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Diffstat (limited to 'src/gl/draw.cc')
-rw-r--r-- | src/gl/draw.cc | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/gl/draw.cc b/src/gl/draw.cc new file mode 100644 index 0000000..9d20fe1 --- /dev/null +++ b/src/gl/draw.cc @@ -0,0 +1,56 @@ +// Copyright 2021, 2022 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/draw.h" + +#include <assert.h> + +#include "src/gl/error.h" +#include "src/gl/vertex_array.h" +#include "src/util.h" +#include "third_party/glew/include/GL/glew.h" + +namespace gl { + +void DrawElements(const gl::VertexArray& vao, Primitive mode) { + gl_internal::CheckThreadSafety(); + + GLenum type; + switch (vao.element_buffer().element_size()) { + case 1: + type = GL_UNSIGNED_BYTE; + break; + case 2: + type = GL_UNSIGNED_SHORT; + break; + case 4: + type = GL_UNSIGNED_INT; + break; + default: + assert(false); + }; + + glDrawElements(FromEnum(mode), vao.element_buffer().size(), type, + /*indices=*/0); + // This error check is necessary because the mode could be unsupported. + gl_internal::ErrorCheck(); +} + +void SetViewport(int x, int y, int width, int height) { + gl_internal::CheckThreadSafety(); + glViewport(x, y, width, height); + gl_internal::ErrorCheck(); +} + +} // namespace gl |