func drawTexRect(tex *texture.Texture, a, b *Vec2) {
tex.Bind()
gl.Begin(gl.QUADS)
gl.TexCoord2i(0, 0)
a.Gl()
gl.TexCoord2i(1, 0)
V2(b.X, a.Y).Gl()
gl.TexCoord2i(1, 1)
b.Gl()
gl.TexCoord2i(0, 1)
V2(a.X, b.Y).Gl()
gl.End()
}
// Draw draws the given image to the open window.
func (img Image) Draw(x, y int) {
img.tex.Bind(gl.TEXTURE_2D)
gl.Begin(gl.QUADS)
gl.TexCoord2i(0, 0)
gl.Vertex3i(x, y, 0)
gl.TexCoord2i(1, 0)
gl.Vertex3i(x+img.Width, y, 0)
gl.TexCoord2i(1, 1)
gl.Vertex3i(x+img.Width, y+img.Height, 0)
gl.TexCoord2i(0, 1)
gl.Vertex3i(x, y+img.Height, 0)
gl.End()
img.tex.Unbind(gl.TEXTURE_2D)
}
func (t *Skybox) RenderScaled(center, scale *Vec3) {
v := []*Vec3{
V3(-1, -1, 1),
V3(1, -1, 1),
V3(1, 1, 1),
V3(-1, 1, 1),
V3(-1, -1, -1),
V3(1, -1, -1),
V3(1, 1, -1),
V3(-1, 1, -1)}
for i := 0; i < 8; i++ {
v[i].Muli(scale).Addi(center)
}
if globals.UseShader {
program.Unuse()
}
//*//save attributes and change them
gl.PushAttrib(gl.ENABLE_BIT | gl.TEXTURE_BIT)
defer gl.PopAttrib() //reset to old attributes
gl.Enable(gl.TEXTURE_2D)
gl.Disable(gl.DEPTH_TEST)
gl.Disable(gl.LIGHTING)
gl.Disable(gl.BLEND) //*/
oneSide := func(tex *texture.Texture, a, b, c, d int, n *Vec3) {
tex.BindForSkybox(color.White)
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.Begin(gl.TRIANGLES)
gl.Normal3dv(n.Slc())
gl.TexCoord2i(0, 0)
gl.Vertex3dv(v[a].Slc())
gl.TexCoord2i(1, 0)
gl.Vertex3dv(v[b].Slc())
gl.TexCoord2i(1, 1)
gl.Vertex3dv(v[c].Slc())
gl.TexCoord2i(0, 0)
gl.Vertex3dv(v[a].Slc())
gl.TexCoord2i(1, 1)
gl.Vertex3dv(v[c].Slc())
gl.TexCoord2i(0, 1)
gl.Vertex3dv(v[d].Slc())
gl.End()
}
oneSide(t.up, 2, 3, 7, 6, V3(0, -1, 0))
oneSide(t.dn, 5, 4, 0, 1, V3(0, 1, 0))
oneSide(t.lt, 5, 1, 2, 6, V3(1, 0, 0))
oneSide(t.rt, 0, 4, 7, 3, V3(-1, 0, 0))
oneSide(t.ft, 1, 0, 3, 2, V3(0, 0, -1))
oneSide(t.bk, 4, 5, 6, 7, V3(0, 0, 1))
}