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Diffstat (limited to 'examples/wayland/qwindow-compositor/textureblitter.cpp')
| -rw-r--r-- | examples/wayland/qwindow-compositor/textureblitter.cpp | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/examples/wayland/qwindow-compositor/textureblitter.cpp b/examples/wayland/qwindow-compositor/textureblitter.cpp new file mode 100644 index 000000000..813fd8966 --- /dev/null +++ b/examples/wayland/qwindow-compositor/textureblitter.cpp @@ -0,0 +1,166 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the Qt Compositor. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Digia Plc and its Subsidiary(-ies) 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "textureblitter.h" + +#include <QtGui/QOpenGLShaderProgram> +#include <QtGui/QOpenGLContext> +#include <QtGui/QOpenGLFunctions> + +QT_BEGIN_NAMESPACE + +TextureBlitter::TextureBlitter() + : m_shaderProgram(new QOpenGLShaderProgram) +{ + static const char *textureVertexProgram = + "uniform highp mat4 matrix;\n" + "attribute highp vec3 vertexCoordEntry;\n" + "attribute highp vec2 textureCoordEntry;\n" + "varying highp vec2 textureCoord;\n" + "void main() {\n" + " textureCoord = textureCoordEntry;\n" + " gl_Position = matrix * vec4(vertexCoordEntry, 1);\n" + "}\n"; + + static const char *textureFragmentProgram = + "uniform sampler2D texture;\n" + "varying highp vec2 textureCoord;\n" + "void main() {\n" + " gl_FragColor = texture2D(texture, textureCoord);\n" + "}\n"; + + //Enable transparent windows + glEnable(GL_BLEND); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + + m_shaderProgram->addShaderFromSourceCode(QOpenGLShader::Vertex, textureVertexProgram); + m_shaderProgram->addShaderFromSourceCode(QOpenGLShader::Fragment, textureFragmentProgram); + m_shaderProgram->link(); +} + +TextureBlitter::~TextureBlitter() +{ + delete m_shaderProgram; +} + +void TextureBlitter::bind() +{ + + m_shaderProgram->bind(); + + m_vertexCoordEntry = m_shaderProgram->attributeLocation("vertexCoordEntry"); + m_textureCoordEntry = m_shaderProgram->attributeLocation("textureCoordEntry"); + m_matrixLocation = m_shaderProgram->uniformLocation("matrix"); +} + +void TextureBlitter::release() +{ + m_shaderProgram->release(); +} + +void TextureBlitter::drawTexture(int textureId, const QRectF &targetRect, const QSize &targetSize, int depth, bool targethasInvertedY, bool sourceHasInvertedY) +{ + + glViewport(0,0,targetSize.width(),targetSize.height()); + GLfloat zValue = depth / 1000.0f; + //Set Texture and Vertex coordinates + const GLfloat textureCoordinates[] = { + 0, 0, + 1, 0, + 1, 1, + 0, 1 + }; + + GLfloat x1 = targetRect.left(); + GLfloat x2 = targetRect.right(); + GLfloat y1, y2; + if (targethasInvertedY) { + if (sourceHasInvertedY) { + y1 = targetRect.top(); + y2 = targetRect.bottom(); + } else { + y1 = targetRect.bottom(); + y2 = targetRect.top(); + } + } else { + if (sourceHasInvertedY) { + y1 = targetSize.height() - targetRect.top(); + y2 = targetSize.height() - targetRect.bottom(); + } else { + y1 = targetSize.height() - targetRect.bottom(); + y2 = targetSize.height() - targetRect.top(); + } + } + + const GLfloat vertexCoordinates[] = { + GLfloat(x1), GLfloat(y1), zValue, + GLfloat(x2), GLfloat(y1), zValue, + GLfloat(x2), GLfloat(y2), zValue, + GLfloat(x1), GLfloat(y2), zValue + }; + + //Set matrix to transfrom geometry values into gl coordinate space. + m_transformMatrix.setToIdentity(); + m_transformMatrix.scale( 2.0f / targetSize.width(), 2.0f / targetSize.height() ); + m_transformMatrix.translate(-targetSize.width() / 2.0f, -targetSize.height() / 2.0f); + + //attach the data! + QOpenGLContext *currentContext = QOpenGLContext::currentContext(); + currentContext->functions()->glEnableVertexAttribArray(m_vertexCoordEntry); + currentContext->functions()->glEnableVertexAttribArray(m_textureCoordEntry); + + currentContext->functions()->glVertexAttribPointer(m_vertexCoordEntry, 3, GL_FLOAT, GL_FALSE, 0, vertexCoordinates); + currentContext->functions()->glVertexAttribPointer(m_textureCoordEntry, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinates); + m_shaderProgram->setUniformValue(m_matrixLocation, m_transformMatrix); + + glBindTexture(GL_TEXTURE_2D, textureId); + + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + + glDrawArrays(GL_TRIANGLE_FAN, 0, 4); + + glBindTexture(GL_TEXTURE_2D, 0); + + currentContext->functions()->glDisableVertexAttribArray(m_vertexCoordEntry); + currentContext->functions()->glDisableVertexAttribArray(m_textureCoordEntry); +} + +QT_END_NAMESPACE |