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Merge pull request #88 from bear24rw/imdrawidx_32bit

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Fix overflow when using 32-bit ImDrawIdx
This commit is contained in:
Evan Pezent 2020-08-15 23:25:11 -05:00 committed by GitHub
parent 0969a8df83 1ec47915d3
commit c09d160d19
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 8 additions and 7 deletions
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15
implot.cpp
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@ -2286,15 +2286,16 @@ struct TransformerLogLog {
/// Renders primitive shapes in bulk as efficiently as possible.
template <typename Renderer>
inline void RenderPrimitives(Renderer renderer, ImDrawList& DrawList) {
int prims = renderer.Prims;
int prims_culled = 0;
int idx = 0;
unsigned int prims = renderer.Prims;
unsigned int prims_culled = 0;
unsigned int idx = 0;
static const unsigned int max_idx = (unsigned int)(ImPow(2.0f, (float)(sizeof(ImDrawIdx) * 8)) - 1);
const ImVec2 uv = DrawList._Data->TexUvWhitePixel;
while (prims) {
// find how many can be reserved up to end of current draw command's limit
int cnt = (int)ImMin(size_t(prims), (((size_t(1) << sizeof(ImDrawIdx) * 8) - 1 - DrawList._VtxCurrentIdx) / Renderer::VtxConsumed));
unsigned int cnt = (unsigned int)ImMin(prims, (max_idx - DrawList._VtxCurrentIdx) / Renderer::VtxConsumed);
// make sure at least this many elements can be rendered to avoid situations where at the end of buffer this slow path is not taken all the time
if (cnt >= ImMin(64, prims)) {
if (cnt >= ImMin(64u, prims)) {
if (prims_culled >= cnt)
prims_culled -= cnt; // reuse previous reservation
else {
@ -2308,11 +2309,11 @@ inline void RenderPrimitives(Renderer renderer, ImDrawList& DrawList) {
DrawList.PrimUnreserve(prims_culled * Renderer::IdxConsumed, prims_culled * Renderer::VtxConsumed);
prims_culled = 0;
}
cnt = (int)ImMin(size_t(prims), (((size_t(1) << sizeof(ImDrawIdx) * 8) - 1 - 0/*DrawList._VtxCurrentIdx*/) / Renderer::VtxConsumed));
cnt = (unsigned int)ImMin(prims, (max_idx - 0/*DrawList._VtxCurrentIdx*/) / Renderer::VtxConsumed);
DrawList.PrimReserve(cnt * Renderer::IdxConsumed, cnt * Renderer::VtxConsumed); // reserve new draw command
}
prims -= cnt;
for (int ie = idx + cnt; idx != ie; ++idx) {
for (unsigned int ie = idx + cnt; idx != ie; ++idx) {
if (!renderer(DrawList, uv, idx))
prims_culled++;
}