gl.Uniform4f(color, 0, 0, blue, 1)
gl.Uniform2f(offset, float32(touchLoc.X/geom.Width), float32(touchLoc.Y/geom.Height))
gl.BindBuffer(gl.ARRAY_BUFFER, buf)
gl.EnableVertexAttribArray(position)
gl.VertexAttribPointer(position, coordsPerVertex, gl.FLOAT, false, 0, 0)
gl.DrawArrays(gl.TRIANGLES, 0, vertexCount)
gl.DisableVertexAttribArray(position)
debug.DrawFPS()
}
var triangleData = f32.Bytes(binary.LittleEndian,
0.0, 0.4, 0.0, // top left
0.0, 0.0, 0.0, // bottom left
0.4, 0.0, 0.0, // bottom right
)
const (
coordsPerVertex = 3
vertexCount = 3
)
const vertexShader = `#version 100
uniform vec2 offset;
attribute vec4 position;
void main() {
// offset comes in with x/y values between 0 and 1.
// position bounds are -1 to 1.
gl.EnableVertexAttribArray(glimage.pos) gl.VertexAttribPointer(glimage.pos, 2, gl.FLOAT, false, 0, 0) gl.BindBuffer(gl.ARRAY_BUFFER, glimage.quadUV) gl.EnableVertexAttribArray(glimage.inUV) gl.VertexAttribPointer(glimage.inUV, 2, gl.FLOAT, false, 0, 0) gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4) gl.DisableVertexAttribArray(glimage.pos) gl.DisableVertexAttribArray(glimage.inUV) } var quadXYCoords = f32.Bytes(binary.LittleEndian, -1, +1, // top left +1, +1, // top right -1, -1, // bottom left +1, -1, // bottom right ) var quadUVCoords = f32.Bytes(binary.LittleEndian, 0, 0, // top left 1, 0, // top right 0, 1, // bottom left 1, 1, // bottom right ) const vertexShader = `#version 100 uniform mat3 mvp; uniform mat3 uvp; attribute vec3 pos; attribute vec2 inUV;
func drawKeys() {
gl.UseProgram(program)
projection.WriteMat4(&projmat)
iPlaying := []int{}
playing := []ratio{}
amps := []float64{}
for i, k := range keys {
k := k.base()
if k.voice != nil && !k.voice.Done() {
iPlaying = append(iPlaying, i)
playing = append(playing, k.ratio)
amps = append(amps, k.voice.amp())
}
}
complexities := make([]float64, len(keys))
minComplexity := math.MaxFloat64
for i, k := range keys {
k := k.base()
c := -1.0
for j, iPlaying := range iPlaying {
if i == iPlaying {
a := amps[j]
amps[j] = 1
c = complexity(playing, amps)
amps[j] = a
break
}
}
if c == -1 {
c = complexity(append(playing, k.ratio), append(amps, 1))
}
complexities[i] = c
if c < minComplexity {
minComplexity = c
}
}
data := []float32{}
pointsizedata := []float32{}
for i, k := range keys {
k := k.base()
k.y = 1 - math.Exp2(-float64(complexities[i]-minComplexity)/4)
k.size = math.Exp2(-float64(complexities[i])/4) * float64(geom.Width) * float64(geom.PixelsPerPt) / 4
data = append(data, float32(k.pitch), float32(k.y))
pointsizedata = append(pointsizedata, float32(k.size))
}
gl.BindBuffer(gl.ARRAY_BUFFER, positionbuf)
gl.BufferData(gl.ARRAY_BUFFER, f32.Bytes(binary.LittleEndian, data...), gl.DYNAMIC_DRAW)
gl.BindBuffer(gl.ARRAY_BUFFER, pointsizebuf)
gl.BufferData(gl.ARRAY_BUFFER, f32.Bytes(binary.LittleEndian, pointsizedata...), gl.DYNAMIC_DRAW)
gl.EnableVertexAttribArray(position)
gl.EnableVertexAttribArray(pointsize)
gl.Uniform4f(color, 1, 1, 1, 1)
gl.BindBuffer(gl.ARRAY_BUFFER, positionbuf)
gl.VertexAttribPointer(position, 2, gl.FLOAT, false, 0, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, pointsizebuf)
gl.VertexAttribPointer(pointsize, 1, gl.FLOAT, false, 0, 0)
gl.DrawArrays(gl.POINTS, 0, len(keys))
gl.DisableVertexAttribArray(position)
gl.DisableVertexAttribArray(pointsize)
}