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/**
* Debugging drawing library
*
* Quick way to draw debug geometry. All input should be in world space and
* will be rendered in the default view. No additional setup required.
**/
/** Global switch option. */
bool drw_debug_draw_enable = true;
const vec4 drw_debug_default_color = vec4(1.0, 0.0, 0.0, 1.0);
/* -------------------------------------------------------------------- */
/** \name Internals
* \{ */
uint drw_debug_start_draw(uint v_needed)
{
uint vertid = atomicAdd(drw_debug_draw_v_count, v_needed);
vertid += drw_debug_draw_offset;
return vertid;
}
uint drw_debug_color_pack(vec4 color)
{
color = clamp(color, 0.0, 1.0);
uint result = 0;
result |= uint(color.x * 255.0) << 0u;
result |= uint(color.y * 255.0) << 8u;
result |= uint(color.z * 255.0) << 16u;
result |= uint(color.w * 255.0) << 24u;
return result;
}
void drw_debug_line(inout uint vertid, vec3 v1, vec3 v2, uint color)
{
drw_debug_verts_buf[vertid++] = DRWDebugVert(
floatBitsToUint(v1.x), floatBitsToUint(v1.y), floatBitsToUint(v1.z), color);
drw_debug_verts_buf[vertid++] = DRWDebugVert(
floatBitsToUint(v2.x), floatBitsToUint(v2.y), floatBitsToUint(v2.z), color);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name API
* \{ */
/**
* Draw a line.
*/
void drw_debug_line(vec3 v1, vec3 v2, vec4 color)
{
if (!drw_debug_draw_enable) {
return;
}
const uint v_needed = 2;
uint vertid = drw_debug_start_draw(v_needed);
if (vertid + v_needed < DRW_DEBUG_DRAW_VERT_MAX) {
drw_debug_line(vertid, v1, v2, drw_debug_color_pack(color));
}
}
void drw_debug_line(vec3 v1, vec3 v2)
{
drw_debug_line(v1, v2, drw_debug_default_color);
}
/**
* Draw a quad contour.
*/
void drw_debug_quad(vec3 v1, vec3 v2, vec3 v3, vec3 v4, vec4 color)
{
if (!drw_debug_draw_enable) {
return;
}
const uint v_needed = 8;
uint vertid = drw_debug_start_draw(v_needed);
if (vertid + v_needed < DRW_DEBUG_DRAW_VERT_MAX) {
uint pcolor = drw_debug_color_pack(color);
drw_debug_line(vertid, v1, v2, pcolor);
drw_debug_line(vertid, v2, v3, pcolor);
drw_debug_line(vertid, v3, v4, pcolor);
drw_debug_line(vertid, v4, v1, pcolor);
}
}
void drw_debug_quad(vec3 v1, vec3 v2, vec3 v3, vec3 v4)
{
drw_debug_quad(v1, v2, v3, v4, drw_debug_default_color);
}
/**
* Draw a point as octahedron wireframe.
*/
void drw_debug_point(vec3 p, float radius, vec4 color)
{
if (!drw_debug_draw_enable) {
return;
}
vec3 c = vec3(radius, -radius, 0);
vec3 v1 = p + c.xzz;
vec3 v2 = p + c.zxz;
vec3 v3 = p + c.yzz;
vec3 v4 = p + c.zyz;
vec3 v5 = p + c.zzx;
vec3 v6 = p + c.zzy;
const uint v_needed = 12 * 2;
uint vertid = drw_debug_start_draw(v_needed);
if (vertid + v_needed < DRW_DEBUG_DRAW_VERT_MAX) {
uint pcolor = drw_debug_color_pack(color);
drw_debug_line(vertid, v1, v2, pcolor);
drw_debug_line(vertid, v2, v3, pcolor);
drw_debug_line(vertid, v3, v4, pcolor);
drw_debug_line(vertid, v4, v1, pcolor);
drw_debug_line(vertid, v1, v5, pcolor);
drw_debug_line(vertid, v2, v5, pcolor);
drw_debug_line(vertid, v3, v5, pcolor);
drw_debug_line(vertid, v4, v5, pcolor);
drw_debug_line(vertid, v1, v6, pcolor);
drw_debug_line(vertid, v2, v6, pcolor);
drw_debug_line(vertid, v3, v6, pcolor);
drw_debug_line(vertid, v4, v6, pcolor);
}
}
void drw_debug_point(vec3 p, float radius)
{
drw_debug_point(p, radius, drw_debug_default_color);
}
void drw_debug_point(vec3 p)
{
drw_debug_point(p, 0.01);
}
/**
* Draw a sphere wireframe as 3 axes circle.
*/
void drw_debug_sphere(vec3 p, float radius, vec4 color)
{
if (!drw_debug_draw_enable) {
return;
}
const int circle_resolution = 16;
const uint v_needed = circle_resolution * 2 * 3;
uint vertid = drw_debug_start_draw(v_needed);
if (vertid + v_needed < DRW_DEBUG_DRAW_VERT_MAX) {
uint pcolor = drw_debug_color_pack(color);
for (int axis = 0; axis < 3; axis++) {
for (int edge = 0; edge < circle_resolution; edge++) {
float angle1 = (2.0 * 3.141592) * float(edge + 0) / float(circle_resolution);
vec3 p1 = vec3(cos(angle1), sin(angle1), 0.0) * radius;
p1 = vec3(p1[(0 + axis) % 3], p1[(1 + axis) % 3], p1[(2 + axis) % 3]);
float angle2 = (2.0 * 3.141592) * float(edge + 1) / float(circle_resolution);
vec3 p2 = vec3(cos(angle2), sin(angle2), 0.0) * radius;
p2 = vec3(p2[(0 + axis) % 3], p2[(1 + axis) % 3], p2[(2 + axis) % 3]);
drw_debug_line(vertid, p + p1, p + p2, pcolor);
}
}
}
}
void drw_debug_sphere(vec3 p, float radius)
{
drw_debug_sphere(p, radius, drw_debug_default_color);
}
/**
* Draw a matrix transformation as 3 colored axes.
*/
void drw_debug_matrix(mat4 mat, vec4 color)
{
vec4 p[4] = vec4[4](vec4(0, 0, 0, 1), vec4(1, 0, 0, 1), vec4(0, 1, 0, 1), vec4(0, 0, 1, 1));
for (int i = 0; i < 4; i++) {
p[i] = mat * p[i];
p[i].xyz /= p[i].w;
}
drw_debug_line(p[0].xyz, p[0].xyz, vec4(1, 0, 0, 1));
drw_debug_line(p[0].xyz, p[1].xyz, vec4(0, 1, 0, 1));
drw_debug_line(p[0].xyz, p[2].xyz, vec4(0, 0, 1, 1));
}
void drw_debug_matrix(mat4 mat)
{
drw_debug_matrix(mat, drw_debug_default_color);
}
/**
* Draw a matrix as a 2 units length bounding box, centered on origin.
*/
void drw_debug_matrix_as_bbox(mat4 mat, vec4 color)
{
vec4 p[8] = vec4[8](vec4(-1, -1, -1, 1),
vec4(1, -1, -1, 1),
vec4(1, 1, -1, 1),
vec4(-1, 1, -1, 1),
vec4(-1, -1, 1, 1),
vec4(1, -1, 1, 1),
vec4(1, 1, 1, 1),
vec4(-1, 1, 1, 1));
for (int i = 0; i < 8; i++) {
p[i] = mat * p[i];
p[i].xyz /= p[i].w;
}
drw_debug_quad(p[0].xyz, p[1].xyz, p[2].xyz, p[3].xyz, color);
drw_debug_line(p[0].xyz, p[4].xyz, color);
drw_debug_line(p[1].xyz, p[5].xyz, color);
drw_debug_line(p[2].xyz, p[6].xyz, color);
drw_debug_line(p[3].xyz, p[7].xyz, color);
drw_debug_quad(p[4].xyz, p[5].xyz, p[6].xyz, p[7].xyz, color);
}
void drw_debug_matrix_as_bbox(mat4 mat)
{
drw_debug_matrix_as_bbox(mat, drw_debug_default_color);
}
/** \} */
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