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Doing scissor test on CPU to avoid lots of draw calls when elements are in a long list.

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This commit is contained in:
Dario Manesku 2015-09-02 20:21:00 +02:00
parent 561b7aa793
commit 761a0d5cda
1 changed files with 22 additions and 0 deletions
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22
examples/common/imgui/imgui.cpp
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@ -1221,6 +1221,11 @@ struct Imgui
const uint32_t rgb0 = _rgb0&0x00ffffff; const uint32_t rgb0 = _rgb0&0x00ffffff;
if (!visible(yy, height, area.m_scissorY, area.m_scissorHeight))
{
return false;
}
drawRoundedRect( (float)xx drawRoundedRect( (float)xx
, (float)yy , (float)yy
, (float)width , (float)width
@ -1266,6 +1271,11 @@ struct Imgui
const bool over = enabled && inRect(xx, yy, width, height); const bool over = enabled && inRect(xx, yy, width, height);
const bool res = buttonLogic(id, over); const bool res = buttonLogic(id, over);
if (!visible(yy, height, area.m_scissorY, area.m_scissorHeight))
{
return false;
}
if (isHot(id) ) if (isHot(id) )
{ {
drawRoundedRect( (float)xx drawRoundedRect( (float)xx
@ -1316,6 +1326,12 @@ struct Imgui
const int32_t cx = xx + BUTTON_HEIGHT / 2 - CHECK_SIZE / 2; const int32_t cx = xx + BUTTON_HEIGHT / 2 - CHECK_SIZE / 2;
const int32_t cy = yy + BUTTON_HEIGHT / 2 - CHECK_SIZE / 2; const int32_t cy = yy + BUTTON_HEIGHT / 2 - CHECK_SIZE / 2;
if (!visible(cy, CHECK_SIZE+6, area.m_scissorY, area.m_scissorHeight))
{
return false;
}
drawRoundedRect( (float)cx - 3 drawRoundedRect( (float)cx - 3
, (float)cy - 3 , (float)cy - 3
, (float)CHECK_SIZE + 6 , (float)CHECK_SIZE + 6
@ -3062,6 +3078,12 @@ struct Imgui
bool m_scissorEnabled; bool m_scissorEnabled;
}; };
bool visible(int32_t _elemY, int32_t _elemHeight, int32_t _scissorY, int32_t _scissorHeight)
{
return _elemY > _scissorY
&& (_elemY+_elemHeight) < (_scissorY+_scissorHeight);
}
inline Area& getCurrentArea() inline Area& getCurrentArea()
{ {
return m_areas[m_areaId]; return m_areas[m_areaId];