From bd8c5ed59a705619ea72363e06c5c5d6ab5547a5 Mon Sep 17 00:00:00 2001
From: milek7 <me@milek7.pl>
Date: Sun, 9 Dec 2018 19:55:53 +0100
Subject: [PATCH] debug configurable headlight

---
 gl/glsl_common.cpp        |  1 +
 gl/ubo.h                  |  3 ++-
 renderer.cpp              | 21 +++++++++++++++++----
 renderer.h                |  2 ++
 shaders/light_common.glsl |  3 ++-
 5 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/gl/glsl_common.cpp b/gl/glsl_common.cpp
index a65931c6..c818dc1d 100644
--- a/gl/glsl_common.cpp
+++ b/gl/glsl_common.cpp
@@ -31,6 +31,7 @@ void gl::glsl_common_setup()
 
             float linear;
             float quadratic;
+	        float ambient;
     };
 
     layout(std140) uniform light_ubo
diff --git a/gl/ubo.h b/gl/ubo.h
index 690f7c3e..eb95c379 100644
--- a/gl/ubo.h
+++ b/gl/ubo.h
@@ -88,7 +88,8 @@ namespace gl
         float linear;
         float quadratic;
 
-        UBS_PAD(8);
+		float ambient;
+		UBS_PAD(4);
     };
 
     static_assert(sizeof(light_element_ubs) == 64, "bad size of ubs");
diff --git a/renderer.cpp b/renderer.cpp
index 5e6c8b5a..6f1933ff 100644
--- a/renderer.cpp
+++ b/renderer.cpp
@@ -633,6 +633,17 @@ void opengl_renderer::Render_pass(rendermode const Mode)
 		if (!Global.gfx_usegles && !Global.gfx_shadergamma)
 			glDisable(GL_FRAMEBUFFER_SRGB);
 
+		if (DebugModeFlag)
+		{
+			ImGui::Begin("light conf");
+			ImGui::SliderFloat("in_cutoff", &in_cutoff, 0.9f, 1.1f);
+			ImGui::SliderFloat("out_cutoff", &out_cutoff, 0.9f, 1.1f);
+			ImGui::SliderFloat("linear", &linear, 0.0f, 1.0f, "%.3f", 2.0f);
+			ImGui::SliderFloat("quadratic", &quadratic, 0.0f, 1.0f, "%.3f", 2.0f);
+			ImGui::SliderFloat("ambient", &ambient, 0.0f, 1.0f);
+			ImGui::End();
+		}
+
 		glDebug("uilayer render");
 		Application.render_ui();
 
@@ -3700,11 +3711,12 @@ void opengl_renderer::Update_Lights(light_array &Lights)
 		l->pos = mv * glm::vec4(renderlight->position, 1.0f);
 		l->dir = mv * glm::vec4(renderlight->direction, 0.0f);
 		l->type = gl::light_element_ubs::SPOT;
-		l->in_cutoff = 0.997f;
-		l->out_cutoff = 0.99f;
+		l->in_cutoff = in_cutoff;
+		l->out_cutoff = out_cutoff;
 		l->color = renderlight->diffuse * renderlight->factor;
-		l->linear = 0.007f;
-		l->quadratic = 0.0002f;
+		l->linear = linear / 10.0f;
+		l->quadratic = quadratic / 100.0f;
+		l->ambient = ambient;
 		light_i++;
 
 		++renderlight;
@@ -3714,6 +3726,7 @@ void opengl_renderer::Update_Lights(light_array &Lights)
 	light_ubs.lights[0].type = gl::light_element_ubs::DIR;
 	light_ubs.lights[0].dir = mv * glm::vec4(m_sunlight.direction, 0.0f);
 	light_ubs.lights[0].color = m_sunlight.diffuse * m_sunlight.factor;
+	light_ubs.lights[0].ambient = 0.0f;
 	light_ubs.lights_count = light_i;
 
 	light_ubs.fog_color = Global.FogColor;
diff --git a/renderer.h b/renderer.h
index 2a42624b..85bb2963 100644
--- a/renderer.h
+++ b/renderer.h
@@ -411,6 +411,8 @@ class opengl_renderer
     bool m_blendingenabled;
 
 	bool m_widelines_supported;
+
+	float in_cutoff=0.997f, out_cutoff=0.99f, linear=0.07f, quadratic=0.02f, ambient=0.25f;
 };
 
 extern opengl_renderer GfxRenderer;
diff --git a/shaders/light_common.glsl b/shaders/light_common.glsl
index 2f68bbee..d70a5c67 100644
--- a/shaders/light_common.glsl
+++ b/shaders/light_common.glsl
@@ -44,7 +44,7 @@ vec2 calc_light(vec3 light_dir)
 #endif
 	vec3 view_dir = normalize(vec3(0.0f, 0.0f, 0.0f) - f_pos.xyz);
 	vec3 halfway_dir = normalize(light_dir + view_dir);
-	
+
 	float diffuse_v = max(dot(normal, light_dir), 0.0);
 	float specular_v = pow(max(dot(normal, halfway_dir), 0.0), 15.0);
 
@@ -55,6 +55,7 @@ vec2 calc_point_light(light_s light)
 {
 	vec3 light_dir = normalize(light.pos - f_pos.xyz);
 	vec2 val = calc_light(light_dir);
+	val.x += light.ambient;
 	
 	float distance = length(light.pos - f_pos.xyz);
 	float atten = 1.0f / (1.0f + light.linear * distance + light.quadratic * (distance * distance));