git.sesse.net Git - nageru/blob - pbo_frame_allocator.h

   1 #ifndef _PBO_FRAME_ALLOCATOR
   2 #define _PBO_FRAME_ALLOCATOR 1
   3
   4 #include <epoxy/gl.h>
   5 #include <stdbool.h>
   6 #include <stddef.h>
   7 #include <memory>
   8 #include <mutex>
   9 #include <queue>
  10
  11 #include "bmusb/bmusb.h"
  12
  13 // An allocator that allocates straight into OpenGL pinned memory.
  14 // Meant for video frames only. We use a queue rather than a stack,
  15 // since we want to maximize pipelineability.
  16 class PBOFrameAllocator : public bmusb::FrameAllocator {
  17 public:
  18         // Note: You need to have an OpenGL context when calling
  19         // the constructor.
  20         PBOFrameAllocator(bmusb::PixelFormat pixel_format,
  21                           size_t frame_size,
  22                           GLuint width, GLuint height,
  23                           size_t num_queued_frames = 16,
  24                           GLenum buffer = GL_PIXEL_UNPACK_BUFFER_ARB,
  25                           GLenum permissions = GL_MAP_WRITE_BIT,
  26                           GLenum map_bits = GL_MAP_FLUSH_EXPLICIT_BIT);
  27         ~PBOFrameAllocator() override;
  28         Frame alloc_frame() override;
  29         void release_frame(Frame frame) override;
  30
  31         struct Userdata {
  32                 GLuint pbo;
  33
  34                 // NOTE: These frames typically go into LiveInputWrapper, which is
  35                 // configured to accept one type of frame only. In other words,
  36                 // the existence of a format field doesn't mean you can set it
  37                 // freely at runtime.
  38                 bmusb::PixelFormat pixel_format;
  39
  40                 // The second set is only used for the second field of interlaced inputs.
  41                 GLuint tex_y[2], tex_cbcr[2];  // For PixelFormat_8BitYCbCr.
  42                 GLuint tex_v210[2], tex_444[2];  // For PixelFormat_10BitYCbCr.
  43                 GLuint tex_rgba[2];  // For PixelFormat_8BitBGRA.
  44                 GLuint last_width[2], last_height[2];
  45                 GLuint last_v210_width[2];  // PixelFormat_10BitYCbCr.
  46                 bool last_interlaced, last_has_signal, last_is_connected;
  47                 unsigned last_frame_rate_nom, last_frame_rate_den;
  48         };
  49
  50 private:
  51         bmusb::PixelFormat pixel_format;
  52         std::mutex freelist_mutex;
  53         std::queue<Frame> freelist;
  54         GLenum buffer;
  55         std::unique_ptr<Userdata[]> userdata;
  56 };
  57
  58 #endif  // !defined(_PBO_FRAME_ALLOCATOR)