1 files changed, 98 insertions, 0 deletions
diff --git a/source/blender/draw/engines/gpencil/shaders/fx/gpencil_fx_rim_resolve_frag.glsl b/source/blender/draw/engines/gpencil/shaders/fx/gpencil_fx_rim_resolve_frag.glsl
new file mode 100644
index 00000000000..0a7eb65d564
--- /dev/null
+++ b/source/blender/draw/engines/gpencil/shaders/fx/gpencil_fx_rim_resolve_frag.glsl
@@ -0,0 +1,98 @@
+/* ******************************************************************* */
+/* Resolve RIM pass and add blur if needed                                 */
+/* ******************************************************************* */
+uniform sampler2D strokeColor;
+uniform sampler2D strokeDepth;
+uniform sampler2D strokeRim;
+
+uniform vec3 mask_color;
+uniform int mode;
+
+out vec4 FragColor;
+
+#define MODE_NORMAL   0
+#define MODE_OVERLAY  1
+#define MODE_ADD      2
+#define MODE_SUB      3
+#define MODE_MULTIPLY 4
+#define MODE_DIVIDE   5
+
+float overlay_color(float a, float b)
+{
+	float rtn;
+		if (a < 0.5) {
+			rtn = 2.0 * a * b;
+		}
+		else {
+			rtn = 1.0 - 2.0 * (1.0 - a) * (1.0 - b);
+		}
+
+	return rtn;
+}
+
+vec4 get_blend_color(int mode, vec4 src_color, vec4 mix_color)
+{
+	vec4 outcolor;
+	if (mode == MODE_NORMAL) {
+		outcolor = mix_color;
+	}
+	else if (mode == MODE_OVERLAY) {
+		outcolor.r = overlay_color(src_color.r, mix_color.r);
+		outcolor.g = overlay_color(src_color.g, mix_color.g);
+		outcolor.b = overlay_color(src_color.b, mix_color.b);
+	}
+	else if (mode == MODE_ADD){
+		outcolor = src_color + mix_color;
+	}
+	else if (mode == MODE_SUB){
+		outcolor = src_color - mix_color;
+	}
+	else if (mode == MODE_MULTIPLY)	{
+		outcolor = src_color * mix_color;
+	}
+	else if (mode == MODE_DIVIDE) {
+		outcolor = src_color / mix_color;
+	}
+	else {
+		outcolor = mix_color;
+	}
+
+	/* use always the alpha of source color */
+
+	outcolor.a = src_color.a;
+	/* use alpha to calculate the weight of the mixed color */
+	outcolor = mix(src_color, outcolor, mix_color.a);
+
+	return outcolor;
+}
+
+void main()
+{
+	ivec2 uv = ivec2(gl_FragCoord.xy);
+
+	float stroke_depth = texelFetch(strokeDepth, uv.xy, 0).r;
+	vec4 src_pixel= texelFetch(strokeColor, uv.xy, 0);
+	vec4 rim_pixel= texelFetch(strokeRim, uv.xy, 0);
+
+	vec4 outcolor = src_pixel;
+
+	/* is transparent */
+	if (src_pixel.a == 0.0f) {
+		discard;
+	}
+	/* pixel is equal to mask color, keep */
+	else if (src_pixel.rgb == mask_color.rgb) {
+		outcolor = src_pixel;
+	}
+	else {
+		if (rim_pixel.a == 0.0f) {
+			outcolor = src_pixel;
+		}
+		else {
+			outcolor = get_blend_color(mode, src_pixel, rim_pixel);
+		}
+	}
+
+	gl_FragDepth = stroke_depth;
+	FragColor = outcolor;
+}