func initScene() {
halfW, halfH := float32(Width)*0.5, float32(Height)*0.5
Projection = mgl.Ortho2D(-halfW, halfW, -halfH, halfH).Mul4(
mgl.Translate3D(-halfW, -halfH, 0))
ModelView = mgl.Ident4f().Mul4(mgl.Scale3D(100, 100, 0))
MVP <- Projection.Mul4(ModelView)
gl.Disable(gl.DEPTH_TEST)
gl.DepthMask(false)
program := Program(FragmentShader(fsh), VertexShader(vsh))
gl.UseProgram(uint(program))
uMVP = gl.GetUniformLocation(program, "uMVP")
attrPos = gl.GetAttribLocation(program, "pos")
attrColor = gl.GetAttribLocation(program, "color")
gl.EnableVertexAttribArray(uint(attrPos))
gl.EnableVertexAttribArray(uint(attrColor))
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.VertexAttribPointer(uint(attrPos), 2, gl.FLOAT, false, 0, uintptr(gl.Void(&POSITION[0])))
gl.VertexAttribPointer(uint(attrColor), 4, gl.FLOAT, false, 0, uintptr(gl.Void(&COLOR[0])))
}
func draw(width, height int) {
gl.Viewport(0, 0, width, height)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.BindBuffer(gl.ARRAY_BUFFER, verticesArrayBuffer)
gl.VertexAttribPointer(attrPos, 4, gl.FLOAT, false, 0, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, colorsArrayBuffer)
gl.VertexAttribPointer(attrColor, 4, gl.FLOAT, false, 0, 0)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
gl.Flush()
gl.Finish()
}
func draw(width, height int) {
gl.Viewport(0, 0, width, height)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.BindBuffer(gl.ARRAY_BUFFER, verticesArrayBuffer)
gl.VertexAttribPointer(attrPos, 4, gl.FLOAT, false, 6*4, 0)
// bind texture - FIX size of vertex
gl.VertexAttribPointer(attrTexIn, 2, gl.FLOAT, false, 6*4, 4*4)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, textureBuffer)
gl.Uniform1i(unifTexture, 0)
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
gl.Flush()
gl.Finish()
}