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Author Topic: Prizm Useful Routines -- post here! -  (Read 3967 times) Bookmark and Share
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z80man
Casio Traitor
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Last Login: 04 September, 2012, 19:42:33
Date Registered: 26 December, 2010, 10:02:50
Location: City 17
Posts: 966


Total Post Ratings: +83

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« Reply #30 on: 25 October, 2011, 06:10:01 »
0
I assume you mean that the alpha color is supplied at runtime and is only a single bit of alpha meaning that every pixel is either opaque or fully transparent. Here's what I got, it should do the trick. It's pretty simple and do note that it doesn't support clipping so if you need that ask and I'll write another routine.

Edit: fixed bug
Edit2: fixed another bug

Code: Select All | Copy To Clipboard

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#define WIDTH 384
#define HEIGHT 216

short * VRAM = (short*) GetVRAMAddress();

void alphaSprite(int x, int y, int width, int height, short * bitmap, short alpha)
{
     int y_index;
     int x_index;
     short * base = y * WIDTH + x + VRAM;
     for (y_index = height; y_index > 0; --y_index, base += WIDTH - width)
     {
          for (x_index = width; x_index > 0; --x_index, ++base, ++bitmap)
          {
               if (*bitmap != alpha) *base = *bitmap;
          }
     }
}
« Last Edit: 25 October, 2011, 22:56:21 by z80man » Logged

List of stuff I need to do before September:
1. Finish the Emulator of the Casio Prizm (in active development)
2. Finish the the SH3 asm IDE/assembler/linker program (in active development)
3. Create a partial Java virtual machine  for the Prizm (not started)
4. Create Axe for the Prizm with an Axe legacy mode (in planning phase)
5. Develop a large set of C and asm libraries for the Prizm (some progress)
6. Create an emulator of the 83+ for the Prizm (not started)
7. Create a well polished game that showcases the ability of the Casio Prizm (not started)
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