCompileShaderepoxy_glCompileShader(f);
780 glGetShaderInfoLogepoxy_glGetShaderInfoLog(f, sizeof msg, NULL((void*)0), msg);
781 g_print ("fragment shader info: %s\n", msg);
782
783 /* Create and link the shader program */
784 program = glCreateProgramepoxy_glCreateProgram();
785 glAttachShaderepoxy_glAttachShader(program, v);
786 glAttachShaderepoxy_glAttachShader(program, f);
787 glBindAttribLocationepoxy_glBindAttribLocation(program, 0, "position");
788 glBindAttribLocationepoxy_glBindAttribLocation(program, 1, "normal");
789
790 glLinkProgramepoxy_glLinkProgram(program);
791 glGetProgramInfoLogepoxy_glGetProgramInfoLog(program, sizeof msg, NULL((void*)0), msg);
792 g_print ("program info: %s\n", msg);
793 glDeleteShaderepoxy_glDeleteShader (v);
794 glDeleteShaderepoxy_glDeleteShader (f);
795
796 /* Enable the shaders */
797 glUseProgramepoxy_glUseProgram(program);
798 priv->program = program;
799
800 /* Get the locations of the uniforms so we can access them */
801 priv->ModelViewProjectionMatrix_location = glGetUniformLocationepoxy_glGetUniformLocation(program, "ModelViewProjectionMatrix");
802 priv->NormalMatrix_location = glGetUniformLocationepoxy_glGetUniformLocation(program, "NormalMatrix");
803 priv->LightSourcePosition_location = glGetUniformLocationepoxy_glGetUniformLocation(program, "LightSourcePosition");
804 priv->MaterialColor_location = glGetUniformLocationepoxy_glGetUniformLocation(program, "MaterialColor");
805
806 /* Set the LightSourcePosition uniform which is constant throught the program */
807 glUniform4fvepoxy_glUniform4fv(priv->LightSourcePosition_location, 1, priv->LightSourcePosition);
808
809 /* make the gears */
810 priv->gear1 = create_gear(1.0, 4.0, 1.0, 20, 0.7);
811
812 /* Store the vertices in a vertex buffer object (VBO) */
813 glGenBuffersepoxy_glGenBuffers (1, &(priv->gear_vbo[0]));
814 glBindBufferepoxy_glBindBuffer (GL_ARRAY_BUFFER0x8892, priv->gear_vbo[0]);
815 glBufferDataepoxy_glBufferData (GL_ARRAY_BUFFER0x8892,
816 priv->gear1->nvertices * sizeof(GearVertex),
817 priv->gear1->vertices,
818 GL_STATIC_DRAW0x88E4);
819
820 priv->gear2 = create_gear(0.5, 2.0, 2.0, 10, 0.7);
821 glGenBuffersepoxy_glGenBuffers (1, &(priv->gear_vbo[1]));
822 glBindBufferepoxy_glBindBuffer (GL_ARRAY_BUFFER0x8892, priv->gear_vbo[1]);
823 glBufferDataepoxy_glBufferData (GL_ARRAY_BUFFER0x8892,
824 priv->gear2->nvertices * sizeof(GearVertex),
825 priv->gear2->vertices,
826 GL_STATIC_DRAW0x88E4);
827
828 priv->gear3 = create_gear(1.3, 2.0, 0.5, 10, 0.7);
829 glGenBuffersepoxy_glGenBuffers (1, &(priv->gear_vbo[2]));
830 glBindBufferepoxy_glBindBuffer (GL_ARRAY_BUFFER0x8892, priv->gear_vbo[2]);
831 glBufferDataepoxy_glBufferData (GL_ARRAY_BUFFER0x8892,
832 priv->gear3->nvertices * sizeof(GearVertex),
833 priv->gear3->vertices,
834 GL_STATIC_DRAW0x88E4);
835}
836
837static void
838ctk_gears_unrealize (CtkWidget *widget)
839{
840 CtkGLArea *glarea = CTK_GL_AREA (widget)((((CtkGLArea*) (void *) g_type_check_instance_cast ((GTypeInstance
*) ((widget)), ((ctk_gl_area_get_type ()))))));
841 CtkGearsPrivate *priv = ctk_gears_get_instance_private ((CtkGears *) widget);
842
843 ctk_gl_area_make_current (glarea);
844 if (ctk_gl_area_get_error (glarea) != NULL((void*)0))
845 return;
846
847 /* Release the resources associated with OpenGL */
848 if (priv->gear_vbo[0] != 0)
849 glDeleteBuffersepoxy_glDeleteBuffers (1, &(priv->gear_vbo[0]));
850
851 if (priv->gear_vbo[1] != 0)
852 glDeleteBuffersepoxy_glDeleteBuffers (1, &(priv->gear_vbo[1]));
853
854 if (priv->gear_vbo[2] != 0)
855 glDeleteBuffersepoxy_glDeleteBuffers (1, &(priv->gear_vbo[2]));
856
857 if (priv->vao != 0)
858 glDeleteVertexArraysepoxy_glDeleteVertexArrays (1, &priv->vao);
859
860 if (priv->program != 0)
861 glDeleteProgramepoxy_glDeleteProgram (priv->program);
862
863 priv->ModelViewProjectionMatrix_location = 0;
864 priv->NormalMatrix_location = 0;
865 priv->LightSourcePosition_location = 0;
866 priv->MaterialColor_location = 0;
867
868 CTK_WIDGET_CLASS (ctk_gears_parent_class)((((CtkWidgetClass*) (void *) g_type_check_class_cast ((GTypeClass
*) ((ctk_gears_parent_class)), ((ctk_widget_get_type ()))))))->unrealize (widget);
869}
870
871static gboolean
872ctk_gears_tick (CtkWidget *widget,
873 CdkFrameClock *frame_clock,
874 gpointer user_data G_GNUC_UNUSED__attribute__ ((__unused__)))
875{
876 CtkGears *gears = CTK_GEARS (widget)((((CtkGears*) (void *) g_type_check_instance_cast ((GTypeInstance
*) ((widget)), ((ctk_gears_get_type ()))))));
877 CtkGearsPrivate *priv = ctk_gears_get_instance_private (gears);
878 CdkFrameTimings *timings, *previous_timings;
879 gint64 previous_frame_time = 0;
880 gint64 frame_time;
881 gint64 history_start, history_len;
882 gint64 frame;
883
884 frame = cdk_frame_clock_get_frame_counter (frame_clock);
885 frame_time = cdk_frame_clock_get_frame_time (frame_clock);
886
887 if (priv->first_frame_time == 0)
888 {
889 /* No need for changes on first frame */
890 priv->first_frame_time = frame_time;
891 if (priv->fps_label)
892 ctk_label_set_label (priv->fps_label, "FPS: ---");
893 return G_SOURCE_CONTINUE(!(0));
894 }
895
896 /* glxgears advances 70 degrees per second, so do the same */
897
898 priv->angle = fmod ((frame_time - priv->first_frame_time) / (double)G_USEC_PER_SEC1000000 * 70.0, 360.0);
899
900 ctk_widget_queue_draw (widget);
901
902 history_start = cdk_frame_clock_get_history_start (frame_clock);
903
904 if (priv->fps_label && frame % 60 == 0)
905 {
906 history_len = frame - history_start;
907 if (history_len > 0)
908 {
909 char *s;
910
911 previous_timings = cdk_frame_clock_get_timings (frame_clock, frame - history_len);
912 previous_frame_time = cdk_frame_timings_get_frame_time (previous_timings);
913
914 s = g_strdup_printf ("FPS: %-4.1f", (G_USEC_PER_SEC1000000 * history_len) / (double)(frame_time - previous_frame_time));
915 ctk_label_set_label (priv->fps_label, s);
916 g_free (s);
917 }
918 }
919
920 timings = cdk_frame_clock_get_current_timings (frame_clock);
921 previous_timings = cdk_frame_clock_get_timings (frame_clock,
922 cdk_frame_timings_get_frame_counter (timings) - 1);
923 if (previous_timings != NULL((void*)0))
924 previous_frame_time = cdk_frame_timings_get_frame_time (previous_timings);
Value stored to 'previous_frame_time' is never read
925
926 return G_SOURCE_CONTINUE(!(0));
927}
928
929void
930ctk_gears_set_axis (CtkGears *gears, int axis, double value)
931{
932 CtkGearsPrivate *priv = ctk_gears_get_instance_private (gears);
933
934 if (axis < 0 || axis >= CTK_GEARS_N_AXIS)
935 return;
936
937 priv->view_rot[axis] = value;
938
939 ctk_widget_queue_draw (CTK_WIDGET (gears)((((CtkWidget*) (void *) g_type_check_instance_cast ((GTypeInstance
*) ((gears)), ((ctk_widget_get_type ())))))));
940}
941
942double
943ctk_gears_get_axis (CtkGears *gears, int axis)
944{
945 CtkGearsPrivate *priv = ctk_gears_get_instance_private (gears);
946
947 if (axis < 0 || axis >= CTK_GEARS_N_AXIS)
948 return 0.0;
949
950 return priv->view_rot[axis];
951}
952
953void
954ctk_gears_set_fps_label (CtkGears *gears, CtkLabel *label)
955{
956 CtkGearsPrivate *priv = ctk_gears_get_instance_private (gears);
957
958 if (label)
959 g_object_ref (label)((__typeof__ (label)) (g_object_ref) (label));
960
961 g_clear_object (&priv->fps_label)do { _Static_assert (sizeof *((&priv->fps_label)) == sizeof
(gpointer), "Expression evaluates to false"); __typeof__ (((
&priv->fps_label))) _pp = ((&priv->fps_label));
__typeof__ (*((&priv->fps_label))) _ptr = *_pp; *_pp =
((void*)0); if (_ptr) (g_object_unref) (_ptr); } while (0);
962
963 priv->fps_label = label;
964}