Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 1 | local node = Node:extend('nodes.shadertoy', {}) |
| 2 | |
| 3 | local smallFont = love.graphics.newFont('fonts/Lato-Light.ttf', 20) |
| 4 | |
| 5 | function node:init(config) |
| 6 | node.super.init(self, config) |
| 7 | |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 8 | self.prevShaderData = nil |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 9 | self.path = self.path or "test.glsl" |
| 10 | self.resolution = self.resolution or {1280, 720} |
| 11 | |
| 12 | self:loadShader() |
| 13 | end |
| 14 | |
| 15 | function node:beforeEnter() |
| 16 | self:loadShader() |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 17 | if self.iSystem and self.iSystem.iGlobalTime then |
| 18 | print("Resetting time") |
| 19 | self.iSystem.iGlobalTime = 0 |
| 20 | end |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 21 | end |
| 22 | |
| 23 | function node:loadShader() |
| 24 | local iSystem = {} |
| 25 | local header = "" |
| 26 | local ender=[[ |
| 27 | vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) { |
| 28 | vec2 fragCoord = texture_coords * iResolution.xy; |
| 29 | mainImage( color, fragCoord ); |
| 30 | return color; |
| 31 | } |
| 32 | ]] |
| 33 | local file = io.open(self.path, "r") |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 34 | |
| 35 | if file == nil then |
| 36 | self.shaderLoadError = self.path .. " does not exist" |
| 37 | return |
| 38 | end |
| 39 | |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 40 | local shaderData = file:read("*all") |
| 41 | |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 42 | if self.prevShaderData == shaderData then |
| 43 | print("Shader didn't change, not reloading") |
| 44 | return |
| 45 | end |
| 46 | |
| 47 | self.prevShaderData = shaderData |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 48 | shaderData = string.gsub(shaderData,"texture2D","Texel") |
| 49 | shaderData = string.gsub(shaderData,"iTime","iGlobalTime") |
| 50 | shaderData = string.gsub(shaderData,"precision highp float;","") |
| 51 | |
| 52 | if string.find(shaderData,"iGlobalTime") then |
| 53 | iSystem.iGlobalTime=0 |
| 54 | if not string.find(shaderData,"number iGlobalTime") then |
| 55 | header="extern number iGlobalTime;\n"..header |
| 56 | end |
| 57 | end |
| 58 | |
| 59 | -- TODO |
| 60 | -- if string.find(shaderData,"iChannel") then |
| 61 | -- iSystem.iChannel={} |
| 62 | -- for k,v in pairs(shaderChannel) do |
| 63 | -- header="extern Image iChannel"..k..";\n"..header |
| 64 | -- end |
| 65 | -- end |
| 66 | |
| 67 | if string.find(shaderData,"iMouse") then |
| 68 | iSystem.iMouse = {0, 0, -1, -1} |
| 69 | header = "extern vec4 iMouse;\n"..header |
| 70 | end |
| 71 | |
| 72 | if string.find(shaderData,"iResolution") then |
| 73 | iSystem.iResolution = {self.resolution[1], self.resolution[2],1} |
| 74 | header = "extern vec3 iResolution;\n"..header |
| 75 | end |
| 76 | |
| 77 | shaderData = header..shaderData |
| 78 | if not string.find(shaderData,"vec4 effect") then |
| 79 | shaderData = shaderData.."\n"..ender |
| 80 | end |
| 81 | |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 82 | print("Shader loaded, compiling...") |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 83 | |
| 84 | self.shaderLoadError = nil |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 85 | shaderLoaded, shader = pcall(love.graphics.newShader, shaderData) |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 86 | if not shaderLoaded then |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 87 | print("Shader compile failed:", shader) |
| 88 | self.shaderLoadError = shader |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 89 | else |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 90 | self.shader = shader |
| 91 | |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 92 | if iSystem.iResolution then |
| 93 | self.shader:send("iResolution",iSystem.iResolution) |
| 94 | end |
| 95 | |
| 96 | self.iSystem = iSystem |
| 97 | self.canvas = love.graphics.newCanvas(self.resolution[1], self.resolution[2]) |
| 98 | self.renderCanvas = love.graphics.newCanvas(self.resolution[1], self.resolution[2]) |
| 99 | end |
| 100 | end |
| 101 | |
| 102 | function node:update(dt) |
| 103 | if self.shader ~= nil then |
| 104 | if self.iSystem.iGlobalTime then |
| 105 | self.iSystem.iGlobalTime=self.iSystem.iGlobalTime+dt |
| 106 | self.shader:send("iGlobalTime", self.iSystem.iGlobalTime) |
| 107 | end |
| 108 | end |
| 109 | end |
| 110 | |
| 111 | function node:render() |
| 112 | love.graphics.setColor( 0, 0, 0 ) |
| 113 | love.graphics.rectangle("fill", 0, 0, love.graphics.getWidth(), love.graphics.getHeight()) |
| 114 | |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 115 | if self.shader ~= nil then |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 116 | oldCanvas = love.graphics.getCanvas( ) |
| 117 | love.graphics.setColor( 1.0, 1.0, 1.0 ) |
| 118 | self.canvas:renderTo(function () |
| 119 | love.graphics.setShader(self.shader) |
| 120 | love.graphics.draw(self.renderCanvas) |
| 121 | love.graphics.setShader() |
| 122 | end) |
| 123 | love.graphics.setCanvas(oldCanvas) |
| 124 | |
| 125 | love.graphics.draw(self.canvas,0,0,math.pi,love.graphics.getWidth() / self.resolution[1], love.graphics.getHeight() / self.resolution[2], self.resolution[1], self.resolution[2]) |
| 126 | end |
Piotr Dobrowolski | a7dbf25 | 2022-07-08 00:21:37 +0200 | [diff] [blame] | 127 | |
| 128 | if self.shaderLoadError ~= nil then |
| 129 | love.graphics.setColor(1.0, 0.0, 0.0, 1.0) |
| 130 | love.graphics.setFont(smallFont) |
| 131 | love.graphics.printf(self.shaderLoadError, 0, 0.1*love.graphics.getHeight(), love.graphics.getWidth(), 'left'); |
| 132 | end |
Serge Bazanski | 18c1a26 | 2022-07-07 14:24:53 +0200 | [diff] [blame] | 133 | end |
| 134 | |
| 135 | return node |