Add GL indirect drawing APIs

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 
@@ skipping 23 matching lines @@
     fPackFlipYSupport = false;
     fTextureUsageSupport = false;
     fTexStorageSupport = false;
     fTextureRedSupport = false;
     fImagingSupport = false;
     fVertexArrayObjectSupport = false;
     fDirectStateAccessSupport = false;
     fDebugSupport = false;
     fES2CompatibilitySupport = false;
     fMultisampleDisableSupport = false;
+    fDrawIndirectSupport = false;
+    fMultiDrawIndirectSupport = false;
+    fBaseInstanceSupport = false;
     fUseNonVBOVertexAndIndexDynamicData = false;
     fIsCoreProfile = false;
     fBindFragDataLocationSupport = false;
     fExternalTextureSupport = false;
     fRectangleTextureSupport = false;
     fTextureSwizzleSupport = false;
     fSRGBWriteControl = false;
     fRGBA8888PixelsOpsAreSlow = false;
     fPartialFBOReadIsSlow = false;
 
@@ skipping 422 matching lines @@
                 version >= GR_GL_VER(3, 2) ||
                 (ctxInfo.hasExtension("GL_ARB_draw_instanced") &&
                  ctxInfo.hasExtension("GL_ARB_instanced_arrays"));
     } else {
         fSupportsInstancedDraws =
                 version >= GR_GL_VER(3, 0) ||
                 (ctxInfo.hasExtension("GL_EXT_draw_instanced") &&
                  ctxInfo.hasExtension("GL_EXT_instanced_arrays"));
     }
 
+    if (kGL_GrGLStandard == standard) {
+        // We don't use ARB_draw_indirect because it does not support a base instance.
+        // We don't use ARB_multi_draw_indirect because it does not support GL_DRAW_INDIRECT_BUFFER.
+        fDrawIndirectSupport =
+            fMultiDrawIndirectSupport = fBaseInstanceSupport = version >= GR_GL_VER(4,3);
+    } else {
+        fDrawIndirectSupport = version >= GR_GL_VER(3,1);
+        fMultiDrawIndirectSupport = ctxInfo.hasExtension("GL_EXT_multi_draw_indirect");
+        fBaseInstanceSupport = ctxInfo.hasExtension("GL_EXT_base_instance");
+    }
+
     this->initShaderPrecisionTable(ctxInfo, gli, glslCaps);
 
     if (contextOptions.fUseShaderSwizzling) {
         fTextureSwizzleSupport = false;
     }
 
     // Requires fTextureRedSupport, fTextureSwizzleSupport, msaa support, ES compatibility have
     // already been detected.
     this->initConfigTable(ctxInfo, gli, glslCaps);
 
@@ skipping 434 matching lines @@
     r.appendf("Pack Flip Y support: %s\n", (fPackFlipYSupport ? "YES": "NO"));
 
     r.appendf("Texture Usage support: %s\n", (fTextureUsageSupport ? "YES": "NO"));
     r.appendf("Texture Storage support: %s\n", (fTexStorageSupport ? "YES": "NO"));
     r.appendf("GL_R support: %s\n", (fTextureRedSupport ? "YES": "NO"));
     r.appendf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
     r.appendf("Direct state access support: %s\n", (fDirectStateAccessSupport ? "YES": "NO"));
     r.appendf("Debug support: %s\n", (fDebugSupport ? "YES": "NO"));
     r.appendf("Multisample disable support: %s\n", (fMultisampleDisableSupport ? "YES" : "NO"));
+    r.appendf("Draw indirect support: %s\n", (fDrawIndirectSupport ? "YES" : "NO"));
+    r.appendf("Multi draw indirect support: %s\n", (fMultiDrawIndirectSupport ? "YES" : "NO"));
+    r.appendf("Base instance support: %s\n", (fBaseInstanceSupport ? "YES" : "NO"));
     r.appendf("Use non-VBO for dynamic data: %s\n",
              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
     r.appendf("SRGB write contol: %s\n", (fSRGBWriteControl ? "YES" : "NO"));
     r.appendf("RGBA 8888 pixel ops are slow: %s\n", (fRGBA8888PixelsOpsAreSlow ? "YES" : "NO"));
     r.appendf("Partial FBO read is slow: %s\n", (fPartialFBOReadIsSlow ? "YES" : "NO"));
     r.appendf("Bind uniform location support: %s\n", (fBindUniformLocationSupport ? "YES" : "NO"));
     r.appendf("External texture support: %s\n", (fExternalTextureSupport ? "YES" : "NO"));
     r.appendf("Rectangle texture support: %s\n", (fRectangleTextureSupport? "YES" : "NO"));
     r.appendf("Texture swizzle support: %s\n", (fTextureSwizzleSupport ? "YES" : "NO"));
 
@@ skipping 693 matching lines @@
         for (int j = 0; j < kExternalFormatUsageCnt; ++j) {
             SkASSERT(defaultEntry.fFormats.fExternalFormat[j] !=
                      fConfigTable[i].fFormats.fExternalFormat[j]);
         }
         SkASSERT(defaultEntry.fFormats.fExternalType != fConfigTable[i].fFormats.fExternalType);
     }
 #endif
 }
 
 void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {}