vo/gpu: hwdec_cuda: Refactor gpu api specific code into separate files

The amount of code now present that's specific to Vulkan or OpenGL
has reached the point where we really want to split it out to
avoid a mess of #ifdefs.

At the same time, I'm moving the code to an api neutral location.

1 files changed, 171 insertions, 0 deletions

diff --git a/video/out/hwdec/hwdec_cuda_gl.c b/video/out/hwdec/hwdec_cuda_gl.c
new file mode 100644
index 0000000000..ba3d181a27
--- /dev/null
+++ b/video/out/hwdec/hwdec_cuda_gl.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 2019 Philip Langdale <philipl@overt.org>
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+#include "hwdec_cuda.h"
+#include "options/m_config.h"
+#include "video/out/opengl/formats.h"
+#include "video/out/opengl/ra_gl.h"
+
+#include <libavutil/hwcontext.h>
+#include <libavutil/hwcontext_cuda.h>
+#include <unistd.h>
+
+#define CHECK_CU(x) check_cu((mapper)->owner, (x), #x)
+
+struct ext_gl {
+    CUgraphicsResource cu_res;
+};
+
+static bool cuda_ext_gl_init(struct ra_hwdec_mapper *mapper,
+                             const struct ra_format *format, int n)
+{
+    struct cuda_hw_priv *p_owner = mapper->owner->priv;
+    struct cuda_mapper_priv *p = mapper->priv;
+    CudaFunctions *cu = p_owner->cu;
+    int ret = 0;
+    CUcontext dummy;
+
+    struct ext_gl *egl = talloc_ptrtype(NULL, egl);
+    p->ext[n] = egl;
+
+    struct ra_tex_params params = {
+        .dimensions = 2,
+        .w = mp_image_plane_w(&p->layout, n),
+        .h = mp_image_plane_h(&p->layout, n),
+        .d = 1,
+        .format = format,
+        .render_src = true,
+        .src_linear = format->linear_filter,
+    };
+
+    mapper->tex[n] = ra_tex_create(mapper->ra, &params);
+    if (!mapper->tex[n]) {
+        goto error;
+    }
+
+    GLuint texture;
+    GLenum target;
+    ra_gl_get_raw_tex(mapper->ra, mapper->tex[n], &texture, &target);
+
+    ret = CHECK_CU(cu->cuGraphicsGLRegisterImage(&egl->cu_res, texture, target,
+                                                 CU_GRAPHICS_REGISTER_FLAGS_WRITE_DISCARD));
+    if (ret < 0)
+        goto error;
+
+    ret = CHECK_CU(cu->cuGraphicsMapResources(1, &egl->cu_res, 0));
+    if (ret < 0)
+        goto error;
+
+    ret = CHECK_CU(cu->cuGraphicsSubResourceGetMappedArray(&p->cu_array[n], egl->cu_res,
+                                                           0, 0));
+    if (ret < 0)
+        goto error;
+
+    ret = CHECK_CU(cu->cuGraphicsUnmapResources(1, &egl->cu_res, 0));
+    if (ret < 0)
+        goto error;
+
+    return true;
+
+error:
+    CHECK_CU(cu->cuCtxPopCurrent(&dummy));
+    return false;
+}
+
+static void cuda_ext_gl_uninit(const struct ra_hwdec_mapper *mapper, int n)
+{
+    struct cuda_hw_priv *p_owner = mapper->owner->priv;
+    struct cuda_mapper_priv *p = mapper->priv;
+    CudaFunctions *cu = p_owner->cu;
+
+    struct ext_gl *egl = p->ext[n];
+    if (egl && egl->cu_res) {
+        CHECK_CU(cu->cuGraphicsUnregisterResource(egl->cu_res));
+        egl->cu_res = 0;
+    }
+    talloc_free(egl);
+}
+
+#undef CHECK_CU
+#define CHECK_CU(x) check_cu(hw, (x), #x)
+
+bool cuda_gl_init(const struct ra_hwdec *hw) {
+    int ret = 0;
+    struct cuda_hw_priv *p = hw->priv;
+    CudaFunctions *cu = p->cu;
+
+    if (ra_is_gl(hw->ra)) {
+        GL *gl = ra_gl_get(hw->ra);
+        if (gl->version < 210 && gl->es < 300) {
+            MP_VERBOSE(hw, "need OpenGL >= 2.1 or OpenGL-ES >= 3.0\n");
+            return false;
+        }
+    } else {
+        // This is not an error.
+        return true;
+    }
+
+    CUdevice display_dev;
+    unsigned int device_count;
+    ret = CHECK_CU(cu->cuGLGetDevices(&device_count, &display_dev, 1,
+                                      CU_GL_DEVICE_LIST_ALL));
+    if (ret < 0)
+        return false;
+
+    ret = CHECK_CU(cu->cuCtxCreate(&p->display_ctx, CU_CTX_SCHED_BLOCKING_SYNC,
+                                   display_dev));
+    if (ret < 0)
+        return false;
+
+    p->decode_ctx = p->display_ctx;
+
+    int decode_dev_idx = -1;
+    mp_read_option_raw(hw->global, "cuda-decode-device", &m_option_type_choice,
+                       &decode_dev_idx);
+
+    if (decode_dev_idx > -1) {
+        CUcontext dummy;
+        CUdevice decode_dev;
+        ret = CHECK_CU(cu->cuDeviceGet(&decode_dev, decode_dev_idx));
+        if (ret < 0) {
+            CHECK_CU(cu->cuCtxPopCurrent(&dummy));
+            return false;
+        }
+
+        if (decode_dev != display_dev) {
+            MP_INFO(hw, "Using separate decoder and display devices\n");
+
+            // Pop the display context. We won't use it again during init()
+            ret = CHECK_CU(cu->cuCtxPopCurrent(&dummy));
+            if (ret < 0)
+                return false;
+
+            ret = CHECK_CU(cu->cuCtxCreate(&p->decode_ctx, CU_CTX_SCHED_BLOCKING_SYNC,
+                                           decode_dev));
+            if (ret < 0)
+                return false;
+        }
+    }
+
+    p->ext_init = cuda_ext_gl_init;
+    p->ext_uninit = cuda_ext_gl_uninit;
+
+    return true;
+}