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#ifndef _EVAS_GL_CORE_PRIVATE_H
#define _EVAS_GL_CORE_PRIVATE_H
#include "evas_gl_private.h"
#include "evas_gl_core.h"
#include "evas_gl_api_ext.h"
#define EVAS_GL_NO_GL_H_CHECK 1
#include "Evas_GL.h"

//#include "evas_gl_ext.h"

extern int _evas_gl_log_dom;

#ifdef ERR
# undef ERR
#endif
#define ERR(...) EINA_LOG_DOM_ERR(_evas_gl_log_dom, __VA_ARGS__)

#ifdef DBG
# undef DBG
#endif
#define DBG(...) EINA_LOG_DOM_DBG(_evas_gl_log_dom, __VA_ARGS__)
#ifdef INF
# undef INF
#endif
#define INF(...) EINA_LOG_DOM_INFO(_evas_gl_log_dom, __VA_ARGS__)

#ifdef WRN
# undef WRN
#endif
#define WRN(...) EINA_LOG_DOM_WARN(_evas_gl_log_dom, __VA_ARGS__)

#ifdef CRI
# undef CRI
#endif
#define CRI(...) EINA_LOG_DOM_CRIT(_evas_gl_log_dom, __VA_ARGS__)


struct _EVGL_Interface
{
   // Returns the native display of evas engine.
   void       *(*display_get)(void *data);

   // Returns the Window surface that evas uses for direct rendering opt
   void       *(*evas_surface_get)(void *data);
   void       *(*native_window_create)(void *data);
   int        (*native_window_destroy)(void *data, void *window);

   // Creates/Destroys the native surface from evas engine.
   void       *(*surface_create)(void *data, void *native_window);
   int         (*surface_destroy)(void *data, void *surface);

   // Creates/Destroys the native surface from evas engine.
   void       *(*context_create)(void *data, void *share_ctx);
   int         (*context_destroy)(void *data, void *context);

   // Calls the make_current from evas_engine.
   int         (*make_current)(void *data, void *surface, void *context, int flush);

   // Returns the get proc_address function
   void       *(*proc_address_get)(const char *name);

   // Returns the string of supported extensions
   const char *(*ext_string_get)(void *data);

   // Returns the current rotation angle of evas
   int         (*rotation_angle_get)(void *data);
};

struct _EVGL_Surface
{
   int w, h;

   //-------------------------//
   // Related to FBO Surface

   // MSAA
   GLint   msaa_samples;

   // Color Buffer Target
   GLuint  color_buf;
   GLint   color_ifmt;
   GLenum  color_fmt;

   // Depth Buffer Target
   GLuint  depth_buf;
   GLenum  depth_fmt;

   // Stencil Buffer Target
   GLuint  stencil_buf;
   GLenum  stencil_fmt;

   // Depth_Stencil Target
   GLuint  depth_stencil_buf;
   GLenum  depth_stencil_fmt;

   // Direct Rendering Option
   int     direct_fb_opt;

   int     cfg_index;

   // Attached Context
   int     fbo_attached;

   // Init Flag
   int     buffers_allocated;

   // Rough estimate of buffer in memory per renderbuffer
   // 0. color 1. depth 2. stencil 3. depth_stencil
   int     buffer_mem[4];

   //-------------------------//

   EVGL_Context *current_ctx;
};



struct _EVGL_Context
{
   EVGLNative_Context context;

   // Context FBO
   GLuint       surface_fbo;

   // Current FBO
   GLuint       current_fbo;

   // Direct Rendering Related
   int          scissor_enabled;
   int          scissor_updated;
   int          scissor_coord[4];
   int          direct_scissor;

   int          viewport_updated;
   int          viewport_coord[4];

   EVGL_Surface *current_sfc;
};

typedef enum _EVGL_Color_Bit
{
   COLOR_NONE      = 0,
   COLOR_RGB_888   = 0x1,
   COLOR_RGBA_8888 = 0x3,
} EVGL_Color_Bit;


typedef enum _EVGL_Depth_Bit
{
   DEPTH_NONE   = 0,
   DEPTH_BIT_8  = 0x1,
   DEPTH_BIT_16 = 0x3,
   DEPTH_BIT_24 = 0x7,
   DEPTH_BIT_32 = 0xF,
   DEPTH_STENCIL = 0xFF,
} EVGL_Depth_Bit;

typedef enum _EVGL_Stencil_Bit
{
   STENCIL_NONE   = 0,
   STENCIL_BIT_1  = 0x1,
   STENCIL_BIT_2  = 0x3,
   STENCIL_BIT_4  = 0x7,
   STENCIL_BIT_8  = 0xF,
   STENCIL_BIT_16 = 0x1F,
} EVGL_Stencil_Bit;


struct _EVGL_Surface_Format
{
   int index;

   EVGL_Color_Bit       color_bit;
   GLint                color_ifmt;
   GLenum               color_fmt;

   EVGL_Depth_Bit       depth_bit;
   GLenum               depth_fmt;

   EVGL_Stencil_Bit     stencil_bit;
   GLenum               stencil_fmt;

   GLenum               depth_stencil_fmt;

   int                  samples;
};

struct _EVGL_Cap
{
   EVGL_Surface_Format  fbo_fmts[100];
   int                  num_fbo_fmts;

   int                  max_w;
   int                  max_h;

   int                  msaa_supported;
   int                  msaa_samples[3];  // High, Med, Low
};

struct _EVGL_Resource
{
   int id;

   EVGLNative_Display   display;
   EVGLNative_Context   context;
   EVGLNative_Window    window;
   EVGLNative_Surface   surface;

   EVGL_Context        *current_ctx;
   void                *current_eng;

   struct {
        EVGLNative_Surface   surface;
        int                  rendered;

        int                  rot;
        int                  win_w;
        int                  win_h;

        struct {
             int             x, y, w, h;
        } img;

        struct {
             int             x, y, w, h;
        } clip;

        Eina_Bool            enabled : 1;

   } direct;
};

struct _EVGL_Engine
{
   int initted;

   EVGL_Interface     *funcs;

   EVGL_Cap            caps;

   const char         *gl_ext;
   const char         *evgl_ext;

   // Resource context/surface per Thread in TLS for evasgl use
   LK(resource_lock);
   Eina_TLS           resource_key;
   Eina_List         *resource_list;
   int                resource_count;
   int                main_tid;

   int                direct_override;
   int                direct_mem_opt;
   int                api_debug_mode;

   // Force Off for Debug purposes
   int                direct_force_off;

   // Force Direct Scissoring off for Debug purposes
   int                direct_scissor_off;

   // Keep track of all the current surfaces/contexts
   Eina_List         *surfaces;
   Eina_List         *contexts;

   //void              *engine_data;  

};


// Evas GL Engine
extern EVGL_Engine   *evgl_engine;

// Internally used functions
extern void           _evgl_api_get(Evas_GL_API *api, int debug);
extern EVGL_Resource *_evgl_tls_resource_get();
extern EVGL_Resource *_evgl_tls_resource_create(void *data);
extern void           _evgl_tls_resource_destroy(void *data);
extern EVGL_Context  *_evgl_current_context_get();
extern int            _evgl_not_in_pixel_get();
extern int            _evgl_direct_enabled();

#endif //_EVAS_GL_CORE_PRIVATE_H