From 194400e1af31e0baba5c7cbc5809e91b0e06d30b Mon Sep 17 00:00:00 2001
From: tmj-fstate <dyvach@yahoo.com>
Date: Fri, 29 Nov 2019 16:20:21 +0100
Subject: [PATCH] inversed view transform uniform

---
 gl/glsl_common.cpp   | 1 +
 gl/ubo.h             | 3 ++-
 opengl33renderer.cpp | 4 ++--
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/gl/glsl_common.cpp b/gl/glsl_common.cpp
index 299b3a12..14d2697a 100644
--- a/gl/glsl_common.cpp
+++ b/gl/glsl_common.cpp
@@ -65,6 +65,7 @@ void gl::glsl_common_setup()
     {
         mat4 projection;
         mat4 lightview;
+        mat4 inv_view;
 	    vec3 scene_extra;
         float time;
     };
diff --git a/gl/ubo.h b/gl/ubo.h
index cd29cfb3..473c4d28 100644
--- a/gl/ubo.h
+++ b/gl/ubo.h
@@ -37,11 +37,12 @@ namespace gl
     {
         glm::mat4 projection;
         glm::mat4 lightview;
+        glm::mat4 inv_view;
 		glm::vec3 scene_extra;
         float time;
     };
 
-    static_assert(sizeof(scene_ubs) == 144, "bad size of ubs");
+    static_assert(sizeof(scene_ubs) == 208, "bad size of ubs");
 
     const size_t MAX_PARAMS = 3;
 
diff --git a/opengl33renderer.cpp b/opengl33renderer.cpp
index c7e659eb..08c39c68 100644
--- a/opengl33renderer.cpp
+++ b/opengl33renderer.cpp
@@ -555,7 +555,8 @@ void opengl33_renderer::Render_pass(viewport_config &vp, rendermode const Mode)
 
 		scene_ubs.time = Timer::GetTime();
 		scene_ubs.projection = OpenGLMatrices.data(GL_PROJECTION);
-		scene_ubo->update(scene_ubs);
+        scene_ubs.inv_view = glm::inverse( glm::mat4{ glm::mat3{ m_renderpass.pass_camera.modelview() } } );
+        scene_ubo->update(scene_ubs);
 		scene_ubo->bind_uniform();
 
 		m_colorpass = m_renderpass;
@@ -1309,7 +1310,6 @@ void opengl33_renderer::setup_matrices()
 {
     OpenGLMatrices.mode(GL_PROJECTION);
 	OpenGLMatrices.load_matrix(m_renderpass.pass_camera.projection());
-
 	// trim modelview matrix just to rotation, since rendering is done in camera-centric world space
     OpenGLMatrices.mode(GL_MODELVIEW);
 	OpenGLMatrices.load_matrix(glm::mat4(glm::mat3(m_renderpass.pass_camera.modelview())));