From 6e28e8441b698c3397c2c78125c877f2e9867cb1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Samuel=20R=C3=B8dal?= <samuel.rodal@nokia.com>
Date: Mon, 22 Aug 2011 10:49:28 +0200
Subject: Copy core GL functionality to QtGui with QGL -> QOpenGL naming.

Change-Id: Ibc989afa4a30dd184d41d1a1cd89f97196e48855
Reviewed-on: http://codereview.qt.nokia.com/3710
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>
---
 examples/opengl/paintedwindow/paintedwindow.cpp | 124 ++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 examples/opengl/paintedwindow/paintedwindow.cpp

(limited to 'examples/opengl/paintedwindow/paintedwindow.cpp')

diff --git a/examples/opengl/paintedwindow/paintedwindow.cpp b/examples/opengl/paintedwindow/paintedwindow.cpp
new file mode 100644
index 0000000000..b9ecac1293
--- /dev/null
+++ b/examples/opengl/paintedwindow/paintedwindow.cpp
@@ -0,0 +1,124 @@
+#include "paintedwindow.h"
+
+#include <QOpenGLContext>
+#include <QOpenGLFunctions>
+#include <QPainter>
+#include <QTimer>
+
+#include <qmath.h>
+
+PaintedWindow::PaintedWindow()
+    : m_fbo(0)
+{
+    QSurfaceFormat format;
+    format.setStencilBufferSize(8);
+
+    setSurfaceType(QWindow::OpenGLSurface);
+    setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint);
+    setFormat(format);
+
+    create();
+
+    m_context = new QOpenGLContext(this);
+    m_context->setFormat(format);
+    m_context->create();
+
+    QTimer *timer = new QTimer(this);
+    timer->setInterval(16);
+    connect(timer, SIGNAL(timeout()), this, SLOT(paint()));
+    timer->start();
+
+    m_context->makeCurrent(this);
+
+    QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
+    const char *vsrc =
+        "attribute highp vec2 vertexCoordsInput;\n"
+        "attribute mediump vec2 texCoordsInput;\n"
+        "varying mediump vec2 texCoords;\n"
+        "void main(void)\n"
+        "{\n"
+        "    texCoords = texCoordsInput;\n"
+        "    gl_Position = vec4(vertexCoordsInput, 0, 1);\n"
+        "}\n";
+    vshader->compileSourceCode(vsrc);
+
+    QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this);
+    const char *fsrc =
+        "uniform sampler2D tex;\n"
+        "varying mediump vec2 texCoords;\n"
+        "void main(void)\n"
+        "{\n"
+        "    gl_FragColor = texture2D(tex, texCoords);\n"
+        "}\n";
+    fshader->compileSourceCode(fsrc);
+
+    m_program = new QOpenGLShaderProgram;
+    m_program->addShader(vshader);
+    m_program->addShader(fshader);
+    m_program->link();
+
+    m_vertexAttribute = m_program->attributeLocation("vertexCoordsInput");
+    m_texCoordsAttribute = m_program->attributeLocation("texCoordsInput");
+}
+
+void PaintedWindow::resizeEvent(QResizeEvent *)
+{
+    m_context->makeCurrent(this);
+
+    delete m_fbo;
+    m_fbo = new QOpenGLFramebufferObject(size());
+}
+
+void PaintedWindow::paint()
+{
+    if (!m_fbo)
+        return;
+
+    m_context->makeCurrent(this);
+
+    QPainterPath path;
+    path.addEllipse(0, 0, m_fbo->width(), m_fbo->height());
+
+    QPainter painter;
+    painter.begin(m_fbo);
+    painter.fillRect(0, 0, m_fbo->width(), m_fbo->height(), Qt::white);
+    painter.setRenderHint(QPainter::Antialiasing);
+    painter.fillPath(path, Qt::blue);
+    painter.end();
+
+    glViewport(0, 0, width(), height());
+
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_STENCIL_TEST);
+    glDisable(GL_BLEND);
+
+    glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    GLfloat texCoords[] = { 0, 0, 1, 0, 0, 1,
+                           1, 0, 1, 1, 0, 1 };
+
+    GLfloat vertexCoords[] = { -1, -1, 1, -1, -1, 1,
+                              1, -1, 1, 1, -1, 1 };
+
+    m_program->bind();
+
+    m_context->functions()->glEnableVertexAttribArray(m_vertexAttribute);
+    m_context->functions()->glEnableVertexAttribArray(m_texCoordsAttribute);
+
+    m_context->functions()->glVertexAttribPointer(m_vertexAttribute, 2, GL_FLOAT, GL_FALSE, 0, vertexCoords);
+    m_context->functions()->glVertexAttribPointer(m_texCoordsAttribute, 2, GL_FLOAT, GL_FALSE, 0, texCoords);
+
+    glBindTexture(GL_TEXTURE_2D, m_fbo->texture());
+
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    m_context->functions()->glDisableVertexAttribArray(m_vertexAttribute);
+    m_context->functions()->glDisableVertexAttribArray(m_texCoordsAttribute);
+
+    m_program->release();
+
+    m_context->swapBuffers(this);
+}
-- 
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