Create GrCommandBuilder

src/gpu/GrCommandBuilder.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrCommandBuilder.h"
+
+#include "GrColor.h"
+#include "GrInOrderDrawBuffer.h"
+#include "GrTemplates.h"
+#include "SkPoint.h"
+
+static bool path_fill_type_is_winding(const GrStencilSettings& pathStencilSettings) {
+    static const GrStencilSettings::Face pathFace = GrStencilSettings::kFront_Face;
+    bool isWinding = kInvert_StencilOp != pathStencilSettings.passOp(pathFace);
+    if (isWinding) {
+        // Double check that it is in fact winding.
+        SkASSERT(kIncClamp_StencilOp == pathStencilSettings.passOp(pathFace));
+        SkASSERT(kIncClamp_StencilOp == pathStencilSettings.failOp(pathFace));
+        SkASSERT(0x1 != pathStencilSettings.writeMask(pathFace));
+        SkASSERT(!pathStencilSettings.isTwoSided());
+    }
+    return isWinding;
+}
+
+GrTargetCommands::Cmd* GrCommandBuilder::recordDrawBatch(State* state, GrBatch* batch) {
+    // Check if there is a Batch Draw we can batch with
+    if (!this->cmdBuffer()->empty() &&
+        Cmd::kDrawBatch_CmdType == this->cmdBuffer()->back().type()) {
+        DrawBatch* previous = static_cast<DrawBatch*>(&this->cmdBuffer()->back());
+        if (previous->fState == state && previous->fBatch->combineIfPossible(batch)) {
+            return NULL;
+        }
+    }
+
+    return GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), DrawBatch, (state, batch,
+                                                                    this->batchTarget()));
+}
+
+GrTargetCommands::Cmd*
+GrCommandBuilder::recordStencilPath(const GrPipelineBuilder& pipelineBuilder,
+                                    const GrPathProcessor* pathProc,
+                                    const GrPath* path,
+                                    const GrScissorState& scissorState,
+                                    const GrStencilSettings& stencilSettings) {
+    StencilPath* sp = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), StencilPath,
+                                               (path, pipelineBuilder.getRenderTarget()));
+
+    sp->fScissor = scissorState;
+    sp->fUseHWAA = pipelineBuilder.isHWAntialias();
+    sp->fViewMatrix = pathProc->viewMatrix();
+    sp->fStencil = stencilSettings;
+    return sp;
+}
+
+GrTargetCommands::Cmd*
+GrCommandBuilder::recordDrawPath(State* state,
+                                 const GrPathProcessor* pathProc,
+                                 const GrPath* path,
+                                 const GrStencilSettings& stencilSettings) {
+    DrawPath* dp = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), DrawPath, (state, path));
+    dp->fStencilSettings = stencilSettings;
+    return dp;
+}
+
+GrTargetCommands::Cmd*
+GrCommandBuilder::recordDrawPaths(State* state,
+                                  GrInOrderDrawBuffer* iodb,
+                                  const GrPathProcessor* pathProc,
+                                  const GrPathRange* pathRange,
+                                  const void* indexValues,
+                                  GrDrawTarget::PathIndexType indexType,
+                                  const float transformValues[],
+                                  GrDrawTarget::PathTransformType transformType,
+                                  int count,
+                                  const GrStencilSettings& stencilSettings,
+                                  const GrDrawTarget::PipelineInfo& pipelineInfo) {
+    SkASSERT(pathRange);
+    SkASSERT(indexValues);
+    SkASSERT(transformValues);
+
+    char* savedIndices;
+    float* savedTransforms;
+
+    iodb->appendIndicesAndTransforms(indexValues, indexType,
+                                     transformValues, transformType,
+                                     count, &savedIndices, &savedTransforms);
+
+    if (!this->cmdBuffer()->empty() &&
+        Cmd::kDrawPaths_CmdType == this->cmdBuffer()->back().type()) {
+        // The previous command was also DrawPaths. Try to collapse this call into the one
+        // before. Note that stenciling all the paths at once, then covering, may not be
+        // equivalent to two separate draw calls if there is overlap. Blending won't work,
+        // and the combined calls may also cancel each other's winding numbers in some
+        // places. For now the winding numbers are only an issue if the fill is even/odd,
+        // because DrawPaths is currently only used for glyphs, and glyphs in the same
+        // font tend to all wind in the same direction.
+        DrawPaths* previous = static_cast<DrawPaths*>(&this->cmdBuffer()->back());
+        if (pathRange == previous->pathRange() &&
+            indexType == previous->fIndexType &&
+            transformType == previous->fTransformType &&
+            stencilSettings == previous->fStencilSettings &&
+            path_fill_type_is_winding(stencilSettings) &&
+            !pipelineInfo.willBlendWithDst(pathProc) &&
+            previous->fState == state) {
+                const int indexBytes = GrPathRange::PathIndexSizeInBytes(indexType);
+                const int xformSize = GrPathRendering::PathTransformSize(transformType);
+                if (&previous->fIndices[previous->fCount*indexBytes] == savedIndices &&
+                    (0 == xformSize ||
+                     &previous->fTransforms[previous->fCount*xformSize] == savedTransforms)) {
+                    // Fold this DrawPaths call into the one previous.
+                    previous->fCount += count;
+                    return NULL;
+                }
+        }
+    }
+
+    DrawPaths* dp = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), DrawPaths, (state, pathRange));
+    dp->fIndices = savedIndices;
+    dp->fIndexType = indexType;
+    dp->fTransforms = savedTransforms;
+    dp->fTransformType = transformType;
+    dp->fCount = count;
+    dp->fStencilSettings = stencilSettings;
+    return dp;
+}
+
+GrTargetCommands::Cmd* GrCommandBuilder::recordClear(const SkIRect* rect,
+                                                     GrColor color,
+                                                     bool canIgnoreRect,
+                                                     GrRenderTarget* renderTarget) {
+    SkASSERT(renderTarget);
+
+    SkIRect r;
+    if (NULL == rect) {
+        // We could do something smart and remove previous draws and clears to
+        // the current render target. If we get that smart we have to make sure
+        // those draws aren't read before this clear (render-to-texture).
+        r.setLTRB(0, 0, renderTarget->width(), renderTarget->height());
+        rect = &r;
+    }
+    Clear* clr = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), Clear, (renderTarget));
+    GrColorIsPMAssert(color);
+    clr->fColor = color;
+    clr->fRect = *rect;
+    clr->fCanIgnoreRect = canIgnoreRect;
+    return clr;
+}
+
+GrTargetCommands::Cmd* GrCommandBuilder::recordClearStencilClip(const SkIRect& rect,
+                                                                bool insideClip,
+                                                                GrRenderTarget* renderTarget) {
+    SkASSERT(renderTarget);
+
+    ClearStencilClip* clr = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(),
+                                                     ClearStencilClip,
+                                                     (renderTarget));
+    clr->fRect = rect;
+    clr->fInsideClip = insideClip;
+    return clr;
+}
+
+GrTargetCommands::Cmd* GrCommandBuilder::recordDiscard(GrRenderTarget* renderTarget) {
+    SkASSERT(renderTarget);
+
+    Clear* clr = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), Clear, (renderTarget));
+    clr->fColor = GrColor_ILLEGAL;
+    return clr;
+}
+
+GrTargetCommands::Cmd* GrCommandBuilder::recordCopySurface(GrSurface* dst,
+                                                           GrSurface* src,
+                                                           const SkIRect& srcRect,
+                                                           const SkIPoint& dstPoint) {
+    CopySurface* cs = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), CopySurface, (dst, src));
+    cs->fSrcRect = srcRect;
+    cs->fDstPoint = dstPoint;
+    return cs;
+}
+
+GrTargetCommands::Cmd*
+GrCommandBuilder::recordXferBarrierIfNecessary(const GrPipeline& pipeline,
+                                               const GrDrawTargetCaps& caps) {
+    const GrXferProcessor& xp = *pipeline.getXferProcessor();
+    GrRenderTarget* rt = pipeline.getRenderTarget();
+
+    GrXferBarrierType barrierType;
+    if (!xp.willNeedXferBarrier(rt, caps, &barrierType)) {
+        return NULL;
+    }
+
+    XferBarrier* xb = GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), XferBarrier, ());
+    xb->fBarrierType = barrierType;
+    return xb;
+}