Example #1
0
File: font.go Project: nsf/gotris
func uploadTexture_NRGBA32(img *image.NRGBA) gl.Texture {
	b := img.Bounds()
	data := make([]uint8, b.Max.X*b.Max.Y*4)
	for y := 0; y < b.Max.Y; y++ {
		for x := 0; x < b.Max.X; x++ {
			p := img.At(x, y)
			offset := y*b.Max.X*4 + x*4
			r, g, b, a := p.RGBA()
			data[offset+0] = uint8(r)
			data[offset+1] = uint8(g)
			data[offset+2] = uint8(b)
			data[offset+3] = uint8(a)
		}
	}

	id := gl.GenTexture()
	id.Bind(gl.TEXTURE_2D)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
	gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, b.Max.X, b.Max.Y, 0, gl.RGBA, gl.UNSIGNED_BYTE, data)

	if gl.GetError() != gl.NO_ERROR {
		id.Delete()
		panic(errors.New("Failed to load a texture"))
		return 0
	}
	return id
}
Example #2
0
File: gltoy.go Project: shogg/gltoy
func draw() {

	t := float32(sdl.GetTicks()) / 500.0
	time := prg.GetUniformLocation("time")
	time.Uniform1f(t)

	gl.Clear(gl.COLOR_BUFFER_BIT)

	gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
	if gl.GetError() != gl.NO_ERROR {
		panic("draw error")
	}
}
Example #3
0
func uploadTexture_RGBA32(w, h int, data []byte) gl.Texture {

	id := gl.GenTexture()
	id.Bind(gl.TEXTURE_2D)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
	gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int(w), int(h), 0, gl.RGBA, gl.UNSIGNED_BYTE, data)

	if gl.GetError() != gl.NO_ERROR {
		id.Delete()
		panic("Failed to load a texture")
		return 0
	}
	return id
}
Example #4
0
//----------------------------------------------------------------------------
func GlErrorString() string {
	code := gl.GetError()
	if code == 0 {
		return "NO GL ERROR"
	}
	index := uint32(code) - uint32(gl.INVALID_ENUM)
	errorStrings := []string{
		"GL_INVALID_ENUM",
		"GL_INVALID_VALUE",
		"GL_INVALID_OPERATION",
		"GL_STACK_OVERFLOW",
		"GL_STACK_UNDERFLOW",
		"GL_OUT_OF_MEMORY",
		"GL_UNKNOWN_ERROR_CODE"}
	if 0 <= index && index < 6 {
		return errorStrings[index]
	}
	return errorStrings[6]
}