andrewm@13: /*
andrewm@13:  * render.cpp
andrewm@13:  *
andrewm@13:  *  Created on: Oct 24, 2014
andrewm@13:  *      Author: parallels
andrewm@13:  */
andrewm@13: 
andrewm@13: 
andrewm@13: #include "../../include/render.h"
andrewm@13: #include "../../include/Utilities.h"
andrewm@13: #include <rtdk.h>
andrewm@13: 
andrewm@13: // initialise_render() is called once before the audio rendering starts.
andrewm@13: // Use it to perform any initialisation and allocation which is dependent
andrewm@13: // on the period size or sample rate.
andrewm@13: //
andrewm@13: // userData holds an opaque pointer to a data structure that was passed
andrewm@13: // in from the call to initAudio().
andrewm@13: //
andrewm@13: // Return true on success; returning false halts the program.
andrewm@13: 
andrewm@13: bool initialise_render(int numMatrixChannels, int numAudioChannels,
andrewm@13: 					   int numMatrixFramesPerPeriod,
andrewm@13: 					   int numAudioFramesPerPeriod,
andrewm@13: 					   float matrixSampleRate, float audioSampleRate,
andrewm@13: 					   void *userData)
andrewm@13: {
andrewm@13: 	// Nothing to do here...
andrewm@13: 
andrewm@13: 	return true;
andrewm@13: }
andrewm@13: 
andrewm@13: // render() is called regularly at the highest priority by the audio engine.
andrewm@13: // Input and output are given from the audio hardware and the other
andrewm@13: // ADCs and DACs (if available). If only audio is available, numMatrixFrames
andrewm@13: // will be 0.
andrewm@13: 
andrewm@13: void render(int numMatrixFrames, int numAudioFrames, float *audioIn, float *audioOut,
andrewm@13: 			uint16_t *matrixIn, uint16_t *matrixOut)
andrewm@13: {
andrewm@13: 	// Simplest possible case: pass inputs through to outputs
andrewm@13: 	for(int n = 0; n < numAudioFrames; n++) {
andrewm@13: 		for(int ch = 0; ch < gNumAudioChannels; ch++)
andrewm@13: 			audioOut[n * gNumAudioChannels + ch] = audioIn[n * gNumAudioChannels + ch];
andrewm@13: 	}
andrewm@13: 
andrewm@13: 	// Same with matrix, only if matrix is enabled
andrewm@13: 	if(numMatrixFrames != 0) {
andrewm@13: 		for(int n = 0; n < numMatrixFrames; n++) {
andrewm@13: 			for(int ch = 0; ch < gNumMatrixChannels; ch++) {
andrewm@13: 				// Two equivalent ways to write this code
andrewm@13: 				// The long way, using the buffers directly:
andrewm@13: 				// matrixOut[n * gNumMatrixChannels + ch] = matrixIn[n * gNumMatrixChannels + ch];
andrewm@13: 
andrewm@13: 				// Or using the macros:
andrewm@13: 				analogWrite(ch, n, analogRead(ch, n));
andrewm@13: 			}
andrewm@13: 		}
andrewm@13: 	}
andrewm@13: }
andrewm@13: 
andrewm@13: // cleanup_render() is called once at the end, after the audio has stopped.
andrewm@13: // Release any resources that were allocated in initialise_render().
andrewm@13: 
andrewm@13: void cleanup_render()
andrewm@13: {
andrewm@13: 
andrewm@13: }