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Improve Stencil Playground test #43641

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Jul 13, 2023
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Improve Stencil Playground test #43641

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72 changes: 67 additions & 5 deletions impeller/renderer/renderer_unittests.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "flutter/fml/logging.h"
#include "flutter/testing/testing.h"
#include "impeller/base/strings.h"
#include "impeller/core/device_buffer_descriptor.h"
Expand Down Expand Up @@ -1046,6 +1047,54 @@ TEST_P(RendererTest, VertexBufferBuilder) {
ASSERT_EQ(vertex_builder.GetVertexCount(), 4u);
}

class CompareFunctionUIData {
public:
CompareFunctionUIData() {
labels_.push_back("Never");
functions_.push_back(CompareFunction::kNever);
labels_.push_back("Always");
functions_.push_back(CompareFunction::kAlways);
labels_.push_back("Less");
functions_.push_back(CompareFunction::kLess);
labels_.push_back("Equal");
functions_.push_back(CompareFunction::kEqual);
labels_.push_back("LessEqual");
functions_.push_back(CompareFunction::kLessEqual);
labels_.push_back("Greater");
functions_.push_back(CompareFunction::kGreater);
labels_.push_back("NotEqual");
functions_.push_back(CompareFunction::kNotEqual);
labels_.push_back("GreaterEqual");
functions_.push_back(CompareFunction::kGreaterEqual);
assert(labels_.size() == functions_.size());
}

const char* const* labels() const { return &labels_[0]; }

int size() const { return labels_.size(); }

int IndexOf(CompareFunction func) const {
for (size_t i = 0; i < functions_.size(); i++) {
if (functions_[i] == func) {
return i;
}
}
FML_UNREACHABLE();
return -1;
}

CompareFunction FunctionOf(int index) const { return functions_[index]; }

private:
std::vector<const char*> labels_;
std::vector<CompareFunction> functions_;
};

static const CompareFunctionUIData& CompareFunctionUI() {
static CompareFunctionUIData data;
return data;
}

TEST_P(RendererTest, StencilMask) {
using VS = BoxFadeVertexShader;
using FS = BoxFadeFragmentShader;
Expand Down Expand Up @@ -1083,6 +1132,10 @@ TEST_P(RendererTest, StencilMask) {
static int stencil_reference_read = 0x1;
std::vector<uint8_t> stencil_contents;
static int last_stencil_contents_reference_value = 0;
static int current_front_compare =
CompareFunctionUI().IndexOf(CompareFunction::kLessEqual);
static int current_back_compare =
CompareFunctionUI().IndexOf(CompareFunction::kLessEqual);
Renderer::RenderCallback callback = [&](RenderTarget& render_target) {
auto buffer = context->CreateCommandBuffer();
if (!buffer) {
Expand Down Expand Up @@ -1133,11 +1186,20 @@ TEST_P(RendererTest, StencilMask) {
0xFF);
ImGui::SliderInt("Stencil Compare Value", &stencil_reference_read, 0,
0xFF);
ImGui::Checkbox("Mirror", &mirror);
ImGui::Checkbox("Back face mode", &mirror);
ImGui::ListBox("Front face compare function", &current_front_compare,
CompareFunctionUI().labels(), CompareFunctionUI().size());
ImGui::ListBox("Back face compare function", &current_back_compare,
CompareFunctionUI().labels(), CompareFunctionUI().size());
ImGui::End();
StencilAttachmentDescriptor front_and_back;
front_and_back.stencil_compare = CompareFunction::kLessEqual;
desc->SetStencilAttachmentDescriptors(front_and_back);

StencilAttachmentDescriptor front;
front.stencil_compare =
CompareFunctionUI().FunctionOf(current_front_compare);
StencilAttachmentDescriptor back;
back.stencil_compare =
CompareFunctionUI().FunctionOf(current_back_compare);
desc->SetStencilAttachmentDescriptors(front, back);
auto pipeline = context->GetPipelineLibrary()->GetPipeline(desc).Get();

assert(pipeline && pipeline->IsValid());
Expand All @@ -1153,7 +1215,7 @@ TEST_P(RendererTest, StencilMask) {
uniforms.mvp = Matrix::MakeOrthographic(pass->GetRenderTargetSize()) *
Matrix::MakeScale(GetContentScale());
if (mirror) {
uniforms.mvp = Matrix::MakeScale(Vector2(-1, -1)) * uniforms.mvp;
uniforms.mvp = Matrix::MakeScale(Vector2(-1, 1)) * uniforms.mvp;
}
VS::BindUniformBuffer(
cmd, pass->GetTransientsBuffer().EmplaceUniform(uniforms));
Expand Down