Texture::Texture( const Channel32f &channel, Format format )
: mObj( shared_ptr<Obj>( new Obj( channel.getWidth(), channel.getHeight() ) ) )
{
#if defined( CINDER_MAC )
bool supportsTextureFloat = gl::isExtensionAvailable( "GL_ARB_texture_float" );
#elif defined( CINDER_MSW )
bool supportsTextureFloat = GLEE_ARB_texture_float != 0;
#endif
if( format.mInternalFormat < 0 ) {
#if ! defined( CINDER_GLES )
if( supportsTextureFloat )
format.mInternalFormat = GL_LUMINANCE32F_ARB;
else
format.mInternalFormat = GL_LUMINANCE;
#else
format.mInternalFormat = GL_LUMINANCE;
#endif
}
mObj->mInternalFormat = format.mInternalFormat;
mObj->mTarget = format.mTarget;
// if the data is not already contiguous, we'll need to create a block of memory that is
if( ( channel.getIncrement() != 1 ) || ( channel.getRowBytes() != channel.getWidth() * sizeof(float) ) ) {
shared_ptr<float> data( new float[channel.getWidth() * channel.getHeight()], checked_array_deleter<float>() );
float *dest = data.get();
const int8_t inc = channel.getIncrement();
const int32_t width = channel.getWidth();
for( int y = 0; y < channel.getHeight(); ++y ) {
const float *src = channel.getData( 0, y );
for( int x = 0; x < width; ++x ) {
*dest++ = *src;
src += inc;
}
}
init( data.get(), GL_LUMINANCE, format );
}
else
init( channel.getData(), GL_LUMINANCE, format );
}
void AudioVisualizerApp::setup()
{
// initialize signals
signalChannelEnd = false;
// make a list of valid audio file extensions and initialize audio variables
const char* extensions[] = { "mp3", "wav", "ogg" };
mAudioExtensions = vector<string>( extensions, extensions + 2 );
mAudioPath = getAssetPath( "" );
mIsAudioPlaying = false;
// setup camera
mCamera.setPerspective( 50.0f, 1.0f, 1.0f, 10000.0f );
mCamera.lookAt( vec3( -kWidth / 4, kHeight / 2, -kWidth / 8 ), vec3( kWidth / 4, -kHeight / 8, kWidth / 4 ) );
mCameraUi.setCamera( &mCamera );
// create channels from which we can construct our textures
mChannelLeft = Channel32f( kBands, kHistory );
mChannelRight = Channel32f( kBands, kHistory );
memset( mChannelLeft.getData(), 0, mChannelLeft.getRowBytes() * kHistory );
memset( mChannelRight.getData(), 0, mChannelRight.getRowBytes() * kHistory );
// create texture format (wrap the y-axis, clamp the x-axis)
mTextureFormat.setWrapS( GL_CLAMP_TO_BORDER );
mTextureFormat.setWrapT( GL_REPEAT );
mTextureFormat.setMinFilter( GL_LINEAR );
mTextureFormat.setMagFilter( GL_LINEAR );
mTextureFormat.loadTopDown( true );
// compile shader
try {
mShader = gl::GlslProg::create( loadAsset( "shaders/spectrum.vert" ), loadAsset( "shaders/spectrum.frag" ) );
}
catch( const std::exception& e ) {
console() << e.what() << std::endl;
quit();
return;
}
// create static mesh (all animation is done in the vertex shader)
std::vector<vec3> positions;
std::vector<Colorf> colors;
std::vector<vec2> coords;
std::vector<uint32_t> indices;
for( size_t h = 0; h < kHeight; ++h ) {
for( size_t w = 0; w < kWidth; ++w ) {
// add polygon indices
if( h < kHeight - 1 && w < kWidth - 1 ) {
size_t offset = positions.size();
indices.emplace_back( offset );
indices.emplace_back( offset + kWidth );
indices.emplace_back( offset + kWidth + 1 );
indices.emplace_back( offset );
indices.emplace_back( offset + kWidth + 1 );
indices.emplace_back( offset + 1 );
}
// add vertex
positions.emplace_back( vec3( float( w ), 0, float( h ) ) );
// add texture coordinates
// note: we only want to draw the lower part of the frequency bands,
// so we scale the coordinates a bit
const float part = 0.5f;
float s = w / float( kWidth - 1 );
float t = h / float( kHeight - 1 );
coords.emplace_back( vec2( part - part * s, t ) );
// add vertex colors
colors.emplace_back( Color( CM_HSV, s, 0.5f, 0.75f ) );
}
}
gl::VboMesh::Layout layout;
layout.usage( GL_STATIC_DRAW );
layout.attrib( geom::Attrib::POSITION, 3 );
layout.attrib( geom::Attrib::COLOR, 3 );
layout.attrib( geom::Attrib::TEX_COORD_0, 2 );
mMesh = gl::VboMesh::create( positions.size(), GL_TRIANGLES, { layout }, indices.size(), GL_UNSIGNED_INT );
mMesh->bufferAttrib( geom::POSITION, positions.size() * sizeof( vec3 ), positions.data() );
mMesh->bufferAttrib( geom::COLOR, colors.size() * sizeof( vec3 ), colors.data() );
mMesh->bufferAttrib( geom::TEX_COORD_0, coords.size() * sizeof( vec2 ), coords.data() );
mMesh->bufferIndices( indices.size() * sizeof( uint32_t ), indices.data() );
// play audio using the Cinder FMOD block
FMOD::System_Create( &mFMODSystem );
mFMODSystem->init( 32, FMOD_INIT_NORMAL | FMOD_INIT_ENABLE_PROFILE, NULL );
mFMODSound = nullptr;
mFMODChannel = nullptr;
playAudio( findAudio( mAudioPath ) );
mIsMouseDown = false;
mMouseUpDelay = 30.0;
mMouseUpTime = getElapsedSeconds() - mMouseUpDelay;
// the texture offset has two purposes:
// 1) it tells us where to upload the next spectrum data
// 2) we use it to offset the texture coordinates in the shader for the scrolling effect
mOffset = 0;
}
