mirror of
https://github.com/gnif/LookingGlass.git
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[client] app: implement new overlay rendering framework
This change set implements a framework for overlays to be registered that make use of ImGui. See `overlay/fps` for a simple implementation example.
This commit is contained in:
Geoffrey McRae
166
client/src/app.c
166
client/src/app.c
@@ -30,6 +30,8 @@
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#include "common/debug.h"
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#include "common/stringutils.h"
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#include "interface/overlay.h"
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#include "overlays.h"
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#include "cimgui.h"
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@@ -612,143 +614,87 @@ void app_showHelp(bool show)
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free(help);
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}
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struct ImGuiGraph
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{
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const char * name;
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RingBuffer buffer;
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bool enabled;
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};
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GraphHandle app_registerGraph(const char * name, RingBuffer buffer)
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{
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struct ImGuiGraph * graph = malloc(sizeof(struct ImGuiGraph));
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graph->name = name;
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graph->buffer = buffer;
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graph->enabled = true;
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ll_push(g_state.graphs, graph);
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return graph;
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return overlayGraph_register(name, buffer);
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}
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void app_unregisterGraph(GraphHandle handle)
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{
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handle->enabled = false;
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overlayGraph_unregister(handle);
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}
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struct BufferMetrics
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struct Overlay
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{
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float min;
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float max;
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float sum;
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float avg;
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float freq;
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const struct LG_OverlayOps * ops;
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void * udata;
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int windowCount;
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};
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static bool rbCalcMetrics(int index, void * value_, void * udata_)
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void app_registerOverlay(const struct LG_OverlayOps * ops, void * params)
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{
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float * value = value_;
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struct BufferMetrics * udata = udata_;
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ASSERT_LG_OVERLAY_VALID(ops);
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if (index == 0)
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void * udata;
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if (!ops->init(&udata, params))
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{
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udata->min = *value;
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udata->max = *value;
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udata->sum = *value;
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return true;
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DEBUG_ERROR("Overlay `%s` failed to initialize", ops->name);
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return;
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}
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if (udata->min > *value)
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udata->min = *value;
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if (udata->max < *value)
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udata->max = *value;
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udata->sum += *value;
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return true;
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struct Overlay * overlay = malloc(sizeof(struct Overlay));
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overlay->ops = ops;
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overlay->udata = udata;
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ll_push(g_state.overlays, overlay);
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}
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bool app_renderImGui(void)
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int app_renderOverlay(struct Rect * rects, int maxRects)
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{
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if (!g_state.showFPS &&
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!g_state.showTiming)
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return false;
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int windowCount = 0;
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struct Overlay * overlay;
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igNewFrame();
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ImGuiStyle * style = igGetStyle();
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style->WindowBorderSize = 0.0f;
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if (g_state.showFPS)
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// get the total window count
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for (ll_reset(g_state.overlays);
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ll_walk(g_state.overlays, (void **)&overlay); )
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{
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const ImVec2 pos = {0.0f, 0.0f};
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igSetNextWindowBgAlpha(0.6f);
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igSetNextWindowPos(pos, 0, pos);
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igBegin(
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"FPS",
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NULL,
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ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_AlwaysAutoResize |
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ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoFocusOnAppearing |
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ImGuiWindowFlags_NoNav | ImGuiWindowFlags_NoTitleBar
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);
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igText("FPS:%4.2f UPS:%4.2f",
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atomic_load_explicit(&g_state.fps, memory_order_relaxed),
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atomic_load_explicit(&g_state.ups, memory_order_relaxed));
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igEnd();
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overlay->windowCount = overlay->ops->getWindowCount(overlay->udata, false);
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windowCount += overlay->windowCount;
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}
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if (g_state.showTiming)
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// return -1 if there are no windows to render
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if (windowCount == 0)
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return -1;
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if (windowCount > maxRects)
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{
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const ImVec2 pos = {0.0f, 0.0f};
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igSetNextWindowBgAlpha(0.4f);
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igSetNextWindowPos(pos, 0, pos);
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rects = NULL;
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windowCount = 0;
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}
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igBegin(
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"Performance Metrics",
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NULL,
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ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_AlwaysAutoResize |
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ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoFocusOnAppearing |
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ImGuiWindowFlags_NoNav | ImGuiWindowFlags_NoTitleBar
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);
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// render the overlays
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igNewFrame();
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for (ll_reset(g_state.overlays);
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ll_walk(g_state.overlays, (void **)&overlay); )
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{
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if (overlay->windowCount == 0)
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continue;
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GraphHandle graph;
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for (ll_reset(g_state.graphs); ll_walk(g_state.graphs, (void **)&graph); )
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{
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if (!graph->enabled)
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continue;
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struct BufferMetrics metrics = {};
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ringbuffer_forEach(graph->buffer, rbCalcMetrics, &metrics);
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if (metrics.sum > 0.0f)
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{
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metrics.avg = metrics.sum / ringbuffer_getCount(graph->buffer);
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metrics.freq = 1000.0f / metrics.avg;
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}
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char title[64];
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const ImVec2 size = {400.0f, 100.0f};
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snprintf(title, sizeof(title),
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"%s: min:%4.2f max:%4.2f avg:%4.2f/%4.2fHz",
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graph->name, metrics.min, metrics.max, metrics.avg, metrics.freq);
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igPlotLinesFloatPtr(
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"",
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(float *)ringbuffer_getValues(graph->buffer),
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ringbuffer_getLength(graph->buffer),
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ringbuffer_getStart (graph->buffer),
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title,
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0.0f,
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50.0f,
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size,
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sizeof(float));
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}
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igEnd();
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overlay->ops->render(overlay->udata, false, rects);
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if (rects)
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rects += overlay->windowCount;
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}
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igRender();
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return true;
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return windowCount;
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}
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void app_freeOverlays(void)
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{
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struct Overlay * overlay;
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while(ll_shift(g_state.overlays, (void **)&overlay))
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{
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overlay->ops->free(overlay->udata);
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free(overlay);
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}
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}
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