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Don't use GL_REPEAT for image-brush drawing on OpenGL ES2 

Backport of commit 8dfeb1c374 in QtGui
to the same class in the QtOpenGL module.

OpenGL ES2 doesn't support NPOT textures in combination with GL_REPEAT,
so for OpenGL ES2 we use a custom program that emulates repeat by taking
the fractional part of the texture coordinates.

This is not enough though, as merely setting GL_TEXTURE_WRAP_x to GL_REPEAT
with a NPOT texture is an error in some implementations, so we have to
guard the call to updateTextureFilter() in updateBrushTexture() with
a check for OpenGL ES2 and use GL_CLAMP_TO_EDGE instead.

Change-Id: Icbdd784c2c6d562849679f87da18b20d5441f389
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
bb10
Allan Sandfeld Jensen 2014-04-23 15:20:33 +02:00 committed by The Qt Project
parent 8369f6d3ea
commit 8ab1323842
1 changed files with 9 additions and 1 deletions
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10
src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
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@ -223,11 +223,19 @@ void QGL2PaintEngineExPrivate::updateBrushTexture()
if (currentBrushPixmap.width() > max_texture_size || currentBrushPixmap.height() > max_texture_size)
currentBrushPixmap = currentBrushPixmap.scaled(max_texture_size, max_texture_size, Qt::KeepAspectRatio);
GLuint wrapMode = GL_REPEAT;
if (ctx->contextHandle()->isES()) {
// OpenGL ES does not support GL_REPEAT wrap modes for NPOT textures. So instead,
// we emulate GL_REPEAT by only taking the fractional part of the texture coords
// in the qopenglslTextureBrushSrcFragmentShader program.
wrapMode = GL_CLAMP_TO_EDGE;
}
funcs.glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
QGLTexture *tex = ctx->d_func()->bindTexture(currentBrushPixmap, GL_TEXTURE_2D, GL_RGBA,
QGLContext::InternalBindOption |
QGLContext::CanFlipNativePixmapBindOption);
updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, q->state()->renderHints & QPainter::SmoothPixmapTransform);
updateTextureFilter(GL_TEXTURE_2D, wrapMode, q->state()->renderHints & QPainter::SmoothPixmapTransform);
textureInvertedY = tex->options & QGLContext::InvertedYBindOption ? -1 : 1;
}
brushTextureDirty = false;