bool GLWidgetRendererPrivate::initTextures(const VideoFormat &fmt)
{
// isSupported(pixfmt)
if (!fmt.isValid())
return false;
video_format.setPixelFormatFFmpeg(fmt.pixelFormatFFmpeg());
//http://www.berkelium.com/OpenGL/GDC99/internalformat.html
//NV12: UV is 1 plane. 16 bits as a unit. GL_LUMINANCE4, 8, 16, ... 32?
//GL_LUMINANCE, GL_LUMINANCE_ALPHA are deprecated in GL3, removed in GL3.1
//replaced by GL_RED, GL_RG, GL_RGB, GL_RGBA? for 1, 2, 3, 4 channel image
//http://www.gamedev.net/topic/634850-do-luminance-textures-still-exist-to-opengl/
//https://github.com/kivy/kivy/issues/1738: GL_LUMINANCE does work on a Galaxy Tab 2. LUMINANCE_ALPHA very slow on Linux
//ALPHA: vec4(1,1,1,A), LUMINANCE: (L,L,L,1), LUMINANCE_ALPHA: (L,L,L,A)
/*
* To support both planar and packed use GL_ALPHA and in shader use r,g,a like xbmc does.
* or use Swizzle_mask to layout the channels: http://www.opengl.org/wiki/Texture#Swizzle_mask
* GL ES2 support: GL_RGB, GL_RGBA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_ALPHA
* http://stackoverflow.com/questions/18688057/which-opengl-es-2-0-texture-formats-are-color-depth-or-stencil-renderable
*/
if (!fmt.isPlanar()) {
GLint internal_fmt;
GLenum data_fmt;
GLenum data_t;
if (!OpenGLHelper::videoFormatToGL(fmt, &internal_fmt, &data_fmt, &data_t)) {
qWarning("no opengl format found");
return false;
}
internal_format = QVector<GLint>(fmt.planeCount(), internal_fmt);
data_format = QVector<GLenum>(fmt.planeCount(), data_fmt);
data_type = QVector<GLenum>(fmt.planeCount(), data_t);
} else {
internal_format.resize(fmt.planeCount());
data_format.resize(fmt.planeCount());
data_type = QVector<GLenum>(fmt.planeCount(), GL_UNSIGNED_BYTE);
if (fmt.isPlanar()) {
/*!
* GLES internal_format == data_format, GL_LUMINANCE_ALPHA is 2 bytes
* so if NV12 use GL_LUMINANCE_ALPHA, YV12 use GL_ALPHA
*/
qDebug("///////////bpp %d", fmt.bytesPerPixel());
internal_format[0] = data_format[0] = GL_LUMINANCE; //or GL_RED for GL
if (fmt.planeCount() == 2) {
internal_format[1] = data_format[1] = GL_LUMINANCE_ALPHA;
} else {
if (fmt.bytesPerPixel(1) == 2) {
// read 16 bits and compute the real luminance in shader
internal_format.fill(GL_LUMINANCE_ALPHA); //vec4(L,L,L,A)
data_format.fill(GL_LUMINANCE_ALPHA);
} else {
internal_format[1] = data_format[1] = GL_LUMINANCE; //vec4(L,L,L,1)
internal_format[2] = data_format[2] = GL_ALPHA;//GL_ALPHA;
}
}
for (int i = 0; i < internal_format.size(); ++i) {
// xbmc use bpp not bpp(plane)
//internal_format[i] = GetGLInternalFormat(data_format[i], fmt.bytesPerPixel(i));
//data_format[i] = internal_format[i];
}
} else {
//glPixelStorei(GL_UNPACK_ALIGNMENT, fmt.bytesPerPixel());
// TODO: if no alpha, data_fmt is not GL_BGRA. align at every upload?
}
}
for (int i = 0; i < fmt.planeCount(); ++i) {
//qDebug("format: %#x GL_LUMINANCE_ALPHA=%#x", data_format[i], GL_LUMINANCE_ALPHA);
if (fmt.bytesPerPixel(i) == 2 && fmt.planeCount() == 3) {
//data_type[i] = GL_UNSIGNED_SHORT;
}
int bpp_gl = OpenGLHelper::bytesOfGLFormat(data_format[i], data_type[i]);
int pad = qCeil((qreal)(texture_size[i].width() - effective_tex_width[i])/(qreal)bpp_gl);
texture_size[i].setWidth(qCeil((qreal)texture_size[i].width()/(qreal)bpp_gl));
texture_upload_size[i].setWidth(qCeil((qreal)texture_upload_size[i].width()/(qreal)bpp_gl));
effective_tex_width[i] /= bpp_gl; //fmt.bytesPerPixel(i);
//effective_tex_width_ratio =
qDebug("texture width: %d - %d = pad: %d. bpp(gl): %d", texture_size[i].width(), effective_tex_width[i], pad, bpp_gl);
}
/*
* there are 2 fragment shaders: rgb and yuv.
* only 1 texture for packed rgb. planar rgb likes yuv
* To support both planar and packed yuv, and mixed yuv(NV12), we give a texture sample
* for each channel. For packed, each (channel) texture sample is the same. For planar,
* packed channels has the same texture sample.
* But the number of actural textures we upload is plane count.
* Which means the number of texture id equals to plane count
*/
if (textures.size() != fmt.planeCount()) {
glDeleteTextures(textures.size(), textures.data());
qDebug("delete %d textures", textures.size());
textures.clear();
textures.resize(fmt.planeCount());
glGenTextures(textures.size(), textures.data());
}
if (!hasGLSL) {
initTexture(textures[0], internal_format[0], data_format[0], data_type[0], texture_size[0].width(), texture_size[0].height());
// more than 1?
qWarning("Does not support GLSL!");
return false;
}
qDebug("init textures...");
for (int i = 0; i < textures.size(); ++i) {
initTexture(textures[i], internal_format[i], data_format[i], data_type[i], texture_size[i].width(), texture_size[i].height());
}
return true;
}
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;
}