From 21ac6d7d8e704eb5e624a17b8e3991d63c22e4a9 Mon Sep 17 00:00:00 2001
From: clayjohn <claynjohn@gmail.com>
Date: Thu, 17 Nov 2022 12:36:47 -0800
Subject: Finish implementing Canvas Background mode

---
 .../renderer_rd/shaders/effects/copy_to_fb.glsl    | 55 +++++++++++++---------
 1 file changed, 34 insertions(+), 21 deletions(-)

(limited to 'servers/rendering/renderer_rd/shaders')

diff --git a/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl b/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl
index 4d4e983b7f..46bb99794d 100644
--- a/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl
+++ b/servers/rendering/renderer_rd/shaders/effects/copy_to_fb.glsl
@@ -13,6 +13,14 @@
 #endif // has_VK_KHR_multiview
 #endif //MULTIVIEW
 
+#define FLAG_FLIP_Y (1 << 0)
+#define FLAG_USE_SECTION (1 << 1)
+#define FLAG_FORCE_LUMINANCE (1 << 2)
+#define FLAG_ALPHA_TO_ZERO (1 << 3)
+#define FLAG_SRGB (1 << 4)
+#define FLAG_ALPHA_TO_ONE (1 << 5)
+#define FLAG_LINEAR (1 << 6)
+
 #ifdef MULTIVIEW
 layout(location = 0) out vec3 uv_interp;
 #else
@@ -22,13 +30,8 @@ layout(location = 0) out vec2 uv_interp;
 layout(push_constant, std430) uniform Params {
 	vec4 section;
 	vec2 pixel_size;
-	bool flip_y;
-	bool use_section;
-
-	bool force_luminance;
-	bool alpha_to_zero;
-	bool srgb;
-	bool alpha_to_one;
+	float luminance_multiplier;
+	uint flags;
 
 	vec4 color;
 }
@@ -41,13 +44,13 @@ void main() {
 	uv_interp.z = ViewIndex;
 #endif
 	vec2 vpos = uv_interp.xy;
-	if (params.use_section) {
+	if (bool(params.flags & FLAG_USE_SECTION)) {
 		vpos = params.section.xy + vpos * params.section.zw;
 	}
 
 	gl_Position = vec4(vpos * 2.0 - 1.0, 0.0, 1.0);
 
-	if (params.flip_y) {
+	if (bool(params.flags & FLAG_FLIP_Y)) {
 		uv_interp.y = 1.0 - uv_interp.y;
 	}
 }
@@ -67,16 +70,19 @@ void main() {
 #endif // has_VK_KHR_multiview
 #endif //MULTIVIEW
 
+#define FLAG_FLIP_Y (1 << 0)
+#define FLAG_USE_SECTION (1 << 1)
+#define FLAG_FORCE_LUMINANCE (1 << 2)
+#define FLAG_ALPHA_TO_ZERO (1 << 3)
+#define FLAG_SRGB (1 << 4)
+#define FLAG_ALPHA_TO_ONE (1 << 5)
+#define FLAG_LINEAR (1 << 6)
+
 layout(push_constant, std430) uniform Params {
 	vec4 section;
 	vec2 pixel_size;
-	bool flip_y;
-	bool use_section;
-
-	bool force_luminance;
-	bool alpha_to_zero;
-	bool srgb;
-	bool alpha_to_one;
+	float luminance_multiplier;
+	uint flags;
 
 	vec4 color;
 }
@@ -110,6 +116,10 @@ vec3 linear_to_srgb(vec3 color) {
 	return mix((vec3(1.0f) + a) * pow(color.rgb, vec3(1.0f / 2.4f)) - a, 12.92f * color.rgb, lessThan(color.rgb, vec3(0.0031308f)));
 }
 
+vec3 srgb_to_linear(vec3 color) {
+	return mix(pow((color.rgb + vec3(0.055)) * (1.0 / (1.0 + 0.055)), vec3(2.4)), color.rgb * (1.0 / 12.92), lessThan(color.rgb, vec3(0.04045)));
+}
+
 void main() {
 #ifdef MODE_SET_COLOR
 	frag_color = params.color;
@@ -165,19 +175,22 @@ void main() {
 #endif /* MODE_TWO_SOURCES */
 #endif /* MULTIVIEW */
 
-	if (params.force_luminance) {
+	if (bool(params.flags & FLAG_FORCE_LUMINANCE)) {
 		color.rgb = vec3(max(max(color.r, color.g), color.b));
 	}
-	if (params.alpha_to_zero) {
+	if (bool(params.flags & FLAG_ALPHA_TO_ZERO)) {
 		color.rgb *= color.a;
 	}
-	if (params.srgb) {
+	if (bool(params.flags & FLAG_SRGB)) {
 		color.rgb = linear_to_srgb(color.rgb);
 	}
-	if (params.alpha_to_one) {
+	if (bool(params.flags & FLAG_ALPHA_TO_ONE)) {
 		color.a = 1.0;
 	}
+	if (bool(params.flags & FLAG_LINEAR)) {
+		color.rgb = srgb_to_linear(color.rgb);
+	}
 
-	frag_color = color;
+	frag_color = color / params.luminance_multiplier;
 #endif // MODE_SET_COLOR
 }
-- 
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