Use vertex array objects on core profiles.

src/gpu/gl/GrGLVertexArray.cpp

Index: src/gpu/gl/GrGLVertexArray.cpp
===================================================================
--- src/gpu/gl/GrGLVertexArray.cpp	(revision 0)
+++ src/gpu/gl/GrGLVertexArray.cpp	(revision 0)
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrGLVertexArray.h"
+#include "GrGpuGL.h"
+
+#define GPUGL static_cast<GrGpuGL*>(this->getGpu())
+#define GL_CALL(X) GR_GL_CALL(GPUGL->glInterface(), X);
+
+void GrGLAttribArrayState::set(const GrGpuGL* gpu,
+                               int index,
+                               GrGLVertexBuffer* buffer,
+                               GrGLint size,
+                               GrGLenum type,
+                               GrGLboolean normalized,
+                               GrGLsizei stride,
+                               GrGLvoid* offset) {
+    GrAssert(index >= 0 && index < fAttribArrays.count());
+    AttribArray* array = &fAttribArrays[index];
+    if (!array->fEnableIsValid || !array->fEnabled) {
+        GR_GL_CALL(gpu->glInterface(), EnableVertexAttribArray(index));
+        array->fEnableIsValid = true;
+        array->fEnabled = true;
+    }
+    if (!array->fAttribPointerIsValid ||
+        array->fVertexBufferID != buffer->bufferID() ||
+        array->fSize != size ||
+        array->fNormalized != normalized ||
+        array->fStride != stride ||
+        array->fOffset != offset) {
+
+        buffer->bind();
+        GR_GL_CALL(gpu->glInterface(), VertexAttribPointer(index,
+                                                           size,
+                                                           type,
+                                                           normalized,
+                                                           stride,
+                                                           offset));
+        array->fAttribPointerIsValid = true;
+        array->fVertexBufferID = buffer->bufferID();
+        array->fSize = size;
+        array->fNormalized = normalized;
+        array->fStride = stride;
+        array->fOffset = offset;
+    }
+}
+
+void GrGLAttribArrayState::disableUnusedAttribArrays(const GrGpuGL* gpu, uint64_t usedMask) {
+    int count = fAttribArrays.count();
+    for (int i = 0; i < count; ++i) {
+        if (!(usedMask & 0x1)) {
+            if (!fAttribArrays[i].fEnableIsValid || fAttribArrays[i].fEnabled) {
+                GR_GL_CALL(gpu->glInterface(), DisableVertexAttribArray(i));

[robertphillips, 2013/03/06 21:00:16]

is this supposed to be true?

[bsalomon, 2013/03/06 21:32:53]

Yeah, the bool fEnabledIsValid indicates whether fEnabled is valid or not
(represents known GL state).

+                fAttribArrays[i].fEnableIsValid = true;
+                fAttribArrays[i].fEnabled = false;
+            }
+        }
+        // if the count is greater than 64 then this will become 0 and we will disable arrays 64+.
+        usedMask >>= 1;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+GrGLVertexArray::GrGLVertexArray(GrGpuGL* gpu, GrGLint id, int attribCount)
+    : GrResource(gpu, false)
+    , fID(id)
+    , fAttribArrays(attribCount)
+    , fIndexBufferIDIsValid(false) {
+}
+
+void GrGLVertexArray::onAbandon() {
+    fID = 0;
+    INHERITED::onAbandon();
+}
+
+void GrGLVertexArray::onRelease() {
+    if (0 != fID) {
+        GL_CALL(DeleteVertexArrays(1, &fID));
+        GPUGL->notifyVertexArrayDelete(fID);
+        fID = 0;
+    }
+    INHERITED::onRelease();
+}
+
+GrGLAttribArrayState* GrGLVertexArray::bind() {
+    if (0 == fID) {
+        return NULL;
+    }
+    GPUGL->bindVertexArray(fID);
+    return &fAttribArrays;
+}
+    
+GrGLAttribArrayState* GrGLVertexArray::bindWithIndexBuffer(const GrGLIndexBuffer* buffer) {
+    GrGLAttribArrayState* state = this->bind();
+    if (NULL != state && NULL != buffer) {
+        GrGLuint bufferID = buffer->bufferID();
+        if (!fIndexBufferIDIsValid || bufferID != fIndexBufferID) {
+            GL_CALL(BindBuffer(GR_GL_ELEMENT_ARRAY_BUFFER, bufferID));
+            fIndexBufferIDIsValid = true;
+            fIndexBufferID = bufferID;
+        }
+    }
+    return state;
+}
+
+void GrGLVertexArray::notifyIndexBufferDelete(GrGLuint bufferID) {
+    if (fIndexBufferIDIsValid && bufferID == fIndexBufferID) {

[robertphillips, 2013/03/06 21:00:16]

reset fIndexBufferIDIsValid too?

[bsalomon, 2013/03/06 21:32:53]

We already checked that it's true on the previous line.

+        fIndexBufferID = 0;
+    }
+ }
+
+void GrGLVertexArray::invalidateCachedState() {
+    int count = fAttribArrays.count();
+    for (int i = 0; i < count; ++i) {
+        fAttribArrays.invalidate();
+    }
+    fIndexBufferIDIsValid = false;
+}