From 4c8d87d3fbfae5a96181b50b00ad701261c9d78b Mon Sep 17 00:00:00 2001 From: omar Date: Sat, 17 Jun 2017 19:25:58 +0200 Subject: [PATCH] Comments (#1188) --- imgui.cpp | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/imgui.cpp b/imgui.cpp index 6a5dbf025..a9df90597 100644 --- a/imgui.cpp +++ b/imgui.cpp @@ -2603,10 +2603,12 @@ static void AddDrawListToRenderList(ImVector& out_render_list, ImDr IM_ASSERT(draw_list->IdxBuffer.Size == 0 || draw_list->_IdxWritePtr == draw_list->IdxBuffer.Data + draw_list->IdxBuffer.Size); IM_ASSERT((int)draw_list->_VtxCurrentIdx == draw_list->VtxBuffer.Size); - // Check that draw_list doesn't use more vertices than indexable (default ImDrawIdx = 2 bytes = 64K vertices) + // Check that draw_list doesn't use more vertices than indexable (default ImDrawIdx = 2 bytes = 64K vertices per window) // If this assert triggers because you are drawing lots of stuff manually, you can: - // A) workaround by calling BeginChild()/EndChild() to put your draw commands in multiple draw lists, - // B) #define ImDrawIdx to a 'unsigned int' in imconfig.h and render accordingly. + // A) Add '#define ImDrawIdx unsigned int' in imconfig.h to raise the index size of 4 bytes. You'll need to handle the 4-bytes indices to your renderer. + // For example, the OpenGL example code detect index size at compile-time and does + // 'glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, idx_buffer_offset); + // B) If for some reason you cannot use 32-bit indices or don't want to, a workaround is to call BeginChild()/EndChild() because reaching the 64K limit to split your draw commands in multiple draw lists. IM_ASSERT((draw_list->_VtxCurrentIdx >> (sizeof(ImDrawIdx)*8)) == 0); // Too many vertices in same ImDrawList. See comment above. out_render_list.push_back(draw_list);