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 initShaders() {
program := Program(FragmentShader(fsh), VertexShader(vsh))
gl.UseProgram(program)
attrPos = uint(gl.GetAttribLocation(program, "pos"))
attrTexIn = uint(gl.GetAttribLocation(program, "texIn"))
unifTexture = gl.GetUniformLocation(program, "texture")
gl.EnableVertexAttribArray(attrPos)
gl.EnableVertexAttribArray(attrTexIn)
// Upload vertices data
gl.GenBuffers(1, gl.Void(&verticesArrayBuffer))
gl.BindBuffer(gl.ARRAY_BUFFER, verticesArrayBuffer)
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*4, gl.Void(&vertices[0]), gl.STATIC_DRAW)
// Upload texture data
imageBuffer, width, height := loadImage()
gl.GenTextures(1, gl.Void(&textureBuffer))
gl.BindTexture(gl.TEXTURE_2D, textureBuffer)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Void(&imageBuffer[0]))
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
}