func setupAttrib(location gl33.Uint, type_ gl33.Enum, dimensions int, offset uintptr, vertexSize int) {
gl33.EnableVertexAttribArray(location)
if type_ == gl33.FLOAT || type_ == gl33.DOUBLE {
gl33.VertexAttribPointer(location, gl33.Int(dimensions), type_, gl33.FALSE, gl33.Sizei(vertexSize), gl33.Pointer(offset))
} else {
gl33.VertexAttribIPointer(location, gl33.Int(dimensions), type_, gl33.Sizei(vertexSize), gl33.Pointer(offset))
}
}
func (p *Program) Link() error {
linkOk := gl.Int(gl.FALSE)
gl.LinkProgram(p.id)
gl.GetProgramiv(p.id, gl.LINK_STATUS, &linkOk)
if linkOk == gl.FALSE {
return p.getError()
}
return nil
}
func (s *Shader) Compile() error {
compileOk := gl.Int(gl.FALSE)
gl.CompileShader(s.id)
gl.GetShaderiv(s.id, gl.COMPILE_STATUS, &compileOk)
if compileOk == gl.FALSE {
return s.getError()
}
return nil
}
func drawgl() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
uniYaw = yrot * (math.Pi / 180.0)
yrot = yrot - 1.0
uniPitch = zrot * (math.Pi / 180.0)
zrot = zrot - 0.5
uniRoll = xrot * (math.Pi / 180.0)
xrot = xrot - 0.2
gl.Uniform4f(UniScale, gl.Float(uniRoll), gl.Float(uniYaw), gl.Float(uniPitch), gl.Float(uniscale))
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.DrawArrays(gl.TRIANGLES, gl.Int(0), gl.Sizei(len(triangle_vertices)*4))
time.Sleep(50 * time.Millisecond)
}
func LoadShader(data string, shaderType ShaderType) (*Shader, error) {
var id gl.Uint
switch shaderType {
case VertexShader:
id = gl.CreateShader(gl.VERTEX_SHADER)
case FragmentShader:
id = gl.CreateShader(gl.FRAGMENT_SHADER)
default:
return nil, ErrUnknownShader
}
shader := &Shader{id: id}
src := gl.GLStringArray(data)
length := gl.Int(-1)
gl.ShaderSource(shader.id, gl.Sizei(1), &src[0], &length)
gl.GLStringArrayFree(src)
return shader, nil
}
func (vbo *VertexBufferObject) DrawArrays(start, end int) {
gl.DrawArrays(gl.TRIANGLES, gl.Int(start), gl.Sizei(end))
}
func (tex *Texture) SetFilters(minFilter int, magFilter int) {
tex.Bind(0)
gl33.TexParameteri(tex.Type, gl33.TEXTURE_MIN_FILTER, gl33.Int(minFilter))
gl33.TexParameteri(tex.Type, gl33.TEXTURE_MAG_FILTER, gl33.Int(magFilter))
}
func (loc *UniformLocation) Uniform1i(value int) {
gl.Uniform1i(loc.id, gl.Int(value))
}
func (shader *Shader) Source(source string) {
str := gl33.GLString(source)
defer gl33.GLStringFree(str)
length := gl33.Int(len(source))
gl33.ShaderSource(shader.Id, 1, &str, &length)
}
func SetViewport(left, top, right, bottom int) {
gl.Viewport(gl.Int(left), gl.Int(top), gl.Sizei(right), gl.Sizei(bottom))
}
func (loc *AttributeLocation) AttribPointerFloat(size int, normalized bool, stride int, pointer gl.Pointer) {
gl.VertexAttribPointer(loc.id, gl.Int(size), gl.FLOAT, gl.GLBool(normalized), gl.Sizei(stride), pointer)
}