func drawPrep() {
gl.Disable(gl.DEPTH_TEST)
gl.Disable(gl.TEXTURE_2D)
gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.ClearStencil(0)
gl.Clear(gl.STENCIL_BUFFER_BIT)
}
func drawFloor(room *Room, floor mathgl.Mat4, temp *WallTexture, cstack base.ColorStack, los_tex *LosTexture, los_alpha float64, floor_drawer []FloorDrawer) {
gl.MatrixMode(gl.MODELVIEW)
gl.PushMatrix()
gl.LoadIdentity()
gl.MultMatrixf(&floor[0])
defer gl.PopMatrix()
gl.Enable(gl.STENCIL_TEST)
defer gl.Disable(gl.STENCIL_TEST)
gl.StencilFunc(gl.ALWAYS, 4, 4)
gl.StencilOp(gl.REPLACE, gl.REPLACE, gl.REPLACE)
gl.Disable(gl.TEXTURE_2D)
gl.Begin(gl.QUADS)
gl.Vertex2i(0, 0)
gl.Vertex2i(0, room.Size.Dy)
gl.Vertex2i(room.Size.Dx, room.Size.Dy)
gl.Vertex2i(room.Size.Dx, 0)
gl.End()
gl.StencilFunc(gl.EQUAL, 4, 15)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
// Draw the floor
gl.Enable(gl.TEXTURE_2D)
cstack.ApplyWithAlpha(los_alpha)
room.Floor.Data().Render(0, 0, float64(room.Size.Dx), float64(room.Size.Dy))
if los_tex != nil {
los_tex.Bind()
gl.BlendFunc(gl.SRC_ALPHA_SATURATE, gl.SRC_ALPHA)
gl.Color4d(0, 0, 0, 1)
gl.Begin(gl.QUADS)
gl.TexCoord2i(0, 0)
gl.Vertex2i(-room.X, -room.Y)
gl.TexCoord2i(1, 0)
gl.Vertex2i(-room.X, los_tex.Size()-room.Y)
gl.TexCoord2i(1, 1)
gl.Vertex2i(los_tex.Size()-room.X, los_tex.Size()-room.Y)
gl.TexCoord2i(0, 1)
gl.Vertex2i(los_tex.Size()-room.X, -room.Y)
gl.End()
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
}
cstack.ApplyWithAlpha(los_alpha)
{
g_texs = g_texs[0:0]
if temp != nil {
g_texs = append(g_texs, *temp)
}
for _, tex := range room.WallTextures {
g_texs = append(g_texs, *tex)
}
for i, tex := range g_texs {
if tex.X >= float32(room.Size.Dx) {
tex.Rot -= 3.1415926535 / 2
}
if temp != nil && i == 0 {
cstack.Push(1, 0.7, 0.7, 0.7)
}
cstack.ApplyWithAlpha(los_alpha)
tex.Render()
if temp != nil && i == 0 {
cstack.Pop()
}
}
}
gl.PushMatrix()
gl.Translated(-float64(room.X), -float64(room.Y), 0)
for _, fd := range floor_drawer {
fd.RenderOnFloor()
}
gl.PopMatrix()
// Re-enable textures because floor_drawer.RenderOnFloor() might have
// disabled them
gl.Enable(gl.TEXTURE_2D)
gl.StencilFunc(gl.ALWAYS, 5, 5)
gl.StencilOp(gl.REPLACE, gl.REPLACE, gl.REPLACE)
gl.Disable(gl.TEXTURE_2D)
gl.Color4d(0, 0, 0, 0)
gl.Begin(gl.QUADS)
gl.Vertex2i(0, 0)
gl.Vertex2i(0, room.Size.Dy)
gl.Vertex2i(room.Size.Dx, room.Size.Dy)
gl.Vertex2i(room.Size.Dx, 0)
gl.End()
}
// room: the wall to draw
// wall: the texture to render on the wall
// temp: an additional texture to render along with the other detail textures
// specified in room
// left,right: the xy planes of the left and right walls
func drawWall(room *Room, floor, left, right mathgl.Mat4, temp_tex *WallTexture, temp_door doorInfo, cstack base.ColorStack, los_tex *LosTexture, los_alpha float64) {
gl.Enable(gl.STENCIL_TEST)
defer gl.Disable(gl.STENCIL_TEST)
gl.MatrixMode(gl.MODELVIEW)
gl.PushMatrix()
defer gl.PopMatrix()
var dz int
if room.Wall.Data().Dx() > 0 {
dz = room.Wall.Data().Dy() * (room.Size.Dx + room.Size.Dy) / room.Wall.Data().Dx()
}
corner := float32(room.Size.Dx) / float32(room.Size.Dx+room.Size.Dy)
gl.LoadIdentity()
gl.MultMatrixf(&floor[0])
g_texs = g_texs[0:0]
if temp_tex != nil {
g_texs = append(g_texs, *temp_tex)
}
for _, tex := range room.WallTextures {
g_texs = append(g_texs, *tex)
}
do_right_wall := func() {
gl.Begin(gl.QUADS)
gl.TexCoord2f(1, 0)
gl.Vertex3i(room.Size.Dx, 0, 0)
gl.TexCoord2f(1, -1)
gl.Vertex3i(room.Size.Dx, 0, -dz)
gl.TexCoord2f(corner, -1)
gl.Vertex3i(room.Size.Dx, room.Size.Dy, -dz)
gl.TexCoord2f(corner, 0)
gl.Vertex3i(room.Size.Dx, room.Size.Dy, 0)
gl.End()
}
g_doors = g_doors[0:0]
for _, door := range room.Doors {
g_doors = append(g_doors, door)
}
if temp_door.Door != nil {
g_doors = append(g_doors, temp_door.Door)
}
alpha := 0.2
do_right_doors := func(opened bool) {
for _, door := range g_doors {
if door.Facing != FarRight {
continue
}
if door.IsOpened() != opened {
continue
}
door.TextureData().Bind()
if door == temp_door.Door {
if temp_door.Valid {
cstack.Push(0, 0, 1, alpha)
} else {
cstack.Push(1, 0, 0, alpha)
}
}
cstack.ApplyWithAlpha(alpha * los_alpha)
gl.Begin(gl.QUADS)
height := float64(door.Width*door.TextureData().Dy()) / float64(door.TextureData().Dx())
gl.TexCoord2f(1, 0)
gl.Vertex3d(float64(room.Size.Dx), float64(door.Pos), 0)
gl.TexCoord2f(1, -1)
gl.Vertex3d(float64(room.Size.Dx), float64(door.Pos), -height)
gl.TexCoord2f(0, -1)
gl.Vertex3d(float64(room.Size.Dx), float64(door.Pos+door.Width), -height)
gl.TexCoord2f(0, 0)
gl.Vertex3d(float64(room.Size.Dx), float64(door.Pos+door.Width), 0)
gl.End()
if door == temp_door.Door {
cstack.Pop()
}
}
}
// Right wall
gl.StencilFunc(gl.NOTEQUAL, 8, 7)
gl.StencilOp(gl.DECR_WRAP, gl.REPLACE, gl.REPLACE)
gl.Color4d(0, 0, 0, 0)
do_right_wall()
gl.Enable(gl.TEXTURE_2D)
cstack.ApplyWithAlpha(alpha * los_alpha)
gl.StencilFunc(gl.EQUAL, 8, 15)
gl.StencilOp(gl.KEEP, gl.ZERO, gl.ZERO)
do_right_doors(true)
cstack.ApplyWithAlpha(1.0 * los_alpha)
gl.StencilFunc(gl.EQUAL, 15, 15)
gl.StencilOp(gl.KEEP, gl.ZERO, gl.ZERO)
do_right_doors(true)
for _, alpha := range []float64{alpha, 1.0} {
cstack.ApplyWithAlpha(alpha * los_alpha)
if alpha == 1.0 {
gl.StencilFunc(gl.EQUAL, 15, 15)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
} else {
gl.StencilFunc(gl.EQUAL, 8, 15)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
}
room.Wall.Data().Bind()
do_right_wall()
gl.PushMatrix()
gl.LoadIdentity()
gl.MultMatrixf(&right[0])
for i, tex := range g_texs {
dx, dy := float32(room.Size.Dx), float32(room.Size.Dy)
if tex.Y > dy {
tex.X, tex.Y = dx+tex.Y-dy, dy+dx-tex.X
}
if tex.X > dx {
tex.Rot -= 3.1415926535 / 2
}
tex.X -= dx
if temp_tex != nil && i == 0 {
cstack.Push(1, 0.7, 0.7, 0.7)
}
cstack.ApplyWithAlpha(alpha * los_alpha)
tex.Render()
if temp_tex != nil && i == 0 {
cstack.Pop()
}
}
gl.PopMatrix()
}
cstack.ApplyWithAlpha(alpha * los_alpha)
gl.StencilFunc(gl.EQUAL, 8, 15)
do_right_doors(false)
cstack.ApplyWithAlpha(1.0 * los_alpha)
gl.StencilFunc(gl.EQUAL, 15, 15)
do_right_doors(false)
// Go back over the area we just drew on and replace it with all b0001
gl.StencilFunc(gl.ALWAYS, 1, 1)
gl.StencilOp(gl.REPLACE, gl.REPLACE, gl.REPLACE)
gl.Color4d(0, 0, 0, 0)
do_right_wall()
// Now that the entire wall has been draw we can cast shadows on it if we've
// got a los texture
if los_tex != nil {
los_tex.Bind()
gl.BlendFunc(gl.SRC_ALPHA_SATURATE, gl.SRC_ALPHA)
gl.Color4d(0, 0, 0, 1)
tx := (float64(room.X+room.Size.Dx) - 0.5) / float64(los_tex.Size())
ty := (float64(room.Y) + 0.5) / float64(los_tex.Size())
ty2 := (float64(room.Y+room.Size.Dy) - 0.5) / float64(los_tex.Size())
gl.Begin(gl.QUADS)
gl.TexCoord2d(ty, tx)
gl.Vertex3i(room.Size.Dx, 0, 0)
gl.TexCoord2d(ty, tx)
gl.Vertex3i(room.Size.Dx, 0, -dz)
gl.TexCoord2d(ty2, tx)
gl.Vertex3i(room.Size.Dx, room.Size.Dy, -dz)
gl.TexCoord2d(ty2, tx)
gl.Vertex3i(room.Size.Dx, room.Size.Dy, 0)
gl.End()
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
}
do_left_wall := func() {
gl.Begin(gl.QUADS)
gl.TexCoord2f(corner, 0)
gl.Vertex3i(room.Size.Dx, room.Size.Dy, 0)
gl.TexCoord2f(corner, -1)
gl.Vertex3i(room.Size.Dx, room.Size.Dy, -dz)
gl.TexCoord2f(0, -1)
gl.Vertex3i(0, room.Size.Dy, -dz)
gl.TexCoord2f(0, 0)
gl.Vertex3i(0, room.Size.Dy, 0)
gl.End()
}
do_left_doors := func(opened bool) {
for _, door := range g_doors {
if door.Facing != FarLeft {
continue
}
if door.IsOpened() != opened {
continue
}
door.TextureData().Bind()
if door == temp_door.Door {
if temp_door.Valid {
cstack.Push(0, 0, 1, alpha)
} else {
cstack.Push(1, 0, 0, alpha)
}
}
cstack.ApplyWithAlpha(alpha * los_alpha)
gl.Begin(gl.QUADS)
height := float64(door.Width*door.TextureData().Dy()) / float64(door.TextureData().Dx())
gl.TexCoord2f(0, 0)
gl.Vertex3d(float64(door.Pos), float64(room.Size.Dy), 0)
gl.TexCoord2f(0, -1)
gl.Vertex3d(float64(door.Pos), float64(room.Size.Dy), -height)
gl.TexCoord2f(1, -1)
gl.Vertex3d(float64(door.Pos+door.Width), float64(room.Size.Dy), -height)
gl.TexCoord2f(1, 0)
gl.Vertex3d(float64(door.Pos+door.Width), float64(room.Size.Dy), 0)
gl.End()
if door == temp_door.Door {
cstack.Pop()
}
}
}
gl.StencilFunc(gl.NOTEQUAL, 8, 7)
gl.StencilOp(gl.DECR_WRAP, gl.REPLACE, gl.REPLACE)
gl.Color4d(0, 0, 0, 0)
do_left_wall()
gl.Enable(gl.TEXTURE_2D)
cstack.ApplyWithAlpha(alpha * los_alpha)
gl.StencilFunc(gl.EQUAL, 8, 15)
gl.StencilOp(gl.KEEP, gl.ZERO, gl.ZERO)
do_left_doors(true)
cstack.ApplyWithAlpha(1.0 * los_alpha)
gl.StencilFunc(gl.EQUAL, 15, 15)
gl.StencilOp(gl.KEEP, gl.ZERO, gl.ZERO)
do_left_doors(true)
for _, alpha := range []float64{alpha, 1.0} {
if alpha == 1.0 {
gl.StencilFunc(gl.EQUAL, 15, 15)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
} else {
gl.StencilFunc(gl.EQUAL, 8, 15)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
}
room.Wall.Data().Bind()
cstack.ApplyWithAlpha(alpha * los_alpha)
do_left_wall()
gl.PushMatrix()
gl.LoadIdentity()
gl.MultMatrixf(&left[0])
for i, tex := range g_texs {
dx, dy := float32(room.Size.Dx), float32(room.Size.Dy)
if tex.X > dx {
tex.X, tex.Y = dx+dy-tex.Y, dy+tex.X-dx
}
tex.Y -= dy
if temp_tex != nil && i == 0 {
cstack.Push(1, 0.7, 0.7, 0.7)
}
cstack.ApplyWithAlpha(alpha * los_alpha)
tex.Render()
if temp_tex != nil && i == 0 {
cstack.Pop()
}
}
gl.PopMatrix()
}
cstack.ApplyWithAlpha(alpha * los_alpha)
gl.StencilFunc(gl.EQUAL, 8, 15)
do_left_doors(false)
cstack.ApplyWithAlpha(1.0 * los_alpha)
gl.StencilFunc(gl.EQUAL, 15, 15)
do_left_doors(false)
// Go back over the area we just drew on and replace it with all b0010
gl.StencilFunc(gl.ALWAYS, 2, 2)
gl.StencilOp(gl.REPLACE, gl.REPLACE, gl.REPLACE)
gl.Color4d(0, 0, 0, 0)
do_left_wall()
// Now that the entire wall has been draw we can cast shadows on it if we've
// got a los texture
if los_tex != nil {
los_tex.Bind()
gl.BlendFunc(gl.SRC_ALPHA_SATURATE, gl.SRC_ALPHA)
gl.Color4d(0, 0, 0, 1)
ty := (float64(room.Y+room.Size.Dy) - 0.5) / float64(los_tex.Size())
tx := (float64(room.X) + 0.5) / float64(los_tex.Size())
tx2 := (float64(room.X+room.Size.Dx) - 0.5) / float64(los_tex.Size())
gl.Begin(gl.QUADS)
gl.TexCoord2d(ty, tx)
gl.Vertex3i(0, room.Size.Dy, 0)
gl.TexCoord2d(ty, tx)
gl.Vertex3i(0, room.Size.Dy, -dz)
gl.TexCoord2d(ty, tx2)
gl.Vertex3i(room.Size.Dx, room.Size.Dy, -dz)
gl.TexCoord2d(ty, tx2)
gl.Vertex3i(room.Size.Dx, room.Size.Dy, 0)
gl.End()
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
}
}