diff options
Diffstat (limited to 'source/blender/draw/intern/shaders/common_shape_lib.glsl')
| -rw-r--r-- | source/blender/draw/intern/shaders/common_shape_lib.glsl | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/source/blender/draw/intern/shaders/common_shape_lib.glsl b/source/blender/draw/intern/shaders/common_shape_lib.glsl new file mode 100644 index 00000000000..f2c8bf0faaf --- /dev/null +++ b/source/blender/draw/intern/shaders/common_shape_lib.glsl @@ -0,0 +1,202 @@ + +#pragma BLENDER_REQUIRE(common_math_geom_lib.glsl) + +/** + * Geometric shape structures. + * Some constructors might seems redundant but are here to make the API cleaner and + * allow for more than one constructor per type. + */ + +/* ---------------------------------------------------------------------- */ +/** \name Circle + * \{ */ + +struct Circle { + vec2 center; + float radius; +}; + +Circle shape_circle(vec2 center, float radius) +{ + return Circle(center, radius); +} + +/** \} */ + +/* ---------------------------------------------------------------------- */ +/** \name Sphere + * \{ */ + +struct Sphere { + vec3 center; + float radius; +}; + +Sphere shape_sphere(vec3 center, float radius) +{ + return Sphere(center, radius); +} + +/** \} */ + +/* ---------------------------------------------------------------------- */ +/** \name Box + * \{ */ + +struct Box { + vec3 corners[8]; +}; + +/* Construct box from 4 basis points. */ +Box shape_box(vec3 v000, vec3 v100, vec3 v010, vec3 v001) +{ + v100 -= v000; + v010 -= v000; + v001 -= v000; + Box box; + box.corners[0] = v000; + box.corners[1] = v000 + v100; + box.corners[2] = v000 + v010 + v100; + box.corners[3] = v000 + v010; + box.corners[4] = box.corners[0] + v001; + box.corners[5] = box.corners[1] + v001; + box.corners[6] = box.corners[2] + v001; + box.corners[7] = box.corners[3] + v001; + return box; +} + +/** \} */ + +/* ---------------------------------------------------------------------- */ +/** \name Square Pyramid + * \{ */ + +struct Pyramid { + /* Apex is the first. Base vertices are in clockwise order from front view. */ + vec3 corners[5]; +}; + +/** + * Regular Square Pyramid (can be oblique). + * Use this corner order. + * (Top-Down View of the pyramid) + * <pre> + * + * Y + * | + * | + * .-----X + * + * 4-----------3 + * | \ / | + * | \ / | + * | 0 | + * | / \ | + * | / \ | + * 1-----------2 + * </pre> + * base_corner_00 is vertex 1 + * base_corner_01 is vertex 2 + * base_corner_10 is vertex 4 + */ +Pyramid shape_pyramid(vec3 apex, vec3 base_corner_00, vec3 base_corner_01, vec3 base_corner_10) +{ + Pyramid pyramid; + pyramid.corners[0] = apex; + pyramid.corners[1] = base_corner_00; + pyramid.corners[2] = base_corner_01; + pyramid.corners[3] = base_corner_10 + (base_corner_01 - base_corner_00); + pyramid.corners[4] = base_corner_10; + return pyramid; +} + +/** + * Regular Square Pyramid. + * <pre> + * + * Y + * | + * | + * .-----X + * + * 4-----Y-----3 + * | \ | / | + * | \ | / | + * | 0-----X + * | / \ | + * | / \ | + * 1-----------2 + * </pre> + * base_center_pos_x is vector from base center to X + * base_center_pos_y is vector from base center to Y + */ +Pyramid shape_pyramid_non_oblique(vec3 apex, + vec3 base_center, + vec3 base_center_pos_x, + vec3 base_center_pos_y) +{ + Pyramid pyramid; + pyramid.corners[0] = apex; + pyramid.corners[1] = base_center - base_center_pos_x - base_center_pos_y; + pyramid.corners[2] = base_center + base_center_pos_x - base_center_pos_y; + pyramid.corners[3] = base_center + base_center_pos_x + base_center_pos_y; + pyramid.corners[4] = base_center - base_center_pos_x + base_center_pos_y; + return pyramid; +} + +/** \} */ + +/* ---------------------------------------------------------------------- */ +/** \name Frustum + * \{ */ + +struct Frustum { + vec3 corners[8]; +}; + +/** + * Use this corner order. + * <pre> + * + * Z Y + * | / + * |/ + * .-----X + * 2----------6 + * /| /| + * / | / | + * 1----------5 | + * | | | | + * | 3-------|--7 + * | / | / + * |/ |/ + * 0----------4 + * </pre> + */ +Frustum shape_frustum(vec3 corners[8]) +{ + Frustum frustum; + for (int i = 0; i < 8; i++) { + frustum.corners[i] = corners[i]; + } + return frustum; +} + +/** \} */ + +/* ---------------------------------------------------------------------- */ +/** \name Cone + * \{ */ + +/* Cone at orign with no height. */ +struct Cone { + vec3 direction; + float angle_cos; +}; + +Cone shape_cone(vec3 direction, float angle_cosine) +{ + return Cone(direction, angle_cosine); +} + +/** \} */ |