Light property functions and basic light example.

examples/basic_lighting/main.lua

@@ -0,0 +1,140 @@
+-- Based on raylib [shaders] example - basic lighting by Chris Camacho (@codifies)
+-- https://github.com/TSnake41/raylib-lua/blob/master/examples/textures_bunnymark.lua
+
+package.path = package.path..";"..RL.GetBasePath().."../resources/lib/?.lua"
+
+Util = require( "utillib" )
+Vec2 = require( "vector2" )
+Vec3 = require( "vector3" )
+Cam3D = require( "camera3d" )
+
+local monitor = 0
+local camera = {}
+
+local plane = -1
+local cube = -1
+local material = -1
+local shader = -1
+local lights = {}
+
+function RL.init()
+	local mPos = Vec2:new( RL.GetMonitorPosition( monitor ) )
+	local mSize = Vec2:new( RL.GetMonitorSize( monitor ) )
+	local winSize = Vec2:new( 1028, 720 )
+
+	RL.SetWindowTitle( "Simple Lighting" )
+	RL.SetWindowState( RL.FLAG_WINDOW_RESIZABLE )
+	RL.SetWindowState( RL.FLAG_VSYNC_HINT )
+	RL.SetWindowSize( winSize )
+	RL.SetWindowPosition( { mPos.x + mSize.x / 2 - winSize.x / 2, mPos.y + mSize.y / 2 - winSize.y / 2 } )
+
+	-- Define the camera to look into our 3d world.
+	camera = Cam3D:new()
+
+	camera:setPosition( { 0, 4, 12 } )
+	camera:setTarget( { 0, 0, 0 } )
+	camera:setUp( { 0, 1, 0 } )
+	-- camera.mode = camera.MODES.ORBITAL
+	camera.mode = camera.MODES.FIRST_PERSON
+
+	RL.HideCursor()
+
+	-- Generate meshes.
+	plane = RL.GenMeshPlane( 10, 10, 3, 3 )
+	cube = RL.GenMeshCube( { 2, 4, 2 } )
+
+	-- Load basic lighting shader.
+	-- NOTE: Shaders used in this example are #version 330 (OpenGL 3.3).
+
+	-- Shader folders.
+	local glslDir = {
+		-- [ RL.RL_OPENGL_11 ] = "glsl100",
+		-- [ RL.RL_OPENGL_21 ] = "glsl120",
+		[ RL.RL_OPENGL_33 ] = "glsl330",
+		[ RL.RL_OPENGL_43 ] = "glsl330",
+		-- [ RL.RL_OPENGL_ES_20 ] = "glsl120",
+	}
+	local prefix = RL.GetBasePath().."../resources/shaders/"..glslDir[ RL.rlGetVersion() ].."/"
+
+	shader = RL.LoadShader( prefix.."lighting.vs", prefix.."lighting.fs" )
+
+	-- Get some required shader locations.
+	local viewPosLoc = RL.GetShaderLocation( shader, "viewPos" )
+	RL.SetShaderLocationIndex( shader, RL.SHADER_LOC_VECTOR_VIEW, viewPosLoc )
+	--[[
+		NOTE: "matModel" location name is automatically assigned on shader loading, 
+		no need to get the location again if using that uniform name.
+	]]--
+
+	-- Ambient light level (some basic lighting).
+	local ambientLoc = RL.GetShaderLocation( shader, "ambient" )
+	RL.SetShaderValue( shader, ambientLoc, { 0.1, 0.1, 0.1, 1.0 }, RL.SHADER_UNIFORM_VEC4 )
+
+	-- Create material.
+	local materialData = {
+		shader = shader,
+		maps = {
+			{
+				RL.MATERIAL_MAP_ALBEDO,
+				{
+					color = RL.WHITE,
+				},
+			},
+		},
+	}
+	material = RL.CreateMaterial( materialData )
+
+	-- Create lights.
+	table.insert( lights, RL.CreateLight( RL.LIGHT_POINT, { -2, 1, -2 }, RL.Vector3Zero(), RL.YELLOW, shader ) )
+	table.insert( lights, RL.CreateLight( RL.LIGHT_POINT, { 2, 1, 2 }, RL.Vector3Zero(), RL.RED, shader ) )
+	table.insert( lights, RL.CreateLight( RL.LIGHT_POINT, { -2, 1, 2 }, RL.Vector3Zero(), RL.GREEN, shader ) )
+	table.insert( lights, RL.CreateLight( RL.LIGHT_POINT, { 2, 1, -2 }, RL.Vector3Zero(), RL.BLUE, shader ) )
+end
+
+function RL.process( delta )
+	camera:process( delta )
+
+	-- Check key inputs to enable/disable lights.
+	if RL.IsKeyPressed( RL.KEY_Y ) then
+		RL.SetLightEnabled( lights[1], not RL.IsLightEnabled( lights[1] ) )
+	end
+	if RL.IsKeyPressed( RL.KEY_R ) then
+		RL.SetLightEnabled( lights[2], not RL.IsLightEnabled( lights[2] ) )
+	end
+	if RL.IsKeyPressed( RL.KEY_G ) then
+		RL.SetLightEnabled( lights[3], not RL.IsLightEnabled( lights[3] ) )
+	end
+	if RL.IsKeyPressed( RL.KEY_B ) then
+		RL.SetLightEnabled( lights[4], not RL.IsLightEnabled( lights[4] ) )
+	end
+
+	-- Update light values (actually, only enable/disable them).
+	for _, light in ipairs( lights ) do
+		RL.UpdateLightValues( shader, light )
+	end
+end
+
+function RL.draw()
+	RL.ClearBackground( { 100, 150, 100 } )
+
+	-- Update the shader with the camera view vector (points towards { 0.0f, 0.0f, 0.0f }).
+	local loc = RL.GetShaderLocationIndex( shader, RL.SHADER_LOC_VECTOR_VIEW )
+	RL.SetShaderValue( shader, loc, camera:getPosition():arr(), RL.SHADER_UNIFORM_VEC3 )
+
+	camera:beginMode3D()
+		RL.DrawMesh( plane, material, RL.MatrixIdentity() )
+		RL.DrawMesh( cube, material, RL.MatrixIdentity() )
+
+		-- Draw spheres to show where the lights are.
+		for _, light in ipairs( lights ) do
+			if RL.IsLightEnabled( light ) then
+				RL.DrawSphereEx( RL.GetLightPosition( light ), 0.2, 8, 8, RL.GetLightColor( light ) )
+			else
+				RL.DrawSphereWires( RL.GetLightPosition( light ), 0.2, 8, 8, RL.ColorAlpha( RL.GetLightColor( light ), 0.3 ) )
+			end
+		end
+
+	camera:endMode3D()
+
+	RL.DrawText( 0, "Use keys [Y][R][G][B] to toggle lights", { 10, 10 }, 20, 4, RL.DARKGRAY )
+end