diff options
Diffstat (limited to 'source/blender/editors/interface/view2d.c')
| -rw-r--r-- | source/blender/editors/interface/view2d.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/source/blender/editors/interface/view2d.c b/source/blender/editors/interface/view2d.c index ca96fde9810..30483f11c45 100644 --- a/source/blender/editors/interface/view2d.c +++ b/source/blender/editors/interface/view2d.c @@ -32,6 +32,7 @@ #include "DNA_userdef_types.h" #include "BLI_array.h" +#include "BLI_easing.h" #include "BLI_link_utils.h" #include "BLI_listbase.h" #include "BLI_math.h" @@ -1291,6 +1292,114 @@ void UI_view2d_multi_grid_draw( immUnbindProgram(); } +static void grid_axis_start_and_count( + const float step, const float min, const float max, float *r_start, int *r_count) +{ + *r_start = min; + if (*r_start < 0.0f) { + *r_start += -(float)fmod(min, step); + } + else { + *r_start += step - (float)fabs(fmod(min, step)); + } + + if (*r_start > max) { + *r_count = 0; + } + else { + *r_count = (max - *r_start) / step + 1; + } +} + +typedef struct DotGridLevelInfo { + /* The factor applied to the #min_step argument. This could be easily computed in runtime, + * but seeing it together with the other values is helpful. */ + float step_factor; + /* The normalized zoom level at which the grid level starts to fade in. + * At lower zoom levels, the points will not be visible and the level will be skipped. */ + float fade_in_start_zoom; + /* The normalized zoom level at which the grid finishes fading in. + * At higher zoom levels, the points will be opaque. */ + float fade_in_end_zoom; +} DotGridLevelInfo; + +static const DotGridLevelInfo level_info[9] = { + {128.0f, -0.1f, 0.01f}, + {64.0f, 0.0f, 0.025f}, + {32.0f, 0.025f, 0.15f}, + {16.0f, 0.05f, 0.2f}, + {8.0f, 0.1f, 0.25f}, + {4.0f, 0.125f, 0.3f}, + {2.0f, 0.25f, 0.5f}, + {1.0f, 0.7f, 0.9f}, + {0.5f, 0.6f, 0.9f}, +}; + +/** + * Draw a multi-level grid of dots, with a dynamic number of levels based on the fading. + * + * \param grid_color_id: The theme color used for the points. Faded dynamically based on zoom. + * \param min_step: The base size of the grid. At different zoom levels, the visible grid may have + * a larger step size. + * \param grid_levels: The maximum grid depth. Larger grid levels will subdivide the grid more. + */ +void UI_view2d_dot_grid_draw(const View2D *v2d, + const int grid_color_id, + const float min_step, + const int grid_levels) +{ + BLI_assert(grid_levels > 0 && grid_levels < 10); + const float zoom_x = (float)(BLI_rcti_size_x(&v2d->mask) + 1) / BLI_rctf_size_x(&v2d->cur); + const float zoom_normalized = (zoom_x - v2d->minzoom) / (v2d->maxzoom - v2d->minzoom); + + GPUVertFormat *format = immVertexFormat(); + const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT); + const uint color_id = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT); + immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR); + GPU_point_size(3.0f * UI_DPI_FAC); + + float color[4]; + UI_GetThemeColor3fv(grid_color_id, color); + + for (int level = 0; level < grid_levels; level++) { + const DotGridLevelInfo *info = &level_info[level]; + const float step = min_step * info->step_factor; + + const float alpha_factor = (zoom_normalized - info->fade_in_start_zoom) / + (info->fade_in_end_zoom - info->fade_in_start_zoom); + color[3] = clamp_f(BLI_easing_cubic_ease_in_out(alpha_factor, 0.0f, 1.0f, 1.0f), 0.0f, 1.0f); + if (color[3] == 0.0f) { + break; + } + + int count_x; + float start_x; + grid_axis_start_and_count(step, v2d->cur.xmin, v2d->cur.xmax, &start_x, &count_x); + int count_y; + float start_y; + grid_axis_start_and_count(step, v2d->cur.ymin, v2d->cur.ymax, &start_y, &count_y); + if (count_x == 0 || count_y == 0) { + continue; + } + + immBegin(GPU_PRIM_POINTS, count_x * count_y); + + /* Theoretically drawing on top of lower grid levels could be avoided, but it would also + * increase the complexity of this loop, which isn't worth the time at the moment. */ + for (int i_y = 0; i_y < count_y; i_y++) { + const float y = start_y + step * i_y; + for (int i_x = 0; i_x < count_x; i_x++) { + const float x = start_x + step * i_x; + immAttr4fv(color_id, color); + immVertex2f(pos, x, y); + } + } + + immEnd(); + } + + immUnbindProgram(); +} /** \} */ /* -------------------------------------------------------------------- */ |