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2.8 branch: Backport of r11768 to improve rendering of osgText::Text objects, from Eric Sokolowsky.

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This commit is contained in:
Paul MARTZ
2011-05-24 18:41:06 +00:00
parent 3477e813d0
commit 25612d10af
2 changed files with 193 additions and 20 deletions
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26
include/osgText/Text
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@@ -62,6 +62,16 @@ public:
/**
* Turns off writing to the depth buffer when rendering text. This only affects text
* with no backdrop or text using the DELAYED_DEPTH_WRITES implementation, since
* the other backdrop implementations are really only useful for backwards
* compatibility and are not worth updating to utilize this flag.
*/
bool setEnableDepthWrites() { return _enableDepthWrites; }
void setEnableDepthWrites(bool enable) { _enableDepthWrites = enable; }
enum BackdropType
{
DROP_SHADOW_BOTTOM_RIGHT = 0, // usually the type of shadow you see
@@ -146,7 +156,17 @@ public:
* are significant on your particular hardware.) This mode is best for
* when quality is important and stencil buffer hardware acceleration
* is available.*/
STENCIL_BUFFER
STENCIL_BUFFER,
/* DELAYED_DEPTH_WRITES
* This mode renders all text with depth writes turned off, then
* again with depth writes on, but with the color buffer disabled.
* This should render text accurately for all graphics cards. The
* only downside is the additional pass to render to the depth
* buffer. But if you don't need the depth buffer updated for
* your, this extra pass can be disabled by calling
* enableDepthWrites(false).*/
DELAYED_DEPTH_WRITES
};
/**
@@ -377,12 +397,16 @@ protected:
void drawImplementation(osg::State& state, const osg::Vec4& colorMultiplier) const;
void drawForegroundText(osg::State& state, const GlyphQuads& glyphquad, const osg::Vec4& colorMultiplier) const;
void drawTextWithBackdrop(osg::State& state, const osg::Vec4& colorMultiplier) const;
void renderOnlyForegroundText(osg::State& state, const osg::Vec4& colorMultiplier) const;
void renderWithPolygonOffset(osg::State& state, const osg::Vec4& colorMultiplier) const;
void renderWithNoDepthBuffer(osg::State& state, const osg::Vec4& colorMultiplier) const;
void renderWithDepthRange(osg::State& state, const osg::Vec4& colorMultiplier) const;
void renderWithStencilBuffer(osg::State& state, const osg::Vec4& colorMultiplier) const;
void renderWithDelayedDepthWrites(osg::State& state, const osg::Vec4& colorMultiplier) const;
bool _enableDepthWrites;
BackdropType _backdropType;
BackdropImplementation _backdropImplementation;