1 files changed, 73 insertions, 0 deletions
diff --git a/src/gl/vertex_array.cc b/src/gl/vertex_array.cc
new file mode 100644
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--- /dev/null
+++ b/src/gl/vertex_array.cc
@@ -0,0 +1,73 @@
+// Copyright 2021 Benjamin Barenblat
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#include "src/gl/vertex_array.h"
+
+#include <stdint.h>
+
+#include "src/gl/error.h"
+#include "src/util.h"
+#include "third_party/abseil/absl/strings/str_cat.h"
+#include "third_party/glew/include/GL/glew.h"
+
+namespace gl {
+
+using ::gl_internal::CheckThreadSafety;
+using ::gl_internal::ErrorCheck;
+using ::gl_internal::UnnecessaryErrorCheck;
+
+void VertexArray::SetVertexAttributeFormat(int index, int size,
+                                           VertexAttributeType type, int offset,
+                                           bool normalized) {
+  CheckThreadSafety();
+
+  glEnableVertexArrayAttrib(array_, index);
+  // An error check is necessary here because the index might be too large for
+  // OpenGL to handle, but it can be folded into a future error check.
+  UnnecessaryErrorCheck();
+
+  switch (type) {
+    case VertexAttributeType::kHalfFloat:
+    case VertexAttributeType::kFloat:
+      glVertexArrayAttribFormat(array_, index, size, FromEnum(type), normalized,
+                                offset);
+      break;
+    case VertexAttributeType::kByte:
+    case VertexAttributeType::kShort:
+    case VertexAttributeType::kInt:
+    case VertexAttributeType::kFixed:
+    case VertexAttributeType::kUnsignedByte:
+    case VertexAttributeType::kUnsignedShort:
+    case VertexAttributeType::kUnsignedInt:
+    case VertexAttributeType::kInt2x10x10x10Rev:
+    case VertexAttributeType::kUnsignedInt2x10x10x10Rev:
+    case VertexAttributeType::kUnsignedInt10f11f11fRev:
+      glVertexArrayAttribIFormat(array_, index, size, FromEnum(type), offset);
+      break;
+    case VertexAttributeType::kDouble:
+      glVertexArrayAttribLFormat(array_, index, size, FromEnum(type), offset);
+      break;
+    default:
+      throw std::invalid_argument(
+          absl::StrCat("GL: invalid VertexAttributeType ", type));
+  }
+  // This error check is necessary because a wide variety of argument
+  // combinations are invalid.
+  ErrorCheck();
+
+  glVertexArrayAttribBinding(array_, index, /*bindingindex=*/0);
+  UnnecessaryErrorCheck();
+}
+
+}  // namespace gl