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softgpu: Detect longer strips of rectangles.

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Could maybe even combine these into one large rectangle, but the main
benefit is avoiding triangles.
This commit is contained in:
Unknown W. Brackets 2022-09-11 21:49:37 -07:00
parent 288d18447d
commit 151727ee01
1 changed files with 29 additions and 15 deletions
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44
GPU/Software/TransformUnit.cpp
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@ -686,30 +686,44 @@ void TransformUnit::SubmitPrimitive(const void* vertices, const void* indices, G
{
// Don't draw a triangle when loading the first two vertices.
int skip_count = data_index_ >= 2 ? 0 : 2 - data_index_;
int start_vtx = 0;
// If index count == 4, check if we can convert to a rectangle.
// This is for Darkstalkers (and should speed up many 2D games).
if (data_index_ == 0 && vertex_count == 4 && cullType == CullType::OFF) {
for (int vtx = 0; vtx < 4; ++vtx) {
if (indices) {
vreader.Goto(ConvertIndex(vtx) - index_lower_bound);
if (data_index_ == 0 && vertex_count >= 4 && (vertex_count & 1) == 0 && cullType == CullType::OFF) {
for (int base = 0; base < vertex_count - 2; base += 2) {
for (int vtx = base == 0 ? 0 : 2; vtx < 4; ++vtx) {
if (indices) {
vreader.Goto(ConvertIndex(base + vtx) - index_lower_bound);
} else {
vreader.Goto(base + vtx);
}
data_[vtx] = ReadVertex(vreader, transformState, outside_range_flag);
}
else {
vreader.Goto(vtx);
}
data_[vtx] = ReadVertex(vreader, transformState, outside_range_flag);
}
// If a strip is effectively a rectangle, draw it as such!
int tl = -1, br = -1;
if (!outside_range_flag && Rasterizer::DetectRectangleFromStrip(binner_->State(), data_, &tl, &br)) {
Clipper::ProcessRect(data_[tl], data_[br], *binner_);
break;
// If a strip is effectively a rectangle, draw it as such!
int tl = -1, br = -1;
if (!outside_range_flag && Rasterizer::DetectRectangleFromStrip(binner_->State(), data_, &tl, &br)) {
Clipper::ProcessRect(data_[tl], data_[br], *binner_);
start_vtx += 2;
if (base + 4 >= vertex_count) {
start_vtx = vertex_count;
break;
}
// Just copy the first two so we can detect easier.
// TODO: Maybe should give detection two halves?
data_[0] = data_[2];
data_[1] = data_[3];
} else {
// Go into triangle mode. Unfortunately, we re-read the verts.
break;
}
}
}
outside_range_flag = false;
for (int vtx = 0; vtx < vertex_count; ++vtx) {
for (int vtx = start_vtx; vtx < vertex_count; ++vtx) {
if (indices) {
vreader.Goto(ConvertIndex(vtx) - index_lower_bound);
} else {