From 7881773800c05c09f0e85a80c1cbb678981bd6c0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Samuel=20R=C3=B8dal?= Date: Wed, 28 Oct 2009 17:57:12 +0100 Subject: Made internal FBOs snap to power-of-two when not wasting too much space. This improves performance on certain OpenGL ES 2.0 platforms. Reviewed-by: Gunnar Sletta --- src/opengl/qpixmapdata_gl.cpp | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/src/opengl/qpixmapdata_gl.cpp b/src/opengl/qpixmapdata_gl.cpp index 83ebece..c965947 100644 --- a/src/opengl/qpixmapdata_gl.cpp +++ b/src/opengl/qpixmapdata_gl.cpp @@ -76,6 +76,19 @@ static inline int areaDiff(const QSize &size, const QGLFramebufferObject *fbo) return qAbs(size.width() * size.height() - fbo->width() * fbo->height()); } +extern int qt_next_power_of_two(int v); + +static inline QSize maybeRoundToNextPowerOfTwo(const QSize &sz) +{ +#ifdef QT_OPENGL_ES_2 + QSize rounded(qt_next_power_of_two(sz.width()), qt_next_power_of_two(sz.height())); + if (rounded.width() * rounded.height() < 1.20 * sz.width() * sz.height()) + return rounded; +#endif + return sz; +} + + QGLFramebufferObject *QGLFramebufferObjectPool::acquire(const QSize &requestSize, const QGLFramebufferObjectFormat &requestFormat) { QGLFramebufferObject *chosen = 0; @@ -106,7 +119,7 @@ QGLFramebufferObject *QGLFramebufferObjectPool::acquire(const QSize &requestSize if (sz != fboSize) { delete candidate; - candidate = new QGLFramebufferObject(sz, requestFormat); + candidate = new QGLFramebufferObject(maybeRoundToNextPowerOfTwo(sz), requestFormat); } chosen = candidate; @@ -114,7 +127,7 @@ QGLFramebufferObject *QGLFramebufferObjectPool::acquire(const QSize &requestSize } if (!chosen) { - chosen = new QGLFramebufferObject(requestSize, requestFormat); + chosen = new QGLFramebufferObject(maybeRoundToNextPowerOfTwo(requestSize), requestFormat); } if (!chosen->isValid()) { -- cgit v0.12