func glInit() {
var err error
glimage.program, err = CreateProgram(vertexShader, fragmentShader)
if err != nil {
panic(err)
}
glimage.quadXY = gl.GenBuffer()
glimage.quadUV = gl.GenBuffer()
gl.BindBuffer(gl.ARRAY_BUFFER, glimage.quadXY)
gl.BufferData(gl.ARRAY_BUFFER, gl.STATIC_DRAW, quadXYCoords)
gl.BindBuffer(gl.ARRAY_BUFFER, glimage.quadUV)
gl.BufferData(gl.ARRAY_BUFFER, gl.STATIC_DRAW, quadUVCoords)
glimage.pos = gl.GetAttribLocation(glimage.program, "pos")
glimage.mvp = gl.GetUniformLocation(glimage.program, "mvp")
glimage.uvp = gl.GetUniformLocation(glimage.program, "uvp")
glimage.inUV = gl.GetAttribLocation(glimage.program, "inUV")
glimage.textureSample = gl.GetUniformLocation(glimage.program, "textureSample")
}
func initGL() {
var err error
program, err = glutil.CreateProgram(vertexShader, fragmentShader)
if err != nil {
log.Printf("error creating GL program: %v", err)
return
}
buf = gl.GenBuffer()
gl.BindBuffer(gl.ARRAY_BUFFER, buf)
gl.BufferData(gl.ARRAY_BUFFER, gl.STATIC_DRAW, triangleData)
position = gl.GetAttribLocation(program, "position")
color = gl.GetUniformLocation(program, "color")
offset = gl.GetUniformLocation(program, "offset")
touchLoc = geom.Point{geom.Width / 2, geom.Height / 2}
}