Method RenderSetup

texture/texture2D.go:342–408

RenderSetup is called by the material render setup

(gs *gls.GLS, slotIdx, uniIdx int)

// RenderSetup is called by the material render setup
func (t *Texture2D) RenderSetup(gs *gls.GLS, slotIdx, uniIdx int) { // Could have as input - TEXTURE0 (slot) and uni location

	// One time initialization
	if t.gs == nil {
		t.texname = gs.GenTexture()
		t.gs = gs
	}

	// Sets the texture unit for this texture
	gs.ActiveTexture(uint32(gls.TEXTURE0 + slotIdx))
	gs.BindTexture(gls.TEXTURE_2D, t.texname)

	// Transfer texture data to OpenGL if necessary
	if t.updateData {
		if t.compressed {
			gs.CompressedTexImage2D(
				gls.TEXTURE_2D,
				0,
				uint32(t.iformat),
				t.width,
				t.height,
				t.size,
				t.data,
			)
		} else {
			gs.TexImage2D(
				gls.TEXTURE_2D, // texture type
				0,              // level of detail
				t.iformat,      // internal format
				t.width,        // width in texels
				t.height,       // height in texels
				t.format,       // format of supplied texture data
				t.formatType,   // type of external format color component
				t.data,         // image data
			)
		}
		// Generates mipmaps if requested
		if t.genMipmap {
			gs.GenerateMipmap(gls.TEXTURE_2D)
		}
		// No data to send
		t.updateData = false
	}

	// Sets texture parameters if needed
	if t.updateParams {
		gs.TexParameteri(gls.TEXTURE_2D, gls.TEXTURE_MAG_FILTER, int32(t.magFilter))
		gs.TexParameteri(gls.TEXTURE_2D, gls.TEXTURE_MIN_FILTER, int32(t.minFilter))
		gs.TexParameteri(gls.TEXTURE_2D, gls.TEXTURE_WRAP_S, int32(t.wrapS))
		gs.TexParameteri(gls.TEXTURE_2D, gls.TEXTURE_WRAP_T, int32(t.wrapT))
		t.updateParams = false
	}

	// Transfer texture unit uniform
	var location int32
	if uniIdx == 0 {
		location = t.uniUnit.Location(gs)
	} else {