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annotate XCodeiPhoneOS/Demos/src/mixer.c @ 2461:f8cd2eecde64 gsoc2008_iphone

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grammar, typos
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Mon, 18 Aug 2008 18:02:43 +0000
parents 6a946f3155d8
children
rev   line source
2384
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1 /*
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2 * mixer.c
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3 * written by Holmes Futrell
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4 * use however you want
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5 */
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6
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7 #import "SDL.h"
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8 #import "common.h"
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9
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10 #define NUM_CHANNELS 8 /* max number of sounds we can play at once */
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11 #define NUM_DRUMS 4 /* number of drums in our set */
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12 #define MILLESECONDS_PER_FRAME 16 /* about 60 frames per second */
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13
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14 static struct {
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15 SDL_Rect rect; /* where the button is drawn */
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16 SDL_Color upColor; /* color when button is not active */
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17 SDL_Color downColor; /* color when button is active */
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18 int isPressed; /* is the button being pressed ? */
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19 int touchIndex; /* what mouse (touch) index pressed the button ? */
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20 } buttons[NUM_DRUMS];
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21
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22 struct sound {
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23 Uint8 *buffer; /* audio buffer for sound file */
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24 Uint32 length; /* length of the buffer (in bytes) */
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25 };
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26
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27 /* this array holds the audio for the drum noises */
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28 static struct sound drums[NUM_DRUMS];
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29
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30 /* function declarations */
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31 void handleMouseButtonDown(SDL_Event *event);
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32 void handleMouseButtonUp(SDL_Event *event);
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33 int playSound(struct sound *);
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34 void render(void);
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35 void initializeButtons();
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36 void audioCallback(void *userdata, Uint8 *stream, int len);
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37 void loadSound(const char *file, struct sound *s);
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38
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39 struct {
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40 /* channel array holds information about currently playing sounds */
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41 struct {
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42 Uint8 *position; /* what is the current position in the buffer of this sound ? */
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43 Uint32 remaining; /* how many bytes remaining before we're done playing the sound ? */
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44 Uint32 timestamp; /* when did this sound start playing ? */
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45 } channels[NUM_CHANNELS];
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46 SDL_AudioSpec outputSpec; /* what audio format are we using for output? */
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47 int numSoundsPlaying; /* how many sounds are currently playing */
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48 } mixer;
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49
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50 /* sets up the buttons (color, position, state) */
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51 void initializeButtons() {
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52
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53 int i;
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54 int spacing = 10; /* gap between drum buttons */
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55 SDL_Rect buttonRect; /* keeps track of where to position drum */
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56 SDL_Color upColor = { 86, 86, 140, 255 }; /* color of drum when not pressed */
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57 SDL_Color downColor = { 191, 191, 221, 255 }; /* color of drum when pressed */
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58
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59 buttonRect.x = spacing;
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60 buttonRect.y = spacing;
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61 buttonRect.w = SCREEN_WIDTH - 2 * spacing;
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62 buttonRect.h = ( SCREEN_HEIGHT - (NUM_DRUMS + 1) * spacing ) / NUM_DRUMS;
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63
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64 /* setup each button */
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65 for (i=0; i<NUM_DRUMS; i++) {
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66
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67 buttons[i].rect = buttonRect;
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68 buttons[i].isPressed = 0;
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69 buttons[i].upColor = upColor;
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70 buttons[i].downColor = downColor;
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71
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72 buttonRect.y += spacing + buttonRect.h; /* setup y coordinate for next drum */
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73
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74 }
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75 }
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76 /*
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77 loads a wav file (stored in 'file'), converts it to the mixer's output format,
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78 and stores the resulting buffer and length in the sound structure
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79 */
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80 void loadSound(const char *file, struct sound *s) {
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81 SDL_AudioSpec spec; /* the audio format of the .wav file */
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82 SDL_AudioCVT cvt; /* used to convert .wav to output format when formats differ */
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83 int result;
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84 if (SDL_LoadWAV(file, &spec, &s->buffer, &s->length) == NULL) {
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85 fatalError("could not load .wav");
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86 }
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87 /* build the audio converter */
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88 result = SDL_BuildAudioCVT(&cvt, spec.format, spec.channels, spec.freq,
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89 mixer.outputSpec.format, mixer.outputSpec.channels, mixer.outputSpec.freq);
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90 if (result == -1) {
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91 fatalError("could not build audio CVT");
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92 }
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93 else if (result != 0) {
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94 /*
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95 this happens when the .wav format differs from the output format.
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96 we convert the .wav buffer here
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97 */
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98 cvt.buf = (Uint8 *)SDL_malloc(s->length * cvt.len_mult); /* allocate conversion buffer */
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99 cvt.len = s->length; /* set conversion buffer length */
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100 SDL_memcpy(cvt.buf, s->buffer, s->length); /* copy sound to conversion buffer */
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101 if (SDL_ConvertAudio(&cvt) == -1) { /* convert the sound */
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102 fatalError("could not convert .wav");
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103 }
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104 SDL_free(s->buffer); /* free the original (unconverted) buffer */
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105 s->buffer = cvt.buf; /* point sound buffer to converted buffer */
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106 s->length = cvt.len_cvt; /* set sound buffer's new length */
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107 }
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108 }
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109
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110 /* called from main event loop */
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111 void handleMouseButtonDown(SDL_Event *event) {
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112
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113 int x, y, mouseIndex, i, drumIndex;
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114
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115 mouseIndex = event->button.which;
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116 drumIndex = -1;
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117
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118 SDL_SelectMouse(mouseIndex);
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119 SDL_GetMouseState(&x, &y);
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120 /* check if we hit any of the drum buttons */
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121 for (i=0; i<NUM_DRUMS; i++) {
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122 if (x >= buttons[i].rect.x && x < buttons[i].rect.x + buttons[i].rect.w \
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123 && y >= buttons[i].rect.y && y < buttons[i].rect.y + buttons[i].rect.h) {
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124 drumIndex = i;
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125 break;
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126 }
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127 }
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128 if (drumIndex != -1) {
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129 /* if we hit a button */
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130 buttons[drumIndex].touchIndex = mouseIndex;
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131 buttons[drumIndex].isPressed = 1;
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132 playSound(&drums[drumIndex]);
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133 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
134
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
135 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
136
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
137 /* called from main event loop */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
138 void handleMouseButtonUp(SDL_Event *event) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
139 int i;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
140 int mouseIndex = event->button.which;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
141 /* check if this should cause any of the buttons to become unpressed */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
142 for (i=0; i<NUM_DRUMS; i++) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
143 if (buttons[i].touchIndex == mouseIndex) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
144 buttons[i].isPressed = 0;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
145 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
146 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
147 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
148
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
149 /* draws buttons to screen */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
150 void render(void) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
151 int i;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
152 SDL_RenderFill(50, 50, 50, 255, NULL); /* draw background (gray) */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
153 /* draw the drum buttons */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
154 for (i=0; i<NUM_DRUMS; i++) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
155 SDL_Color color = buttons[i].isPressed ? buttons[i].downColor : buttons[i].upColor;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
156 SDL_RenderFill(color.r, color.g, color.b, color.unused, &buttons[i].rect);
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
157 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
158 /* update the screen */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
159 SDL_RenderPresent();
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
160 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
161
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
162 /*
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
163 finds a sound channel in the mixer for a sound
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
164 and sets it up to start playing
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
165 */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
166 int playSound(struct sound *s) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
167 /*
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
168 find an empty channel to play on.
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
169 if no channel is available, use oldest channel
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
170 */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
171 int i;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
172 int selected_channel = -1;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
173 int oldest_channel = 0;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
174
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
175 if (mixer.numSoundsPlaying == 0) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
176 /* we're playing a sound now, so start audio callback back up */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
177 SDL_PauseAudio(0);
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
178 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
179
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
180 /* find a sound channel to play the sound on */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
181 for (i=0; i<NUM_CHANNELS; i++) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
182 if (mixer.channels[i].position == NULL) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
183 /* if no sound on this channel, select it */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
184 selected_channel = i;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
185 break;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
186 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
187 /* if this channel's sound is older than the oldest so far, set it to oldest */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
188 if (mixer.channels[i].timestamp < mixer.channels[oldest_channel].timestamp)
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
189 oldest_channel = i;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
190 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
191
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
192 /* no empty channels, take the oldest one */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
193 if (selected_channel == -1)
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
194 selected_channel = oldest_channel;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
195 else
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
196 mixer.numSoundsPlaying++;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
197
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
198 /* point channel data to wav data */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
199 mixer.channels[selected_channel].position = s->buffer;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
200 mixer.channels[selected_channel].remaining = s->length;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
201 mixer.channels[selected_channel].timestamp = SDL_GetTicks();
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
202
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
203 return selected_channel;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
204 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
205
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
206 /*
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
207 Called from SDL's audio system. Supplies sound input with data by mixing together all
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
208 currently playing sound effects.
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
209 */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
210 void audioCallback(void *userdata, Uint8 *stream, int len) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
211 int i;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
212 int copy_amt;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
213 SDL_memset(stream, mixer.outputSpec.silence, len); /* initialize buffer to silence */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
214 /* for each channel, mix in whatever is playing on that channel */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
215 for (i=0; i<NUM_CHANNELS; i++) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
216 if (mixer.channels[i].position == NULL) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
217 /* if no sound is playing on this channel */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
218 continue; /* nothing to do for this channel */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
219 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
220
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
221 /* copy len bytes to the buffer, unless we have fewer than len bytes remaining */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
222 copy_amt = mixer.channels[i].remaining < len ? mixer.channels[i].remaining : len;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
223
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
224 /* mix this sound effect with the output */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
225 SDL_MixAudioFormat(stream, mixer.channels[i].position, mixer.outputSpec.format, copy_amt, 150);
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
226
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
227 /* update buffer position in sound effect and the number of bytes left */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
228 mixer.channels[i].position += copy_amt;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
229 mixer.channels[i].remaining -= copy_amt;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
230
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
231 /* did we finish playing the sound effect ? */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
232 if (mixer.channels[i].remaining == 0) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
233 mixer.channels[i].position = NULL; /* indicates no sound playing on channel anymore */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
234 mixer.numSoundsPlaying--;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
235 if (mixer.numSoundsPlaying == 0) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
236 /* if no sounds left playing, pause audio callback */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
237 SDL_PauseAudio(1);
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
238 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
239 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
240 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
241 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
242
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
243 int main(int argc, char *argv[]) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
244
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
245 int done; /* has user tried to quit ? */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
246 SDL_WindowID windowID; /* our main window */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
247 SDL_Event event;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
248 Uint32 startFrame; /* holds when frame started processing */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
249 Uint32 endFrame; /* holds when frame ended processing */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
250 Uint32 delay; /* calculated delay, how long should we wait before next frame? */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
251
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
252 if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO) < 0) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
253 fatalError("could not initialize SDL");
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
254 }
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
255 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_OPENGL | SDL_WINDOW_BORDERLESS);
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
256 SDL_CreateRenderer(windowID, 0, 0);
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
257
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
258 /* initialize the mixer */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
259 SDL_memset(&mixer, 0, sizeof(mixer));
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
260 /* setup output format */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
261 mixer.outputSpec.freq = 44100;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
262 mixer.outputSpec.format = AUDIO_S16LSB;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
263 mixer.outputSpec.channels = 2;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
264 mixer.outputSpec.samples = 256;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
265 mixer.outputSpec.callback = audioCallback;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
266 mixer.outputSpec.userdata = NULL;
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
267
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
268 /* open audio for output */
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
269 if (SDL_OpenAudio(&mixer.outputSpec, NULL) != 0) {
6a946f3155d8 Drum kit demo (SDL_mixer)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
270 fatalError("Opening audio failed");
6a946f3155d8 Drum kit demo (SDL_mixer)
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271 }
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272
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273 /* load our drum noises */
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274 loadSound("ds_kick_big_amb.wav", &drums[3]);
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275 loadSound("ds_brush_snare.wav", &drums[2]);
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276 loadSound("ds_loose_skin_mute.wav", &drums[1]);
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277 loadSound("ds_china.wav", &drums[0]);
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278
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279 /* setup positions, colors, and state of buttons */
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280 initializeButtons();
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281
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282 /* enter main loop */
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283 done = 0;
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284 while(!done) {
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285 startFrame = SDL_GetTicks();
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286 while (SDL_PollEvent(&event)) {
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287 switch(event.type) {
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288 case SDL_MOUSEBUTTONDOWN:
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289 handleMouseButtonDown(&event);
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290 break;
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291 case SDL_MOUSEBUTTONUP:
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292 handleMouseButtonUp(&event);
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293 break;
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294 case SDL_QUIT:
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295 done = 1;
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296 break;
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297 }
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298 }
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299 render(); /* draw buttons */
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300 endFrame = SDL_GetTicks();
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301
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302 /* figure out how much time we have left, and then sleep */
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303 delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
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304 if (delay < 0) {
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305 delay = 0;
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306 } else if (delay > MILLESECONDS_PER_FRAME) {
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307 delay = MILLESECONDS_PER_FRAME;
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308 }
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309 SDL_Delay(delay);
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310 }
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311
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312 /* cleanup code, let's free up those sound buffers */
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313 int i;
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314 for (i=0; i<NUM_DRUMS; i++) {
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315 SDL_free(drums[i].buffer);
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316 }
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317 /* let SDL do its exit code */
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318 SDL_Quit();
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319
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320 return 0;
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321 }