Validate bound buffer for draw calls

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
index f8311fab654685130123812ad0743ced7e5d4cf9..81cc8b5980bff7115d1aac95b4ec6d9b8e9a2c95 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
@@ -2184,6 +2184,7 @@ void WebGLRenderingContextBase::disableVertexAttribArray(GLuint index)
         return;
     }
 
+    m_boundVertexArrayObject->setAttribEnabled(index, false);
     contextGL()->DisableVertexAttribArray(index);
 }
 
@@ -2216,6 +2217,11 @@ void WebGLRenderingContextBase::drawArrays(GLenum mode, GLint first, GLsizei cou
     if (!validateDrawArrays("drawArrays"))
         return;
 
+    if (!m_boundVertexArrayObject->isAllEnabledAttribBufferBound()) {
+        synthesizeGLError(GL_INVALID_OPERATION, "drawArrays", "no buffer is bound to enabled attribute");
+        return;
+    }
+
     ScopedRGBEmulationColorMask emulationColorMask(contextGL(), m_colorMask, m_drawingBuffer.get());
     clearIfComposited();
     contextGL()->DrawArrays(mode, first, count);
@@ -2227,6 +2233,11 @@ void WebGLRenderingContextBase::drawElements(GLenum mode, GLsizei count, GLenum
     if (!validateDrawElements("drawElements", type, offset))
         return;
 
+    if (!m_boundVertexArrayObject->isAllEnabledAttribBufferBound()) {
+        synthesizeGLError(GL_INVALID_OPERATION, "drawElements", "no buffer is bound to enabled attribute");
+        return;
+    }
+
     if (transformFeedbackActive() && !transformFeedbackPaused()) {
         synthesizeGLError(GL_INVALID_OPERATION, "drawElements", "transform feedback is active and not paused");
         return;
@@ -2243,6 +2254,11 @@ void WebGLRenderingContextBase::drawArraysInstancedANGLE(GLenum mode, GLint firs
     if (!validateDrawArrays("drawArraysInstancedANGLE"))
         return;
 
+    if (!m_boundVertexArrayObject->isAllEnabledAttribBufferBound()) {
+        synthesizeGLError(GL_INVALID_OPERATION, "drawArraysInstancedANGLE", "no buffer is bound to enabled attribute");
+        return;
+    }
+
     ScopedRGBEmulationColorMask emulationColorMask(contextGL(), m_colorMask, m_drawingBuffer.get());
     clearIfComposited();
     contextGL()->DrawArraysInstancedANGLE(mode, first, count, primcount);
@@ -2254,6 +2270,11 @@ void WebGLRenderingContextBase::drawElementsInstancedANGLE(GLenum mode, GLsizei
     if (!validateDrawElements("drawElementsInstancedANGLE", type, offset))
         return;
 
+    if (!m_boundVertexArrayObject->isAllEnabledAttribBufferBound()) {
+        synthesizeGLError(GL_INVALID_OPERATION, "drawElementsInstancedANGLE", "no buffer is bound to enabled attribute");
+        return;
+    }
+
     ScopedRGBEmulationColorMask emulationColorMask(contextGL(), m_colorMask, m_drawingBuffer.get());
     clearIfComposited();
     contextGL()->DrawElementsInstancedANGLE(mode, count, type, reinterpret_cast<void*>(static_cast<intptr_t>(offset)), primcount);
@@ -2285,6 +2306,7 @@ void WebGLRenderingContextBase::enableVertexAttribArray(GLuint index)
         return;
     }
 
+    m_boundVertexArrayObject->setAttribEnabled(index, true);
     contextGL()->EnableVertexAttribArray(index);
 }