Add some maybe-helpful comments.

[nageru] / theme.cpp

diff --git a/theme.cpp b/theme.cpp
index cfb9527f0dc97b6ad58324197fbac7e8afb70290..caedbf4b1899a0bee3d26497142376c81d884440 100644 (file)
--- a/theme.cpp
+++ b/theme.cpp
@@ -210,6 +210,22 @@ int LiveInputWrapper_connect_signal(lua_State* L)
        return 0;
 }
 
+int LiveInputWrapper_get_width(lua_State* L)
+{
+       assert(lua_gettop(L) == 1);
+       LiveInputWrapper *input = (LiveInputWrapper *)luaL_checkudata(L, 1, "LiveInputWrapper");
+       lua_pushnumber(L, input->get_width());
+       return 1;
+}
+
+int LiveInputWrapper_get_height(lua_State* L)
+{
+       assert(lua_gettop(L) == 1);
+       LiveInputWrapper *input = (LiveInputWrapper *)luaL_checkudata(L, 1, "LiveInputWrapper");
+       lua_pushnumber(L, input->get_height());
+       return 1;
+}
+
 int ImageInput_new(lua_State* L)
 {
        assert(lua_gettop(L) == 1);
@@ -326,6 +342,9 @@ const luaL_Reg EffectChain_funcs[] = {
 
 const luaL_Reg LiveInputWrapper_funcs[] = {
        { "connect_signal", LiveInputWrapper_connect_signal },
+       // These are only valid during calls to get_chain and the setup chain callback.
+       { "get_width", LiveInputWrapper_get_width },
+       { "get_height", LiveInputWrapper_get_height },
        { NULL, NULL }
 };
 
@@ -443,24 +462,39 @@ LiveInputWrapper::LiveInputWrapper(Theme *theme, EffectChain *chain, bool overri
 void LiveInputWrapper::connect_signal(int signal_num)
 {
        if (global_mixer == nullptr) {
+               // No data yet.
                return;
        }
 
        signal_num = theme->map_signal(signal_num);
 
-       Mixer::BufferedFrame frame = global_mixer->get_buffered_frame(signal_num, 0);
+       BufferedFrame frame = theme->input_state->buffered_frames[signal_num][0];
        const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
 
        input->set_texture_num(0, userdata->tex_y[frame.field_number]);
        input->set_texture_num(1, userdata->tex_cbcr[frame.field_number]);
        input->set_width(userdata->last_width[frame.field_number]);
        input->set_height(userdata->last_height[frame.field_number]);
+}
+
+unsigned LiveInputWrapper::get_width() const
+{
+       if (last_connected_signal_num == -1) {
+               return 0;
+       }
+       BufferedFrame frame = theme->input_state->buffered_frames[last_connected_signal_num][0];
+       const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
+       return userdata->last_width[frame.field_number];
+}
 
-       // Hold on to the refcount so that we don't release the input frame
-       // until we're done rendering from it.
-       if (theme->used_input_frames_collector != nullptr) {
-               theme->used_input_frames_collector->push_back(frame.frame);
+unsigned LiveInputWrapper::get_height() const
+{
+       if (last_connected_signal_num == -1) {
+               return 0;
        }
+       BufferedFrame frame = theme->input_state->buffered_frames[last_connected_signal_num][0];
+       const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
+       return userdata->last_height[frame.field_number];
 }
 
 Theme::Theme(const char *filename, ResourcePool *resource_pool, unsigned num_cards)
@@ -505,16 +539,16 @@ Theme::Theme(const char *filename, ResourcePool *resource_pool, unsigned num_car
 void Theme::register_class(const char *class_name, const luaL_Reg *funcs)
 {
        assert(lua_gettop(L) == 0);
-       luaL_newmetatable(L, class_name);
+       luaL_newmetatable(L, class_name);  // mt = {}
        lua_pushlightuserdata(L, this);
-       luaL_setfuncs(L, funcs, 1);
+       luaL_setfuncs(L, funcs, 1);        // for (name,f in funcs) { mt[name] = f, with upvalue {theme} }
        lua_pushvalue(L, -1);
-       lua_setfield(L, -2, "__index");
-       lua_setglobal(L, class_name);
+       lua_setfield(L, -2, "__index");    // mt.__index = mt
+       lua_setglobal(L, class_name);      // ClassName = mt
        assert(lua_gettop(L) == 0);
 }
 
-Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned height)
+Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned height, InputState input_state) 
 {
        Chain chain;
 
@@ -526,12 +560,11 @@ Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned he
        lua_pushnumber(L, width);
        lua_pushnumber(L, height);
 
-       this->used_input_frames_collector = &chain.input_frames;
+       this->input_state = &input_state;
        if (lua_pcall(L, 4, 2, 0) != 0) {
                fprintf(stderr, "error running function `get_chain': %s\n", lua_tostring(L, -1));
                exit(1);
        }
-       this->used_input_frames_collector = nullptr;
 
        chain.chain = (EffectChain *)luaL_checkudata(L, -2, "EffectChain");
        if (!lua_isfunction(L, -1)) {
@@ -543,9 +576,11 @@ Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned he
        lua_pop(L, 2);
        assert(lua_gettop(L) == 0);
 
-       chain.setup_chain = [this, funcref]{
+       chain.setup_chain = [this, funcref, input_state]{
                unique_lock<mutex> lock(m);
 
+               this->input_state = &input_state;
+
                // Set up state, including connecting signals.
                lua_rawgeti(L, LUA_REGISTRYINDEX, funcref->get());
                if (lua_pcall(L, 0, 0, 0) != 0) {
@@ -555,6 +590,14 @@ Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned he
                assert(lua_gettop(L) == 0);
        };
 
+       // TODO: Can we do better, e.g. by running setup_chain() and seeing what it references?
+       // Actually, setup_chain does maybe hold all the references we need now anyway?
+       for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
+               for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
+                       chain.input_frames.push_back(input_state.buffered_frames[card_index][frame_num].frame);
+               }
+       }
+
        return chain;
 }