/// @overload QGLWidget
void initializeGL(){
printf("OpenGL %d.%d\n",this->format().majorVersion(),this->format().minorVersion());
///--- Create an array object to store properties
{
bool success = vao.create();
Q_ASSERT(success);
vao.bind();
}
///--- Load/compile shaders
{
bool vok = program.addShaderFromSourceCode(QGLShader::Vertex, vshader);
bool fok = program.addShaderFromSourceCode(QGLShader::Fragment, fshader);
bool lok = program.link ();
Q_ASSERT(lok && vok && fok);
bool success = program.bind();
Q_ASSERT(success);
}
///--- Create vertex buffer/attributes "position"
{
static float vertices[] = {
-1.0000,-1.0000,+0.0000,
+1.0000,-1.0000,+0.0000,
-1.0000,+1.0000,+0.0000,
+1.0000,+1.0000,+0.0000,};
vertexbuffer = QGLBuffer(QGLBuffer::VertexBuffer);
bool success = vertexbuffer.create();
Q_ASSERT(success);
vertexbuffer.setUsagePattern( QGLBuffer::StaticDraw );
success = vertexbuffer.bind();
Q_ASSERT(success);
vertexbuffer.allocate( vertices, sizeof(vertices) );
program.setAttributeBuffer("position", GL_FLOAT, 0, 3 );
program.enableAttributeArray("position");
}
///--- Unbind to avoid pollution
vao.release();
program.release();
///--- Background
glClearColor(1.0, 1.0, 1.0, 1.0);
///--- Setup opengl flags
glDisable(GL_DEPTH_TEST);
}
bool GLWidgetRendererPrivate::prepareShaderProgram(const VideoFormat &fmt, ColorTransform::ColorSpace cs)
{
// isSupported(pixfmt)
if (!fmt.isValid())
return false;
releaseShaderProgram();
video_format.setPixelFormatFFmpeg(fmt.pixelFormatFFmpeg());
colorTransform.setInputColorSpace(cs);
// TODO: only to kinds, packed.glsl, planar.glsl
QString frag;
if (fmt.isPlanar()) {
frag = getShaderFromFile("shaders/planar.f.glsl");
} else {
frag = getShaderFromFile("shaders/rgb.f.glsl");
}
if (frag.isEmpty())
return false;
if (fmt.isRGB()) {
frag.prepend("#define INPUT_RGB\n");
} else {
frag.prepend(QString("#define YUV%1P\n").arg(fmt.bitsPerPixel(0)));
}
if (fmt.isPlanar() && fmt.bytesPerPixel(0) == 2) {
if (fmt.isBigEndian())
frag.prepend("#define LA_16BITS_BE\n");
else
frag.prepend("#define LA_16BITS_LE\n");
}
if (cs == ColorTransform::BT601) {
frag.prepend("#define CS_BT601\n");
} else if (cs == ColorTransform::BT709) {
frag.prepend("#define CS_BT709\n");
}
#if NO_QGL_SHADER
program = createProgram(kVertexShader, frag.toUtf8().constData());
if (!program) {
qWarning("Could not create shader program.");
return false;
}
// vertex shader. we can set attribute locations calling glBindAttribLocation
a_Position = glGetAttribLocation(program, "a_Position");
a_TexCoords = glGetAttribLocation(program, "a_TexCoords");
u_matrix = glGetUniformLocation(program, "u_MVP_matrix");
u_bpp = glGetUniformLocation(program, "u_bpp");
u_opacity = glGetUniformLocation(program, "u_opacity");
// fragment shader
u_colorMatrix = glGetUniformLocation(program, "u_colorMatrix");
#else
if (!shader_program->addShaderFromSourceCode(QGLShader::Vertex, kVertexShader)) {
qWarning("Failed to add vertex shader: %s", shader_program->log().toUtf8().constData());
return false;
}
if (!shader_program->addShaderFromSourceCode(QGLShader::Fragment, frag)) {
qWarning("Failed to add fragment shader: %s", shader_program->log().toUtf8().constData());
return false;
}
if (!shader_program->link()) {
qWarning("Failed to link shader program...%s", shader_program->log().toUtf8().constData());
return false;
}
// vertex shader
a_Position = shader_program->attributeLocation("a_Position");
a_TexCoords = shader_program->attributeLocation("a_TexCoords");
u_matrix = shader_program->uniformLocation("u_MVP_matrix");
u_bpp = shader_program->uniformLocation("u_bpp");
u_opacity = shader_program->uniformLocation("u_opacity");
// fragment shader
u_colorMatrix = shader_program->uniformLocation("u_colorMatrix");
#endif //NO_QGL_SHADER
qDebug("glGetAttribLocation(\"a_Position\") = %d\n", a_Position);
qDebug("glGetAttribLocation(\"a_TexCoords\") = %d\n", a_TexCoords);
qDebug("glGetUniformLocation(\"u_MVP_matrix\") = %d\n", u_matrix);
qDebug("glGetUniformLocation(\"u_bpp\") = %d\n", u_bpp);
qDebug("glGetUniformLocation(\"u_opacity\") = %d\n", u_opacity);
qDebug("glGetUniformLocation(\"u_colorMatrix\") = %d\n", u_colorMatrix);
if (fmt.isRGB())
u_Texture.resize(1);
else
u_Texture.resize(fmt.channels());
for (int i = 0; i < u_Texture.size(); ++i) {
QString tex_var = QString("u_Texture%1").arg(i);
#if NO_QGL_SHADER
u_Texture[i] = glGetUniformLocation(program, tex_var.toUtf8().constData());
#else
u_Texture[i] = shader_program->uniformLocation(tex_var);
#endif
qDebug("glGetUniformLocation(\"%s\") = %d\n", tex_var.toUtf8().constData(), u_Texture[i]);
}
return true;
}
/*!
\reimp
*/
void QGLPerVertexColorEffect::setActive(QGLPainter *painter, bool flag)
{
#if defined(QGL_FIXED_FUNCTION_ONLY)
Q_UNUSED(painter);
if (flag) {
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
} else {
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
}
#else
Q_UNUSED(painter);
Q_D(QGLPerVertexColorEffect);
#if !defined(QGL_SHADERS_ONLY)
if (painter->isFixedFunction()) {
d->isFixedFunction = true;
if (flag) {
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
} else {
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
}
return;
}
#endif
static char const pvColorVertexShader[] =
"attribute highp vec4 vertex;\n"
"attribute mediump vec4 color;\n"
"uniform highp mat4 matrix;\n"
"varying mediump vec4 qColor;\n"
"void main(void)\n"
"{\n"
" gl_Position = matrix * vertex;\n"
" qColor = color;\n"
"}\n";
static char const pvColorFragmentShader[] =
"varying mediump vec4 qColor;\n"
"void main(void)\n"
"{\n"
" gl_FragColor = qColor;\n"
"}\n";
QGLShaderProgram *program =
painter->cachedProgram(QLatin1String("qt.color.pervertex"));
d->program = program;
if (!program) {
if (!flag)
return;
program = new QGLShaderProgram();
program->addShaderFromSourceCode(QGLShader::Vertex, pvColorVertexShader);
program->addShaderFromSourceCode(QGLShader::Fragment, pvColorFragmentShader);
program->bindAttributeLocation("vertex", QGL::Position);
program->bindAttributeLocation("color", QGL::Color);
if (!program->link()) {
qWarning("QGLPerVertexColorEffect::setActive(): could not link shader program");
delete program;
program = 0;
return;
}
painter->setCachedProgram(QLatin1String("qt.color.pervertex"), program);
d->program = program;
d->matrixUniform = program->uniformLocation("matrix");
program->bind();
program->enableAttributeArray(QGL::Position);
program->enableAttributeArray(QGL::Color);
} else if (flag) {
d->matrixUniform = program->uniformLocation("matrix");
program->bind();
program->enableAttributeArray(QGL::Position);
program->enableAttributeArray(QGL::Color);
} else {
program->disableAttributeArray(QGL::Position);
program->disableAttributeArray(QGL::Color);
program->release();
}
#endif
}