Mercurial > sdl-ios-xcode
annotate docs/html/guideeventexamples.html @ 876:9e84d106ec19
(Said Max Horn on the SDL mailing list...)
Hi folks,
based on Eric Wing's patch, I created the attached patch which fixes
the OpenGL coordinate inversion bug in SDL. It works fine over here on
10.3 with Ryan's test program (which I also attached).
There is another change in it: I removed the "- 1" in the two lines
using CGDisplayPixelsHigh()... while I understand from a logical point
of view why they *should* be correct, I checked the actual values
computed that way, and they were off-by-one. After removing the " - 1",
the returned mouse coordinates are correct. I checked this by moving
the mouse to the screen top/bottom in fullscreen mode, BTW. With the
change, the proper values 0 and 479 are returned (in 640x480 mode).
Sam, you may still want to test on 10.1, it's very simple using Ryan's
minimal test code :-)
Cheers,
Max
(Here is the reproduction case for revision history's sake...)
/*
* To compile:
* gcc -o test test.c `sdl-config --cflags` `sdl-config --libs` -framework OpenGL
*
* --ryan.
*/
#include <stdio.h>
#include "SDL.h"
#include "SDL_opengl.h"
int main(int argc, char **argv)
{
Uint32 flags = SDL_OPENGL /* | SDL_FULLSCREEN */;
SDL_Surface *screen;
SDL_Event event;
int done = 0;
GLfloat ratio;
SDL_Init(SDL_INIT_VIDEO);
SDL_ShowCursor(0);
if ((argv[1]) && (strcmp(argv[1], "--grab") == 0))
SDL_WM_GrabInput(SDL_GRAB_ON);
screen = SDL_SetVideoMode(640, 480, 0, flags);
if (!screen)
return(42);
ratio = ((GLfloat) screen->w) / ((GLfloat) screen->h);
glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
glClearDepth( 1.0f );
glEnable( GL_DEPTH_TEST );
glDepthFunc( GL_LEQUAL );
glViewport( 0, 0, screen->w, screen->h);
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluPerspective( 45.0f, ratio, 0.1f, 100.0f );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
SDL_GL_SwapBuffers();
// eh, close enough.
#define MAX_X 6.12
#define MAX_Y 4.50
while (!done)
{
int x, y;
GLfloat glx, gly;
if (!SDL_WaitEvent(&event))
break;
switch (event.type)
{
case SDL_KEYUP:
if (event.key.keysym.sym == SDLK_ESCAPE)
done = 1;
break;
}
SDL_GetMouseState(&x, &y);
glx = ((((GLfloat) x) / ((GLfloat) screen->w)) - 0.5f) * MAX_X;
gly = ((((GLfloat) y) / ((GLfloat) screen->h)) - 0.5f) * MAX_Y;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(glx,-gly,-6.0f);
glBegin(GL_TRIANGLES);
glColor3f(1,0,0); glVertex3f( 0.00f, 0.25f, 0.00f);
glColor3f(0,1,0); glVertex3f(-0.25f, -0.25f, 0.00f);
glColor3f(0,0,1); glVertex3f( 0.25f, -0.25f, 0.00f);
glEnd();
SDL_GL_SwapBuffers();
}
SDL_Quit();
return(0);
}
/* end of test.c ... */
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Mon, 22 Mar 2004 09:38:20 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >Event Examples</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
0 | 8 "><LINK |
9 REL="HOME" | |
10 TITLE="SDL Library Documentation" | |
11 HREF="index.html"><LINK | |
12 REL="UP" | |
13 TITLE="Examples" | |
14 HREF="guideexamples.html"><LINK | |
15 REL="PREVIOUS" | |
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16 TITLE="Examples" |
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17 HREF="guideexamples.html"><LINK |
0 | 18 REL="NEXT" |
19 TITLE="Audio Examples" | |
20 HREF="guideaudioexamples.html"></HEAD | |
21 ><BODY | |
22 CLASS="SECT1" | |
23 BGCOLOR="#FFF8DC" | |
24 TEXT="#000000" | |
25 LINK="#0000ee" | |
26 VLINK="#551a8b" | |
27 ALINK="#ff0000" | |
28 ><DIV | |
29 CLASS="NAVHEADER" | |
30 ><TABLE | |
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31 SUMMARY="Header navigation table" |
0 | 32 WIDTH="100%" |
33 BORDER="0" | |
34 CELLPADDING="0" | |
35 CELLSPACING="0" | |
36 ><TR | |
37 ><TH | |
38 COLSPAN="3" | |
39 ALIGN="center" | |
40 >SDL Library Documentation</TH | |
41 ></TR | |
42 ><TR | |
43 ><TD | |
44 WIDTH="10%" | |
45 ALIGN="left" | |
46 VALIGN="bottom" | |
47 ><A | |
55
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48 HREF="guideexamples.html" |
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49 ACCESSKEY="P" |
0 | 50 >Prev</A |
51 ></TD | |
52 ><TD | |
53 WIDTH="80%" | |
54 ALIGN="center" | |
55 VALIGN="bottom" | |
56 >Chapter 4. Examples</TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="guideaudioexamples.html" | |
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63 ACCESSKEY="N" |
0 | 64 >Next</A |
65 ></TD | |
66 ></TR | |
67 ></TABLE | |
68 ><HR | |
69 ALIGN="LEFT" | |
70 WIDTH="100%"></DIV | |
71 ><DIV | |
72 CLASS="SECT1" | |
73 ><H1 | |
74 CLASS="SECT1" | |
75 ><A | |
76 NAME="GUIDEEVENTEXAMPLES" | |
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77 ></A |
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78 >Event Examples</H1 |
0 | 79 ><P |
80 ></P | |
81 ><DIV | |
82 CLASS="SECT2" | |
83 ><H2 | |
84 CLASS="SECT2" | |
85 ><A | |
55
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86 NAME="AEN375" |
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87 ></A |
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88 >Filtering and Handling Events</H2 |
0 | 89 ><P |
90 ><PRE | |
91 CLASS="PROGRAMLISTING" | |
92 >#include <stdio.h> | |
93 #include <stdlib.h> | |
94 | |
95 #include "SDL.h" | |
96 | |
97 /* This function may run in a separate event thread */ | |
98 int FilterEvents(const SDL_Event *event) { | |
99 static int boycott = 1; | |
100 | |
101 /* This quit event signals the closing of the window */ | |
102 if ( (event->type == SDL_QUIT) && boycott ) { | |
103 printf("Quit event filtered out -- try again.\n"); | |
104 boycott = 0; | |
105 return(0); | |
106 } | |
107 if ( event->type == SDL_MOUSEMOTION ) { | |
108 printf("Mouse moved to (%d,%d)\n", | |
109 event->motion.x, event->motion.y); | |
110 return(0); /* Drop it, we've handled it */ | |
111 } | |
112 return(1); | |
113 } | |
114 | |
115 int main(int argc, char *argv[]) | |
116 { | |
117 SDL_Event event; | |
118 | |
119 /* Initialize the SDL library (starts the event loop) */ | |
120 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { | |
121 fprintf(stderr, | |
122 "Couldn't initialize SDL: %s\n", SDL_GetError()); | |
123 exit(1); | |
124 } | |
125 | |
126 /* Clean up on exit, exit on window close and interrupt */ | |
127 atexit(SDL_Quit); | |
128 | |
129 /* Ignore key events */ | |
130 SDL_EventState(SDL_KEYDOWN, SDL_IGNORE); | |
131 SDL_EventState(SDL_KEYUP, SDL_IGNORE); | |
132 | |
133 /* Filter quit and mouse motion events */ | |
134 SDL_SetEventFilter(FilterEvents); | |
135 | |
136 /* The mouse isn't much use unless we have a display for reference */ | |
137 if ( SDL_SetVideoMode(640, 480, 8, 0) == NULL ) { | |
138 fprintf(stderr, "Couldn't set 640x480x8 video mode: %s\n", | |
139 SDL_GetError()); | |
140 exit(1); | |
141 } | |
142 | |
143 /* Loop waiting for ESC+Mouse_Button */ | |
144 while ( SDL_WaitEvent(&event) >= 0 ) { | |
145 switch (event.type) { | |
146 case SDL_ACTIVEEVENT: { | |
147 if ( event.active.state & SDL_APPACTIVE ) { | |
148 if ( event.active.gain ) { | |
149 printf("App activated\n"); | |
150 } else { | |
151 printf("App iconified\n"); | |
152 } | |
153 } | |
154 } | |
155 break; | |
156 | |
157 case SDL_MOUSEBUTTONDOWN: { | |
158 Uint8 *keys; | |
159 | |
160 keys = SDL_GetKeyState(NULL); | |
161 if ( keys[SDLK_ESCAPE] == SDL_PRESSED ) { | |
162 printf("Bye bye...\n"); | |
163 exit(0); | |
164 } | |
165 printf("Mouse button pressed\n"); | |
166 } | |
167 break; | |
168 | |
169 case SDL_QUIT: { | |
170 printf("Quit requested, quitting.\n"); | |
171 exit(0); | |
172 } | |
173 break; | |
174 } | |
175 } | |
176 /* This should never happen */ | |
177 printf("SDL_WaitEvent error: %s\n", SDL_GetError()); | |
178 exit(1); | |
179 }</PRE | |
180 ></P | |
181 ></DIV | |
182 ></DIV | |
183 ><DIV | |
184 CLASS="NAVFOOTER" | |
185 ><HR | |
186 ALIGN="LEFT" | |
187 WIDTH="100%"><TABLE | |
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188 SUMMARY="Footer navigation table" |
0 | 189 WIDTH="100%" |
190 BORDER="0" | |
191 CELLPADDING="0" | |
192 CELLSPACING="0" | |
193 ><TR | |
194 ><TD | |
195 WIDTH="33%" | |
196 ALIGN="left" | |
197 VALIGN="top" | |
198 ><A | |
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199 HREF="guideexamples.html" |
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200 ACCESSKEY="P" |
0 | 201 >Prev</A |
202 ></TD | |
203 ><TD | |
204 WIDTH="34%" | |
205 ALIGN="center" | |
206 VALIGN="top" | |
207 ><A | |
208 HREF="index.html" | |
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209 ACCESSKEY="H" |
0 | 210 >Home</A |
211 ></TD | |
212 ><TD | |
213 WIDTH="33%" | |
214 ALIGN="right" | |
215 VALIGN="top" | |
216 ><A | |
217 HREF="guideaudioexamples.html" | |
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218 ACCESSKEY="N" |
0 | 219 >Next</A |
220 ></TD | |
221 ></TR | |
222 ><TR | |
223 ><TD | |
224 WIDTH="33%" | |
225 ALIGN="left" | |
226 VALIGN="top" | |
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227 >Examples</TD |
0 | 228 ><TD |
229 WIDTH="34%" | |
230 ALIGN="center" | |
231 VALIGN="top" | |
232 ><A | |
233 HREF="guideexamples.html" | |
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234 ACCESSKEY="U" |
0 | 235 >Up</A |
236 ></TD | |
237 ><TD | |
238 WIDTH="33%" | |
239 ALIGN="right" | |
240 VALIGN="top" | |
241 >Audio Examples</TD | |
242 ></TR | |
243 ></TABLE | |
244 ></DIV | |
245 ></BODY | |
246 ></HTML | |
247 > |