From 41a7a40ecf71613c6cb3f7823491c45d9c9c63e0 Mon Sep 17 00:00:00 2001
From: ubq323 <ubq323@ubq323.website>
Date: Thu, 23 Feb 2023 11:53:10 +0000
Subject: implement new rendering system using gpu instancing

this has extremely better performance on my machine

also, player is circle now
---
 client/drawing2.lua | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 client/drawing2.lua

(limited to 'client/drawing2.lua')

diff --git a/client/drawing2.lua b/client/drawing2.lua
new file mode 100644
index 0000000..e09d7dc
--- /dev/null
+++ b/client/drawing2.lua
@@ -0,0 +1,144 @@
+local CHUNK_SIZE = require"common.constants".CHUNK_SIZE
+local coords = require"common.coords"
+
+local tau = 2*math.pi
+
+-- funny hexagon
+local vertices = {}
+-- v[1] {0,0}, fill
+-- v[2-7] edge, fill
+-- v[8-13] inner, outline
+-- v[14-19] outer, outline
+local map = {}
+
+do
+	local function ix(n) return n%6 end
+	local function th(n) return tau*(ix(n)+0.5)/6 end
+	local cos,sin = math.cos,math.sin
+	local OLWIDTH = 0.11
+	local hw = OLWIDTH/2
+	local ri,ro = 1-hw,1+hw
+	local function ve(n,f) return {cos(th(n)),sin(th(n)), f} end
+	local function vi(n,f) return {ri*cos(th(n)),ri*sin(th(n)), f} end
+	local function vo(n,f) return {ro*cos(th(n)),ro*sin(th(n)), f} end
+	local function apv(...) for _,x in ipairs({...}) do table.insert(vertices,x) end end
+	local function apm(...) for _,x in ipairs({...}) do table.insert(map,x) end end
+	
+	vertices[1] = {0,0, 1}
+	for n=0,5 do apv(ve(n,1)) end
+	for n=0,5 do apv(vi(n,0)) end
+	for n=0,5 do apv(vo(n,0)) end
+
+	-- fill area
+	for n=0,5 do apm(1, 2+n, 2+ix(1+n) ) end
+
+	local function ii(n) return 8+ix(n) end
+	local function oi(n) return 14+ix(n) end
+
+	-- outline area
+	for n=0,5 do
+		apm( ii(n), oi(n), oi(n+1) )
+		apm( ii(n), oi(n+1), ii(n+1) )
+	end
+end
+
+local shape_mesh = love.graphics.newMesh({
+	{"VertexPosition","float",2},
+	{"fillness","float",1},
+},vertices,"triangles","static")
+shape_mesh:setVertexMap(map)
+
+local function c(...) return {love.math.colorFromBytes(...)} end
+-- taken from breadquest
+local colors = {
+	{0,0,0},
+	c(255,64,64),	-- red
+	c(255,128,0),	-- orange
+	c(192,192,64),	-- yellow
+	c(0,192,0),		-- green
+	c(0,192,192),	-- teal
+	c(64,64,255),	-- blue
+	c(192,0,192),	-- purple
+	c(128,128,128),	-- grey
+
+	c(0xe7,0x9e,0), -- ubqorange
+}
+
+local shader = love.graphics.newShader([[
+#pragma language glsl3
+
+const mat2 hex_to_pos = mat2( sqrt(3), 0, sqrt(3)/2, 1.5);
+#define CHUNK_SIZE ]]..tostring(CHUNK_SIZE)..[[.0
+
+
+uniform vec3 colors[10];
+
+uniform float zoom;
+
+attribute float tile_type;
+attribute float fillness;
+
+varying vec4 tcol;
+
+const float zthr0 = 2.7;
+const float zthr1 = 6;
+const float zthrd = zthr1-zthr0;
+
+vec4 position(mat4 transform_projection, vec4 vertex_position)
+{
+
+
+	vec2 instance_pos = vec2( floor(love_InstanceID/CHUNK_SIZE), mod(love_InstanceID, CHUNK_SIZE) );
+	vertex_position.xy += hex_to_pos * instance_pos;
+
+	float a = clamp( (zoom-zthr0)/zthrd, 0, 1);
+	a = max(fillness, a);
+	
+	int tidx = int(tile_type);
+	tcol = (tidx == 0) ? vec4(0.0) : vec4(fillness*colors[tidx], a);
+	
+	
+	return transform_projection * vertex_position;
+}
+]],[[
+#pragma language glsl3
+
+varying vec4 tcol;
+vec4 effect(vec4 color, Image tex, vec2 texture_coords, vec2 screen_coords)
+{
+	// return vec4(tcol.xyz,0.5);
+	return tcol;
+}
+]])
+
+shader:send("colors",unpack(colors))
+
+
+local function set_imesh(im)
+	shape_mesh:detachAttribute("tile_type")
+	shape_mesh:attachAttribute("tile_type",im,"perinstance")
+end
+
+local function draw_map(camera,map)
+	shader:send("zoom",camera.zoom)
+	love.graphics.setShader(shader)
+
+	local count = CHUNK_SIZE*CHUNK_SIZE
+	for _,ch in map:iter_chunks() do
+		if ch then
+			-- todo: skip chunks that aren't on screen, maybe
+			local htl,hbr = ch.cp:extents()
+			local tl = htl:to_pos()
+
+			set_imesh(ch.imesh)
+			love.graphics.drawInstanced(shape_mesh, count, tl.x, tl.y)
+		end
+	end
+
+	love.graphics.setShader()
+end
+
+
+
+
+return {draw_map=draw_map}
-- 
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