1 files changed, 155 insertions, 0 deletions
diff --git a/src/capture/xcomposite_cuda.c b/src/capture/xcomposite_cuda.c
new file mode 100644
index 0000000..6e13d2a
--- /dev/null
+++ b/src/capture/xcomposite_cuda.c
@@ -0,0 +1,155 @@
+#include "../../include/capture/xcomposite_cuda.h"
+#include "../../include/cuda.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <libavutil/frame.h>
+#include <libavcodec/avcodec.h>
+
+typedef struct {
+    gsr_capture_xcomposite xcomposite;
+    bool overclock;
+
+    gsr_cuda cuda;
+    CUgraphicsResource cuda_graphics_resources[2];
+    CUarray mapped_arrays[2];
+    CUstream cuda_stream;
+} gsr_capture_xcomposite_cuda;
+
+static void gsr_capture_xcomposite_cuda_stop(gsr_capture *cap, AVCodecContext *video_codec_context);
+
+static int gsr_capture_xcomposite_cuda_start(gsr_capture *cap, AVCodecContext *video_codec_context, AVFrame *frame) {
+    gsr_capture_xcomposite_cuda *cap_xcomp = cap->priv;
+
+    const int res = gsr_capture_xcomposite_start(&cap_xcomp->xcomposite, video_codec_context, frame);
+    if(res != 0) {
+        gsr_capture_xcomposite_cuda_stop(cap, video_codec_context);
+        return res;
+    }
+
+    if(!gsr_cuda_load(&cap_xcomp->cuda, cap_xcomp->xcomposite.params.egl->x11.dpy, cap_xcomp->overclock)) {
+        fprintf(stderr, "gsr error: gsr_capture_kms_cuda_start: failed to load cuda\n");
+        gsr_capture_xcomposite_cuda_stop(cap, video_codec_context);
+        return -1;
+    }
+
+    if(!cuda_create_codec_context(cap_xcomp->cuda.cu_ctx, video_codec_context, video_codec_context->width, video_codec_context->height, false, &cap_xcomp->cuda_stream)) {
+        gsr_capture_xcomposite_cuda_stop(cap, video_codec_context);
+        return -1;
+    }
+
+    gsr_cuda_context cuda_context = {
+        .cuda = &cap_xcomp->cuda,
+        .cuda_graphics_resources = cap_xcomp->cuda_graphics_resources,
+        .mapped_arrays = cap_xcomp->mapped_arrays
+    };
+
+    if(!gsr_capture_base_setup_cuda_textures(&cap_xcomp->xcomposite.base, frame, &cuda_context, cap_xcomp->xcomposite.params.color_range, GSR_SOURCE_COLOR_RGB, false)) {
+        gsr_capture_xcomposite_cuda_stop(cap, video_codec_context);
+        return -1;
+    }
+
+    return 0;
+}
+
+static void gsr_capture_xcomposite_unload_cuda_graphics(gsr_capture_xcomposite_cuda *cap_xcomp) {
+    if(cap_xcomp->cuda.cu_ctx) {
+        for(int i = 0; i < 2; ++i) {
+            if(cap_xcomp->cuda_graphics_resources[i]) {
+                cap_xcomp->cuda.cuGraphicsUnmapResources(1, &cap_xcomp->cuda_graphics_resources[i], 0);
+                cap_xcomp->cuda.cuGraphicsUnregisterResource(cap_xcomp->cuda_graphics_resources[i]);
+                cap_xcomp->cuda_graphics_resources[i] = 0;
+            }
+        }
+    }
+}
+
+static void gsr_capture_xcomposite_cuda_stop(gsr_capture *cap, AVCodecContext *video_codec_context) {
+    (void)video_codec_context;
+    gsr_capture_xcomposite_cuda *cap_xcomp = cap->priv;
+    gsr_capture_xcomposite_stop(&cap_xcomp->xcomposite);
+    gsr_capture_xcomposite_unload_cuda_graphics(cap_xcomp);
+    gsr_cuda_unload(&cap_xcomp->cuda);
+}
+
+static void gsr_capture_xcomposite_cuda_tick(gsr_capture *cap, AVCodecContext *video_codec_context) {
+    gsr_capture_xcomposite_cuda *cap_xcomp = cap->priv;
+    gsr_capture_xcomposite_tick(&cap_xcomp->xcomposite, video_codec_context);
+}
+
+static bool gsr_capture_xcomposite_cuda_should_stop(gsr_capture *cap, bool *err) {
+    gsr_capture_xcomposite_cuda *cap_xcomp = cap->priv;
+    return gsr_capture_xcomposite_should_stop(&cap_xcomp->xcomposite, err);
+}
+
+static int gsr_capture_xcomposite_cuda_capture(gsr_capture *cap, AVFrame *frame) {
+    gsr_capture_xcomposite_cuda *cap_xcomp = cap->priv;
+
+    gsr_capture_xcomposite_capture(&cap_xcomp->xcomposite, frame);
+
+    const int div[2] = {1, 2}; // divide UV texture size by 2 because chroma is half size
+    for(int i = 0; i < 2; ++i) {
+        CUDA_MEMCPY2D memcpy_struct;
+        memcpy_struct.srcXInBytes = 0;
+        memcpy_struct.srcY = 0;
+        memcpy_struct.srcMemoryType = CU_MEMORYTYPE_ARRAY;
+
+        memcpy_struct.dstXInBytes = 0;
+        memcpy_struct.dstY = 0;
+        memcpy_struct.dstMemoryType = CU_MEMORYTYPE_DEVICE;
+
+        memcpy_struct.srcArray = cap_xcomp->mapped_arrays[i];
+        memcpy_struct.srcPitch = frame->width / div[i];
+        memcpy_struct.dstDevice = (CUdeviceptr)frame->data[i];
+        memcpy_struct.dstPitch = frame->linesize[i];
+        memcpy_struct.WidthInBytes = frame->width;
+        memcpy_struct.Height = frame->height / div[i];
+        // TODO: Remove this copy if possible
+        cap_xcomp->cuda.cuMemcpy2DAsync_v2(&memcpy_struct, cap_xcomp->cuda_stream);
+    }
+
+    // TODO: needed?
+    cap_xcomp->cuda.cuStreamSynchronize(cap_xcomp->cuda_stream);
+
+    return 0;
+}
+
+static void gsr_capture_xcomposite_cuda_destroy(gsr_capture *cap, AVCodecContext *video_codec_context) {
+    if(cap->priv) {
+        gsr_capture_xcomposite_cuda_stop(cap, video_codec_context);
+        free(cap->priv);
+        cap->priv = NULL;
+    }
+    free(cap);
+}
+
+gsr_capture* gsr_capture_xcomposite_cuda_create(const gsr_capture_xcomposite_cuda_params *params) {
+    if(!params) {
+        fprintf(stderr, "gsr error: gsr_capture_xcomposite_cuda_create params is NULL\n");
+        return NULL;
+    }
+
+    gsr_capture *cap = calloc(1, sizeof(gsr_capture));
+    if(!cap)
+        return NULL;
+
+    gsr_capture_xcomposite_cuda *cap_xcomp = calloc(1, sizeof(gsr_capture_xcomposite_cuda));
+    if(!cap_xcomp) {
+        free(cap);
+        return NULL;
+    }
+
+    gsr_capture_xcomposite_init(&cap_xcomp->xcomposite, &params->base);
+    cap_xcomp->overclock = params->overclock;
+    
+    *cap = (gsr_capture) {
+        .start = gsr_capture_xcomposite_cuda_start,
+        .tick = gsr_capture_xcomposite_cuda_tick,
+        .should_stop = gsr_capture_xcomposite_cuda_should_stop,
+        .capture = gsr_capture_xcomposite_cuda_capture,
+        .capture_end = NULL,
+        .destroy = gsr_capture_xcomposite_cuda_destroy,
+        .priv = cap_xcomp
+    };
+
+    return cap;
+}