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Author Topic: [TIGCC] 68k C  (Read 27903 times)

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saubue

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[TIGCC] 68k C
« Reply #30 on: January 05, 2006, 01:09:00 pm »
Yeah, I'm checking the TIGCC HP twice or more a day for new versions  :woot:woot.gif
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Liazon

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[TIGCC] 68k C
« Reply #31 on: January 05, 2006, 02:24:00 pm »
Is there a way to write a sprite to a buffer and then put the entire thing on the screen?

It just seems to me that the sprite functions just put a sprite directly onto the screen.  So when dealing with two different sprites, both sprites do not instantaneously show up on the screen.  Well, you probably don't notice because of the 68k speed.
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saubue

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[TIGCC] 68k C
« Reply #32 on: January 05, 2006, 02:43:00 pm »
Of course! :)smile.gif

c1-->
CODE
ec1
void *vplane;

// Allocate space for the virtual plane
if ((vplane = malloc(LCD_SIZE)) == NULL)
{
 
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Liazon

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[TIGCC] 68k C
« Reply #33 on: January 10, 2006, 09:25:00 am »
My head is getting pulverized into dust.

I finally got a chance to download Extgraph 2.xx and look at it's readme, and I was just totally blown into pieces by the complexity of the arguments that need to be passed to the complex greyscale clipped sprite functions.  I couldn't even tell what other functions did.

Perhaps I should work with the greyscale built into TIGCC .96 beta right now and just understand the basic concept.  I just don't get what all the gray.h commands do.
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saubue

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[TIGCC] 68k C
« Reply #34 on: January 10, 2006, 10:21:00 am »
:Dbiggrin.gif

The concept of Grayscale is easy: since the calculator can only turn pixels off and on, two planes are initialized and switched all the time. One plane is shown a little longer than the other; its name is DARK_PLANE. That's the way it goes:

Pixel set on no plane:
White
Pixel set only on LIGHT_PLANE:
Light Gray
Pixel set only on DARK_PLANE:
Dark Gray
Pixel set on both planes:
Black

However, the ExtGraph functions are also easy to understand. Let's take a simple example:
c1-->
CODE
ec1
#include
#include "extgraph.h"

// A little block sprite
#define HEIGHT 8
unsigned char sprt[HEIGHT] =
{
 
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Liazon

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[TIGCC] 68k C
« Reply #35 on: January 10, 2006, 11:17:00 am »
QuoteBegin-saubue+10 January 2006, 16:21-->
QUOTE (saubue @ 10 January 2006, 16:21)
:Dbiggrin.gif

The concept of Grayscale is easy: since the calculator can only turn pixels off and on, two planes are initialized and switched all the time. One plane is shown a little longer than the other; its name is DARK_PLANE. That's the way it goes:

Pixel set on no plane:
White
Pixel set only on LIGHT_PLANE:
Light Gray
Pixel set only on DARK_PLANE:
Dark Gray
Pixel set on both planes:
Black

However, the ExtGraph functions are also easy to understand. Let's take a simple example:
c1-->
CODE
ec1
#include
#include "extgraph.h"

// A little block sprite
#define HEIGHT 8
unsigned char sprt[HEIGHT] =
{
 
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saubue

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[TIGCC] 68k C
« Reply #36 on: January 10, 2006, 11:22:00 am »
Yes :)smile.gif

But like I've already said, you can use Double-Buffering. Don't be fooled by the fact that the planes are switching, anyway: It is very fast.
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Liazon

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[TIGCC] 68k C
« Reply #37 on: January 10, 2006, 11:30:00 am »
I guess I must do some more reading on double buffering.  I assume the mask function in ext graph is so fast I can't tell that I had to do and logic then xor logic with 2 different functions.
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MathStuf

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[TIGCC] 68k C
« Reply #38 on: January 10, 2006, 01:22:00 pm »
Yes, ExtGraph is extremely fast. I have yet to overload it. Every single of my projects has it in it.
And the arguments get ingrained into your mind after awhile. I have links to the docs in my Programming folder for easy access too.
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saubue

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[TIGCC] 68k C
« Reply #39 on: January 11, 2006, 01:36:00 am »
Me too :Dbiggrin.gif
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Liazon

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[TIGCC] 68k C
« Reply #40 on: January 17, 2006, 03:47:00 am »
QuoteBegin-saubue+5 January 2006, 20:43-->
QUOTE (saubue @ 5 January 2006, 20:43)
Of course! :)smile.gif

c1-->
CODE
ec1
void *vplane;

// Allocate space for the virtual plane
if ((vplane = malloc(LCD_SIZE)) == NULL)
{
 
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Offline Ranman

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[TIGCC] 68k C
« Reply #41 on: January 17, 2006, 03:17:00 pm »
QuoteBegin-Liazon+17 January 2006, 9:47-->
QUOTE (Liazon @ 17 January 2006, 9:47)
Can I allocate 2 buffer planes and have the Extgraph GS functions write to those first, and then use memcpy to put them onto their respective light and dark planes?
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Ranman
Bringing Randy Glover's Jumpman to the TI-89 calculator. Download available at Ticalc.

Liazon

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[TIGCC] 68k C
« Reply #42 on: January 18, 2006, 10:06:00 am »
I'm sorry this is taking so long to get through my thick skull.  I guess that programming ASM for the past two months has put me in the habit of doing everything at the lowest level by myself.

In reality, I haven't had time to make a working sprite based C program.  I've mainly been reading the tutorials when I have time, and programming ASM at other times.  One of these days, I'll get a Turkey Hunt clone in GreyScale, on the 89.

edit:  What are the biggest sprites that I can do masked with Extgraph?
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arti

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[TIGCC] 68k C
« Reply #43 on: January 20, 2006, 10:53:00 am »
32 in width, indefinite height. For wider sprites though you can draw 2 separate sprites side by side.
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Liazon

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[TIGCC] 68k C
« Reply #44 on: January 20, 2006, 12:45:00 pm »
I mean, implement them and still have them move fast.  And tilemapping too.  and masked auto

edit:

How do you know when you need to optimize your C code?  What does BAD unoptimized C code look like?  I'm asking this mainly because I'm unfamiliar with what bad C code looks like.  
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