Stencil reflection example.

1 files changed, 67 insertions, 0 deletions

diff --git a/examples/stencil_reflection/main.lua b/examples/stencil_reflection/main.lua
new file mode 100644
index 0000000..9b57a47
--- /dev/null
+++ b/examples/stencil_reflection/main.lua
@@ -0,0 +1,67 @@
+-- Based on JeffM2501 stencil_reflection example for Raylib https://github.com/raylib-extras/examples-cpp/blob/main/stencil_reflection/main.cpp
+
+package.path = package.path..";"..RL.GetBasePath().."../resources/lib/?.lua"
+
+Vec2 = require( "vector2" )
+Cam3D = require( "camera3d" )
+
+local monitor = 0
+local camera = Cam3D:new()
+
+function RL.init()
+	RL.SetWindowTitle( "Stencil Reflection" )
+	RL.SetWindowState( RL.FLAG_VSYNC_HINT )
+	RL.SetWindowState( RL.FLAG_WINDOW_RESIZABLE )
+
+	local mPos = Vec2:new( RL.GetMonitorPosition( monitor ) )
+	local mSize = Vec2:new( RL.GetMonitorSize( monitor ) )
+	local winSize = Vec2:new( RL.GetScreenSize() )
+
+	RL.SetWindowPosition( { mPos.x + mSize.x / 2 - winSize.x / 2, mPos.y + mSize.y / 2 - winSize.y / 2 } )
+
+	camera:setPosition( { 0, 2, 6 } )
+	camera:setTarget( { 0, 0, 0 } )
+	camera:setUp( { 0, 1, 0 } )
+	camera.mode = camera.MODES.ORBITAL
+end
+
+function RL.update( delta )
+	camera:update( delta )
+
+	if RL.IsKeyPressed( RL.KEY_SPACE ) then
+		if camera.mode == camera.MODES.FREE then
+			camera.mode = camera.MODES.FIRST_PERSON
+		else
+			camera.mode = camera.MODES.FREE
+		end
+	end
+end
+
+function RL.draw()
+	RL.ClearBackground( RL.BLACK )
+
+	camera:beginMode3D()
+		RL.DrawCube( { 0, 0.5, 0 }, { 1, 1, 1 }, RL.DARKGREEN )
+		RL.rlDrawRenderBatchActive()
+
+		RL.glEnable( RL.GL_STENCIL_TEST )
+
+		RL.glStencilFunc( RL.GL_ALWAYS, 1, 0xFF ) -- Set any stencil to 1
+		RL.glStencilOp( RL.GL_KEEP, RL.GL_KEEP, RL.GL_REPLACE )
+		RL.glStencilMask( 0xFF ) -- Write to stencil buffer.
+		RL.rlDisableDepthMask()
+		RL.glClear( RL.GL_STENCIL_BUFFER_BIT ) -- Clear stencil buffer (0 by default)
+
+		RL.DrawPlane( { 0, 0, 0 }, { 3, 3 }, RL.DARKBLUE )
+		RL.rlDrawRenderBatchActive()
+
+		RL.glStencilFunc( RL.GL_EQUAL, 1, 0xFF ) -- Pass test if stencil value is 1.
+		RL.glStencilMask( 0x00 ) -- Don't write anything to stencil buffer.
+		RL.rlEnableDepthMask()
+
+		RL.DrawCube( { 0, -0.5, 0 }, { 1, 1, 1 }, RL.ColorAlpha( RL.DARKGREEN, 0.5 ) )
+		RL.rlDrawRenderBatchActive()
+
+		RL.glDisable( RL.GL_STENCIL_TEST )
+	camera:endMode3D()
+end