Golang Context.UseProgram方法代码示例

func onStart(glctx gl.Context, sz size.Event) {
	log.Printf("creating GL program")
	var err error
	keystate = map[touch.Sequence]int{}
	program, err = glutil.CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		log.Printf("error creating GL program: %v", err)
		return
	}

	glctx.Enable(gl.DEPTH_TEST)

	position = glctx.GetAttribLocation(program, "position")
	texCordIn = glctx.GetAttribLocation(program, "texCordIn")
	color = glctx.GetUniformLocation(program, "color")
	drawi = glctx.GetUniformLocation(program, "drawi")
	projection = glctx.GetUniformLocation(program, "projection")
	camera = glctx.GetUniformLocation(program, "camera")

	loadTexture(glctx)
	glctx.UseProgram(program)

	projectionMat := mgl32.Perspective(mgl32.DegToRad(75.0), float32(1), 0.5, 40.0)
	glctx.UniformMatrix4fv(projection, projectionMat[:])

	cameraMat := mgl32.LookAtV(mgl32.Vec3{0.5, 0, 1.5}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
	glctx.UniformMatrix4fv(camera, cameraMat[:])

	board = NewBoard(glctx, float32(0.05), 10)

	numKeys := len(board.bigKeys) + len(board.smallKeys)

	InitializeSound(numKeys)
}

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)
}

func onPaint(glctx gl.Context, sz size.Event) {
	glctx.ClearColor(0.2, 0.2, 0.2, 0.5)
	glctx.Clear(gl.DEPTH_BUFFER_BIT)
	glctx.Clear(gl.COLOR_BUFFER_BIT)

	glctx.UseProgram(program)

	board.Draw()
}

func onTouch(glctx gl.Context, e touch.Event) {
	touchX = e.X
	touchY = e.Y

	// When touch occurs we need to figure out which key is pressed.
	// Using color picking for this.
	// That is, scene is redrawn with each key given a unique color.
	// And then the color is read on the touched pixel to figure out which key
	// is pressed or if a key is pressed at all.

	glctx.ClearColor(0.73, 0.5, 0.75, 0.5)
	glctx.Clear(gl.DEPTH_BUFFER_BIT)
	glctx.Clear(gl.COLOR_BUFFER_BIT)
	glctx.UseProgram(program)

	board.DrawI() // Draw the board with each key in a unique color

	c := make([]byte, 12, 12)

	glctx.ReadPixels(c, int(e.X), int(e.Y), 1, 1, gl.RGB, gl.UNSIGNED_BYTE)
	// gl.RGB, gl.UNSIGNED_BYTE is the combination that is preffered by my Android
	// phone. And is said to be the one preffered by many.

	r := (float32(c[0]) / 255) * 100                 // Convert byte to float
	out := float32(math.Floor(float64(r)+0.5)) / 100 // and round up
	key, ok := board.idColorKey[out]

	if !ok {
		curKey, ok := keystate[e.Sequence] //stop already playing sound
		if ok {
			StopSound(curKey)
		}
		return
	}

	if e.Type == touch.TypeBegin {
		keystate[e.Sequence] = key
		PlaySound(key)
	} else if e.Type == touch.TypeEnd {
		delete(keystate, e.Sequence)
		StopSound(key)
	} else if e.Type == touch.TypeMove {
		if keystate[e.Sequence] != key {
			// Drag has moved out of initial key
			curKey, ok := keystate[e.Sequence] //stop already playing sound
			if ok {
				StopSound(curKey)
			}
			PlaySound(key) // play new key's sound
			keystate[e.Sequence] = key
		}
	}
}

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)
}

func onPaint(glctx gl.Context, sz size.Event) {
	glctx.ClearColor(0.5, 0.5, 0.5, 1)
	glctx.Clear(gl.COLOR_BUFFER_BIT)

	glctx.UseProgram(frameData.Program)

	glctx.Uniform4f(frameData.Color, 0.5, 0.5, 0.5, 1)

	// Put ourselves in the +x/+y quadrant (upper right quadrant)
	glctx.Uniform2f(frameData.Offset, 0.0, 1.0)

	glctx.EnableVertexAttribArray(frameData.Position)
	manager.PaintLayers(sz, frameData)
	// End drawing
	glctx.DisableVertexAttribArray(frameData.Position)

}

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)
}

// 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 (prg Program) Use(ctx gl.Context, options ...func(gl.Context, Program)) {
	ctx.UseProgram(prg.Program)
	for _, opt := range options {
		opt(ctx, prg)
	}
}