func onPaint(glctx gl.Context, sz size.Event) {
//gl.Enable(gl.DEPTH_TEST)
//gl.DepthFunc(gl.LESS)
//清场
glctx.ClearColor(1, 1, 1, 1) //设置背景颜色
glctx.Clear(gl.COLOR_BUFFER_BIT)
glctx.Clear(gl.DEPTH_BUFFER_BIT)
//使用program
glctx.UseProgram(program)
//gl.Uniform4f(color, 0, 0.5, 0.8, 1)//设置color对象值,设置4个浮点数.
//offset有两个值X,Y,窗口左上角为(0,0),右下角为(1,1)
//gl.Uniform4f(offset,5.0,1.0,1.0,1.0 )
//gl.Uniform2f(offset,offsetx,offsety )//为2参数的uniform变量赋值
//log.Println("offset:",offsetx,offsety, 0, 0)
glctx.UniformMatrix4fv(scan, []float32{
touchLocX/float32(sz.WidthPt)*4 - 2, 0, 0, 0,
0, touchLocY/float32(sz.HeightPt)*4 - 2, 0, 0,
0, 0, 0, 0,
0, 0, 0, 1,
})
/*glVertexAttribPointer 指定了渲染时索引值为 index 的顶点属性数组的数据格式和位置。调用gl.vertexAttribPointer()方法，
把顶点着色器中某个属性相对应的通用属性索引连接到绑定的webGLBUffer对象上。
index 指定要修改的顶点属性的索引值
size 指定每个顶点属性的组件数量。必须为1、2、3或者4。初始值为4。（如position是由3个（x,y,z）组成，而颜色是4个（r,g,b,a））
type 指定数组中每个组件的数据类型。可用的符号常量有GL_BYTE, GL_UNSIGNED_BYTE, GL_SHORT,GL_UNSIGNED_SHORT, GL_FIXED,
和 GL_FLOAT，初始值为GL_FLOAT。
normalized 指定当被访问时，固定点数据值是否应该被归一化（GL_TRUE）或者直接转换为固定点值（GL_FALSE）。
stride 指定连续顶点属性之间的偏移量。如果为0，那么顶点属性会被理解为：它们是紧密排列在一起的。初始值为0。
pointer 指定第一个组件在数组的第一个顶点属性中的偏移量。该数组与GL_ARRAY_BUFFER绑定，储存于缓冲区中。初始值为0；
*/
glctx.BindBuffer(gl.ARRAY_BUFFER, positionbuf)
glctx.EnableVertexAttribArray(position)
defer glctx.DisableVertexAttribArray(position)//必须全部缓存导入完成后再关闭
glctx.VertexAttribPointer(position, coordsPerVertex, gl.FLOAT, false, 0, 0) //导入position缓存
glctx.DrawArrays(gl.TRIANGLES, 0, vertexCount)
glctx.BindBuffer(gl.ARRAY_BUFFER, colorbuf)
glctx.EnableVertexAttribArray(color)
defer glctx.DisableVertexAttribArray(color)//必须全部缓存导入完成后再关闭
glctx.VertexAttribPointer(color, colorsPerVertex, gl.FLOAT, false, 0, 0) //导入color缓存
glctx.DrawArrays(gl.TRIANGLES, 0, vertexCount)
fps.Draw(sz)
}
// PaintKey will paint the key 1) its own color or 2) red if they key is pressed.
func (k *PianoKey) PaintKey(glctx gl.Context, frameData util.FrameData) {
glctx.BindBuffer(gl.ARRAY_BUFFER, k.glBuf)
glctx.VertexAttribPointer(frameData.Position, coordsPerVertex, gl.FLOAT, false, 0, 0)
if k.pressed {
// Paint Red if pressed
glctx.Uniform4f(frameData.Color, 1, 0, 0, 1)
} else {
// Paint white if not pressed
glctx.Uniform4f(frameData.Color, k.keyColor.Red, k.keyColor.Green, k.keyColor.Blue, 1)
}
if frameData.Orientation == util.Portrait {
glctx.DrawArrays(gl.TRIANGLES, 6, vertexCount)
} else if frameData.Orientation == util.Landscape {
glctx.DrawArrays(gl.TRIANGLES, 0, vertexCount)
}
}
func onPaint(glctx gl.Context, sz size.Event) {
glctx.ClearColor(1, 0, 0, 1)
glctx.Clear(gl.COLOR_BUFFER_BIT)
glctx.UseProgram(program)
green += 0.01
if green > 1 {
green = 0
}
glctx.Uniform4f(color, 0, green, 0, 1)
glctx.Uniform2f(offset, touchX/float32(sz.WidthPx), touchY/float32(sz.HeightPx))
glctx.BindBuffer(gl.ARRAY_BUFFER, buf)
glctx.EnableVertexAttribArray(position)
glctx.VertexAttribPointer(position, coordsPerVertex, gl.FLOAT, false, 0, 0)
glctx.DrawArrays(gl.TRIANGLES, 0, vertexCount)
glctx.DisableVertexAttribArray(position)
fps.Draw(sz)
}
func (wf *Waveform) Paint(ctx gl.Context, xps, yps, width, height float32) {
// TODO this is racey and samples can be in the middle of changing
// move the slice copy to Prepare and sync with playback, or feed over chan
// TODO assumes mono
var (
xstep float32 = width / float32(len(wf.samples))
xpos float32 = xps
)
for i, x := range wf.samples {
// clip
if x > 1 {
x = 1
} else if x < -1 {
x = -1
}
wf.verts[i*3] = float32(xpos)
wf.verts[i*3+1] = yps + (height * float32((x+1)/2))
wf.verts[i*3+2] = 0
xpos += xstep
}
for i, x := range wf.verts {
u := math.Float32bits(x)
wf.data[4*i+0] = byte(u >> 0)
wf.data[4*i+1] = byte(u >> 8)
wf.data[4*i+2] = byte(u >> 16)
wf.data[4*i+3] = byte(u >> 24)
}
ctx.UseProgram(wf.program)
ctx.Uniform4f(wf.color, 1, 1, 1, 1)
// update hw buf and draw
ctx.BindBuffer(gl.ARRAY_BUFFER, wf.buf)
ctx.EnableVertexAttribArray(wf.position)
ctx.VertexAttribPointer(wf.position, 3, gl.FLOAT, false, 0, 0)
ctx.BufferSubData(gl.ARRAY_BUFFER, 0, wf.data)
ctx.DrawArrays(gl.LINE_STRIP, 0, len(wf.samples))
ctx.DisableVertexAttribArray(wf.position)
}
func onPaint(glctx gl.Context, sz size.Event) {
glctx.Viewport(0, 0, sz.WidthPx, sz.HeightPx)
glctx.ClearColor(0.5, 0.5, 0.5, 1)
glctx.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
glctx.UseProgram(program)
projectionMtx = mgl32.Perspective(45, float32(width)/float32(height), 0.1, 100)
arcBallMtx := arcball.getMtx()
glctx.UniformMatrix4fv(projection, projectionMtx[:])
glctx.UniformMatrix4fv(view, arcBallMtx[:])
glctx.BindBuffer(gl.ARRAY_BUFFER, triBuf)
glctx.EnableVertexAttribArray(position)
glctx.EnableVertexAttribArray(color)
glctx.EnableVertexAttribArray(normals)
vertSize := 4 * (coordsPerVertex + colorPerVertex + normalsPerVertex)
glctx.VertexAttribPointer(position, coordsPerVertex, gl.FLOAT, false, vertSize, 0)
glctx.VertexAttribPointer(color, colorPerVertex, gl.FLOAT, false, vertSize, 4*coordsPerVertex)
glctx.VertexAttribPointer(normals, normalsPerVertex, gl.FLOAT, false, vertSize, 4*(coordsPerVertex+colorPerVertex))
glctx.DepthMask(true)
glctx.Uniform3fv(lightPos, light.Pos[:])
glctx.Uniform3fv(lightIntensity, light.Intensities[:])
for _, k := range piano.Keys {
glctx.Uniform4fv(tint, k.Color[:])
mtx := k.GetMtx()
normMat := mtx.Mat3().Inv().Transpose()
glctx.UniformMatrix3fv(normalMatrix, normMat[:])
glctx.UniformMatrix4fv(model, mtx[:])
glctx.DrawArrays(gl.TRIANGLES, 0, len(triangleData)/vertSize)
}
modelMtx := mgl32.Ident4()
modelMtx = modelMtx.Mul4(mgl32.Translate3D(worldPos.X(), worldPos.Y(), worldPos.Z()))
modelMtx = modelMtx.Mul4(mgl32.Scale3D(0.5, 0.5, 0.5))
/*
glctx.Uniform4fv(tint, red[:])
// Disable depthmask so we dont get the pixel depth of the cursor cube
glctx.DepthMask(false)
glctx.UniformMatrix4fv(model, modelMtx[:])
glctx.DepthMask(true)
*/
glctx.DisableVertexAttribArray(position)
glctx.DisableVertexAttribArray(color)
glctx.DisableVertexAttribArray(normals)
fps.Draw(sz)
}
// This is the main rendering call that updates the current scene and all children in the scene
func appPaint(glctx gl.Context, sz size.Event, delta float32) {
glctx.ClearColor(currentScene.BGColor.R, currentScene.BGColor.G, currentScene.BGColor.B, currentScene.BGColor.A)
glctx.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
for _, child := range currentScene.Children {
child.act(delta)
child.draw(tempBatch, 1.0)
if len(InputChannel) > 0 {
for e := range InputChannel {
if child.Input != nil {
child.Input(child, e)
}
if len(InputChannel) == 0 {
break
}
}
}
}
glctx.UseProgram(program)
green += 0.01
if green > 1 {
green = 0
}
glctx.Uniform4f(color, 0, green, 0, 1)
glctx.Uniform2f(offset, touchX/float32(sz.WidthPx), touchY/float32(sz.HeightPx))
glctx.BindBuffer(gl.ARRAY_BUFFER, buf)
glctx.EnableVertexAttribArray(position)
glctx.VertexAttribPointer(position, coordsPerVertex, gl.FLOAT, false, 0, 0)
glctx.DrawArrays(gl.TRIANGLES, 0, vertexCount)
glctx.DisableVertexAttribArray(position)
fps.Draw(sz)
}
func (btn *Button) Paint(ctx gl.Context) {
for i, x := range btn.verts {
u := math.Float32bits(x)
btn.data[4*i+0] = byte(u >> 0)
btn.data[4*i+1] = byte(u >> 8)
btn.data[4*i+2] = byte(u >> 16)
btn.data[4*i+3] = byte(u >> 24)
}
ctx.UseProgram(btn.program)
if btn.active {
ctx.Uniform4f(btn.color, btn.r, btn.g, btn.b, btn.a)
} else {
ctx.Uniform4f(btn.color, 0.4, 0.4, 0.4, 0.5)
}
// update hw buf and draw
ctx.BindBuffer(gl.ARRAY_BUFFER, btn.buf)
ctx.EnableVertexAttribArray(btn.position)
ctx.VertexAttribPointer(btn.position, 3, gl.FLOAT, false, 0, 0)
ctx.BufferSubData(gl.ARRAY_BUFFER, 0, btn.data)
ctx.DrawArrays(gl.TRIANGLES, 0, len(btn.verts))
ctx.DisableVertexAttribArray(btn.position)
}
// TODO an Attrib type that describes it's format would be useful here
func (prg Program) Pointer(ctx gl.Context, a gl.Attrib, size int) {
ctx.EnableVertexAttribArray(a)
ctx.VertexAttribPointer(a, size, gl.FLOAT, false, 0, 0)
}