Differential D2889 Diff 11446 source/blender/draw/engines/gpencil/shaders/fx/gpencil_fx_colorize_frag.glsl

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source/blender/draw/engines/gpencil/shaders/fx/gpencil_fx_colorize_frag.glsl

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				uniform sampler2D strokeColor;
				uniform sampler2D strokeDepth;

				uniform vec4 low_color;
				uniform vec4 high_color;
				uniform int mode;
				uniform float factor;

				out vec4 FragColor;

				#define MODE_GRAYSCALE 0
				#define MODE_SEPIA 1
				#define MODE_BITONE 2
				#define MODE_CUSTOM 3
				#define MODE_TRANSPARENT 4

				float get_luminance(vec4 color)
				{
				float lum = (color.r * 0.2126) + (color.g * 0.7152) + (color.b * 0.723);
				return lum;
				}

				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);
				float luminance = get_luminance(src_pixel);
				vec4 outcolor;

				/* is transparent */
				if (src_pixel.a == 0.0f) {
				discard;
				}

				switch(mode) {
				case MODE_GRAYSCALE:
				{
				outcolor = vec4(luminance, luminance, luminance, src_pixel.a);
				break;
				}
				case MODE_SEPIA:
				{
				float Red = (src_pixel.r * 0.393) + (src_pixel.g * 0.769) + (src_pixel.b * 0.189);
				float Green = (src_pixel.r * 0.349) + (src_pixel.g * 0.686) + (src_pixel.b * 0.168);
				float Blue = (src_pixel.r * 0.272) + (src_pixel.g * 0.534) + (src_pixel.b * 0.131);
				outcolor = vec4(Red, Green, Blue, src_pixel.a);
				break;
				}
				case MODE_BITONE:
				{
				if (luminance <= factor) {
				outcolor = low_color;
				}
				else {
				outcolor = high_color;
				}
				break;
				}
				case MODE_CUSTOM:
				{
				/* if below umbral, force custom color */
				if (luminance <= factor) {
				outcolor = low_color;
				}
				else {
				outcolor = vec4(luminance * low_color.r, luminance * low_color.b, luminance * low_color.b, src_pixel.a);
				}
				break;
				}
				case MODE_TRANSPARENT:
				{
				outcolor = vec4(src_pixel.rgb, src_pixel.a * factor);
				break;
				}
				default:
				{
				outcolor = src_pixel;
				}

				}

				gl_FragDepth = stroke_depth;
				FragColor = outcolor;
				}