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Remove Degenerate Triangles in Objects

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korenkonder
2024-04-07 18:17:36 +03:00
parent 21b6ce93de
commit ca7548d56e
1 changed files with 71 additions and 0 deletions
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src/CRE/object.cpp
+71
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@@ -25,6 +25,9 @@ static GLuint create_vertex_buffer(size_t size, const void* data, bool dynamic =
static void free_index_buffer(GLuint buffer);
static void free_vertex_buffer(GLuint buffer);
static uint32_t remove_degenerate_triangle_indices(
uint32_t* dst_index_array, const uint32_t num_index, uint32_t* src_index_array);
static void ObjsetInfo_calc_axis_aligned_bounding_box(ObjsetInfo* info);
static void ObjsetInfo_get_shader_index_texture_index(ObjsetInfo* info);
static bool ObjsetInfo_index_buffer_load(ObjsetInfo* info);
@@ -79,6 +82,15 @@ void* obj_mesh_index_buffer::fill_data(void* data, obj_mesh& mesh) {
uint16_t* indices = (uint16_t*)data;
for (uint32_t i = 0; i < mesh.num_submesh; i++) {
obj_sub_mesh& sub_mesh = mesh.submesh_array[i];
if (sub_mesh.primitive_type == OBJ_PRIMITIVE_TRIANGLE_STRIP && !(sub_mesh.attrib.w & 0x80)){
uint32_t* index_array = force_malloc<uint32_t>(sub_mesh.num_index);
sub_mesh.num_index = remove_degenerate_triangle_indices(
index_array, sub_mesh.num_index, sub_mesh.index_array);
memmove(sub_mesh.index_array, index_array, sizeof(uint32_t) * sub_mesh.num_index);
free_def(index_array);
}
uint32_t num_index = sub_mesh.num_index;
uint32_t* index = sub_mesh.index_array;
for (uint32_t j = num_index; j; j--, index++)
@@ -2218,6 +2230,65 @@ static void free_vertex_buffer(GLuint buffer) {
glGetError();
}
static uint32_t remove_degenerate_triangle_indices(
uint32_t* dst_index_array, const uint32_t num_index, uint32_t* src_index_array) {
if (!num_index)
return 0;
dst_index_array[0] = src_index_array[0];
uint32_t src_index = 1;
uint32_t dst_index = 1;
uint32_t strip_length = 1;
while (src_index < num_index - 4)
if (src_index_array[src_index] != src_index_array[src_index + 1]) {
dst_index_array[dst_index++] = src_index_array[src_index];
strip_length++;
src_index++;
}
else if (src_index_array[src_index + 3] == src_index_array[src_index + 4]) {
dst_index_array[dst_index++] = src_index_array[src_index];
dst_index_array[dst_index++] = 0xFFFFFFFF;
dst_index_array[dst_index++] = src_index_array[src_index + 4];
if (strip_length % 2) {
dst_index_array[dst_index++] = src_index_array[src_index + 4];
strip_length = 0;
}
else
strip_length = 1;
src_index += 5;
}
else if (src_index_array[src_index - 1] != src_index_array[src_index + 2]
|| src_index_array[src_index + 1] != src_index_array[src_index + 4]) {
dst_index_array[dst_index++] = src_index_array[src_index];
dst_index_array[dst_index++] = 0xFFFFFFFF;
dst_index_array[dst_index++] = src_index_array[src_index + 3];
if (!(strip_length % 2)) {
dst_index_array[dst_index++] = src_index_array[src_index + 3];
strip_length = 0;
}
else
strip_length = 1;
src_index += 4;
}
else {
dst_index_array[dst_index++] = src_index_array[src_index];
strip_length++;
src_index += 5;
}
if (src_index < num_index) {
src_index_array += src_index;
dst_index_array += dst_index;
dst_index += num_index - src_index;
while (src_index++ < num_index)
*dst_index_array++ = *src_index_array++;
}
return dst_index;
}
static void ObjsetInfo_calc_axis_aligned_bounding_box(ObjsetInfo* info) {
obj_set* set = info->obj_set;
for (uint32_t i = 0; i < set->obj_num; i++) {