Improve headlights, fix z fighting

assets/shaders/light_ps.glsl

@@ -18,5 +18,5 @@ out vec4 finalColor;
 
 void main()
 {
-    finalColor = colDiffuse*fragColor;
+    finalColor = vec4(colDiffuse.rgb, colDiffuse.a * fragColor.x);
 }

game/game.odin

@@ -822,7 +822,11 @@ draw :: proc() {
 
 			render.draw_model(car_model, basic_shader.shader, car_matrix)
 
-      render.draw_mesh_light(assets.get_model(&g_mem.assetman, "assets/ae86_lights.glb"), car_matrix, rl.Color{255, 255, 255, 100})
+			render.draw_mesh_light(
+				assets.get_model(&g_mem.assetman, "assets/ae86_lights.glb"),
+				car_matrix,
+				rl.Color{255, 255, 255, 100},
+			)
 		}
 
 		{
@@ -984,11 +988,7 @@ draw :: proc() {
 
 				new_point_pos := points[0] - tangent * 4
 
-				if (spline_handle(
-						   new_point_pos,
-						   camera,
-						   false,
-					   )) {
+				if (spline_handle(new_point_pos, camera, false)) {
 					inject_at(&world.track.points, 0, new_point_pos)
 					log.debugf("add point before 0")
 				}
@@ -1006,11 +1006,7 @@ draw :: proc() {
 
 				new_point_pos := points[points_len - 1] + tangent * 4
 
-				if (spline_handle(
-						   new_point_pos,
-						   camera,
-						   false,
-					   )) {
+				if (spline_handle(new_point_pos, camera, false)) {
 					inject_at(&world.track.points, points_len - 1 + 1, new_point_pos)
 					log.debugf("add point before 0")
 				}
@@ -1111,8 +1107,6 @@ game_init_window :: proc(args: []string) {
 
 	init_physfs(args)
 
-	render.init()
-
 	rl.SetConfigFlags({.WINDOW_RESIZABLE, .VSYNC_HINT})
 	rl.InitWindow(1280, 720, "Odin + Raylib + Hot Reload template!")
 	rl.SetExitKey(.KEY_NULL)
@@ -1172,7 +1166,7 @@ game_memory_size :: proc() -> int {
 game_hot_reloaded :: proc(mem: rawptr) {
 	g_mem = (^Game_Memory)(mem)
 
-	render.init()
+	render.init(&g_mem.assetman)
 
 	g_mem.runtime_world.orbit_camera.distance = 4
 }

game/render/render.odin

@@ -1,36 +1,49 @@
 package render
 
+import "game:assets"
 import rl "libs:raylib"
 import rlgl "libs:raylib/rlgl"
 import gl "vendor:OpenGL"
 
+@(private = "file")
+assetman: ^assets.Asset_Manager
+
 // Used by vendor:OpenGL
 rlgl_set_proc_address :: proc(p: rawptr, name: cstring) {
 	(^rawptr)(p)^ = rl.GetGLProcAddress(name)
 }
 
-init :: proc() {
+init :: proc(in_assetman: ^assets.Asset_Manager) {
+	assetman = in_assetman
 	gl.load_up_to(3, 3, rlgl_set_proc_address)
+	rlgl.SetClipPlanes(0.1, 10000)
 }
 
 clear_stencil :: proc() {
 	gl.Clear(gl.STENCIL_BUFFER_BIT)
 }
 
-draw_model :: proc(model: rl.Model, shader: rl.Shader, transform: rl.Matrix) {
+draw_model :: proc(
+	model: rl.Model,
+	shader: rl.Shader,
+	transform: rl.Matrix,
+	color: rl.Color = rl.WHITE,
+) {
 	model := model
 	for i in 0 ..< model.materialCount {
 		model.materials[i].shader = shader
 	}
 	model.transform = transform
 
-	rl.DrawModel(model, rl.Vector3{}, 1, rl.WHITE)
+	rl.DrawModel(model, rl.Vector3{}, 1, color)
 }
 
 draw_mesh_light :: proc(model: rl.Model, transform: rl.Matrix, color: rl.Color) {
 	model := model
 	model.transform = transform
 
+	light_shader := assets.get_shader(assetman, nil, "assets/shaders/light_ps.glsl", {}).shader
+
 	rlgl.DrawRenderBatchActive()
 
 	gl.Enable(gl.STENCIL_TEST)
@@ -43,30 +56,34 @@ draw_mesh_light :: proc(model: rl.Model, transform: rl.Matrix, color: rl.Color)
 		gl.ColorMask(false, false, false, false)
 		rlgl.SetCullFace(.FRONT)
 
-    rl.DrawModel(model, {}, 1, color)
+		draw_model(model, light_shader, transform, color)
 		rlgl.DrawRenderBatchActive()
 	}
 
+	// Draw outside light
 	{
 		gl.StencilFunc(gl.EQUAL, 1, ~u32(0))
-    gl.StencilOp(gl.ZERO, gl.ZERO, gl.ZERO)
+		gl.StencilOp(gl.KEEP, gl.ZERO, gl.ZERO)
 		gl.DepthFunc(gl.LEQUAL)
 		gl.ColorMask(true, true, true, true)
 		rlgl.SetCullFace(.BACK)
 
-    rl.DrawModel(model, {}, 1, color)
+		draw_model(model, light_shader, transform, color)
 		rlgl.DrawRenderBatchActive()
 	}
 
-  {
+	// Light when camera is inside
+	if true {
 		gl.StencilOp(gl.KEEP, gl.KEEP, gl.ZERO)
 		gl.DepthFunc(gl.GREATER)
 		rlgl.SetCullFace(.FRONT)
 
-    rl.DrawModel(model, {}, 1, color)
+		draw_model(model, light_shader, transform, color)
 		rlgl.DrawRenderBatchActive()
 	}
 
+	gl.Clear(gl.STENCIL_BUFFER_BIT)
+
 	gl.StencilFunc(gl.ALWAYS, 0, ~u32(0))
 	gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
 	rlgl.SetCullFace(.BACK)

libs/raylib/rlgl/rlgl.odin

@@ -125,8 +125,7 @@ when ODIN_OS == .Windows {
 } else when ODIN_OS == .Linux {
 	foreign import lib {// Note(bumbread): I'm not sure why in `linux/` folder there are
 	// multiple copies of raylib.so, but since these bindings are for
-	// particular version of the library, I better specify it. Ideally,
-	"../src/libraylib.so.550" when RAYLIB_SHARED else "../src/libraylib.a", "system:dl", "system:pthread"}// though, it's best specified in terms of major (.so.4)
+	"../src/libraylib.so.550" when RAYLIB_SHARED else "../src/libraylib.a", "system:dl", "system:pthread"} // particular version of the library, I better specify it. Ideally,// though, it's best specified in terms of major (.so.4)
 } else when ODIN_OS == .Darwin {
 	foreign import lib {"../macos" + ("-arm64" when ODIN_ARCH ==
 			.arm64 else "") + "/libraylib" + (".500.dylib" when RAYLIB_SHARED else ".a"), "system:Cocoa.framework", "system:OpenGL.framework", "system:IOKit.framework"}
@@ -364,6 +363,7 @@ foreign lib {
 	Frustum :: proc(left, right, bottom, top, znear, zfar: f64) ---
 	Ortho :: proc(left, right, bottom, top, znear, zfar: f64) ---
 	Viewport :: proc(x, y, width, height: c.int) --- // Set the viewport area
+	SetClipPlanes :: proc(nearPlane, farPlane: f64) --- // Set clip planes
 
 	//------------------------------------------------------------------------------------
 	// Functions Declaration - Vertex level operations