From 607c0979bbc9405a724c6ff288659afe7540979a Mon Sep 17 00:00:00 2001
From: Tim McCabe <me@timmcca.be>
Date: Fri, 22 Sep 2023 10:38:37 -0400
Subject: [PATCH] Add BACKGROUND_INTENSITY to gbc-color

---
 .../shaders/simpletex_lcd/simpletex_lcd+gbc-color.slang    | 7 ++++++-
 handheld/simpletex_lcd+gbc-color.slangp                    | 3 ++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/handheld/shaders/simpletex_lcd/simpletex_lcd+gbc-color.slang b/handheld/shaders/simpletex_lcd/simpletex_lcd+gbc-color.slang
index 7492cda9..ad178a3b 100644
--- a/handheld/shaders/simpletex_lcd/simpletex_lcd+gbc-color.slang
+++ b/handheld/shaders/simpletex_lcd/simpletex_lcd+gbc-color.slang
@@ -40,6 +40,9 @@
 	  > DARKEN_COLOUR: Simply darkens pixel colours (effectively lowers gamma level of pixels)
 	                   - 0.0: Colours are normal
 	                   - 2.0: Colours are too dark...
+	  > BACKGROUND_INTENSITY: Adjusts how prominent the paper background texture is
+	                          - 0.0: No background texture
+	                          - 1.0: Background texture is clearly visible
 	
 	This program is free software; you can redistribute it and/or modify it
 	under the terms of the GNU General Public License as published by the Free
@@ -59,6 +62,7 @@
 #pragma parameter GRID_BIAS "Grid Bias" 0.0 0.0 1.0 0.05
 #pragma parameter DARKEN_GRID "Darken Grid" 0.0 0.0 1.0 0.05
 #pragma parameter DARKEN_COLOUR "Darken Colours" 0.0 0.0 2.0 0.05
+#pragma parameter BACKGROUND_INTENSITY "Background Intensity" 1.0 0.0 1.0 0.05
 
 layout(push_constant) uniform Push
 {
@@ -67,6 +71,7 @@ layout(push_constant) uniform Push
 	float GRID_BIAS;
 	float DARKEN_GRID;
 	float DARKEN_COLOUR;
+	float BACKGROUND_INTENSITY;
 	vec4 OutputSize;
 	vec4 OriginalSize;
 	vec4 SourceSize;
@@ -203,7 +208,7 @@ void main()
 	// Note: Have to calculate luminosity a second time... tiresome, but
 	// it's not a particulary expensive operation...
 	luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
-	colour.rgb = mix(colour.rgb, bgTexture.rgb, luma);
+	colour.rgb = mix(colour.rgb, bgTexture.rgb, luma * registers.BACKGROUND_INTENSITY);
 	
 	FragColor = vec4(colour.rgb, 1.0);
 }
diff --git a/handheld/simpletex_lcd+gbc-color.slangp b/handheld/simpletex_lcd+gbc-color.slangp
index 6a859c3b..d55f03b3 100644
--- a/handheld/simpletex_lcd+gbc-color.slangp
+++ b/handheld/simpletex_lcd+gbc-color.slangp
@@ -14,9 +14,10 @@ textures = "BACKGROUND"
 BACKGROUND = "shaders/simpletex_lcd/png/2k/textured_paper.png"
 BACKGROUND_linear = false
 
-parameters = "GRID_INTENSITY;GRID_WIDTH;GRID_BIAS;DARKEN_GRID;DARKEN_COLOUR"
+parameters = "GRID_INTENSITY;GRID_WIDTH;GRID_BIAS;DARKEN_GRID;DARKEN_COLOUR;BACKGROUND_INTENSITY"
 GRID_INTENSITY = "0.65"
 GRID_WIDTH = "0.65"
 GRID_BIAS = "0.6"
 DARKEN_GRID = "0.0"
 DARKEN_COLOUR = "0.05"
+BACKGROUND_INTENSITY = "1.0"