Improved clipping in GL2 paint engine.

Use the stencil method to draw clip paths and regions to the Z-buffer
instead of using glClear / glScissor. Using different depth values for
the various clip parts also makes restore() very cheap when only
IntersectClip is used.

As an additional bonus this patch gives antialiased clip in the GL 2
paint engine.

Task-number: 254658
Reviewed-by: Trond

1 files changed, 2 insertions, 1 deletions

diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
index ea57fdf..5c541d0 100644
--- a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
@@ -157,6 +157,7 @@ QGLEngineShaderManager::QGLEngineShaderManager(QGLContext* context)
     simpleShaderProg->addShader(compiledShaders[PositionOnlyVertexShader]);
     simpleShaderProg->addShader(compiledShaders[MainFragmentShader]);
     simpleShaderProg->addShader(compiledShaders[ShockingPinkSrcFragmentShader]);
+    simpleShaderProg->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
     simpleShaderProg->link();
     if (!simpleShaderProg->isLinked()) {
         qCritical() << "Errors linking simple shader:"
@@ -444,7 +445,7 @@ bool QGLEngineShaderManager::useCorrectShaderProg()
     requiredProgram.program->addShader(requiredProgram.compositionFragShader);
 
     // We have to bind the vertex attribute names before the program is linked:
-    requiredProgram.program->bindAttributeLocation("inputVertex", QT_VERTEX_COORDS_ATTR);
+    requiredProgram.program->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
     if (useTextureCoords)
         requiredProgram.program->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);