From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 9 Oct 2021 09:52:29 +0000 (+0300)
Subject: Add an option to use a fixed position in EnvironmentMap
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=3867df2040d1fb955158ca3bd8fbf5271ad66fb2

Add an option to use a fixed position in EnvironmentMap

This allows environment maps which are not tied to a particular object.

It's required for 0b76663 but I forgot to commit it before that.
---

diff --git a/source/effects/environmentmap.cpp b/source/effects/environmentmap.cpp
index 315390b1..47cea090 100644
--- a/source/effects/environmentmap.cpp
+++ b/source/effects/environmentmap.cpp
@@ -79,6 +79,12 @@ EnvironmentMap::EnvironmentMap(unsigned s, PixelFormat f, unsigned l, Renderable
 	shdata.uniform("env_world_matrix", LinAl::SquareMatrix<float, 3>::identity());
 }
 
+void EnvironmentMap::set_fixed_position(const Vector3 &p)
+{
+	fixed_position = p;
+	use_fixed_pos = true;
+}
+
 void EnvironmentMap::set_depth_clip(float n, float f)
 {
 	for(unsigned i=0; i<6; ++i)
@@ -113,16 +119,22 @@ void EnvironmentMap::setup_frame(Renderer &renderer)
 	update_delay = update_interval-1;
 	environment.setup_frame(renderer);
 
-	const Matrix *matrix = renderable.get_matrix();
-	if(!matrix)
-		return;
+	Vector3 center;
+	if(use_fixed_pos)
+		center = fixed_position;
+	else
+	{
+		const Matrix *matrix = renderable.get_matrix();
+		if(!matrix)
+			return;
+
+		center = matrix->column(3).slice<3>(0);
+	}
 
 	Renderer::Push push(renderer);
 	Renderer::Exclude exclude1(renderer, renderable);
 	Renderer::Exclude exclude2(renderer, *this);
 
-	Vector3 center = matrix->column(3).slice<3>(0);
-
 	for(unsigned i=0; i<6; ++i)
 	{
 		faces[i].camera.set_position(center);
diff --git a/source/effects/environmentmap.h b/source/effects/environmentmap.h
index bf6fbaf0..2d27ee7d 100644
--- a/source/effects/environmentmap.h
+++ b/source/effects/environmentmap.h
@@ -38,6 +38,8 @@ private:
 	TextureCube env_tex;
 	Texture2D depth_buf;
 	Face faces[6];
+	Vector3 fixed_position;
+	bool use_fixed_pos = false;
 
 	TextureCube irradiance;
 	const Program &irradiance_shprog;
@@ -58,6 +60,8 @@ public:
 	EnvironmentMap(unsigned size, PixelFormat, Renderable &rend, Renderable &env);
 	EnvironmentMap(unsigned size, PixelFormat, unsigned, Renderable &rend, Renderable &env);
 
+	void set_fixed_position(const Vector3 &);
+
 	void set_depth_clip(float, float);
 
 	/** Sets the interval in frames between environment map updates.  A value of