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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "Qt3DSCommonPrecompile.h"
#include "scenecameraglwidget.h"
#include "StudioApp.h"
#include "IStudioRenderer.h"
#include "WGLRenderContext.h"
#include "StudioPreferences.h"
#include <QtGui/qopenglshaderprogram.h>
#include <QtGui/qopengltexture.h>
#include <QtGui/qopenglbuffer.h>
#include <QtGui/qopenglvertexarrayobject.h>
const QVector4D defaultTextureOffset = QVector4D(0.0f, 0.0f, 1.0f, 1.0f);
const QVector2D defaultGeometryOffset = QVector2D(1.0f, 1.0f);
SceneCameraGlWidget::SceneCameraGlWidget(QWidget *parent)
: QOpenGLWidget(parent)
, m_textureOffset(defaultTextureOffset)
, m_geometryOffset(defaultGeometryOffset)
{
QSurfaceFormat format; // TODO get proper format, old: = CWGLRenderContext::selectSurfaceFormat(this);
format.setSamples(1); // We want pixel perfect view, not aliased one
setFormat(format);
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
}
SceneCameraGlWidget::~SceneCameraGlWidget()
{
cleanup();
}
void SceneCameraGlWidget::initializeGL()
{
initializeOpenGLFunctions();
QObject::connect(context(), &QOpenGLContext::aboutToBeDestroyed,
this, &SceneCameraGlWidget::cleanup);
m_program = new QOpenGLShaderProgram();
if (!m_program->addShaderFromSourceCode(
QOpenGLShader::Vertex,
"#version 330 core\n"
"in vec2 vertexPos;\n"
"in vec2 vertexTexCoord;\n"
"uniform vec4 uTexOffset;\n"
"uniform vec4 uGeomOffset;\n"
"out vec2 texCoord;\n"
"void main(void)\n"
"{\n"
" gl_Position = vec4(uGeomOffset.xy + vertexPos * uGeomOffset.zw, 0.0, 1.0);\n"
" texCoord = vec2(uTexOffset.z * vertexTexCoord.x + uTexOffset.x,\n"
" uTexOffset.w * vertexTexCoord.y + uTexOffset.y);\n"
"}")) {
qWarning() << __FUNCTION__ << "Failed to add vertex shader for scene camera preview";
return;
}
if (!m_program->addShaderFromSourceCode(
QOpenGLShader::Fragment,
"#version 330 core\n"
"in vec2 texCoord;\n"
"uniform sampler2D uSampler;\n"
"out vec4 fragColor;\n"
"void main(void) {\n"
" vec4 oc = texture(uSampler, texCoord);\n"
" fragColor = vec4(oc);\n"
"}")) {
qWarning() << __FUNCTION__ << "Failed to add fragment shader for scene camera preview";
return;
}
if (!m_program->link()) {
qWarning() << __FUNCTION__ << "Failed to link program for scene camera preview";
return;
}
if (!m_program->bind()) {
qWarning() << __FUNCTION__ << "Failed to bind program for scene camera preview";
return;
} else {
GLint vertexAtt = GLint(m_program->attributeLocation("vertexPos"));
GLint uvAtt = GLint(m_program->attributeLocation("vertexTexCoord"));
m_uniformTextureOffset = GLint(m_program->uniformLocation("uTexOffset"));
m_uniformGeometryOffset = GLint(m_program->uniformLocation("uGeomOffset"));
m_program->setUniformValue("uSampler", 0);
m_vao = new QOpenGLVertexArrayObject;
if (m_vao->create()) {
m_vao->bind();
m_vertexBuffer = new QOpenGLBuffer(QOpenGLBuffer::VertexBuffer);
if (m_vertexBuffer->create() && m_vertexBuffer->bind()) {
GLfloat vertexBuffer[] = {-1.0f, 1.0f,
-1.0f, -1.0f,
1.0f, 1.0f,
1.0f, -1.0f};
m_vertexBuffer->allocate(vertexBuffer, 8 * sizeof(GLfloat));
glEnableVertexAttribArray(vertexAtt);
glVertexAttribPointer(vertexAtt, 2, GL_FLOAT, GL_FALSE, 0, (void *)0);
} else {
qWarning() << __FUNCTION__
<< "Failed to create/bind vertex buffer for scene camera preview";
return;
}
m_uvBuffer = new QOpenGLBuffer(QOpenGLBuffer::VertexBuffer);
if (m_uvBuffer->create() && m_uvBuffer->bind()) {
GLfloat uvBuffer[] = {0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 1.0f,
1.0f, 0.0f};
m_uvBuffer->allocate(uvBuffer, 8 * sizeof(GLfloat));
glEnableVertexAttribArray(uvAtt);
glVertexAttribPointer(uvAtt, 2, GL_FLOAT, GL_FALSE, 0, (void *)0);
} else {
qWarning() << __FUNCTION__
<< "Failed to create/bind UV buffer for scene camera preview";
return;
}
m_vao->release();
} else {
qWarning() << __FUNCTION__ << "Failed to create/bind vertex array object";
return;
}
}
const QColor matteColor = CStudioPreferences::matteColor();
glClearColor(matteColor.redF(), matteColor.greenF(), matteColor.blueF(), 1.0f);
}
void SceneCameraGlWidget::paintGL()
{
Q3DStudio::IStudioRenderer &renderer(g_StudioApp.getRenderer());
if (renderer.IsInitialized()) {
m_vao->bind();
glDisable(GL_DEPTH_TEST);
glDisable(GL_STENCIL_TEST);
glDisable(GL_SCISSOR_TEST);
glDisable(GL_BLEND);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
QSize fboSize;
qt3ds::QT3DSU32 textureId;
renderer.getPreviewFbo(fboSize, textureId);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, GLuint(textureId));
m_program->setUniformValueArray(m_uniformTextureOffset, &m_textureOffset, 1);
m_program->setUniformValueArray(m_uniformGeometryOffset, &m_geometryOffset, 1);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
m_vao->release();
}
}
void SceneCameraGlWidget::resizeGL(int, int)
{
// We need to update immediately to avoid flicker
update();
}
void SceneCameraGlWidget::cleanup()
{
makeCurrent();
delete m_program;
delete m_vertexBuffer;
delete m_uvBuffer;
delete m_vao;
m_program = nullptr;
m_vertexBuffer = nullptr;
m_uvBuffer = nullptr;
m_vao = nullptr;
m_uniformTextureOffset = 0;
m_uniformGeometryOffset = 0;
m_textureOffset = defaultTextureOffset;
m_geometryOffset = defaultGeometryOffset;
doneCurrent();
}
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