Implement path cover with nv_path_rendering

src/gpu/gl/GrGpuGL_program.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGpuGL.h"
 
 #include "GrEffect.h"
@@ skipping 190 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 
 #define GL_CALL(X) GR_GL_CALL(this->glInterface(), X)
 
 bool GrGpuGL::flushGraphicsState(DrawType type, const GrDeviceCoordTexture* dstCopy) {
     const GrDrawState& drawState = this->getDrawState();
 
     // GrGpu::setupClipAndFlushState should have already checked this and bailed if not true.
     SkASSERT(NULL != drawState.getRenderTarget());
 
-    if (kStencilPath_DrawType == type) {
+    if (kStencilPath_DrawType == type || kDrawPath_DrawType == type) {
         const GrRenderTarget* rt = this->getDrawState().getRenderTarget();
         SkISize size;
         size.set(rt->width(), rt->height());
         this->setProjectionMatrix(drawState.getViewMatrix(), size, rt->origin());
-    } else {
+    }
+
+    if (kStencilPath_DrawType != type) {

[Chris Dalton, 2013/09/13 19:49:58]

Kimmo, we should be able to leave this function as-is, except perhaps for an
assert:

  SkASSERT(kDrawPath_DrawType != type || !fCurrentProgram->hasVertexShader());

When there isn't a vertex shader, fCurrentProgram->setData updates the
projection matrix already.

[Kimmo Kinnunen, 2013/09/18 07:52:38]

But sometimes gpu draw path is selected when the program has vertex shader. We
will still stencil the path with gpu path stencil func. This needs the proper
projection matrix.

[Chris Dalton, 2013/09/23 02:05:59]

When does it use kDrawPath_DrawType with a vertex shader? The intention is to
never do that, so if there are any cases where that happens we need to fix it.

[bsalomon, 2013/10/08 14:05:08]

agreed.

         this->flushMiscFixedFunctionState();
 
         GrBlendCoeff srcCoeff;
         GrBlendCoeff dstCoeff;
         GrDrawState::BlendOptFlags blendOpts = drawState.getBlendOpts(false, &srcCoeff, &dstCoeff);
         if (GrDrawState::kSkipDraw_BlendOptFlag & blendOpts) {
             return false;
         }
 
         SkSTArray<8, const GrEffectStage*, true> colorStages;
@@ skipping 136 matching lines @@
                              GrGLAttribTypeToLayout(attribType).fType,
                              GrGLAttribTypeToLayout(attribType).fNormalized,
                              stride,
                              reinterpret_cast<GrGLvoid*>(
                              vertexOffsetInBytes + vertexAttrib->fOffset));
         }
 
         attribState->disableUnusedArrays(this, usedAttribArraysMask, false);
     }
 }