// vertex draws vertices.
// Used in classic render mode.
func (a *Attr) vertex(i int) {
i *= a.size
switch a.size {
case 2:
switch v := a.data.(type) {
case []int16:
gl.Vertex2s(v[i], v[i+1])
case []int32:
gl.Vertex2i(int(v[i]), int(v[i+1]))
case []float32:
gl.Vertex2f(v[i], v[i+1])
case []float64:
gl.Vertex2d(v[i], v[i+1])
}
case 3:
switch v := a.data.(type) {
case []int16:
gl.Vertex3s(v[i], v[i+1], v[i+2])
case []int32:
gl.Vertex3i(int(v[i]), int(v[i+1]), int(v[i+2]))
case []float32:
gl.Vertex3f(v[i], v[i+1], v[i+2])
case []float64:
gl.Vertex3d(v[i], v[i+1], v[i+2])
}
case 4:
switch v := a.data.(type) {
case []int16:
gl.Vertex4s(v[i], v[i+1], v[i+2], v[i+3])
case []int32:
gl.Vertex4i(int(v[i]), int(v[i+1]), int(v[i+2]), int(v[i+3]))
case []float32:
gl.Vertex4f(v[i], v[i+1], v[i+2], v[i+3])
case []float64:
gl.Vertex4d(v[i], v[i+1], v[i+2], v[i+3])
}
}
}
func (d *DisplayEngine) drawFrame() {
toDraw := make([][]*resources.Bitmap, d.config.MapW*d.config.MapH)
drawPasses := 0
for x := 0; x < d.config.MapW; x++ {
for y := 0; y < d.config.MapH; y++ {
toDraw[x*d.config.MapW+y] = (*d.gameEngine).GetTile(x, y)
length := len(toDraw[x*d.config.MapW+y])
if length > drawPasses {
drawPasses = length
}
}
}
viewport := d.viewport
font := allegro.CreateBuiltinFont()
// Don't want anyone changing the viewport mid frame or any such highjinks
d.Display.SetTargetBackbuffer()
allegro.RunInThread(func() {
r, g, b, a := d.config.BGColor.GetRGBA()
gl.ClearColor(
gl.GLclampf(r)/255.0,
gl.GLclampf(g)/255.0,
gl.GLclampf(b)/255.0,
gl.GLclampf(a)/255.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
viewport.SetupTransform()
for p := 0; p < drawPasses; p++ {
m := d.config.MapW
n := d.config.MapH
for s := 0; s < m+n; s++ {
for x := 0; x < s; x++ {
y := s - x - 1
if x >= m || y < 0 || y >= n {
continue
}
if len(toDraw[x*d.config.MapW+y]) < p {
continue
}
// Coordinates in terms of pixels
px := (y - x) * d.config.TileW / 2
py := (x + y) * d.config.TileH / 2
bmp := toDraw[x*d.config.MapW+y][p]
/* ox := bmp.OffX
oy := bmp.OffY*/
bw, bh := bmp.W, bmp.H
if viewport.OnScreen(px, py, bw, bh) {
gl.Begin(gl.QUADS)
bmp.Tex.Bind(gl.TEXTURE_2D)
gl.TexCoord2f(0, 0)
gl.Vertex3i(px, py, 0)
gl.TexCoord2f(0, 1)
gl.Vertex3i(px, py+bw, 0)
gl.TexCoord2f(1, 1)
gl.Vertex3i(px+bh, py+bw, 0)
gl.TexCoord2f(1, 0)
gl.Vertex3i(px+bh, py, 0)
gl.End()
}
}
}
}
gl.Flush()
})
var trans allegro.Transform
trans.Identity()
trans.Use()
font.Draw(allegro.CreateColor(0, 255, 0, 255), 0, 0, 0, fmt.Sprint(int(d.fps)))
allegro.Flip()
d.frameDrawing.Unlock()
}