TakeV/dxx-rebirth
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

Skip unnecessary segment rendering phases

Browse source 
Make object rendering traverse only the subrange of segments with
objects.

Make alpha rendering traverse only the subrange of segments with alpha
blended textures.
This commit is contained in:
Kp 2014-12-13 17:19:28 +00:00
parent 0b086b1b0d
commit 3f52e3426a
1 changed files with 52 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

54
similar/main/render.cpp
View file

@ -1510,6 +1510,7 @@ done_list:
//renders onto current canvas
void render_mine(segnum_t start_seg_num,fix eye_offset, window_rendered_data &window)
{
using std::advance;
render_state_t rstate;
// Initialize number of objects (actually, robots!) rendered this frame.
window.rendered_robots.clear();
@ -1577,6 +1578,12 @@ void render_mine(segnum_t start_seg_num,fix eye_offset, window_rendered_data &wi
if (eye_offset<=0) // Do for left eye or zero.
set_dynamic_light(rstate);
if (reversed_render_range.empty())
/* Impossible, but later code has undefined behavior if this
* happens
*/
return;
if (!_search_mode && Clear_window == 2) {
if (first_terminal_seg < rstate.N_render_segs) {
if (Clear_window_color == -1)
@ -1643,6 +1650,44 @@ void render_mine(segnum_t start_seg_num,fix eye_offset, window_rendered_data &wi
}
}
#else
struct render_subrange : partial_range_t<std::reverse_iterator<segnum_t *>>
{
iterator *m_pbegin;
render_subrange(iterator i) :
partial_range_t<iterator>(i, std::prev(i)),
m_pbegin(&m_begin)
{
}
/* Prevent pointing m_pbegin at m_begin of different instance */
render_subrange(const render_subrange &rhs) = delete;
render_subrange &operator=(const render_subrange &rhs) = delete;
void record(iterator p, iterator &dummy)
{
*m_pbegin = m_end = p;
m_pbegin = &dummy;
}
};
struct render_ranges
{
typedef render_subrange::iterator iterator;
iterator dummy_write_only_begin;
render_subrange reversed_object_render_range, reversed_alpha_segment_render_range;
render_ranges(iterator e) :
reversed_object_render_range(e),
reversed_alpha_segment_render_range(e)
{
}
void record_object(iterator p)
{
reversed_object_render_range.record(p, dummy_write_only_begin);
}
void record_alpha(iterator p)
{
reversed_alpha_segment_render_range.record(p, dummy_write_only_begin);
}
};
/* Initially empty */
render_ranges rr{reversed_render_range.end()};
// Sorting elements for Alpha - 3 passes
// First Pass: render opaque level geometry + transculent level geometry with high Alpha-Test func
for (auto iter = reversed_render_range.begin(); iter != reversed_render_range.end(); ++iter)
@ -1657,6 +1702,8 @@ void render_mine(segnum_t start_seg_num,fix eye_offset, window_rendered_data &wi
#endif
{
Current_seg_depth = srsm.Seg_depth;
if (!srsm.objects.empty())
rr.record_object(iter);
//set global render window vars
{
@ -1691,6 +1738,7 @@ void render_mine(segnum_t start_seg_num,fix eye_offset, window_rendered_data &wi
glAlphaFunc(GL_GEQUAL,0.8);
render_side(seg, sn);
glAlphaFunc(GL_GEQUAL,0.02);
rr.record_alpha(iter);
}
else
render_side(seg, sn);
@ -1704,7 +1752,8 @@ void render_mine(segnum_t start_seg_num,fix eye_offset, window_rendered_data &wi
visited.clear();
// Second Pass: Objects
range_for (auto segnum, reversed_render_range)
advance(rr.reversed_object_render_range.m_end, 1);
range_for (auto segnum, rr.reversed_object_render_range)
{
auto &srsm = rstate.render_seg_map[segnum];
if (srsm.objects.empty())
@ -1744,7 +1793,8 @@ void render_mine(segnum_t start_seg_num,fix eye_offset, window_rendered_data &wi
visited.clear();
// Third Pass - Render Transculent level geometry with normal Alpha-Func
range_for (auto segnum, reversed_render_range)
advance(rr.reversed_alpha_segment_render_range.m_end, 1);
range_for (auto segnum, rr.reversed_alpha_segment_render_range)
{
auto &srsm = rstate.render_seg_map[segnum];