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From Eric Wing, add alternate backdrop implementations.

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From Robert Osfield, updated naming  and copy constructor methods.
This commit is contained in:
Robert Osfield
2006-07-18 12:24:04 +00:00
parent f2d50d943b
commit 419e185895
5 changed files with 517 additions and 81 deletions
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489
src/osgText/Text.cpp
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@@ -46,6 +46,7 @@ Text::Text():
_kerningType(KERNING_DEFAULT),
_lineCount(0),
_backdropType(NONE),
_backdropImplementation(POLYGON_OFFSET),
_backdropHorizontalOffset(0.07f),
_backdropVerticalOffset(0.07f),
_backdropColor(0.0f, 0.0f, 0.0f, 1.0f),
@@ -79,7 +80,17 @@ Text::Text(const Text& text,const osg::CopyOp& copyop):
_color(text._color),
_drawMode(text._drawMode),
_kerningType(text._kerningType),
_lineCount(text._lineCount)
_lineCount(text._lineCount),
_backdropType(text._backdropType),
_backdropImplementation(text._backdropImplementation),
_backdropHorizontalOffset(text._backdropHorizontalOffset),
_backdropVerticalOffset(text._backdropVerticalOffset),
_backdropColor(text._backdropColor),
_colorGradientMode(text._colorGradientMode),
_colorGradientTopLeft(text._colorGradientTopLeft),
_colorGradientBottomLeft(text._colorGradientBottomLeft),
_colorGradientBottomRight(text._colorGradientBottomRight),
_colorGradientTopRight(text._colorGradientTopRight)
{
computeGlyphRepresentation();
}
@@ -1446,88 +1457,35 @@ void Text::drawImplementation(osg::State& state) const
state.disableAllVertexArrays();
// Okay, since ATI's cards/drivers are not working correctly,
// we need alternative solutions to glPolygonOffset.
// So this is a pick your poison approach. Each alternative
// backend has trade-offs associated with it, but with luck,
// the user may find that works for them.
if(_backdropType != NONE)
{
if (!osg::PolygonOffset::areUnitsAndMultipliersSet())
switch(_backdropImplementation)
{
osg::PolygonOffset::setFactorAndUnitsMultipliersUsingBestGuessForDriver();
}
// Do I really need to do this for glPolygonOffset?
glPushAttrib(GL_POLYGON_OFFSET_FILL);
glEnable(GL_POLYGON_OFFSET_FILL);
}
for(TextureGlyphQuadMap::iterator titr=_textureGlyphQuadMap.begin();
titr!=_textureGlyphQuadMap.end();
++titr)
{
// need to set the texture here...
state.apply(titr->first.get());
const GlyphQuads& glyphquad = titr->second;
// For backdrop text
if(_backdropType != NONE)
{
unsigned int backdrop_index;
unsigned int max_backdrop_index;
if(_backdropType == OUTLINE)
{
backdrop_index = 0;
max_backdrop_index = 8;
}
else
{
backdrop_index = _backdropType;
max_backdrop_index = _backdropType+1;
}
state.setTexCoordPointer( 0, 2, GL_FLOAT, 0, &(glyphquad._texcoords.front()));
state.disableColorPointer();
glColor4fv(_backdropColor.ptr());
for( ; backdrop_index < max_backdrop_index; backdrop_index++)
{
const GlyphQuads::Coords3& transformedBackdropCoords = glyphquad._transformedBackdropCoords[backdrop_index][contextID];
if (!transformedBackdropCoords.empty())
{
state.setVertexPointer( 3, GL_FLOAT, 0, &(transformedBackdropCoords.front()));
glPolygonOffset(2.0f * osg::PolygonOffset::getFactorMultiplier(),
3.0f * osg::PolygonOffset::getUnitsMultiplier() * (max_backdrop_index-backdrop_index) );
glDrawArrays(GL_QUADS,0,transformedBackdropCoords.size());
}
}
glPolygonOffset(0.0f,0.0f);
} // end of backdrop text
const GlyphQuads::Coords3& transformedCoords = glyphquad._transformedCoords[contextID];
if (!transformedCoords.empty())
{
state.setVertexPointer( 3, GL_FLOAT, 0, &(transformedCoords.front()));
state.setTexCoordPointer( 0, 2, GL_FLOAT, 0, &(glyphquad._texcoords.front()));
if(_colorGradientMode == SOLID)
{
state.disableColorPointer();
glColor4fv(_color.ptr());
}
else
{
state.setColorPointer( 4, GL_FLOAT, 0, &(glyphquad._colorCoords.front()));
}
glDrawArrays(GL_QUADS,0,transformedCoords.size());
case POLYGON_OFFSET:
renderWithPolygonOffset(state);
break;
case NO_DEPTH_BUFFER:
renderWithNoDepthBuffer(state);
break;
case DEPTH_RANGE:
renderWithDepthRange(state);
break;
case STENCIL_BUFFER:
renderWithStencilBuffer(state);
break;
default:
renderWithPolygonOffset(state);
}
}
if(_backdropType != NONE)
else
{
glPopAttrib();
}
renderOnlyForegroundText(state);
}
}
if (_drawMode & BOUNDINGBOX)
@@ -1626,6 +1584,15 @@ void Text::setBackdropType(BackdropType type)
computeGlyphRepresentation();
}
void Text::setBackdropImplementation(BackdropImplementation implementation)
{
if (_backdropImplementation==implementation) return;
_backdropImplementation = implementation;
computeGlyphRepresentation();
}
void Text::setBackdropOffset(float offset)
{
_backdropHorizontalOffset = offset;
@@ -1859,7 +1826,373 @@ void Text::convertRgbToHsv( float rgb[], float hsv[] ) const
}
void Text::drawForegroundText(osg::State& state, const GlyphQuads& glyphquad) const
{
unsigned int contextID = state.getContextID();
const GlyphQuads::Coords3& transformedCoords = glyphquad._transformedCoords[contextID];
if (!transformedCoords.empty())
{
state.setVertexPointer( 3, GL_FLOAT, 0, &(transformedCoords.front()));
state.setTexCoordPointer( 0, 2, GL_FLOAT, 0, &(glyphquad._texcoords.front()));
if(_colorGradientMode == SOLID)
{
state.disableColorPointer();
glColor4fv(_color.ptr());
}
else
{
state.setColorPointer( 4, GL_FLOAT, 0, &(glyphquad._colorCoords.front()));
}
glDrawArrays(GL_QUADS,0,transformedCoords.size());
}
}
void Text::renderOnlyForegroundText(osg::State& state) const
{
for(TextureGlyphQuadMap::iterator titr=_textureGlyphQuadMap.begin();
titr!=_textureGlyphQuadMap.end();
++titr)
{
// need to set the texture here...
state.apply(titr->first.get());
const GlyphQuads& glyphquad = titr->second;
drawForegroundText(state, glyphquad);
}
}
void Text::renderWithPolygonOffset(osg::State& state) const
{
// glNormal3fv(_normal.ptr());
// state.disableAllVertexArrays();
unsigned int contextID = state.getContextID();
if (!osg::PolygonOffset::areFactorAndUnitsMultipliersSet())
{
osg::PolygonOffset::setFactorAndUnitsMultipliersUsingBestGuessForDriver();
}
// Do I really need to do this for glPolygonOffset?
glPushAttrib(GL_POLYGON_OFFSET_FILL);
glEnable(GL_POLYGON_OFFSET_FILL);
for(TextureGlyphQuadMap::iterator titr=_textureGlyphQuadMap.begin();
titr!=_textureGlyphQuadMap.end();
++titr)
{
// need to set the texture here...
state.apply(titr->first.get());
const GlyphQuads& glyphquad = titr->second;
unsigned int backdrop_index;
unsigned int max_backdrop_index;
if(_backdropType == OUTLINE)
{
backdrop_index = 0;
max_backdrop_index = 8;
}
else
{
backdrop_index = _backdropType;
max_backdrop_index = _backdropType+1;
}
state.setTexCoordPointer( 0, 2, GL_FLOAT, 0, &(glyphquad._texcoords.front()));
state.disableColorPointer();
glColor4fv(_backdropColor.ptr());
for( ; backdrop_index < max_backdrop_index; backdrop_index++)
{
const GlyphQuads::Coords3& transformedBackdropCoords = glyphquad._transformedBackdropCoords[backdrop_index][contextID];
if (!transformedBackdropCoords.empty())
{
state.setVertexPointer( 3, GL_FLOAT, 0, &(transformedBackdropCoords.front()));
glPolygonOffset(0.1f * osg::PolygonOffset::getFactorMultiplier(),
2.0f * osg::PolygonOffset::getUnitsMultiplier() * (max_backdrop_index-backdrop_index) );
glDrawArrays(GL_QUADS,0,transformedBackdropCoords.size());
}
}
// Reset the polygon offset so the foreground text is on top
glPolygonOffset(0.0f,0.0f);
drawForegroundText(state, glyphquad);
}
glPopAttrib();
}
void Text::renderWithNoDepthBuffer(osg::State& state) const
{
unsigned int contextID = state.getContextID();
glPushAttrib(GL_DEPTH_BUFFER_BIT);
glDisable(GL_DEPTH_TEST);
for(TextureGlyphQuadMap::iterator titr=_textureGlyphQuadMap.begin();
titr!=_textureGlyphQuadMap.end();
++titr)
{
// need to set the texture here...
state.apply(titr->first.get());
const GlyphQuads& glyphquad = titr->second;
unsigned int backdrop_index;
unsigned int max_backdrop_index;
if(_backdropType == OUTLINE)
{
backdrop_index = 0;
max_backdrop_index = 8;
}
else
{
backdrop_index = _backdropType;
max_backdrop_index = _backdropType+1;
}
state.setTexCoordPointer( 0, 2, GL_FLOAT, 0, &(glyphquad._texcoords.front()));
state.disableColorPointer();
glColor4fv(_backdropColor.ptr());
for( ; backdrop_index < max_backdrop_index; backdrop_index++)
{
const GlyphQuads::Coords3& transformedBackdropCoords = glyphquad._transformedBackdropCoords[backdrop_index][contextID];
if (!transformedBackdropCoords.empty())
{
state.setVertexPointer( 3, GL_FLOAT, 0, &(transformedBackdropCoords.front()));
glDrawArrays(GL_QUADS,0,transformedBackdropCoords.size());
}
}
drawForegroundText(state, glyphquad);
}
glPopAttrib();
}
// This idea comes from Paul Martz's OpenGL FAQ: 13.050
void Text::renderWithDepthRange(osg::State& state) const
{
unsigned int contextID = state.getContextID();
// Hmmm, the man page says GL_VIEWPORT_BIT for Depth range (near and far)
// but experimentally, GL_DEPTH_BUFFER_BIT for glDepthRange.
// glPushAttrib(GL_VIEWPORT_BIT);
glPushAttrib(GL_DEPTH_BUFFER_BIT);
for(TextureGlyphQuadMap::iterator titr=_textureGlyphQuadMap.begin();
titr!=_textureGlyphQuadMap.end();
++titr)
{
// need to set the texture here...
state.apply(titr->first.get());
const GlyphQuads& glyphquad = titr->second;
unsigned int backdrop_index;
unsigned int max_backdrop_index;
if(_backdropType == OUTLINE)
{
backdrop_index = 0;
max_backdrop_index = 8;
}
else
{
backdrop_index = _backdropType;
max_backdrop_index = _backdropType+1;
}
state.setTexCoordPointer( 0, 2, GL_FLOAT, 0, &(glyphquad._texcoords.front()));
state.disableColorPointer();
glColor4fv(_backdropColor.ptr());
for( ; backdrop_index < max_backdrop_index; backdrop_index++)
{
const GlyphQuads::Coords3& transformedBackdropCoords = glyphquad._transformedBackdropCoords[backdrop_index][contextID];
if (!transformedBackdropCoords.empty())
{
state.setVertexPointer( 3, GL_FLOAT, 0, &(transformedBackdropCoords.front()));
glDepthRange(0.01f + ((max_backdrop_index-backdrop_index)/1000.0f), 1.0);
glDrawArrays(GL_QUADS,0,transformedBackdropCoords.size());
}
}
glDepthRange(0.0, 0.982);
drawForegroundText(state, glyphquad);
}
glPopAttrib();
}
void Text::renderWithStencilBuffer(osg::State& state) const
{
/* Here are the steps:
* 1) Disable drawing color
* 2) Enable the stencil buffer
* 3) Draw all the text to the stencil buffer
* 4) Disable the stencil buffer
* 5) Enable color
* 6) Disable the depth buffer
* 7) Draw all the text again.
* 7b) Make sure the foreground text is drawn last if priority levels
* are the same OR
* 7c) If priority levels are different, then make sure the foreground
* text has the higher priority.
*/
unsigned int contextID = state.getContextID();
glPushAttrib(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_TEST);
// It seems I can get away without calling this here
//glClear(GL_STENCIL_BUFFER_BIT);
// enable stencil buffer
glEnable(GL_STENCIL_TEST);
// write a one to the stencil buffer everywhere we are about to draw
glStencilFunc(GL_ALWAYS, 1, 1);
// write only to the stencil buffer if we pass the depth test
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
// Disable writing to the color buffer so we only write to the stencil
// buffer and the depth buffer
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
// make sure the depth buffer is enabled
// glEnable(GL_DEPTH_TEST);
// glDepthMask(GL_TRUE);
// glDepthFunc(GL_LESS);
// Arrrgh! Why does the code only seem to work correctly if I call this?
glDepthMask(GL_FALSE);
// Draw all the text to the stencil buffer to mark out the region
// that we can write too.
for(TextureGlyphQuadMap::iterator titr=_textureGlyphQuadMap.begin();
titr!=_textureGlyphQuadMap.end();
++titr)
{
// need to set the texture here...
state.apply(titr->first.get());
const GlyphQuads& glyphquad = titr->second;
unsigned int backdrop_index;
unsigned int max_backdrop_index;
if(_backdropType == OUTLINE)
{
backdrop_index = 0;
max_backdrop_index = 8;
}
else
{
backdrop_index = _backdropType;
max_backdrop_index = _backdropType+1;
}
state.setTexCoordPointer( 0, 2, GL_FLOAT, 0, &(glyphquad._texcoords.front()));
state.disableColorPointer();
for( ; backdrop_index < max_backdrop_index; backdrop_index++)
{
const GlyphQuads::Coords3& transformedBackdropCoords = glyphquad._transformedBackdropCoords[backdrop_index][contextID];
if (!transformedBackdropCoords.empty())
{
state.setVertexPointer( 3, GL_FLOAT, 0, &(transformedBackdropCoords.front()));
glDrawArrays(GL_QUADS,0,transformedBackdropCoords.size());
}
}
// Draw the foreground text
const GlyphQuads::Coords3& transformedCoords = glyphquad._transformedCoords[contextID];
if (!transformedCoords.empty())
{
state.setVertexPointer( 3, GL_FLOAT, 0, &(transformedCoords.front()));
state.setTexCoordPointer( 0, 2, GL_FLOAT, 0, &(glyphquad._texcoords.front()));
glDrawArrays(GL_QUADS,0,transformedCoords.size());
}
}
// disable the depth buffer
// glDisable(GL_DEPTH_TEST);
// glDepthMask(GL_FALSE);
// glDepthMask(GL_TRUE);
// glDepthFunc(GL_ALWAYS);
// Set the stencil function to pass when the stencil is 1
// Bug: This call seems to have no effect. Try changing to NOTEQUAL
// and see the exact same results.
glStencilFunc(GL_EQUAL, 1, 1);
// disable writing to the stencil buffer
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glStencilMask(GL_FALSE);
// Re-enable writing to the color buffer so we can see the results
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
// Draw all the text again
for(TextureGlyphQuadMap::iterator titr=_textureGlyphQuadMap.begin();
titr!=_textureGlyphQuadMap.end();
++titr)
{
// need to set the texture here...
state.apply(titr->first.get());
const GlyphQuads& glyphquad = titr->second;
unsigned int backdrop_index;
unsigned int max_backdrop_index;
if(_backdropType == OUTLINE)
{
backdrop_index = 0;
max_backdrop_index = 8;
}
else
{
backdrop_index = _backdropType;
max_backdrop_index = _backdropType+1;
}
state.setTexCoordPointer( 0, 2, GL_FLOAT, 0, &(glyphquad._texcoords.front()));
state.disableColorPointer();
glColor4fv(_backdropColor.ptr());
for( ; backdrop_index < max_backdrop_index; backdrop_index++)
{
const GlyphQuads::Coords3& transformedBackdropCoords = glyphquad._transformedBackdropCoords[backdrop_index][contextID];
if (!transformedBackdropCoords.empty())
{
state.setVertexPointer( 3, GL_FLOAT, 0, &(transformedBackdropCoords.front()));
glDrawArrays(GL_QUADS,0,transformedBackdropCoords.size());
}
}
drawForegroundText(state, glyphquad);
}
glPopAttrib();
}