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1 /********************
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2
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3 OCSALiB, the revolutionary -- version 0.0.1alpha
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4
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5 (c) viznut/ocsa '98 vheikkil@hytti.uku.fi
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6
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7 use it the way you like, i don't care :)
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8
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9 ***************/
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10
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11 typedef struct {int r,g,b; } rgb;
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12
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13 extern void oxl_setpalette(rgb *pal);
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14 extern void oxl_doframe(char *vscr);
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15 extern int oxl_timer(void);
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16 extern void oxl_doaudio(int*(player()));
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17 extern void oxl_init_video(void);
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18 extern void oxl_init_audio(int rowtix);
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19 extern void oxl_init_timer(void);
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20 extern void oxl_end(void);
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21
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22 extern int AUFREQ, TIKLGT;
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23
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24 /*x.
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25
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26 Just in case you _may_ want to use this in your own proggie (urgh)
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27 let's put some documentation here :)
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28
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29 ** FUNCTIONS **
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30
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31 void oxl_setpalette(rgb *pal)
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32
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33 pal is a table containing three ints (r,g,b) for every color.
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34 the values vary 0..255.
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35
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36 void oxl_doframe(char *vscr)
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37
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38 blits the contents of the offscreen buffer to the screen.
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39 the size of the buffer is BUFW * BUFH * 8 bits.
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40
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41 int oxl_timer(void)
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42
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43 the current timer value. the number of timer ticks per second is
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44 defined by the DEMOHZ constant.
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45
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46 void oxl_doaudio(int*(player()));
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47
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48 fills the audio output buffers up to 50%.
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49
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50 player is a user-specified function returning a pointer to some raw
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51 audio data (e.g. the mixer output for the next row of a pattern)
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52
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53 the first int of the data is the length of the rest (in ints).
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54
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55 the buffer is int* but the data is 16bit unsigned. values going out
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56 of the range 0..65535 will be clipped.
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57
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58 AUFREQ specifies the output frequency.
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59
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60 void oxl_init_video(void);
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61
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62 adjusts the display for the demo.
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63 oxl_doframe and oxl_setpalette need this.
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64
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65 void oxl_init_audio(int rowtix);
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66
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67 inits the audio stuff, possibly changing the value of AUFREQ.
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68 rowtix is the maximum length (in ticks) of an audio chunk produced
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69 by int*(player()). (the 'physical length' in samples is therefore
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70 rowtix*AUFREQ/DEMOHZ)
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71
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72 oxl_doaudio needs this. does nothing if nosound.
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73
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74 void oxl_init_timer(void);
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75
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76 starts the timer. oxl_timer needs this.
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77
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78 with sounds on, the timing is actually based on the byte counter of
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79 the sound device but put this in your code anyway.
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80
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81 void oxl_end(void);
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82
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83 closes the multimedia subsystems. these things should be done
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84 automatically when the program terminates, so you really don't need
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85 this function.
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86
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87 ** CONSTANTS REQUIRED **
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88
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89 AUDIO (0/1)
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90 VIDEO (vga/X11)
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91 BUFW, BUFH (buffer size)
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92 DEMOHZ (timer ticks per second)
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93
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94 ** THINGS TO DO **
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95
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96 - A guard process that tries to keep up the audio even if the main
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97 loop is frozen. (e.g. if the svgalib screen is not active or if
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98 you move the window in X)
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99
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100 - Make sure the window start address is properly aligned for the
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101 maximum performance.
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102
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103 - Do not calculate the contents of the buffer if the screen/window
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104 is not visible.
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105
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106 - A variable palette size: if the palette fits in the end of the
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107 default colormap, we have to be able to use it instead of rudely
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108 using a private map.
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109
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110 - Support for visual depths other than 8bpp.
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111
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112 - Support for 16-bit multimedia sound systems. Stereo?
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113
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114 - mSDoS support (for dummies)
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115
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116 - AAlib support
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117
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118 - An automatical reselection of X11 gfx mode to best fit the size of
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119 the buffer.
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120
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121 - X fullscreen mode
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122
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123 - X rootwindow mode
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124
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125 - Etc etc... but still trying to keep it in a relevant size ;)
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126
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127 .x*/
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