[Bf-blender-cvs] [170844135aa] blender-v2.82-release: Fix T67050 Overlay: Forcefield limits are not dashed

[Clément Foucault]

Commit: 170844135aa826423394210039047070a99e8a85
Author: Clément Foucault
Date:   Thu Jan 23 15:38:33 2020 +0100
Branches: blender-v2.82-release
https://developer.blender.org/rB170844135aa826423394210039047070a99e8a85

Fix T67050 Overlay: Forcefield limits are not dashed

This adds some kind of dashing to the tube and cone limits. Although the
dashing is in object space and is not a good as old dashing. But it is
the least time consuming and least complex solution.

===================================================================

M	source/blender/draw/intern/draw_cache.c

===================================================================

diff --git a/source/blender/draw/intern/draw_cache.c b/source/blender/draw/intern/draw_cache.c
index 4d10e781e79..f2e43e032a9 100644
--- a/source/blender/draw/intern/draw_cache.c
+++ b/source/blender/draw/intern/draw_cache.c
@@ -1222,10 +1222,11 @@ GPUBatch *DRW_cache_field_curve_get(void)
 GPUBatch *DRW_cache_field_tube_limit_get(void)
 {
 #define CIRCLE_RESOL 32
+#define SIDE_STIPPLE 32
   if (!SHC.drw_field_tube_limit) {
     GPUVertFormat format = extra_vert_format();
 
-    int v_len = 2 * (CIRCLE_RESOL * 2 + 4);
+    int v_len = 2 * (CIRCLE_RESOL * 2 + 4 * SIDE_STIPPLE / 2);
     GPUVertBuf *vbo = GPU_vertbuf_create_with_format(&format);
     GPU_vertbuf_data_alloc(vbo, v_len);
 
@@ -1233,14 +1234,14 @@ GPUBatch *DRW_cache_field_tube_limit_get(void)
     int flag = VCLASS_EMPTY_SIZE;
     /* Caps */
     for (int i = 0; i < 2; i++) {
-      float z = (float)i * 2.0f - 1.0f;
-      circle_verts(vbo, &v, CIRCLE_RESOL, 1.0f, z, flag);
+      float z = i * 2.0f - 1.0f;
+      circle_dashed_verts(vbo, &v, CIRCLE_RESOL, 1.0f, z, flag);
     }
     /* Side Edges */
     for (int a = 0; a < 4; a++) {
-      for (int i = 0; i < 2; i++) {
-        float z = (float)i * 2.0f - 1.0f;
-        float angle = (2.0f * M_PI * a) / 4.0f;
+      float angle = (2.0f * M_PI * a) / 4.0f;
+      for (int i = 0; i < SIDE_STIPPLE; i++) {
+        float z = (i / (float)SIDE_STIPPLE) * 2.0f - 1.0f;
         GPU_vertbuf_vert_set(vbo, v++, &(Vert){{sinf(angle), cosf(angle), z}, flag});
       }
     }
@@ -1248,16 +1249,18 @@ GPUBatch *DRW_cache_field_tube_limit_get(void)
     SHC.drw_field_tube_limit = GPU_batch_create_ex(GPU_PRIM_LINES, vbo, NULL, GPU_BATCH_OWNS_VBO);
   }
   return SHC.drw_field_tube_limit;
+#undef SIDE_STIPPLE
 #undef CIRCLE_RESOL
 }
 
 GPUBatch *DRW_cache_field_cone_limit_get(void)
 {
 #define CIRCLE_RESOL 32
+#define SIDE_STIPPLE 32
   if (!SHC.drw_field_cone_limit) {
     GPUVertFormat format = extra_vert_format();
 
-    int v_len = 2 * (CIRCLE_RESOL * 2 + 4);
+    int v_len = 2 * (CIRCLE_RESOL * 2 + 4 * SIDE_STIPPLE / 2);
     GPUVertBuf *vbo = GPU_vertbuf_create_with_format(&format);
     GPU_vertbuf_data_alloc(vbo, v_len);
 
@@ -1265,14 +1268,14 @@ GPUBatch *DRW_cache_field_cone_limit_get(void)
     int flag = VCLASS_EMPTY_SIZE;
     /* Caps */
     for (int i = 0; i < 2; i++) {
-      float z = (float)i * 2.0f - 1.0f;
-      circle_verts(vbo, &v, CIRCLE_RESOL, 1.0f, z, flag);
+      float z = i * 2.0f - 1.0f;
+      circle_dashed_verts(vbo, &v, CIRCLE_RESOL, 1.0f, z, flag);
     }
     /* Side Edges */
     for (int a = 0; a < 4; a++) {
-      for (int i = 0; i < 2; i++) {
-        float z = (float)i * 2.0f - 1.0f;
-        float angle = (2.0f * M_PI * a) / 4.0f;
+      float angle = (2.0f * M_PI * a) / 4.0f;
+      for (int i = 0; i < SIDE_STIPPLE; i++) {
+        float z = (i / (float)SIDE_STIPPLE) * 2.0f - 1.0f;
         GPU_vertbuf_vert_set(vbo, v++, &(Vert){{sinf(angle) * z, cosf(angle) * z, z}, flag});
       }
     }
@@ -1280,6 +1283,7 @@ GPUBatch *DRW_cache_field_cone_limit_get(void)
     SHC.drw_field_cone_limit = GPU_batch_create_ex(GPU_PRIM_LINES, vbo, NULL, GPU_BATCH_OWNS_VBO);
   }
   return SHC.drw_field_cone_limit;
+#undef SIDE_STIPPLE
 #undef CIRCLE_RESOL
 }