// Implements Renderer interface.
func (gc *opengl) BindTexture(texture *data.Texture) (err error) {
if texture == nil {
return
}
if glerr := gl.GetError(); glerr != gl.NO_ERROR {
log.Printf("opengl:bindTexture need to find and fix prior error %X", glerr)
}
gl.GenTextures(1, &(texture.Tid))
gl.BindTexture(gl.TEXTURE_2D, texture.Tid)
// ensure image is in RGBA format
b := texture.Img.Bounds()
rgba := image.NewRGBA(image.Rect(0, 0, b.Dx(), b.Dy()))
draw.Draw(rgba, rgba.Bounds(), texture.Img, b.Min, draw.Src)
width, height := int32(b.Dx()), int32(b.Dy())
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&(rgba.Pix[0])))
gl.GenerateMipmap(gl.TEXTURE_2D)
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_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
if glerr := gl.GetError(); glerr != gl.NO_ERROR {
err = fmt.Errorf("Failed binding texture %s\n", texture.Name)
}
return
}
// drawScene renders the scene consisting of one VAO.
func (tb *tbtag) drawScene() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(tb.shaders)
gl.Uniform1i(tb.sampler, 0)
gl.ActiveTexture(gl.TEXTURE0 + 0)
gl.BindTexture(gl.TEXTURE_2D, tb.texture.Tid)
gl.BindVertexArray(tb.vao)
tb.mvp32 = renderMatrix(tb.ortho, tb.mvp32)
gl.UniformMatrix4fv(tb.mvpref, 1, false, tb.mvp32.Pointer())
gl.DrawElements(gl.TRIANGLES, int32(len(tb.faces)), gl.UNSIGNED_BYTE, gl.Pointer(nil))
// cleanup
gl.ActiveTexture(0)
gl.UseProgram(0)
gl.BindVertexArray(0)
}
// Implements Renderer interface.
func (gc *opengl) MapTexture(tid int, t *data.Texture) {
tmap := map[int]uint32{
0: gl.TEXTURE0,
1: gl.TEXTURE1,
2: gl.TEXTURE2,
3: gl.TEXTURE3,
4: gl.TEXTURE4,
5: gl.TEXTURE5,
6: gl.TEXTURE6,
7: gl.TEXTURE7,
8: gl.TEXTURE8,
9: gl.TEXTURE9,
}
gl.ActiveTexture(tmap[tid])
gl.BindTexture(gl.TEXTURE_2D, t.Tid)
}
// initTexture loads the texture and binds it to the graphics device.
func (tb *tbtag) initTexture() {
texture := &data.Texture{}
loader := data.NewLoader()
if loader.Load("image", &texture); texture != nil {
tb.texture = texture
gl.GenTextures(1, &texture.Tid)
gl.BindTexture(gl.TEXTURE_2D, texture.Tid)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
// ensure image is in RGBA format
b := texture.Img.Bounds()
rgba := image.NewRGBA(image.Rect(0, 0, b.Dx(), b.Dy()))
draw.Draw(rgba, rgba.Bounds(), texture.Img, b.Min, draw.Src)
width, height := int32(b.Dx()), int32(b.Dy())
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&(rgba.Pix[0])))
if glerr := gl.GetError(); glerr != gl.NO_ERROR {
fmt.Printf("Failed binding texture image.png\n")
}
} else {
fmt.Println("Could not load image.png file.")
}
}