func drawQuad(srcwidth, destwidth, srcheight, destheight float32) {
gl.Begin(gl.QUADS)
gl.TexCoord2i(0, 0)
gl.Vertex2f(-1, -1)
gl.TexCoord2i(int(srcwidth), 0)
gl.Vertex2f(-1+destwidth, -1)
gl.TexCoord2i(int(srcwidth), int(srcheight))
gl.Vertex2f(-1+destwidth, -1+destheight)
gl.TexCoord2i(0, int(srcheight))
gl.Vertex2f(-1, -1+destheight)
gl.End()
}
func (t *Texture) PreloadRender() {
t.Bind()
gl.Begin(gl.QUADS)
gl.TexCoord2f(0, 1)
gl.Vertex3f(0, 0, 1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(0, 0, 1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(0, 0, 1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(0, 0, 1)
gl.End()
}
func RenderAtlas(a Atlas) {
a.Bind()
xratio := float32(a.Width()) / float32(a.Height())
gl.Begin(gl.QUADS)
gl.TexCoord2f(0, 1)
gl.Vertex3f(-0.5, -0.5, 1)
gl.TexCoord2f(1, 1)
gl.Vertex3f((xratio)-0.5, -0.5, 1)
gl.TexCoord2f(1, 0)
gl.Vertex3f((xratio)-0.5, 0.5, 1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(-0.5, 0.5, 1)
gl.End()
}
func (t *Texture) Render() {
t.Bind()
xratio := float32(t.width) / float32(t.height)
gl.Begin(gl.QUADS)
gl.TexCoord2f(0, 1)
gl.Vertex3f(-0.5, -0.5, 1)
gl.TexCoord2f(1, 1)
gl.Vertex3f((xratio)-0.5, -0.5, 1)
gl.TexCoord2f(1, 0)
gl.Vertex3f((xratio)-0.5, 0.5, 1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(-0.5, 0.5, 1)
gl.End()
}