1 files changed, 91 insertions, 0 deletions
diff --git a/source/blender/draw/modes/shaders/animviz_mpath_lines_vert.glsl b/source/blender/draw/modes/shaders/animviz_mpath_lines_vert.glsl
new file mode 100644
index 00000000000..276f4004fb6
--- /dev/null
+++ b/source/blender/draw/modes/shaders/animviz_mpath_lines_vert.glsl
@@ -0,0 +1,91 @@
+
+uniform mat4 ViewMatrix;
+uniform mat4 ViewProjectionMatrix;
+uniform vec2 viewportSize;
+
+uniform int frameCurrent;
+uniform int frameStart;
+uniform int frameEnd;
+uniform int cacheStart;
+uniform bool selected;
+uniform bool useCustomColor;
+uniform vec3 customColor;
+
+in vec3 pos;
+
+out vec2 ssPos;
+out vec4 finalColor_geom;
+
+/* project to screen space */
+vec2 proj(vec4 pos)
+{
+	return (0.5 * (pos.xy / pos.w) + 0.5) * viewportSize;
+}
+
+#define SET_INTENSITY(A, B, C, min, max) (((1.0 - (float(C - B) / float(C - A))) * (max - min)) + min)
+
+void main()
+{
+	gl_Position = ViewProjectionMatrix * vec4(pos, 1.0);
+
+	ssPos = proj(gl_Position);
+
+	int frame = gl_VertexID + cacheStart;
+
+	float intensity;  /* how faint */
+
+	vec3 blend_base = (abs(frame - frameCurrent) == 1) ? colorCurrentFrame.rgb : colorBackground.rgb; /* "bleed" cframe color to ease color blending */
+
+	/* TODO: We might want something more consistent with custom color and standard colors. */
+	if (frame < frameCurrent) {
+		if (useCustomColor) {
+			/* Custom color: previous frames color is darker than current frame */
+			finalColor_geom.rgb = customColor * 0.25;
+		}
+		else {
+			/* black - before frameCurrent */
+			if (selected) {
+				intensity = SET_INTENSITY(frameStart, frame, frameCurrent, 0.25, 0.75);
+			}
+			else {
+				intensity = SET_INTENSITY(frameStart, frame, frameCurrent, 0.68, 0.92);
+			}
+			finalColor_geom.rgb = mix(colorWire.rgb, blend_base, intensity);
+		}
+	}
+	else if (frame > frameCurrent) {
+		if (useCustomColor) {
+			/* Custom color: next frames color is equal to user selected color */
+			finalColor_geom.rgb = customColor;
+		}
+		else {
+			/* blue - after frameCurrent */
+			if (selected) {
+				intensity = SET_INTENSITY(frameCurrent, frame, frameEnd, 0.25, 0.75);
+			}
+			else {
+				intensity = SET_INTENSITY(frameCurrent, frame, frameEnd, 0.68, 0.92);
+			}
+
+			finalColor_geom.rgb = mix(colorBonePose.rgb, blend_base, intensity);
+		}
+	}
+	else {
+		if (useCustomColor) {
+			/* Custom color: current frame color is slightly darker than user selected color */
+			finalColor_geom.rgb = customColor * 0.5;
+		}
+		else {
+			/* green - on frameCurrent */
+			if (selected) {
+				intensity = 0.5f;
+			}
+			else {
+				intensity = 0.99f;
+			}
+			finalColor_geom.rgb = clamp(mix(colorCurrentFrame.rgb, colorBackground.rgb, intensity) - 0.1, 0.0, 0.1);
+		}
+	}
+
+	finalColor_geom.a = 1.0;
+}