Multi stage glow with light bleeding from HDR

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/gles3/shaders/effect_blur.glsl b/drivers/gles3/shaders/effect_blur.glsl
index 211b60ca2e..589af64d44 100644
--- a/drivers/gles3/shaders/effect_blur.glsl
+++ b/drivers/gles3/shaders/effect_blur.glsl
@@ -35,6 +35,31 @@ uniform vec4 ssao_color;
 
 #endif
 
+#if defined (GLOW_GAUSSIAN_HORIZONTAL) || defined(GLOW_GAUSSIAN_VERTICAL)
+
+uniform float glow_strength;
+
+#endif
+
+
+#ifdef GLOW_FIRST_PASS
+
+uniform float exposure;
+uniform float white;
+
+#ifdef GLOW_USE_AUTO_EXPOSURE
+
+uniform highp sampler2D source_auto_exposure; //texunit:1
+uniform highp float auto_exposure_grey;
+
+#endif
+
+uniform float glow_bloom;
+uniform float glow_hdr_treshold;
+uniform float glow_hdr_scale;
+
+#endif
+
 void main() {
 
 
@@ -57,6 +82,48 @@ void main() {
 	frag_color = color;
 #endif
 
+
+
+#ifdef GLOW_GAUSSIAN_HORIZONTAL
+	vec4 color =textureLod( source_color,  uv_interp+vec2( 0.0, 0.0)*pixel_size,lod )*0.174938;
+	color+=textureLod( source_color,  uv_interp+vec2( 1.0, 0.0)*pixel_size,lod )*0.165569;
+	color+=textureLod( source_color,  uv_interp+vec2( 2.0, 0.0)*pixel_size,lod )*0.140367;
+	color+=textureLod( source_color,  uv_interp+vec2( 3.0, 0.0)*pixel_size,lod )*0.106595;
+	color+=textureLod( source_color,  uv_interp+vec2(-1.0, 0.0)*pixel_size,lod )*0.165569;
+	color+=textureLod( source_color,  uv_interp+vec2(-2.0, 0.0)*pixel_size,lod )*0.140367;
+	color+=textureLod( source_color,  uv_interp+vec2(-3.0, 0.0)*pixel_size,lod )*0.165569;
+	color*=glow_strength;
+	frag_color = color;
+#endif
+
+#ifdef GLOW_GAUSSIAN_VERTICAL
+	vec4 color =textureLod( source_color,  uv_interp+vec2(0.0, 0.0)*pixel_size,lod )*0.174938;
+	color+=textureLod( source_color,  uv_interp+vec2(0.0, 1.0)*pixel_size,lod )*0.165569;
+	color+=textureLod( source_color,  uv_interp+vec2(0.0, 2.0)*pixel_size,lod )*0.140367;
+	color+=textureLod( source_color,  uv_interp+vec2(0.0, 3.0)*pixel_size,lod )*0.106595;
+	color+=textureLod( source_color,  uv_interp+vec2(0.0,-1.0)*pixel_size,lod )*0.165569;
+	color+=textureLod( source_color,  uv_interp+vec2(0.0,-2.0)*pixel_size,lod )*0.140367;
+	color+=textureLod( source_color,  uv_interp+vec2(0.0,-3.0)*pixel_size,lod )*0.165569;
+	color*=glow_strength;
+	frag_color = color;
+#endif
+
+#ifdef GLOW_FIRST_PASS
+
+#ifdef GLOW_USE_AUTO_EXPOSURE
+
+	frag_color/=texelFetch(source_auto_exposure,ivec2(0,0),0).r/auto_exposure_grey;
+#endif
+	frag_color*=exposure;
+
+	float luminance = max(frag_color.r,max(frag_color.g,frag_color.b));
+	float feedback = max( smoothstep(glow_hdr_treshold,glow_hdr_treshold+glow_hdr_scale,luminance), glow_bloom );
+
+	frag_color *= feedback;
+
+#endif
+
+
 #ifdef SIMPLE_COPY
 	vec4 color =textureLod( source_color,  uv_interp,0.0);
 	frag_color = color;