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OpenGL: simple batch of all mesh triangles 

Can be used for drawing basic surfaces, hit testing, depth pre-pass, ...
This commit is contained in:
Mike Erwin 2016-11-06 21:51:49 +01:00
parent c1ba58c44d
commit 1cd754ad31
1 changed files with 32 additions and 7 deletions
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39
source/blender/editors/space_view3d/drawobject.c
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@ -215,11 +215,11 @@ typedef struct drawBMSelect_userData {
typedef struct {
VertexBuffer *pos_in_order;
ElementList *edges_in_order;
ElementList *faces_in_order;
ElementList *triangles_in_order;
Batch *all_verts;
Batch *all_edges;
Batch *all_faces;
Batch *all_triangles;
Batch *fancy_edges; /* owns its vertex buffer (not shared) */
} MeshBatchCache;
@ -239,11 +239,11 @@ static void MBC_discard(MeshBatchCache *cache)
{
if (cache->all_verts) Batch_discard(cache->all_verts);
if (cache->all_edges) Batch_discard(cache->all_edges);
if (cache->all_faces) Batch_discard(cache->all_faces);
if (cache->all_triangles) Batch_discard(cache->all_triangles);
if (cache->pos_in_order) VertexBuffer_discard(cache->pos_in_order);
if (cache->edges_in_order) ElementList_discard(cache->edges_in_order);
if (cache->faces_in_order) ElementList_discard(cache->faces_in_order);
if (cache->triangles_in_order) ElementList_discard(cache->triangles_in_order);
if (cache->fancy_edges) {
Batch_discard_all(cache->fancy_edges);
@ -316,6 +316,30 @@ static ElementList *MBC_get_edges_in_order(DerivedMesh *dm)
return cache->edges_in_order;
}
static ElementList *MBC_get_triangles_in_order(DerivedMesh *dm)
{
MeshBatchCache *cache = MBC_get(dm);
if (cache->triangles_in_order == NULL) {
const int vertex_ct = dm->getNumVerts(dm);
const int tessface_ct = dm->getNumTessFaces(dm);
const MFace *tessfaces = dm->getTessFaceArray(dm);
ElementListBuilder elb;
ElementListBuilder_init(&elb, GL_TRIANGLES, tessface_ct, vertex_ct);
for (int i = 0; i < tessface_ct; ++i) {
const MFace *tess = tessfaces + i;
add_triangle_vertices(&elb, tess->v1, tess->v2, tess->v3);
/* tessface can be triangle or quad */
if (tess->v4) {
add_triangle_vertices(&elb, tess->v3, tess->v2, tess->v4);
}
}
cache->triangles_in_order = ElementList_build(&elb);
}
return cache->triangles_in_order;
}
static Batch *MBC_get_all_edges(DerivedMesh *dm)
{
MeshBatchCache *cache = MBC_get(dm);
@ -328,15 +352,16 @@ static Batch *MBC_get_all_edges(DerivedMesh *dm)
return cache->all_edges;
}
static Batch *MBC_get_all_faces(DerivedMesh *dm)
static Batch *MBC_get_all_triangles(DerivedMesh *dm)
{
MeshBatchCache *cache = MBC_get(dm);
if (cache->all_faces == NULL) {
if (cache->all_triangles == NULL) {
/* create batch from DM */
cache->all_triangles = Batch_create(GL_TRIANGLES, MBC_get_pos_in_order(dm), MBC_get_triangles_in_order(dm));
}
return cache->all_faces;
return cache->all_triangles;
}
static Batch *MBC_get_fancy_edges(DerivedMesh *dm)