func (wt *WallTexture) setupGlStuff(x, y, dx, dy int, gl_ids *wallTextureGlIds) {
if gl_ids.vbuffer != 0 {
gl.DeleteBuffers(1, (*gl.Uint)(&gl_ids.vbuffer))
gl.DeleteBuffers(1, (*gl.Uint)(&gl_ids.left_buffer))
gl.DeleteBuffers(1, (*gl.Uint)(&gl_ids.right_buffer))
gl.DeleteBuffers(1, (*gl.Uint)(&gl_ids.floor_buffer))
gl_ids.vbuffer = 0
gl_ids.left_buffer = 0
gl_ids.right_buffer = 0
gl_ids.floor_buffer = 0
}
// All vertices for both walls and the floor will go here and get sent to
// opengl all at once
var vs []roomVertex
// Conveniently casted values
frx := float32(x)
fry := float32(y)
frdx := float32(dx)
frdy := float32(dy)
tdx := float32(wt.Texture.Data().Dx()) / 100
tdy := float32(wt.Texture.Data().Dy()) / 100
wtx := wt.X
wty := wt.Y
wtr := wt.Rot
if wtx > frdx {
wtr -= 3.1415926535 / 2
}
// Floor
verts := []mathgl.Vec2{
{-tdx / 2, -tdy / 2},
{-tdx / 2, tdy / 2},
{tdx / 2, tdy / 2},
{tdx / 2, -tdy / 2},
}
var m, run mathgl.Mat3
run.Identity()
m.Translation(wtx, wty)
run.Multiply(&m)
m.RotationZ(wtr)
run.Multiply(&m)
if wt.Flip {
m.Scaling(-1, 1)
run.Multiply(&m)
}
for i := range verts {
verts[i].Transform(&run)
}
p := mathgl.Poly(verts)
p.Clip(&mathgl.Seg2{A: mathgl.Vec2{0, 0}, B: mathgl.Vec2{0, frdy}})
p.Clip(&mathgl.Seg2{A: mathgl.Vec2{0, frdy}, B: mathgl.Vec2{frdx, frdy}})
p.Clip(&mathgl.Seg2{A: mathgl.Vec2{frdx, frdy}, B: mathgl.Vec2{frdx, 0}})
p.Clip(&mathgl.Seg2{A: mathgl.Vec2{frdx, 0}, B: mathgl.Vec2{0, 0}})
if len(p) >= 3 {
// floor indices
var is []uint16
for i := 1; i < len(p)-1; i++ {
is = append(is, uint16(len(vs)+0))
is = append(is, uint16(len(vs)+i))
is = append(is, uint16(len(vs)+i+1))
}
gl.GenBuffers(1, (*gl.Uint)(&gl_ids.floor_buffer))
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.Uint(gl_ids.floor_buffer))
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, gl.Sizeiptr(int(unsafe.Sizeof(is[0]))*len(is)), gl.Pointer(&is[0]), gl.STATIC_DRAW)
gl_ids.floor_count = gl.Sizei(len(is))
run.Inverse()
for i := range p {
v := mathgl.Vec2{p[i].X, p[i].Y}
v.Transform(&run)
vs = append(vs, roomVertex{
x: p[i].X,
y: p[i].Y,
u: v.X/tdx + 0.5,
v: -(v.Y/tdy + 0.5),
los_u: (fry + p[i].Y) / LosTextureSize,
los_v: (frx + p[i].X) / LosTextureSize,
})
}
}
// Left Wall
verts = []mathgl.Vec2{
{-tdx / 2, -tdy / 2},
{-tdx / 2, tdy / 2},
{tdx / 2, tdy / 2},
{tdx / 2, -tdy / 2},
}
run.Identity()
m.Translation(wtx, wty)
run.Multiply(&m)
m.RotationZ(wtr)
run.Multiply(&m)
if wt.Flip {
m.Scaling(-1, 1)
run.Multiply(&m)
}
for i := range verts {
verts[i].Transform(&run)
}
p = mathgl.Poly(verts)
p.Clip(&mathgl.Seg2{A: mathgl.Vec2{0, 0}, B: mathgl.Vec2{0, frdy}})
p.Clip(&mathgl.Seg2{B: mathgl.Vec2{0, frdy}, A: mathgl.Vec2{frdx, frdy}})
p.Clip(&mathgl.Seg2{A: mathgl.Vec2{frdx, frdy}, B: mathgl.Vec2{frdx, 0}})
if len(p) >= 3 {
// floor indices
var is []uint16
for i := 1; i < len(p)-1; i++ {
is = append(is, uint16(len(vs)+0))
is = append(is, uint16(len(vs)+i))
is = append(is, uint16(len(vs)+i+1))
}
gl.GenBuffers(1, (*gl.Uint)(&gl_ids.left_buffer))
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.Uint(gl_ids.left_buffer))
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, gl.Sizeiptr(int(unsafe.Sizeof(is[0]))*len(is)), gl.Pointer(&is[0]), gl.STATIC_DRAW)
gl_ids.left_count = gl.Sizei(len(is))
run.Inverse()
for i := range p {
v := mathgl.Vec2{p[i].X, p[i].Y}
v.Transform(&run)
vs = append(vs, roomVertex{
x: p[i].X,
y: frdy,
z: frdy - p[i].Y,
u: v.X/tdx + 0.5,
v: -(v.Y/tdy + 0.5),
los_u: (fry + frdy - 0.5) / LosTextureSize,
los_v: (frx + p[i].X) / LosTextureSize,
})
}
}
// Right Wall
verts = []mathgl.Vec2{
{-tdx / 2, -tdy / 2},
{-tdx / 2, tdy / 2},
{tdx / 2, tdy / 2},
{tdx / 2, -tdy / 2},
}
run.Identity()
m.Translation(wtx, wty)
run.Multiply(&m)
m.RotationZ(wtr)
run.Multiply(&m)
if wt.Flip {
m.Scaling(-1, 1)
run.Multiply(&m)
}
for i := range verts {
verts[i].Transform(&run)
}
p = mathgl.Poly(verts)
p.Clip(&mathgl.Seg2{A: mathgl.Vec2{0, frdy}, B: mathgl.Vec2{frdx, frdy}})
p.Clip(&mathgl.Seg2{B: mathgl.Vec2{frdx, frdy}, A: mathgl.Vec2{frdx, 0}})
p.Clip(&mathgl.Seg2{A: mathgl.Vec2{frdx, 0}, B: mathgl.Vec2{0, 0}})
if len(p) >= 3 {
// floor indices
var is []uint16
for i := 1; i < len(p)-1; i++ {
is = append(is, uint16(len(vs)+0))
is = append(is, uint16(len(vs)+i))
is = append(is, uint16(len(vs)+i+1))
}
gl.GenBuffers(1, (*gl.Uint)(&gl_ids.right_buffer))
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.Uint(gl_ids.right_buffer))
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, gl.Sizeiptr(int(unsafe.Sizeof(is[0]))*len(is)), gl.Pointer(&is[0]), gl.STATIC_DRAW)
gl_ids.right_count = gl.Sizei(len(is))
run.Inverse()
for i := range p {
v := mathgl.Vec2{p[i].X, p[i].Y}
v.Transform(&run)
vs = append(vs, roomVertex{
x: frdx,
y: p[i].Y,
z: frdx - p[i].X,
u: v.X/tdx + 0.5,
v: -(v.Y/tdy + 0.5),
los_u: (fry + p[i].Y) / LosTextureSize,
los_v: (frx + frdx - 0.5) / LosTextureSize,
})
}
}
if len(vs) > 0 {
gl.GenBuffers(1, (*gl.Uint)(&gl_ids.vbuffer))
gl.BindBuffer(gl.ARRAY_BUFFER, gl.Uint(gl_ids.vbuffer))
size := int(unsafe.Sizeof(roomVertex{}))
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(size*len(vs)), gl.Pointer(&vs[0].x), gl.STATIC_DRAW)
}
}
