From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 7 Apr 2021 23:00:51 +0000 (+0300)
Subject: Add a separate constant to enable clipping in standard shaders
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=594f5277e988a5a7b3b4ae381993da68ed733733

Add a separate constant to enable clipping in standard shaders

Declaring an array with zero size is not allowed, so using zero for
max_clip_planes doesn't work.
---

diff --git a/shaderlib/common.glsl b/shaderlib/common.glsl
index f952c8bd..849d97c9 100644
--- a/shaderlib/common.glsl
+++ b/shaderlib/common.glsl
@@ -54,8 +54,11 @@ void standard_transform()
 	out vec3 tbn_zenith_dir = eye_zenith_dir*eye_tbn_matrix;
 	out float fog_coord = eye_vertex.z;
 
-	for(int i=0; i<max_clip_planes; ++i)
-		gl_ClipDistance[i] = dot(eye_vertex, clip_planes[i].equation);
+	if(use_clipping)
+	{
+		for(int i=0; i<max_clip_planes; ++i)
+			gl_ClipDistance[i] = dot(eye_vertex, clip_planes[i].equation);
+	}
 
 	shadow_transform(eye_vertex);
 }
diff --git a/shaderlib/msp_interface.glsl b/shaderlib/msp_interface.glsl
index 2458b97d..b86d09bb 100644
--- a/shaderlib/msp_interface.glsl
+++ b/shaderlib/msp_interface.glsl
@@ -30,7 +30,8 @@ uniform Lighting
 	float fog_density;
 };
 
-layout(constant_id=auto) const int max_clip_planes = 0;
+layout(constant_id=auto) const bool use_clipping = false;
+layout(constant_id=auto) const int max_clip_planes = 8;
 uniform Clipping
 {
 	ClipPlane clip_planes[max_clip_planes];