示例#1
0
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)
}