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

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				out vec4 FragColor;

				uniform sampler2D strokeColor;
				uniform sampler2D strokeDepth;

				uniform float amplitude;
				uniform float period;
				uniform float phase;
				uniform int orientation;
				uniform vec2 wsize;

				#define M_PI 3.1415926535897932384626433832795

				#define HORIZONTAL 0
				#define VERTICAL 1

				void main()
				{
				vec4 outcolor;
				ivec2 uv = ivec2(gl_FragCoord.xy);
				float stroke_depth;

				float value;
				if (orientation == HORIZONTAL) {
				float pval = (uv.x * M_PI) / wsize[0];
				value = amplitude * sin((period * pval) + phase);
				outcolor = texelFetch(strokeColor, ivec2(uv.x, uv.y + value), 0);
				stroke_depth = texelFetch(strokeDepth, ivec2(uv.x, uv.y + value), 0).r;
				}
				else {
				float pval = (uv.y * M_PI) / wsize[1];
				value = amplitude * sin((period * pval) + phase);
				outcolor = texelFetch(strokeColor, ivec2(uv.x + value, uv.y), 0);
				stroke_depth = texelFetch(strokeDepth, ivec2(uv.x + value, uv.y), 0).r;
				}

				FragColor = outcolor;
				gl_FragDepth = stroke_depth;
				}