mirror of https://github.com/f4exb/sdrangel.git
147 lines
5.0 KiB
C++
147 lines
5.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2016 F4EXB //
|
|
// written by Edouard Griffiths //
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// //
|
|
// This program is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <QOpenGLShaderProgram>
|
|
#include <QOpenGLFunctions>
|
|
#include <QOpenGLContext>
|
|
#include <QImage>
|
|
#include <QMatrix4x4>
|
|
#include <QVector4D>
|
|
#include <QDebug>
|
|
|
|
#include "gui/glshadertextured.h"
|
|
|
|
GLShaderTextured::GLShaderTextured() :
|
|
m_program(0),
|
|
m_texture(0),
|
|
m_matrixLoc(0),
|
|
m_textureLoc(0)
|
|
{ }
|
|
|
|
GLShaderTextured::~GLShaderTextured()
|
|
{
|
|
cleanup();
|
|
}
|
|
|
|
void GLShaderTextured::initializeGL()
|
|
{
|
|
m_program = new QOpenGLShaderProgram;
|
|
|
|
if (!m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, m_vertexShaderSourceTextured)) {
|
|
qDebug() << "GLShaderTextured::initializeGL: error in vertex shader: " << m_program->log();
|
|
}
|
|
|
|
if (!m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, m_fragmentShaderSourceTextured)) {
|
|
qDebug() << "GLShaderTextured::initializeGL: error in fragment shader: " << m_program->log();
|
|
}
|
|
|
|
m_program->bindAttributeLocation("vertex", 0);
|
|
m_program->bindAttributeLocation("texCoord", 1);
|
|
|
|
if (!m_program->link()) {
|
|
qDebug() << "GLShaderTextured::initializeGL: error linking shader: " << m_program->log();
|
|
}
|
|
|
|
m_program->bind();
|
|
m_matrixLoc = m_program->uniformLocation("uMatrix");
|
|
m_textureLoc = m_program->uniformLocation("uTexture");
|
|
m_program->release();
|
|
}
|
|
|
|
void GLShaderTextured::initTexture(const QImage& image, QOpenGLTexture::WrapMode wrapMode)
|
|
{
|
|
if (m_texture) {
|
|
delete m_texture;
|
|
}
|
|
|
|
m_texture = new QOpenGLTexture(image);
|
|
|
|
m_texture->setMinificationFilter(QOpenGLTexture::Linear);
|
|
m_texture->setMagnificationFilter(QOpenGLTexture::Linear);
|
|
m_texture->setWrapMode(wrapMode);
|
|
}
|
|
|
|
void GLShaderTextured::subTexture(int xOffset, int yOffset, int width, int height, const void *pixels)
|
|
{
|
|
if (!m_texture) {
|
|
qDebug("GLShaderTextured::subTexture: no texture defined. Doing nothing");
|
|
return;
|
|
}
|
|
|
|
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
|
|
m_texture->bind();
|
|
f->glTexSubImage2D(GL_TEXTURE_2D, 0, xOffset, yOffset, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
|
|
}
|
|
|
|
void GLShaderTextured::drawSurface(const QMatrix4x4& transformMatrix, GLfloat *textureCoords, GLfloat *vertices, int nbVertices)
|
|
{
|
|
draw(GL_TRIANGLE_FAN, transformMatrix, textureCoords, vertices, nbVertices);
|
|
}
|
|
|
|
void GLShaderTextured::draw(unsigned int mode, const QMatrix4x4& transformMatrix, GLfloat *textureCoords, GLfloat *vertices, int nbVertices)
|
|
{
|
|
if (!m_texture) {
|
|
qDebug("GLShaderTextured::draw: no texture defined. Doing nothing");
|
|
return;
|
|
}
|
|
|
|
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
|
|
m_program->bind();
|
|
m_program->setUniformValue(m_matrixLoc, transformMatrix);
|
|
m_texture->bind();
|
|
m_program->setUniformValue(m_textureLoc, 0); // Use texture unit 0 which magically contains our texture
|
|
f->glEnableVertexAttribArray(0); // vertex
|
|
f->glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, vertices);
|
|
f->glEnableVertexAttribArray(1); // texture coordinates
|
|
f->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, textureCoords);
|
|
f->glDrawArrays(mode, 0, nbVertices);
|
|
f->glDisableVertexAttribArray(0);
|
|
m_program->release();
|
|
}
|
|
|
|
void GLShaderTextured::cleanup()
|
|
{
|
|
if (m_program) {
|
|
delete m_program;
|
|
m_program = 0;
|
|
}
|
|
|
|
if (m_texture) {
|
|
delete m_texture;
|
|
m_texture = 0;
|
|
}
|
|
}
|
|
|
|
const QString GLShaderTextured::m_vertexShaderSourceTextured = QString(
|
|
"uniform highp mat4 uMatrix;\n"
|
|
"attribute highp vec4 vertex;\n"
|
|
"attribute highp vec2 texCoord;\n"
|
|
"varying mediump vec2 texCoordVar;\n"
|
|
"void main() {\n"
|
|
" gl_Position = uMatrix * vertex;\n"
|
|
" texCoordVar = texCoord;\n"
|
|
"}\n"
|
|
);
|
|
|
|
const QString GLShaderTextured::m_fragmentShaderSourceTextured = QString(
|
|
"uniform lowp sampler2D uTexture;\n"
|
|
"varying mediump vec2 texCoordVar;\n"
|
|
"void main() {\n"
|
|
" gl_FragColor = texture2D(uTexture, texCoordVar);\n"
|
|
"}\n"
|
|
);
|