func (a *app) draw(t time.Time) {
gl.Clear(gl.COLOR_BUFFER_BIT)
img := a.img
w := img.Rect.Dx()
h := img.Rect.Dy()
gl.ActiveTexture(gl.TEXTURE0)
upload(1, img.Y, img.YStride, w, h)
gl.ActiveTexture(gl.TEXTURE1)
upload(2, img.Cb, img.CStride, w/2, h/2)
gl.ActiveTexture(gl.TEXTURE2)
upload(3, img.Cr, img.CStride, w/2, h/2)
if *blend {
pimg := a.pimg
gl.Uniform1f(a.factorloc, factor(t,
a.tbase.Add(pimg.Timecode),
a.tbase.Add(img.Timecode)))
gl.ActiveTexture(gl.TEXTURE3)
upload(4, pimg.Y, pimg.YStride, w, h)
gl.ActiveTexture(gl.TEXTURE4)
upload(5, pimg.Cb, pimg.CStride, w/2, h/2)
gl.ActiveTexture(gl.TEXTURE5)
upload(6, pimg.Cr, pimg.CStride, w/2, h/2)
}
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
}
// Draw draws the Sprite object.
func (sprite *Sprite) Draw(frame int) error {
gl.BindBuffer(gl.ARRAY_BUFFER, sprite.shape.vertexBuffer)
gl.VertexAttribPointer(gl.Uint(0), 2, gl.FLOAT, gl.FALSE, 0, gl.Offset(nil, 0))
gl.BindAttribLocation(paunchEffect.program, gl.Uint(0), gl.GLString("position"))
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
if sprite.texcoordBuffer != 0 {
gl.ActiveTexture(gl.TEXTURE0)
gl.BindBuffer(gl.ARRAY_BUFFER, sprite.texcoordBuffer)
gl.VertexAttribPointer(gl.Uint(1), 2, gl.FLOAT, gl.FALSE, 0, gl.Offset(nil, 0))
gl.BindAttribLocation(paunchEffect.program, gl.Uint(0), gl.GLString("texcoord"))
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BindTexture(gl.TEXTURE_2D, sprite.texture[frame])
gl.EnableVertexAttribArray(gl.Uint(1))
}
gl.EnableVertexAttribArray(gl.Uint(0))
gl.DrawArrays(gl.TRIANGLES, 0, gl.Sizei(sprite.shape.size))
gl.DisableVertexAttribArray(gl.Uint(0))
gl.DisableVertexAttribArray(gl.Uint(1))
gl.BindTexture(gl.TEXTURE_2D, 0)
return checkForErrors()
}
func renderPts() {
gl.MatrixMode(gl.MODELVIEW)
for i := minPt; i <= maxPt; i++ {
if Pts[i].is == false {
continue
}
pt := &Pts[i]
gl.PopMatrix()
gl.PushMatrix()
gl.Translatef(gl.Float(pt.X), gl.Float(pt.Y), -gl.Float(pt.Z))
gl.Scalef(gl.Float(pt.R*2), gl.Float(pt.R*2), gl.Float(pt.R*2))
gl.DrawArrays(gl.QUADS, 0, 24)
}
}
// Draw draws the Shape object.
func (shape *Shape) Draw() error {
gl.BindBuffer(gl.ARRAY_BUFFER, shape.vertexBuffer)
vertexAttribLoc := gl.GetAttribLocation(paunchEffect.program, gl.GLString("position"))
gl.VertexAttribPointer(gl.Uint(vertexAttribLoc), 2, gl.FLOAT, gl.FALSE, 0, gl.Offset(nil, 0))
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.EnableVertexAttribArray(gl.Uint(vertexAttribLoc))
gl.DrawArrays(shape.mode, 0, gl.Sizei(shape.size/2))
gl.DisableVertexAttribArray(gl.Uint(vertexAttribLoc))
//gl.DisableVertexAttribArray(gl.Uint(1))
//gl.BindTexture(gl.TEXTURE_2D, 0)
return checkForErrors()
}
// Draw a letter at a certain coordinate
func (w *glfwBackend) letter(lx, ly int, c int, cl RGB) {
start := 8 * (ly*w.width + lx)
vs[0] = w.verts[start]
vs[1] = w.verts[start+1]
vs[2] = w.verts[start+2]
vs[3] = w.verts[start+3]
vs[4] = w.verts[start+4]
vs[5] = w.verts[start+5]
vs[6] = w.verts[start+6]
vs[7] = w.verts[start+7]
cs[0] = cl.R
cs[1] = cl.G
cs[2] = cl.B
cs[3] = cl.R
cs[4] = cl.G
cs[5] = cl.B
cs[6] = cl.R
cs[7] = cl.G
cs[8] = cl.B
cs[9] = cl.R
cs[10] = cl.G
cs[11] = cl.B
u := float32(c%w.font.Width) * w.s
v := float32(c/w.font.Height) * w.t
ts[0] = u
ts[1] = v
ts[2] = u
ts[3] = v + w.t
ts[4] = u + w.s
ts[5] = v + w.t
ts[6] = u + w.s
ts[7] = v
gl.DrawArrays(gl.POLYGON, 0, 4)
}