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Implement Culling and FrontFace

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This patch implements Culling and FrontFace on backends, and add tests too.

This test also verified that we couldn't invert FrontFace on Metal backend.
Otherwise, the tests would fail on all HWs.

But we do need to invert CCW/CW on OpenGL backend. Because Y axis is up in
OpenGL while Y axis is down in WebGPU.

Bug=dawn:43

Change-Id: I7dd0922477397a13c5f7208e104ff352a673a556
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/8420
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Yunchao He <yunchao.he@intel.com>
This commit is contained in:
Yunchao He
2019-07-06 00:11:10 +00:00
committed by Commit Bot service account
parent c6d2d8e8fb
commit d2631f86e7
6 changed files with 187 additions and 7 deletions
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19
src/dawn_native/opengl/RenderPipelineGL.cpp
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@@ -40,6 +40,23 @@ namespace dawn_native { namespace opengl {
}
}
void ApplyFrontFaceAndCulling(const OpenGLFunctions& gl,
dawn::FrontFace face,
dawn::CullMode mode) {
if (mode == dawn::CullMode::None) {
gl.Disable(GL_CULL_FACE);
} else {
gl.Enable(GL_CULL_FACE);
// Note that we invert winding direction in OpenGL. Because Y axis is up in OpenGL,
// which is different from WebGPU and other backends (Y axis is down).
GLenum direction = (face == dawn::FrontFace::CCW) ? GL_CW : GL_CCW;
gl.FrontFace(direction);
GLenum cullMode = (mode == dawn::CullMode::Front) ? GL_FRONT : GL_BACK;
gl.CullFace(cullMode);
}
}
GLenum GLBlendFactor(dawn::BlendFactor factor, bool alpha) {
switch (factor) {
case dawn::BlendFactor::Zero:
@@ -236,6 +253,8 @@ namespace dawn_native { namespace opengl {
ASSERT(mVertexArrayObject);
gl.BindVertexArray(mVertexArrayObject);
ApplyFrontFaceAndCulling(gl, GetFrontFace(), GetCullMode());
ApplyDepthStencilState(gl, GetDepthStencilStateDescriptor(), &persistentPipelineState);
for (uint32_t attachmentSlot : IterateBitSet(GetColorAttachmentsMask())) {