Add test configs for instanced rendering

Adds the following configs and enables them on select bots:

  glinst, glinst4, glinstdit4, glinst16, glinstdit16,
  esinst, esinst4, esinstdit4

Makes general changes to GrContextOptions, GrCaps, etc. to facilitate
this.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2182783004

Review-Url: https://codereview.chromium.org/2182783004

2 files changed, 24 insertions, 1 deletions

diff --git a/include/gpu/GrCaps.h b/include/gpu/GrCaps.h
index 5086d79be9..0f39a5e485 100644
--- a/include/gpu/GrCaps.h
+++ b/include/gpu/GrCaps.h
@@ -174,6 +174,21 @@ public:
     bool preferVRAMUseOverFlushes() const { return fPreferVRAMUseOverFlushes; }
 
     /**
+     * Indicates the level of support for gr_instanced::* functionality. A higher level includes
+     * all functionality from the levels below it.
+     */
+    enum class InstancedSupport {
+        kNone,
+        kBasic,
+        kMultisampled,
+        kMixedSampled
+    };
+
+    InstancedSupport instancedSupport() const { return fInstancedSupport; }
+
+    bool avoidInstancedDrawsToFPTargets() const { return fAvoidInstancedDrawsToFPTargets; }
+
+    /**
      * Indicates the capabilities of the fixed function blend unit.
      */
     enum BlendEquationSupport {
@@ -307,12 +322,15 @@ protected:
     bool fUseDrawInsteadOfClear                      : 1;
     bool fUseDrawInsteadOfPartialRenderTargetWrite   : 1;
     bool fUseDrawInsteadOfAllRenderTargetWrites      : 1;
+    bool fAvoidInstancedDrawsToFPTargets             : 1;
 
     // ANGLE workaround
     bool fPreferVRAMUseOverFlushes                   : 1;
 
     bool fSampleShadingSupport                       : 1;
 
+    InstancedSupport fInstancedSupport;
+
     BlendEquationSupport fBlendEquationSupport;
     uint32_t fAdvBlendEqBlacklist;
     GR_STATIC_ASSERT(kLast_GrBlendEquation < 32);
diff --git a/include/gpu/GrContextOptions.h b/include/gpu/GrContextOptions.h
index d5923a3280..b274895a37 100644
--- a/include/gpu/GrContextOptions.h
+++ b/include/gpu/GrContextOptions.h
@@ -24,7 +24,8 @@ struct GrContextOptions {
         , fMaxBatchLookback(-1)
         , fMaxBatchLookahead(-1)
         , fUseShaderSwizzling(false)
-        , fDoManualMipmapping(false) {}
+        , fDoManualMipmapping(false)
+        , fEnableInstancedRendering(false) {}
 
     // Suppress prints for the GrContext.
     bool fSuppressPrints;
@@ -73,6 +74,10 @@ struct GrContextOptions {
         the driver's implementation (glGenerateMipmap) contains bugs. This requires mipmap
         level and LOD control (ie desktop or ES3). */
     bool fDoManualMipmapping;
+
+    /** Enable instanced rendering as long as all required functionality is supported by the HW.
+        Instanced rendering is still experimental at this point and disabled by default. */
+    bool fEnableInstancedRendering;
 };
 
 #endif