Blend modes example.

5 files changed, 192 insertions, 8 deletions

diff --git a/LICENSE b/LICENSE
index 01b385f..c902b85 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2022-2024 Jussi Viitala
+Copyright (c) 2022-2025 Jussi Viitala
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/changelog b/changelog
index 2ea7814..c20be91 100644
--- a/changelog
+++ b/changelog
@@ -37,6 +37,7 @@ DETAILED CHANGES:
 	- CHANGE: SetBufferData takes table of values.
 	- ADDED: Texture atlas repeat example.
 	- CHANGE: UpdateTexture and UpdateTextureRec now take pixel data as Buffer.
+	- ADDED: Blend modes example.
 
 ------------------------------------------------------------------------
 Release:	ReiLua version 0.8.0		Using Raylib 5.0 and Forked Raygui 4.0
diff --git a/devnotes b/devnotes
index b824569..3aadf64 100644
--- a/devnotes
+++ b/devnotes
@@ -21,7 +21,6 @@ Backlog {
 	* Textures
 		* Try making atlas packer with stbrp_pack_rects.
 	* Examples
-		* Improve Dungeon crawler example by generating custom mesh instead of drawing 3D quads.
 		* Platformer example physics update for true framerate independence.
 	* Android support
 }
diff --git a/examples/blend_modes/main.lua b/examples/blend_modes/main.lua
new file mode 100644
index 0000000..3a99147
--- /dev/null
+++ b/examples/blend_modes/main.lua
@@ -0,0 +1,187 @@
+package.path = package.path..";"..RL.GetBasePath().."../resources/lib/?.lua"
+
+Vector2 = require( "vector2" )
+
+local monitor = 0
+local winSize = Vector2:new( 1920, 1080 )
+
+local catTex = nil
+local tileTex = nil
+local lightTex = nil
+local lightTexSize = Vector2:new()
+
+local buttonSize = Vector2:new( 20, 20 )
+local fontSize = 20
+local textTint = RL.BLACK
+
+local framebuffer = nil
+
+local blendMode = {
+	mode = 1,
+	options = {
+		{ name = "BLEND_ALPHA", value = RL.BLEND_ALPHA },
+		{ name = "BLEND_ADDITIVE", value = RL.BLEND_ADDITIVE },
+		{ name = "BLEND_MULTIPLIED", value = RL.BLEND_MULTIPLIED },
+		{ name = "BLEND_ADD_COLORS", value = RL.BLEND_ADD_COLORS },
+		{ name = "BLEND_SUBTRACT_COLORS", value = RL.BLEND_SUBTRACT_COLORS },
+		{ name = "BLEND_ALPHA_PREMULTIPLY", value = RL.BLEND_ALPHA_PREMULTIPLY },
+		{ name = "BLEND_CUSTOM", value = RL.BLEND_CUSTOM },
+		{ name = "BLEND_CUSTOM_SEPARATE", value = RL.BLEND_CUSTOM_SEPARATE },
+	}
+}
+local blendFactor = {
+	srcRGB = 1,
+	dstRGB = 1,
+	srcAlpha = 1,
+	dstAlpha = 1,
+	options = {
+		{ name = "RL_ZERO", value = RL.RL_ZERO },
+		{ name = "RL_ONE", value = RL.RL_ONE },
+		{ name = "RL_SRC_COLOR", value = RL.RL_SRC_COLOR },
+		{ name = "RL_ONE_MINUS_SRC_COLOR", value = RL.RL_ONE_MINUS_SRC_COLOR },
+		{ name = "RL_SRC_ALPHA", value = RL.RL_SRC_ALPHA },
+		{ name = "RL_ONE_MINUS_SRC_ALPHA", value = RL.RL_ONE_MINUS_SRC_ALPHA },
+		{ name = "RL_DST_ALPHA", value = RL.RL_DST_ALPHA },
+		{ name = "RL_ONE_MINUS_DST_ALPHA", value = RL.RL_ONE_MINUS_DST_ALPHA },
+		{ name = "RL_DST_COLOR", value = RL.RL_DST_COLOR },
+		{ name = "RL_ONE_MINUS_DST_COLOR", value = RL.RL_ONE_MINUS_DST_COLOR },
+		{ name = "RL_SRC_ALPHA_SATURATE", value = RL.RL_SRC_ALPHA_SATURATE },
+		{ name = "RL_CONSTANT_COLOR", value = RL.RL_CONSTANT_COLOR },
+		{ name = "RL_ONE_MINUS_CONSTANT_COLOR", value = RL.RL_ONE_MINUS_CONSTANT_COLOR },
+		{ name = "RL_CONSTANT_ALPHA", value = RL.RL_CONSTANT_ALPHA },
+		{ name = "RL_ONE_MINUS_CONSTANT_ALPHA", value = RL.RL_ONE_MINUS_CONSTANT_ALPHA },
+	}
+}
+local blendFunction = {
+	eqRGB = 1,
+	eqAlpha = 1,
+	options = {
+		{ name = "RL_FUNC_ADD", value = RL.RL_FUNC_ADD },
+		{ name = "RL_MIN", value = RL.RL_MIN },
+		{ name = "RL_MAX", value = RL.RL_MAX },
+		{ name = "RL_FUNC_SUBTRACT", value = RL.RL_FUNC_SUBTRACT },
+		{ name = "RL_FUNC_REVERSE_SUBTRACT", value = RL.RL_FUNC_REVERSE_SUBTRACT },
+		{ name = "RL_BLEND_EQUATION", value = RL.RL_BLEND_EQUATION },
+		{ name = "RL_BLEND_EQUATION_RGB", value = RL.RL_BLEND_EQUATION_RGB },
+		{ name = "RL_BLEND_EQUATION_ALPHA", value = RL.RL_BLEND_EQUATION_ALPHA },
+		{ name = "RL_BLEND_DST_RGB", value = RL.RL_BLEND_DST_RGB },
+		{ name = "RL_BLEND_SRC_RGB", value = RL.RL_BLEND_SRC_RGB },
+		{ name = "RL_BLEND_DST_ALPHA", value = RL.RL_BLEND_DST_ALPHA },
+		{ name = "RL_BLEND_SRC_ALPHA", value = RL.RL_BLEND_SRC_ALPHA },
+		{ name = "RL_BLEND_COLOR", value = RL.RL_BLEND_COLOR },
+	}
+}
+
+function RL.init()
+	RL.SetWindowTitle( "Blend modes" )
+	RL.SetWindowState( RL.FLAG_VSYNC_HINT )
+	RL.SetWindowSize( winSize )
+
+	local monitorPos = Vector2:newT( RL.GetMonitorPosition( monitor ) )
+	local monitorSize = Vector2:newT( RL.GetMonitorSize( monitor ) )
+	RL.SetWindowPosition( { monitorPos.x + monitorSize.x / 2 - winSize.x / 2, monitorPos.y + monitorSize.y / 2 - winSize.y / 2 } )
+
+	local path = RL.GetBasePath().."../resources/images/"
+
+	catTex = RL.LoadTexture( path.."cat.png" )
+	RL.SetTextureWrap( catTex, RL.TEXTURE_WRAP_REPEAT )
+
+	tileTex = RL.LoadTexture( path.."tile.png" )
+	RL.SetTextureWrap( tileTex, RL.TEXTURE_WRAP_REPEAT )
+
+	lightTex = RL.LoadTexture( path.."light.png" )
+	lightTexSize:setT( RL.GetTextureSize( lightTex ) )
+
+	framebuffer = RL.LoadRenderTexture( winSize )
+end
+
+function RL.update( delta )
+end
+
+local function drawControl( pos, t, name )
+	if RL.GuiButton( { pos.x, pos.y, buttonSize.x, buttonSize.y }, RL.GuiIconText( RL.ICON_ARROW_LEFT, "" ) ) == 1 then
+		t[ name ] = 1 < t[ name ] and t[ name ] - 1 or #t.options
+	end
+	pos.x = pos.x + buttonSize.x + 2
+
+	if RL.GuiButton( { pos.x, pos.y, buttonSize.x, buttonSize.y }, RL.GuiIconText( RL.ICON_ARROW_RIGHT, "" ) ) == 1 then
+		t[ name ] = t[ name ] < #t.options and t[ name ] + 1 or 1
+	end
+	pos.x = pos.x + buttonSize.x + 2
+
+	RL.DrawText( name..": "..t.options[ t[ name ] ].name, pos, fontSize, textTint )
+
+	pos.x = 2
+	pos.y = pos.y + 2 + buttonSize.y
+end
+
+local function drawControls()
+	local pos = Vector2:new( 2 )
+
+	-- Blend mode.
+	drawControl( pos, blendMode, "mode" )
+	-- Blend RPG.
+	pos.y = pos.y + 8
+	drawControl( pos, blendFactor, "srcRGB" )
+	drawControl( pos, blendFactor, "dstRGB" )
+	drawControl( pos, blendFunction, "eqRGB" )
+	-- Blend Alpha.
+	pos.y = pos.y + 8
+	drawControl( pos, blendFactor, "srcAlpha" )
+	drawControl( pos, blendFactor, "dstAlpha" )
+	drawControl( pos, blendFunction, "eqAlpha" )
+end
+
+function RL.draw()
+	local mousePos = Vector2:newT( RL.GetMousePosition() )
+
+	RL.ClearBackground( RL.BLACK )
+
+	if framebuffer then
+		RL.BeginTextureMode( framebuffer )
+			RL.ClearBackground( RL.BLACK )
+			RL.DrawTexturePro( catTex,
+				{ 0, 0, winSize.x, winSize.y },
+				{ 0, 0, winSize.x, winSize.y },
+				{ 0, 0 },
+				0.0,
+				RL.WHITE
+			)
+			RL.rlSetBlendFactors(
+				blendFactor.options[ blendFactor.srcRGB ].value,
+				blendFactor.options[ blendFactor.dstRGB ].value,
+				blendFunction.options[ blendFunction.eqRGB ].value
+			)
+			RL.rlSetBlendFactorsSeparate(
+				blendFactor.options[ blendFactor.srcRGB ].value,
+				blendFactor.options[ blendFactor.dstRGB ].value,
+				blendFactor.options[ blendFactor.srcAlpha ].value,
+				blendFactor.options[ blendFactor.dstAlpha ].value,
+				blendFunction.options[ blendFunction.eqRGB ].value,
+				blendFunction.options[ blendFunction.eqAlpha ].value
+			)
+			RL.BeginBlendMode( blendMode.options[ blendMode.mode ].value )
+				RL.DrawTexture( lightTex, mousePos - lightTexSize:scale( 0.5 ), RL.WHITE )
+			RL.EndBlendMode()
+		RL.EndTextureMode()
+	end
+
+	RL.DrawTexturePro( tileTex,
+		{ 0, 0, winSize.x, winSize.y },
+		{ 0, 0, winSize.x, winSize.y },
+		{ 0, 0 },
+		0.0,
+		RL.WHITE
+	)
+
+	RL.DrawTexturePro(
+		RL.GetRenderTextureTexture( framebuffer ),
+		{ 0, 0, winSize.x, -winSize.y },
+		{ 0, 0, winSize.x, winSize.y },
+		{ 0, 0 },
+		0.0,
+		RL.WHITE
+	)
+	RL.DrawRectangle( { 0, 0, 550, 180 }, { 255, 255, 255, 200 } )
+	drawControls()
+end
diff --git a/src/models.c b/src/models.c
index 45bb825..cd58e4e 100644
--- a/src/models.c
+++ b/src/models.c
@@ -354,8 +354,6 @@ int lmodelDrawQuad3DTexture( lua_State* L ) {
 		lua_pop( L, 1 );
 	}
 
-	//TODO Normals. maybe something like Vector3Normalize(Vector3CrossProduct(Vector3Subtract(vB, vA), Vector3Subtract(vC, vA)));
-
 	/* Draw. */
 	rlCheckRenderBatchLimit( 4 );
 	rlSetTexture( texture->id );
@@ -2531,12 +2529,11 @@ int lmodelsGetRayBoxCells( lua_State* L ) {
 	Vector3 cellSize = uluaGetVector3( L, 3 );
 
 	/* To avoid possible div by 0 later. */
-	ray.direction.x == 0.0f ? EPSILON : ray.direction.x;
-	ray.direction.y == 0.0f ? EPSILON : ray.direction.y;
-	ray.direction.z == 0.0f ? EPSILON : ray.direction.z;
+	ray.direction.x = ray.direction.x == 0.0f ? EPSILON : ray.direction.x;
+	ray.direction.y = ray.direction.y == 0.0f ? EPSILON : ray.direction.y;
+	ray.direction.z = ray.direction.z == 0.0f ? EPSILON : ray.direction.z;
 
 	Vector3 boxSize = Vector3Subtract( box.max, box.min );
-	// Vector3 boxSizeCells = Vector3Ceil( Vector3Divide( boxSize, cellSize ) );
 	Vector3 cellPos = { -1.0f, -1.0f, -1.0f };
 	Vector3 localRayPos = { 0.0f, 0.0f, 0.0f };