Messages

1

General / (SOLVED) Setup issues

« on: February 18, 2016, 04:58:16 am »

SOLVED: I forgot to to replace the old with new graphics, system, and window DLLs in the project's build folder.

-------------------------------------------------------
Original:
SFML was properly setup a couple of years ago (Windows, CodeBlocks 13).
Now, after updating to CodeBlocks 16, I am getting errors.

Downloaded SFML 2.3.2 from source and recompiled (using default Cmake settings) from instructions here:
http://www.sfml-dev.org/tutorials/2.3/compile-with-cmake.php
http://www.sfml-dev.org/tutorials/2.3/start-cb.php

Still getting errors.

---------------------------
Game01.exe - Entry Point Not Found
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The procedure entry point _ZN2sf6Window6createENS_9VideoModeERKNS_6StringEjRKNS_15ContextSettingsE could not be located in the dynamic link library C:\Users\Thomas\AnTh\A0_UNI-Boulder\CSCI2270 DataStructures\HW12-SnakeGameAI\Code\Game01.exe.
---------------------------
OK   
---------------------------

2

Graphics / Re: How to draw a *single* vertex ?

« on: May 28, 2013, 11:20:45 pm »

Thank you.
I will look into that approach and adjust accordingly.

3

Graphics / Re: How to draw a *single* vertex ?

« on: May 28, 2013, 09:10:05 pm »

That means I would have to waste a vertex array per shape; instead of a vertex array for the WHOLE system. Using more vertices per particle would kill performance. No? (both in number of vertices and multiple draw calls)

Or, it would have to be a vertex array of quads (is this even possible; vertex array or vertex arrays) ? And each quad having a circle texture assigned to it ? (even this already quadruples the computational load)

Can all these shapes be drawn in sfml with a single call to window.draw ?

4

Graphics / Re: How to draw a *single* vertex ?

« on: May 28, 2013, 09:04:09 pm »

I am going for something like this:


Being able to assign a changing texture to each particle depending on certain conditions of speed, or pressure... all without sacrificing performance (if possible). I just need to display a 20x20 texture (out of a pool of textures) by its middle assigned to each particle

5

Graphics / Re: How to draw a *single* vertex ?

« on: May 28, 2013, 08:18:48 pm »

Speaking of textures ... I don't see any examples about texturing a single vertex as an independent particle.
So far I know how to set the coordinates of displaying a texture on a vertex, but the method of actually showing a texture at those coordinates is rather mystical to me.

I see for vertex arrays, the texture is displayed from the Window.draw(vertices, &texture); but that would not work for particle vertices each having their own texture.

6

Graphics / Re: How to draw a *single* vertex ?

« on: May 19, 2013, 03:41:32 am »

There's an example of a particle system that draws particles as single points in the tutorial, can't you use a similar approach?

Laurent, I read your example and I feel I understand your approach on that simple particle system.

... the question now becomes is it possible to have a particle system where each particle is a simple shape (square, circle, triangle etc) ? Sounds like a vertexArray of vertexArrays.

As such, is it possible to have a single call to window.draw(....) that puts a cluster of circles on screen ? (assuming we want to do this with actual vertex geometry instead of using textures that represent circles or sprites)

7

Graphics / Re: How to draw a *single* vertex ?

« on: May 18, 2013, 11:15:26 am »

What would be the optimum way to handle a particle system wherein each particle has more properties than merely position, or texture (in my case there is a number of other properties; elasticity, surf friction, magnetic coef, mass, etc etc)

Should it be an array of class objects for the properties and a separate vertexArray ? ... and then try to keep their indices synchronized ? (It seems to me if I add a single vertex as a member within the particle class-object, then I'd have to iterate through the class-object array to create a new vertex array for drawing ... which likely creates memory overhead and too much allocation/deallocation, I think.)

8

Graphics / Re: How to draw a *single* vertex ?

« on: May 18, 2013, 10:41:11 am »

Thank you for this tip! I will modify my design to make use of vertex arrays and reduce calls to "draw".

9

Graphics / Re: How to draw a *single* vertex ?

« on: May 18, 2013, 09:27:18 am »

The worst performance ... is that due to repeated calls to Window.draw(....) ?

10

Graphics / Re: How to draw a *single* vertex ?

« on: May 18, 2013, 09:18:13 am »

Thank you. I will try that.

Reason being, I have a simple particle system that displays either points or circles (or other shapes). So I already have a defined array of single entities and it seems like a waste having to copy an existing array to a vertex array when points are to be shown.

11

Graphics / How to draw a *single* vertex ?

« on: May 18, 2013, 08:41:53 am »

I see a lot of documentation about vertex arrays ... but how can we draw a *single* vertex ?

12

General / Re: sfml 2.0 undefined reference to getDefaultFont

« on: April 26, 2013, 07:04:22 am »

Yup !
Your example works.

I see you used the explicit constructor:  sf::Text text("hello", font, 30);
That was the key (although I thought I tried that explicit call earlier, maybe something else got in the way)

In any case if I use only  sf::Text text("hello");
it complains, but I don't care :-)  ... I got text now !

Thank you for your help on this.

13

General / Re: sfml 2.0 undefined reference to getDefaultFont

« on: April 26, 2013, 01:06:51 am »

aaahm, thanks for the ideas ... but I am confused still :-)

I downloaded SFML 2.0 from this website directly, back in December (5months ago ? I believe) and I remember taking the extra steps to make a clean installation, as a matter of fact I spent a bit of time understanding how to built/compile SFML for my system ... and I remember it went smoothly with no errors at the time. (Of course I have forgotten most of those methods now, but I do remember having to download a few open source tools).

In any case, I have been writing a small game the past two weeks with no errors, that is until I tried to add some text elements yesterday. (It gives the same error regardless of whether I explicitly specify a font, or leave font info completely out)

So you guys think everything is properly linked except the text headers ? (by saying "everything" ... well I haven't checked audio, but so far keyboard, mouse, and graphics are fine)

14

General / sfml 2.0 undefined reference to getDefaultFont

« on: April 25, 2013, 06:39:35 am »

I am writing a simple game and so far all works well, with graphics and keyboard working well, but ...
... today for the first time I am trying to add some text elements and get this error.

Just doing the text sample from the doc page:
(And I have the Arial.ttf in the local folder)

// Declare and load a font
 sf::Font font;
 font.loadFromFile("arial.ttf");
 
 // Create a text
 sf::Text text("hello");
 text.setFont(font);
 text.setCharacterSize(30);
 text.setStyle(sf::Text::Bold);
 text.setColor(sf::Color::Red);

 // Draw it
 window.draw(text);

15

General / Re: Graphics tut for SFML 2.0

« on: February 15, 2013, 03:52:47 am »

Alright. Thank you !