pmc/sdl.cc
author Markus Bröker <mbroeker@largo.dyndns.tv>
Sat, 13 Dec 2008 17:58:10 +0100
changeset 18 f3657061ec00
parent 9 c3fecc82ade6
permissions -rw-r--r--
conninfo construction error fixed committer: Markus Bröker <mbroeker@largo.homelinux.org>
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
9
c3fecc82ade6 standard tags for git projects
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 4
diff changeset
     1
/**
c3fecc82ade6 standard tags for git projects
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 4
diff changeset
     2
 * test/demos/pmc/sdl.cc
c3fecc82ade6 standard tags for git projects
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 4
diff changeset
     3
 * Copyright (C) 2008 Markus Broeker
4
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
     4
 */
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
     5
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
     6
#include <SDL/SDL.h>
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
     7
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
     8
#define max(a,b) (((a) > (b)) ? (a) : (b))
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
     9
#define min(a,b) (((a) < (b)) ? (a) : (b))
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    10
#define abs(a) (((a)<0) ? -(a) : (a))
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    11
#define sign(a) (((a)<0) ? -1 : (a)>0 ? 1 : 0)
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    12
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    13
void drawLine (SDL_Surface * s, int x1, int y1, int x2, int y2, Uint32 color)
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    14
{
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    15
    int d;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    16
    int x;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    17
    int y;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    18
    int ax;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    19
    int ay;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    20
    int sx;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    21
    int sy;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    22
    int dx;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    23
    int dy;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    24
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    25
    Uint8 *lineAddr;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    26
    Sint32 yOffset;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    27
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    28
    dx = x2 - x1;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    29
    ax = abs (dx) << 1;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    30
    sx = sign (dx);
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    31
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    32
    dy = y2 - y1;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    33
    ay = abs (dy) << 1;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    34
    sy = sign (dy);
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    35
    yOffset = sy * s->pitch;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    36
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    37
    x = x1;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    38
    y = y1;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    39
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    40
    lineAddr = ((Uint8 *) s->pixels) + (y * s->pitch);
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    41
    if (ax > ay) {              /* x dominant */
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    42
        d = ay - (ax >> 1);
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    43
        for (;;) {
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    44
            *((Uint16 *) (lineAddr + (x << 1))) = (Uint16) color;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    45
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    46
            if (x == x2) {
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    47
                return;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    48
            }
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    49
            if (d >= 0) {
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    50
                y += sy;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    51
                lineAddr += yOffset;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    52
                d -= ax;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    53
            }
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    54
            x += sx;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    55
            d += ay;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    56
        }
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    57
    } else {                    /* y dominant */
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    58
        d = ax - (ay >> 1);
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    59
        for (;;) {
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    60
            *((Uint16 *) (lineAddr + (x << 1))) = (Uint16) color;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    61
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    62
            if (y == y2) {
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    63
                return;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    64
            }
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    65
            if (d >= 0) {
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    66
                x += sx;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    67
                d -= ay;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    68
            }
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    69
            y += sy;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    70
            lineAddr += yOffset;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    71
            d += ax;
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    72
        }
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    73
    }
236f8f747073 pimp my code, a small xdemo
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
    74
}