Merge pull request #75 from KelseyHigham/circular-shadows-example

Circular shadows example

examples/Lighting/Circular_Shadows/main.lua

@@ -0,0 +1,110 @@
+function lovr.load()
+
+	-- shadow shader
+	shadowVertex = [[
+		out vec3 fragPos;
+
+		vec4 position(mat4 projection, mat4 transform, vec4 vertex) 
+		{ 
+			fragPos = vec3(lovrModel * vertex);
+			return projection * transform * vertex; 
+		}
+	]]
+	shadowFragment = [[
+		in vec3 fragPos;
+		uniform vec4 left;
+		uniform vec4 right;
+		uniform vec4 head;
+
+		vec4 color(vec4 graphicsColor, sampler2D image, vec2 uv) 
+		{
+			vec4 shadowColor;
+			if (                                       // w is radius
+				(   length( left.xz - fragPos.xz) <  left.w   &&    left.y > fragPos.y   ) ||
+				(   length(right.xz - fragPos.xz) < right.w   &&   right.y > fragPos.y   ) ||
+				(   length( head.xz - fragPos.xz) <  head.w   &&    head.y > fragPos.y   )
+			) {
+				shadowColor = vec4(.25, .625, 1, 1);
+			} else {
+				shadowColor = vec4(1, 1, 1, 1);
+			}
+			return shadowColor * graphicsColor * lovrDiffuseColor * vertexColor * texture(image, uv);
+		}
+	]]
+	shadowShader = lovr.graphics.newShader(shadowVertex, shadowFragment)
+
+	-- grass texture
+	grasstexturewidth = 256
+	grassimage = lovr.data.newImage(grasstexturewidth, grasstexturewidth)
+	for x=0,grasstexturewidth-1 do
+		for y=0,grasstexturewidth-1 do
+			grassimage:setPixel(x, y, 
+				lovr.math.noise(x+.5, y+.5 +  0) / 2,
+				lovr.math.noise(x+.5, y+.5 + 16) / 2 + .5,
+				lovr.math.noise(x+.5, y+.5 + 32) / 2
+			)
+		end
+	end
+	grasstexture = lovr.graphics.newTexture(grassimage)
+	grasstexture:setFilter('nearest')
+	grassmaterial = lovr.graphics.newMaterial(grasstexture)
+
+	-- boxes
+	boxes = {}
+	for i=1,5 do
+		table.insert(boxes, {
+			x      = lovr.math.random() / 2,
+			y      = lovr.math.random() / 2 + .5,
+			z      = lovr.math.random() / 2,
+			width  = lovr.math.random() / 3,
+			height = lovr.math.random() / 3,
+			depth  = lovr.math.random() / 3,
+			r      = lovr.math.random(),
+			g      = lovr.math.random(),
+			b      = lovr.math.random()
+		})
+	end
+
+end
+
+
+
+function lovr.update()
+
+	left = vec3(lovr.headset.getPosition('left'))
+	right = vec3(lovr.headset.getPosition('right'))
+	head = vec3(mat4(lovr.headset.getPose('head')):translate(0, -.1, -.1))
+
+	shadowShader:send('left',  { left.x,  left.y,  left.z, .05}) -- x, y, z, radius
+	shadowShader:send('right', {right.x, right.y, right.z, .05})
+	shadowShader:send('head',  { head.x,  head.y,  head.z, .1 })
+
+end
+
+
+
+function lovr.draw()
+
+	-- sky
+	lovr.graphics.setBackgroundColor(0,.5,1)
+
+	-- grass
+	lovr.graphics.setColor(1, 1, 1)
+	lovr.graphics.setShader(shadowShader)
+	lovr.graphics.box(grassmaterial, 0, 0, 0, 10, 1, 10)
+	lovr.graphics.setShader()
+
+	-- boxes
+	lovr.graphics.setShader(shadowShader)
+	for _,box in pairs(boxes) do
+		lovr.graphics.setColor(box.r, box.g, box.b)
+		lovr.graphics.box('fill', box.x, box.y, box.z, box.width, box.height, box.depth)
+	end
+	lovr.graphics.setShader()
+
+	-- hands
+	lovr.graphics.setColor(.9, .7, .1)
+	lovr.graphics.sphere(vec3(lovr.headset.getPosition('left')), .05)
+	lovr.graphics.sphere(vec3(lovr.headset.getPosition('right')), .05)
+
+end