mirror of
https://github.com/tanema/light_world.lua.git
synced 2024-12-24 20:24:19 +00:00
hopefully some faster shadow calculations
This commit is contained in:
Tim Anema
parent
80a2d2e389
commit
8cbb10f80d
92
lib/body.lua
92
lib/body.lua
@ -3,7 +3,7 @@ local class = require(_PACKAGE.."/class")
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local normal_map = require(_PACKAGE..'/normal_map')
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local util = require(_PACKAGE..'/util')
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local anim8 = require(_PACKAGE..'/anim8')
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local vec2 = require(_PACKAGE..'/vec2')
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local vector = require(_PACKAGE..'/vector')
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local body = class()
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body.glowShader = love.graphics.newShader(_PACKAGE.."/shaders/glow.glsl")
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@ -626,85 +626,67 @@ function body:drawShadow(light)
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end
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end
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local function isEdgeFacingLight(x1, y1, x2, y2, light)
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return vec2(-y2 + y1, x2 - x1):dot(vec2(x1 - light.x, y1 - light.y)) > 0
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end
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--using shadow point calculations from this article
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--http://web.cs.wpi.edu/~matt/courses/cs563/talks/shadow/shadow.html
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function body:drawPolyShadow(light)
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local curShadowGeometry = {}
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local lxh = (light.x * self.zheight)
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local lyh = (light.y * self.zheight)
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local lightPosition = vector(light.x, light.y)
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local lh = lightPosition * self.zheight
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local height_diff = (self.zheight - light.z)
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if height_diff == 0 then -- prevent inf
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height_diff = -0.001
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end
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local facingLight = {}
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for i = 1, #self.data, 2 do
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local j, k = (i + 2) % #self.data, (i + 4) % #self.data
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facingLight[i] = facingLight[i] ~= nil and facingLight[i] or isEdgeFacingLight(self.data[i], self.data[i+1], self.data[j], self.data[j+1], light)
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facingLight[j] = facingLight[j] ~= nil and facingLight[j] or isEdgeFacingLight(self.data[j], self.data[j+1], self.data[k], self.data[k+1], light)
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if facingLight[i] and not facingLight[j] then
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curShadowGeometry[#curShadowGeometry+1] = self.data[j]
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curShadowGeometry[#curShadowGeometry+1] = self.data[j+1]
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curShadowGeometry[#curShadowGeometry+1] = (lxh - (self.data[j] * light.z))/height_diff
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curShadowGeometry[#curShadowGeometry+1] = (lyh - (self.data[j+1] * light.z))/height_diff
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elseif not facingLight[i] and not facingLight[j] then
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curShadowGeometry[#curShadowGeometry+1] = (lxh - (self.data[j] * light.z))/height_diff
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curShadowGeometry[#curShadowGeometry+1] = (lyh - (self.data[j+1] * light.z))/height_diff
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elseif not facingLight[i] and facingLight[j] then
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curShadowGeometry[#curShadowGeometry+1] = (lxh - (self.data[j] * light.z))/height_diff
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curShadowGeometry[#curShadowGeometry+1] = (lyh - (self.data[j+1] * light.z))/height_diff
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curShadowGeometry[#curShadowGeometry+1] = self.data[j]
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curShadowGeometry[#curShadowGeometry+1] = self.data[j+1]
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local vertex = vector(self.data[i], self.data[i + 1])
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local nextVertex = vector(self.data[(i + 2) % 8], self.data[(i + 2) % 8 + 1])
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local startToEnd = nextVertex - vertex
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if vector(startToEnd.y, -startToEnd.x) * (vertex - lightPosition) > 0 then
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local point1 = (lh - (vertex * light.z))/height_diff
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local point2 = (lh - (nextVertex * light.z))/height_diff
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love.graphics.polygon("fill",
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vertex.x, vertex.y, point1.x, point1.y,
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point2.x, point2.y, nextVertex.x, nextVertex.y)
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end
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end
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if #curShadowGeometry >= 6 then
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love.graphics.polygon("fill", unpack(curShadowGeometry))
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end
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end
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--using shadow point calculations from this article
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--http://web.cs.wpi.edu/~matt/courses/cs563/talks/shadow/shadow.html
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function body:drawCircleShadow(light)
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local curShadowGeometry = {}
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local angle = math.atan2(light.x - (self.x - self.ox), (self.y - self.oy) - light.y) + math.pi / 2
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local x1 = ((self.x - self.ox) + math.sin(angle) * self.radius)
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local y1 = ((self.y - self.oy) - math.cos(angle) * self.radius)
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local x2 = ((self.x - self.ox) - math.sin(angle) * self.radius)
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local y2 = ((self.y - self.oy) + math.cos(angle) * self.radius)
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local lxh = (light.x * self.zheight)
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local lyh = (light.y * self.zheight)
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local selfPos = vector(self.x - self.ox, self.y - self.oy)
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local lightPosition = vector(light.x, light.y)
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local lh = lightPosition * self.zheight
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local height_diff = (self.zheight - light.z)
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if height_diff == 0 then -- prevent inf
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height_diff = -0.001
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end
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local x3 = (lxh - (x2 * light.z))/height_diff
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local y3 = (lyh - (y2 * light.z))/height_diff
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local x4 = (lxh - (x1 * light.z))/height_diff
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local y4 = (lyh - (y1 * light.z))/height_diff
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local angle = math.atan2(light.x - selfPos.x, selfPos.y - light.y) + math.pi / 2
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local point1 = vector(selfPos.x + math.sin(angle) * self.radius,
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selfPos.y - math.cos(angle) * self.radius)
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local point2 = vector(selfPos.x - math.sin(angle) * self.radius,
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selfPos.y + math.cos(angle) * self.radius)
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local point3 = (lh - (point1 * light.z))/height_diff
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local point4 = (lh - (point2 * light.z))/height_diff
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local radius = math.sqrt(math.pow(x4 - x3, 2) + math.pow(y4-y3, 2)) / 2
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local cx, cy = (x3 + x4)/2, (y3 + y4)/2
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local radius = point3:dist(point4)/2
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local circleCenter = (point3 + point4)/2
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if math.sqrt(math.pow(light.x - self.x, 2) + math.pow(light.y - self.y, 2)) <= self.radius then
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love.graphics.circle("fill", cx, cy, radius)
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if lightPosition:dist(selfPos) <= self.radius then
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love.graphics.circle("fill", circleCenter.x, circleCenter.y, radius)
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else
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love.graphics.polygon("fill", x1, y1, x2, y2, x3, y3, x4, y4)
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if math.sqrt(math.pow(light.x - cx, 2) + math.pow(light.y - cy, 2)) < light.range then -- dont draw circle if way off screen
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local angle1 = math.atan2(y3 - cy, x3 - cx)
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local angle2 = math.atan2(y4 - cy, x4 - cx)
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if angle1 > angle2 then
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love.graphics.arc("fill", cx, cy, radius, angle1, angle2)
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love.graphics.polygon("fill", point1.x, point1.y,
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point2.x, point2.y,
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point4.x, point4.y,
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point3.x, point3.y)
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if lightPosition:dist(circleCenter) < light.range then -- dont draw circle if way off screen
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local angle1 = math.atan2(point3.y - circleCenter.y, point3.x - circleCenter.x)
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local angle2 = math.atan2(point4.y - circleCenter.y, point4.x - circleCenter.x)
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if angle1 < angle2 then
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love.graphics.arc("fill", circleCenter.x, circleCenter.y, radius, angle1, angle2)
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else
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love.graphics.arc("fill", cx, cy, radius, angle1 - math.pi, angle2 - math.pi)
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love.graphics.arc("fill", circleCenter.x, circleCenter.y, radius, angle1 - math.pi, angle2 - math.pi)
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end
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end
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end
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@ -14,7 +14,7 @@ function util.drawCanvasToCanvas(canvas, other_canvas, options)
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love.graphics.setInvertedStencil(options["stencil"])
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end
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if options["istencil"] then
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love.graphics.setInvertedStencil(options["stencil"])
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love.graphics.setInvertedStencil(options["istencil"])
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end
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if options["color"] then
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love.graphics.setColor(unpack(options["color"]))
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27
lib/vec2.lua
27
lib/vec2.lua
@ -1,27 +0,0 @@
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local _PACKAGE = (...):match("^(.+)[%./][^%./]+") or ""
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local class = require(_PACKAGE.."/class")
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local vec2 = class()
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function vec2:init(x, y)
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self.x, self.y = x, y
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end
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function vec2:normalize()
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local len = self:length()
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return vec2(self.x / len, self.y / len)
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end
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function vec2:dot(v2)
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return (self.x * v2.x) + (self.y * v2.y)
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end
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function vec2:cross(v2)
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return ((self.x * v2.y) - (self.y * v2.x))
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end
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function vec2:length()
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return math.sqrt(self:dot(self))
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end
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return vec2
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46
lib/vector.lua
Normal file
46
lib/vector.lua
Normal file
@ -0,0 +1,46 @@
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local vector = {}
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vector.__index = vector
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local function new(x, y)
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if type(x) == "table" then
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return setmetatable({
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x = x[1],
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y = y[1]
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}, vector)
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else
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return setmetatable({
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x = x or 0,
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y = y or 0
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}, vector)
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end
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end
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function vector.__add(a, b)
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return new(a.x + b.x, a.y + b.y)
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end
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function vector.__sub(a, b)
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return new(a.x - b.x, a.y - b.y)
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end
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function vector.__mul(a, b)
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if type(b) == "number" then
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return new(a.x * b, a.y * b)
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else
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return a.x * b.x + a.y * b.y
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end
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end
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function vector.__div(a, b)
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return new(a.x / b, a.y / b)
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end
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function vector.__eq(a, b)
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return a.x == b.x and a.y == b.y
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end
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function vector:dist(b)
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return math.sqrt(math.pow(b.x - self.x, 2) + math.pow(b.y-self.y, 2))
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end
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return setmetatable({new = new}, {__call = function(_, ...) return new(...) end})
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