QGLShaderProgram *MGLES2Renderer::compileShaderProgram(const QString &frag, const QString &vert)
{
const QString fragFilename = (frag.isEmpty()) ? defaultFragmentShader() : frag;
QGLShader fragShader(QGLShader::Fragment, d_ptr->m_glContext);
if (!fragShader.compileSourceFile(fragFilename)) {
mWarning("MGLES2Renderer") << "failed to compile fragment shader" << fragFilename
<< '\n' << fragShader.log();
return 0;
}
const QString vertFilename = (vert.isEmpty()) ? defaultVertexShader() : vert;
QGLShader vertShader(QGLShader::Vertex, d_ptr->m_glContext);
if (!vertShader.compileSourceFile(vertFilename)) {
mWarning("MGLES2Renderer") << "failed to compile vertex shader" << vertFilename
<< '\n' << vertShader.log();
return 0;
}
QGLShaderProgram *const program = new QGLShaderProgram(d_ptr->m_glContext);
if (program->addShader(&fragShader) && program->addShader(&vertShader)) {
// bind needed attribute arrays to specific indices -- TODO: What's this for exactly?
program->bindAttributeLocation("vertex", M_ATTR_VERTEX);
program->bindAttributeLocation("texCoord", M_ATTR_TCOORD);
program->bindAttributeLocation("color", M_ATTR_VCOLOR);
// TODO: default context implicit here, but not above?
if (program->link() && program->bind()) {
// Setup default texturing uniforms here so we dont need setup them in runtime
const QByteArray prefix("texture");
GLint maxTexUnits = 0;
glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTexUnits);
for (int i = 0; i < maxTexUnits; ++i) {
const int loc = program->uniformLocation(prefix + QByteArray::number(i));
if (loc >= 0)
program->setUniformValue(loc, GLuint(i));
}
}
return program;
}
mWarning("MGLES2Renderer") << "failed to link shader program"
<< (fragFilename + ':' + vertFilename);
delete program;
return 0;
}
ShaderManager::ShaderManager() {
addShaderSource("osgPango-vert", osg::Shader::VERTEX, defaultVertexShader());
addShaderSource("osgPango-frag1", osg::Shader::FRAGMENT, createBackToFrontShader(1));
addShaderSource("osgPango-frag2", osg::Shader::FRAGMENT, createBackToFrontShader(2));
addShaderSource("osgPango-distanceField", osg::Shader::FRAGMENT, createDistanceFieldShader());
}
