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#pragma USE_SSBO_VERTEX_FETCH(TriangleList, 6)
#pragma BLENDER_REQUIRE(common_view_clipping_lib.glsl)
#pragma BLENDER_REQUIRE(common_view_lib.glsl)
#define frameCurrent mpathLineSettings.x
#define frameStart mpathLineSettings.y
#define frameEnd mpathLineSettings.z
#define cacheStart mpathLineSettings.w
/* Project to screen space. */
vec2 proj(vec4 pos)
{
return (0.5 * (pos.xy / pos.w) + 0.5) * sizeViewport.xy;
}
#define SET_INTENSITY(A, B, C, min, max) \
(((1.0 - (float(C - B) / float(C - A))) * (max - min)) + min)
vec2 compute_dir(vec2 v0, vec2 v1)
{
vec2 dir = normalize(v1 - v0 + 1e-8);
dir = vec2(-dir.y, dir.x);
return dir;
}
void do_vertex_shader(vec4 pos, int vertex_id, out vec2 out_sspos, out vec4 out_finalcolour)
{
out_sspos = proj(pos);
out_finalcolour = vec4(0.0);
int frame = vertex_id + cacheStart;
float intensity; /* how faint */
vec3 blend_base = (abs(frame - frameCurrent) == 0) ?
colorCurrentFrame.rgb :
colorBackground.rgb; /* "bleed" cframe color to ease color blending */
bool use_custom_color = customColor.x >= 0.0;
/* TODO: We might want something more consistent with custom color and standard colors. */
if (frame < frameCurrent) {
if (use_custom_color) {
/* Custom color: previous frames color is darker than current frame */
out_finalcolour.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);
}
out_finalcolour.rgb = mix(colorWire.rgb, blend_base, intensity);
}
}
else if (frame > frameCurrent) {
if (use_custom_color) {
/* Custom color: next frames color is equal to user selected color */
out_finalcolour.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);
}
out_finalcolour.rgb = mix(colorBonePose.rgb, blend_base, intensity);
}
}
else {
if (use_custom_color) {
/* Custom color: current frame color is slightly darker than user selected color */
out_finalcolour.rgb = customColor * 0.5;
}
else {
/* green - on frameCurrent */
if (selected) {
intensity = 0.92f;
}
else {
intensity = 0.75f;
}
out_finalcolour.rgb = mix(colorBackground.rgb, blend_base, intensity);
}
}
out_finalcolour.a = 1.0;
}
void main()
{
/** Determine Output Primitive ID and relative vertex. */
/* Index of the quad primitive. We generate one quad for each input line. */
int quad_id = gl_VertexID / 6;
/* Determine vertex within the quad (A, B, C)(A, C, D). */
int quad_vertex_id = gl_VertexID % 6;
/* Base index of the line primitive:
* - IF PrimType == LineList: base_vertex_id = quad_id*2
* - IF PrimType == LineStrip: base_vertex_id = quad_id
*
* Note: Primitive is LineStrip for this shader. */
int base_vertex_id = quad_id;
/* Fetch attributes for self and neighboring vertex. */
vec3 in_pos0 = vertex_fetch_attribute(base_vertex_id, pos, vec3);
vec3 in_pos1 = vertex_fetch_attribute(base_vertex_id + 1, pos, vec3);
vec4 out_pos0 = drw_view.winmat * (drw_view.viewmat * vec4(in_pos0, 1.0));
vec4 out_pos1 = drw_view.winmat * (drw_view.viewmat * vec4(in_pos1, 1.0));
/* Final calculations required for Geometry Shader alternative.
* We need to calculate values for each vertex position to correctly determine the final output
* position. */
vec2 ssPos[2];
vec4 finalColor_geom[2];
do_vertex_shader(out_pos0, base_vertex_id, ssPos[0], finalColor_geom[0]);
do_vertex_shader(out_pos1, base_vertex_id + 1, ssPos[0], finalColor_geom[0]);
/* Geometry shader alternative -- Output is trianglelist consisting of 6 vertices.
* Each vertex shader invocation is one vertex in the output primitive, so outptut
* required ID. */
vec2 t;
vec2 edge_dir = compute_dir(ssPos[0], ssPos[1]) * sizeViewportInv;
bool is_persp = (ProjectionMatrix[3][3] == 0.0);
float line_size = float(lineThickness) * sizePixel;
if (quad_vertex_id == 0) {
view_clipping_distances(out_pos0.xyz);
interp.color = finalColor_geom[0];
t = edge_dir * (line_size * (is_persp ? out_pos0.w : 1.0));
gl_Position = out_pos0 + vec4(t, 0.0, 0.0);
}
else if (quad_vertex_id == 1 || quad_vertex_id == 3) {
view_clipping_distances(out_pos0.xyz);
interp.color = finalColor_geom[0];
t = edge_dir * (line_size * (is_persp ? out_pos0.w : 1.0));
gl_Position = out_pos0 - vec4(t, 0.0, 0.0);
}
else if (quad_vertex_id == 2 || quad_vertex_id == 5) {
view_clipping_distances(out_pos1.xyz);
interp.color = finalColor_geom[1];
t = edge_dir * (line_size * (is_persp ? out_pos1.w : 1.0));
gl_Position = out_pos1 + vec4(t, 0.0, 0.0);
}
else if (quad_vertex_id == 4) {
view_clipping_distances(out_pos1.xyz);
interp.color = finalColor_geom[1];
t = edge_dir * (line_size * (is_persp ? out_pos1.w : 1.0));
gl_Position = out_pos1 - vec4(t, 0.0, 0.0);
}
}
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