1 files changed, 241 insertions, 0 deletions
diff --git a/tests/manual/rhi/cubemap_scissor/cubemap_scissor.cpp b/tests/manual/rhi/cubemap_scissor/cubemap_scissor.cpp
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index 0000000000..25a7c64c8a
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+++ b/tests/manual/rhi/cubemap_scissor/cubemap_scissor.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// This is a test for scissoring. Based on the cubemap test (because there the
+// rendering covers the entire viewport which is what we need here). The
+// scissor rectangle moves first up, then down, then from the center to the
+// left and then to right. The important part is to ensure that the behavior
+// identical between all backends, especially when the rectangle is partly or
+// fully off window.
+
+#include "../shared/examplefw.h"
+#include "../shared/cube.h"
+
+struct {
+    QVector<QRhiResource *> releasePool;
+    QRhiBuffer *vbuf = nullptr;
+    QRhiBuffer *ubuf = nullptr;
+    QRhiTexture *tex = nullptr;
+    QRhiSampler *sampler = nullptr;
+    QRhiShaderResourceBindings *srb = nullptr;
+    QRhiGraphicsPipeline *ps = nullptr;
+    QRhiResourceUpdateBatch *initialUpdates = nullptr;
+
+    QPoint scissorBottomLeft;
+    QSize scissorSize;
+    int scissorAnimState = 0;
+    QSize outputSize;
+} d;
+
+void Window::customInit()
+{
+    d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube));
+    d.vbuf->build();
+    d.releasePool << d.vbuf;
+
+    d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64);
+    d.ubuf->build();
+    d.releasePool << d.ubuf;
+
+    const QSize cubeMapSize(512, 512);
+    d.tex = m_r->newTexture(QRhiTexture::RGBA8, cubeMapSize, 1, QRhiTexture::CubeMap);
+    d.releasePool << d.tex;
+    d.tex->build();
+
+    d.initialUpdates = m_r->nextResourceUpdateBatch();
+    d.initialUpdates->uploadStaticBuffer(d.vbuf, cube);
+
+    QImage img = QImage(":/c.png").mirrored().convertToFormat(QImage::Format_RGBA8888);
+    // just use the same image for all faces for now
+    QRhiTextureSubresourceUploadDescription subresDesc(img);
+    QRhiTextureUploadDescription desc({
+                                          { 0, 0, subresDesc },  // +X
+                                          { 1, 0, subresDesc },  // -X
+                                          { 2, 0, subresDesc },  // +Y
+                                          { 3, 0, subresDesc },  // -Y
+                                          { 4, 0, subresDesc },  // +Z
+                                          { 5, 0, subresDesc }   // -Z
+                                      });
+    d.initialUpdates->uploadTexture(d.tex, desc);
+
+    d.sampler = m_r->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
+                                QRhiSampler::Repeat, QRhiSampler::Repeat);
+    d.releasePool << d.sampler;
+    d.sampler->build();
+
+    d.srb = m_r->newShaderResourceBindings();
+    d.releasePool << d.srb;
+    d.srb->setBindings({
+        QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.ubuf),
+        QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, d.tex, d.sampler)
+    });
+    d.srb->build();
+
+    d.ps = m_r->newGraphicsPipeline();
+    d.releasePool << d.ps;
+
+    d.ps->setFlags(QRhiGraphicsPipeline::UsesScissor);
+
+    d.ps->setDepthTest(true);
+    d.ps->setDepthWrite(true);
+    d.ps->setDepthOp(QRhiGraphicsPipeline::LessOrEqual);
+
+    d.ps->setCullMode(QRhiGraphicsPipeline::Front); // we are inside the cube so cull front, not back
+    d.ps->setFrontFace(QRhiGraphicsPipeline::CCW); // front is ccw in the cube data
+
+    QShader vs = getShader(QLatin1String(":/cubemap.vert.qsb"));
+    Q_ASSERT(vs.isValid());
+    QShader fs = getShader(QLatin1String(":/cubemap.frag.qsb"));
+    Q_ASSERT(fs.isValid());
+    d.ps->setShaderStages({
+        { QRhiShaderStage::Vertex, vs },
+        { QRhiShaderStage::Fragment, fs }
+    });
+
+    QRhiVertexInputLayout inputLayout;
+    inputLayout.setBindings({
+        { 3 * sizeof(float) }
+    });
+    inputLayout.setAttributes({
+        { 0, 0, QRhiVertexInputAttribute::Float3, 0 }
+    });
+
+    d.ps->setVertexInputLayout(inputLayout);
+    d.ps->setShaderResourceBindings(d.srb);
+    d.ps->setRenderPassDescriptor(m_rp);
+
+    d.ps->build();
+
+    d.scissorAnimState = 0;
+}
+
+void Window::customRelease()
+{
+    qDeleteAll(d.releasePool);
+    d.releasePool.clear();
+}
+
+static void advanceScissor()
+{
+    switch (d.scissorAnimState) {
+    case 1: // up
+        d.scissorBottomLeft.setX(d.outputSize.width() / 4);
+        d.scissorBottomLeft.ry() += 1;
+        if (d.scissorBottomLeft.y() > d.outputSize.height() + 100)
+            d.scissorAnimState = 2;
+        break;
+    case 2: // down
+        d.scissorBottomLeft.ry() -= 1;
+        if (d.scissorBottomLeft.y() < -d.scissorSize.height() - 100)
+            d.scissorAnimState = 3;
+        break;
+    case 3: // left
+        d.scissorBottomLeft.setY(d.outputSize.height() / 4);
+        d.scissorBottomLeft.rx() += 1;
+        if (d.scissorBottomLeft.x() > d.outputSize.width() + 100)
+            d.scissorAnimState = 4;
+        break;
+    case 4: // right
+        d.scissorBottomLeft.rx() -= 1;
+        if (d.scissorBottomLeft.x() < -d.scissorSize.width() - 100)
+            d.scissorAnimState = 1;
+        break;
+    }
+
+    qDebug() << "scissor bottom-left" << d.scissorBottomLeft << "size" << d.scissorSize;
+}
+
+void Window::customRender()
+{
+    const QSize outputSizeInPixels = m_sc->currentPixelSize();
+    QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
+    QRhiResourceUpdateBatch *u = m_r->nextResourceUpdateBatch();
+
+    if (d.initialUpdates) {
+        u->merge(d.initialUpdates);
+        d.initialUpdates->release();
+        d.initialUpdates = nullptr;
+    }
+
+    d.outputSize = outputSizeInPixels;
+    if (d.scissorAnimState == 0) {
+        d.scissorBottomLeft = QPoint(outputSizeInPixels.width() / 4, 0);
+        d.scissorSize = QSize(outputSizeInPixels.width() / 2, outputSizeInPixels.height() / 2);
+        d.scissorAnimState = 1;
+    }
+
+    QMatrix4x4 mvp = m_r->clipSpaceCorrMatrix();
+    mvp.perspective(90.0f, outputSizeInPixels.width() / (float) outputSizeInPixels.height(), 0.01f, 1000.0f);
+    // cube vertices go from -1..1
+    mvp.scale(10);
+    static float rx = 0;
+    mvp.rotate(rx, 1, 0, 0);
+    rx += 0.5f;
+    // no translation
+    u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());
+
+    cb->beginPass(m_sc->currentFrameRenderTarget(), m_clearColor, { 1.0f, 0 }, u);
+    cb->setGraphicsPipeline(d.ps);
+    cb->setViewport(QRhiViewport(0, 0, outputSizeInPixels.width(), outputSizeInPixels.height()));
+
+    // Apply a scissor rectangle that moves around on the screen, also
+    // exercising the out of screen (negative x or y) case.
+    cb->setScissor(QRhiScissor(d.scissorBottomLeft.x(), d.scissorBottomLeft.y(),
+                               d.scissorSize.width(), d.scissorSize.height()));
+
+    cb->setShaderResources();
+
+    const QRhiCommandBuffer::VertexInput vbufBinding(d.vbuf, 0);
+    cb->setVertexInput(0, 1, &vbufBinding);
+    cb->draw(36);
+    cb->endPass();
+
+    advanceScissor();
+}