// Copyright 2017 The Dawn & Tint Authors
//
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//    this list of conditions and the following disclaimer in the documentation
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#include "src/dawn/tests/DawnTest.h"
#include "src/dawn/utils/ComboRenderPipelineDescriptor.h"
#include "src/dawn/utils/WGPUHelpers.h"

namespace dawn {
namespace {

class ViewportOrientationTests : public DawnTest {};

// Test that the pixel in viewport coordinate (-1, -1) matches texel (0, 0)
TEST_P(ViewportOrientationTests, OriginAt0x0) {
    utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(device, 2, 2);

    wgpu::ShaderModule vsModule = utils::CreateShaderModule(device, R"(
        @vertex fn main() -> @builtin(position) vec4f {
            return vec4f(-0.5, 0.5, 0.0, 1.0);
        })");

    wgpu::ShaderModule fsModule = utils::CreateShaderModule(device, R"(
        @fragment fn main() -> @location(0) vec4f {
            return vec4f(0.0, 1.0, 0.0, 1.0);
        })");

    utils::ComboRenderPipelineDescriptor descriptor;
    descriptor.vertex.module = vsModule;
    descriptor.cFragment.module = fsModule;
    descriptor.primitive.topology = wgpu::PrimitiveTopology::PointList;
    descriptor.cTargets[0].format = renderPass.colorFormat;

    wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&descriptor);

    wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
    {
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
        pass.SetPipeline(pipeline);
        pass.Draw(1);
        pass.End();
    }

    wgpu::CommandBuffer commands = encoder.Finish();
    queue.Submit(1, &commands);

    EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kGreen, renderPass.color, 0, 0);
    EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kZero, renderPass.color, 0, 1);
    EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kZero, renderPass.color, 1, 0);
    EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kZero, renderPass.color, 1, 1);
}

DAWN_INSTANTIATE_TEST(ViewportOrientationTests,
                      D3D11Backend(),
                      D3D12Backend(),
                      MetalBackend(),
                      OpenGLBackend(),
                      OpenGLESBackend(),
                      VulkanBackend(),
                      WebGPUBackend());

}  // anonymous namespace
}  // namespace dawn