- Re: Loading bitmaps with transparency? (Torsten Giebl)
(Bill Kendrick)
- Re: Loading bitmaps with transparency? (Torsten Giebl)
(Leo M. Cabrera)
- Re: Flickering and division by zero in Windows
(Andre de Leiradella)
- Universal binary crashing on iMac (Core2Duo) system (Lijith P)
- How to create an GDK window inside SDL? (Serjan Pruis)
- Re: How to create an GDK window inside SDL? (Torsten Giebl)
- Problem with not using fullscreen. (Chris Rajula)
Message: 1
Date: Sun, 4 Mar 2007 15:00:24 -0800
From: Bill Kendrick
Subject: Re: [SDL] Loading bitmaps with transparency? (Torsten Giebl)
To: “A list for developers using the SDL library. (includes
SDL-announce)”
Message-ID: <20070304230024.GE30220 at sonic.net>
Content-Type: text/plain; charset=us-ascii
On Sun, Mar 04, 2007 at 03:30:42PM +0700, Patricia Curtis wrote:
Its simple to use transparency just save your images as a PNG-24 which
will
give you 255 levels of transparency and you don’t have to do the colour
keying either.
SDL_Surface * gLoadedImage = SDL_DisplayFormatAlpha(IMG_Load(“
SomePNG.png”
));
Bad coding style. If IMG_Load() fails for some reason (file not found,
corrupted file, out of memory, etc.), you’ll be sending a NULL ptr to
SDL_DisplayFormatAlpha(). I imagine that’d cause a segfault
(aka SDL parachute launch).
Always check for NULL and for errors!
Of course, if I recall, they wanted to literally load Windows BitMaP
(.bmp)
files, as they were in an environment where SDL_Image library (and hence
IMG_Load(), and hence PNG support) was unavailable.
So for that, use BMP with a color-key.
–
-bill!
bill at newbreedsoftware.com
http://www.newbreedsoftware.com/
Message: 2
Date: Sun, 04 Mar 2007 18:06:03 -0800
From: “Leo M. Cabrera”
Subject: Re: [SDL] Loading bitmaps with transparency? (Torsten Giebl)
To: “A list for developers using the SDL library. (includes
SDL-announce)”
Message-ID: <45EB7B0B.1090206 at gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Bad coding style. If IMG_Load() fails for some reason (file not found,
corrupted file, out of memory, etc.), you’ll be sending a NULL ptr to
SDL_DisplayFormatAlpha(). I imagine that’d cause a segfault
(aka SDL parachute launch).
Ha, yes, I do the same thing… embarrass
I always say; “I’ll do this now, then I’ll add error checking whenever I
finish the proggy…”
But when I finish it, I forget… gotta improve that. xD
Bill Kendrick wrote:
On Sun, Mar 04, 2007 at 03:30:42PM +0700, Patricia Curtis wrote:
Its simple to use transparency just save your images as a PNG-24 which
will
give you 255 levels of transparency and you don’t have to do the colour
keying either.
SDL_Surface * gLoadedImage = SDL_DisplayFormatAlpha(IMG_Load(“
SomePNG.png”
));
Bad coding style. If IMG_Load() fails for some reason (file not found,
corrupted file, out of memory, etc.), you’ll be sending a NULL ptr to
SDL_DisplayFormatAlpha(). I imagine that’d cause a segfault
(aka SDL parachute launch).
Always check for NULL and for errors!
Of course, if I recall, they wanted to literally load Windows BitMaP
(.bmp)
files, as they were in an environment where SDL_Image library (and hence
IMG_Load(), and hence PNG support) was unavailable.
So for that, use BMP with a color-key.
Message: 3
Date: Sun, 04 Mar 2007 20:40:18 -0300
From: Andre de Leiradella
Subject: Re: [SDL] Flickering and division by zero in Windows
To: sdl at lists.libsdl.org
Message-ID: <45EB58E2.1010005 at bigfoot.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
– set the video mode
local screen = image_lib.set_video(800, 600)
– load and resize the background
local background = image_lib.load(‘background.png’)
background = background.resize(screen.width, screen.height)
– evaluates a half-transparent black color
local transparent = image_lib.color(0, 0, 0, 128)
– loop until the user presses the left mouse button
while true do
– query the mouse
x, y, left = input_lib.mouse()
– blit the background to the screen, covering all pixels
background.blit(screen, 0, 0)
– fill a square with the half-transparent black
screen.filled_rect(10, 10, screen.width - 10, screen.width - 10,
transparent)
– update the screen
screen.update()
– if left mouse button was pressed, break the loop
if left then
break
end
end
I have found the problem. Blame me, I was setting up a one-second,
repeating timer that was calling SDL_UpdateRect. When I removed the
SDL_UpdateRect from the timer the flickering went away.
Sorry for the noise…
Andre
Message: 4
Date: Mon, 5 Mar 2007 12:23:48 +0530
From: “Lijith P”
Subject: [SDL] Universal binary crashing on iMac (Core2Duo) system
To: sdl at libsdl.org
Message-ID:
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
HI,
I am trying to built a universal binary application using xcode 2.3 and
sdl
framework…
The application works finely on the ppc… But when i try to run the
application on an iMac (core2Duo) system , the application is crashing at
randomly… But when i disable one cpu , the application is running
properly…
My application has a main thread and a helper thread…
Is there any way to schedule multiple threads in a single processor on
a dual core
system…
Valuable suggestion regarding this are most welcome…
Regards
Lijith
Message: 5
Date: Mon, 5 Mar 2007 12:11:26 +0100
From: Serjan Pruis
Subject: [SDL] How to create an GDK window inside SDL?
To: “A list for developers using the SDL library. (includes
SDL-announce)”
Message-ID: <200703051211.26588.serjan at quicknet.nl>
Content-Type: text/plain; charset=“iso-8859-1”
Hi,
I’m trying to add an GTK/GDK window to my application,
Does any one already done this?
I am able to create a Xwindow with a window id so that i can give
the window id to mplayer so it can run in a window in my app.
But i also want to play flash files in my window and so i guess i need a
GDK
window.
Thanks in advance.
Serjan
Message: 6
Date: Mon, 5 Mar 2007 14:53:31 +0100
From: “Torsten Giebl”
Subject: Re: [SDL] How to create an GDK window inside SDL?
To: “A list for developers using the SDL library. (includes
SDL-announce)”
Message-ID:
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello !
I’m trying to add an GTK/GDK window to my application,
Does any one already done this?
I am able to create a Xwindow with a window id so that i can give
the window id to mplayer so it can run in a window in my app.
But i also want to play flash files in my window and so i guess i need a
GDK
window.
Sam Lantinga has done something like this :
http://www.libsdl.org/projects/gtk-demo/
CU
Message: 7
Date: Mon, 5 Mar 2007 15:45:41 +0100
From: “Chris Rajula”
Subject: [SDL] Problem with not using fullscreen.
To: sdl at lists.libsdl.org
Message-ID:
<630acb5b0703050645k6ba6d1dxccb7a71b538a5541 at mail.gmail.com>
Content-Type: text/plain; charset=“iso-8859-1”
Hello there!
I have written a small testing-program that uses OpenGL and creates a
window, but I have a small problem, namely that I can’t get it not to use
fullscreen.
Using the program to draw a circle or whatever works just fine, but I
can’t
get it to create a windowed window…
I have the program divided into three separate files. One program-file,
one
class-file and one file containing the functions for the class.
I appreciate any help.
Thank you.
/Chris
Here we go:
window.h:
#ifndef _draw_h
#define _draw_h
class window{
private:
int height;
int width;
int depth;
bool debug;
bool fullscreen;
public:
window();
window(int w, int h, int d, bool fs);
void SDLInit();
void Event();
~window();
};
#endif
window.cpp:
#ifdef WIN32
#include <windows.h>
#endif
#include
#include <SDL.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include “window.h”
window::window(){
debug = 1;
width = 640;
height = 480;
depth = 32;
fullscreen = false;
if(debug == 1)
std::cout << “Height, width, and depth specified.\n”;
}
window::window(int w,int h,int d,bool fs){
if(fs == true) fullscreen = true;
else fullscreen = false;
if(h == 0) h = 1;
if(w == 0) w = 1;
if(d == 0) d = 32;
width = w;
height = h;
depth = d;
if(debug == 1)
std::cout << “Height, width, and depth specifically
specified.\n”;
}
void window::SDLInit(){
int error;
// Just initialize everything and check for errors. Keep it simple,
stupid. FIXME Check the error flag.
error = SDL_Init(SDL_INIT_EVERYTHING);
// std::cout << SDL_GetError();
// I keep getting “Failed loading DPMSDisable:
/usr/lib/libX11.so.6:
undefined symbol” here.
// It has something to do with SDLinitializing video, but I don’t
think it’s a problem.
// Here we set the different attributes for the drawing context.
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); // Double
buffering.
(Draw on offscreen buffer, then move to screen.)
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, depth); // Depth of the
buffer.
// Be sure to allocate space for the different colors to 8 bits,
since we use a depth of 32 bits. FIXME (8/colour for 32bit depth!)
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8); // Red
colour.
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8); // Green colour.
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8); // Blue
colour.
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8); // Transparency.
// Creating an SDL surface.
Uint32 flags; // Used for choosing how the drawing context should
act.
if(fullscreen == true) flags = SDL_OPENGL | SDL_FULLSCREEN;
else flags = SDL_OPENGL;
SDL_Surface* drawContext;
// Create the OpenGL draw context.
drawContext = SDL_SetVideoMode(width,height,depth,flags);
}
void window::Event(){
SDL_Event event;
bool exit = false;
while((!exit) && (SDL_WaitEvent(&event))) {
switch(event.type) {
case SDL_KEYDOWN:
exit = true;
break;
case SDL_MOUSEBUTTONDOWN:
exit = true;
break;
}
}
}
window::~window(){
SDL_Quit();
}
test.cpp:
#include
#include “window.h”
int main(int argc, char *argv[]){
bool fs = true;
window window;
//window window(100,100,32,fs);
window.SDLInit();
// The main function should here call some different stuff.
// Preferences();
// It should enable or disable antialiasing and such, and read
values from a file of user preferences.
// It should also call a specific first-run-function to set the
initial values for the user.
window.Event();
return 0;
}
-------------- next part --------------
An HTML attachment was scrubbed…
URL:
http://lists.libsdl.org/pipermail/sdl-libsdl.org/attachments/20070305/deb73c87/attachment.html
SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org
End of SDL Digest, Vol 3, Issue 10
