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Merge pull request #2 from Monroe88/master

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Twinaphex 2014-07-27 01:37:25 +02:00
commit 0bbf62e43f
2 changed files with 222 additions and 76 deletions
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143
libretro/libretro.c
View File

@ -13,15 +13,14 @@
#include <xtl.h>
#endif
#define RETRO_DEVICE_MDPAD_3B RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 0)
#define RETRO_DEVICE_MDPAD_6B RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1)
#define RETRO_DEVICE_SMSPAD_2B RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 2)
#define RETRO_DEVICE_PORT_NONE RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 3)
#define RETRO_DEVICE_MDPAD_3B_WAYPLAY RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 4)
#define RETRO_DEVICE_MDPAD_6B_WAYPLAY RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 5)
#define RETRO_DEVICE_MDPAD_3B_TEAMPLAYER RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 6)
#define RETRO_DEVICE_MDPAD_6B_TEAMPLAYER RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 7)
#define RETRO_DEVICE_SMSPAD_4P RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 8)
#define RETRO_DEVICE_MDPAD_3B RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 0)
#define RETRO_DEVICE_MDPAD_6B RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1)
#define RETRO_DEVICE_MSPAD_2B RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 2)
#define RETRO_DEVICE_MDPAD_3B_WAYPLAY RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 3)
#define RETRO_DEVICE_MDPAD_6B_WAYPLAY RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 4)
#define RETRO_DEVICE_MDPAD_3B_TEAMPLAYER RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 5)
#define RETRO_DEVICE_MDPAD_6B_TEAMPLAYER RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 6)
#define RETRO_DEVICE_MSPAD_2B_MASTERTAP RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 7)
#include "shared.h"
#include "libretro.h"
@ -113,8 +112,8 @@ int load_archive(char *filename, unsigned char *buffer, int maxsize, char *exten
{
if (log_cb)
log_cb(RETRO_LOG_ERROR, "Unable to open CD BIOS: %s.\n", filename);
return 0;
}
return 0;
}
if (log_cb)
log_cb(RETRO_LOG_ERROR, "Unable to open file.\n");
@ -171,7 +170,7 @@ void osd_input_update(void)
input_poll_cb();
for(i = 0; i < MAX_INPUTS; i++)
for (i = 0; i < MAX_INPUTS; i++)
{
temp = 0;
switch (input.dev[i])
@ -267,6 +266,14 @@ static void config_default(void)
config.gg_extra = 0;
config.ntsc = 0;
config.render = 0;
/* input options */
input.system[0] = SYSTEM_GAMEPAD;
input.system[1] = SYSTEM_GAMEPAD;
for (i=0; i<MAX_INPUTS; i++)
{
config.input[i].padtype = DEVICE_PAD2B | DEVICE_PAD3B | DEVICE_PAD6B;
}
}
static void bram_load(void)
@ -475,7 +482,7 @@ static bool update_viewport(void)
vheight = vheight * 2;
}
return (oh != vheight);
return ((ow != vwidth) || (oh != vheight));
}
static void check_variables(void)
@ -745,41 +752,41 @@ void retro_set_environment(retro_environment_t cb)
{ NULL, NULL },
};
static const struct retro_controller_description port_1[] = {
{ "Joypad Auto", RETRO_DEVICE_JOYPAD },
{ "Joypad Port Empty", RETRO_DEVICE_NONE },
{ "MD Joypad 3 Button", RETRO_DEVICE_MDPAD_3B },
{ "MD Joypad 6 Button", RETRO_DEVICE_MDPAD_6B },
{ "Joypad Auto", RETRO_DEVICE_JOYPAD },
{ "Joypad Port Empty", RETRO_DEVICE_PORT_NONE },
{ "SMS Joypad 2 Button", RETRO_DEVICE_SMSPAD_2B },
{ "MD Joypad 3 Button + WayPlay", RETRO_DEVICE_MDPAD_3B_WAYPLAY },
{ "MD Joypad 6 Button + WayPlay", RETRO_DEVICE_MDPAD_6B_WAYPLAY },
{ "MS Joypad 2 Button", RETRO_DEVICE_MSPAD_2B },
{ "MD Joypad 3 Button + 4-WayPlay", RETRO_DEVICE_MDPAD_3B_WAYPLAY },
{ "MD Joypad 6 Button + 4-WayPlay", RETRO_DEVICE_MDPAD_6B_WAYPLAY },
{ "MD Joypad 3 Button + Teamplayer", RETRO_DEVICE_MDPAD_3B_TEAMPLAYER },
{ "MD Joypad 6 Button + Teamplayer", RETRO_DEVICE_MDPAD_6B_TEAMPLAYER },
{ "SMS Joypad 4 Player", RETRO_DEVICE_SMSPAD_4P },
{ "MS Joypad 2 Button + Master Tap", RETRO_DEVICE_MSPAD_2B_MASTERTAP },
};
static const struct retro_controller_description port_2[] = {
{ "Joypad Auto", RETRO_DEVICE_JOYPAD },
{ "Joypad Port Empty", RETRO_DEVICE_NONE },
{ "MD Joypad 3 Button", RETRO_DEVICE_MDPAD_3B },
{ "MD Joypad 6 Button", RETRO_DEVICE_MDPAD_6B },
{ "Joypad Auto", RETRO_DEVICE_JOYPAD },
{ "Joypad Port Empty", RETRO_DEVICE_PORT_NONE },
{ "SMS Joypad 2 Button", RETRO_DEVICE_SMSPAD_2B },
{ "MD Joypad 3 Button + WayPlay", RETRO_DEVICE_MDPAD_3B_WAYPLAY },
{ "MD Joypad 6 Button + WayPlay", RETRO_DEVICE_MDPAD_6B_WAYPLAY },
{ "MS Joypad 2 Button", RETRO_DEVICE_MSPAD_2B },
{ "MD Joypad 3 Button + 4-WayPlay", RETRO_DEVICE_MDPAD_3B_WAYPLAY },
{ "MD Joypad 6 Button + 4-WayPlay", RETRO_DEVICE_MDPAD_6B_WAYPLAY },
{ "MD Joypad 3 Button + Teamplayer", RETRO_DEVICE_MDPAD_3B_TEAMPLAYER },
{ "MD Joypad 6 Button + Teamplayer", RETRO_DEVICE_MDPAD_6B_TEAMPLAYER },
{ "MS Joypad 2 Button + Master Tap", RETRO_DEVICE_MSPAD_2B_MASTERTAP },
};
static const struct retro_controller_info ports[] = {
{ port_1, 10 },
{ port_2, 9 },
{ port_2, 10 },
{ 0 },
};
environ_cb = cb;
cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void*)vars);
environ_cb(RETRO_ENVIRONMENT_SET_CONTROLLER_INFO, (void*)ports);
cb(RETRO_ENVIRONMENT_SET_CONTROLLER_INFO, (void*)ports);
}
void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
@ -812,60 +819,83 @@ void retro_set_controller_port_device(unsigned port, unsigned device)
{
switch(device)
{
case RETRO_DEVICE_NONE:
input.system[port] = NO_SYSTEM;
break;
case RETRO_DEVICE_MDPAD_3B:
config.input[port].padtype = DEVICE_PAD3B;
input.dev[port] = DEVICE_PAD3B;
config.input[port*4].padtype = DEVICE_PAD3B;
input.system[port] = SYSTEM_GAMEPAD;
break;
case RETRO_DEVICE_MDPAD_6B:
config.input[port].padtype = DEVICE_PAD6B;
input.dev[port] = DEVICE_PAD6B;
config.input[port*4].padtype = DEVICE_PAD6B;
input.system[port] = SYSTEM_GAMEPAD;
break;
case RETRO_DEVICE_PORT_NONE:
config.input[port].padtype = 0;
input.dev[port] = 0;
input.system[port] = NO_SYSTEM;
break;
case RETRO_DEVICE_SMSPAD_2B:
config.input[port].padtype = DEVICE_PAD2B;
input.dev[port] = DEVICE_PAD2B;
case RETRO_DEVICE_MSPAD_2B:
config.input[port*4].padtype = DEVICE_PAD2B;
input.system[port] = SYSTEM_GAMEPAD;
break;
case RETRO_DEVICE_MDPAD_3B_WAYPLAY:
config.input[port].padtype = DEVICE_PAD3B;
input.dev[port] = DEVICE_PAD3B;
{
int i;
for (i=0; i<4; i++)
{
config.input[port*4 + i].padtype = DEVICE_PAD3B;
}
input.system[0] = input.system[1] = SYSTEM_WAYPLAY;
break;
}
case RETRO_DEVICE_MDPAD_6B_WAYPLAY:
config.input[port].padtype = DEVICE_PAD6B;
input.dev[port] = DEVICE_PAD6B;
{
int i;
for (i=0; i<4; i++)
{
config.input[port*4 + i].padtype = DEVICE_PAD6B;
}
input.system[0] = input.system[1] = SYSTEM_WAYPLAY;
break;
}
case RETRO_DEVICE_MDPAD_3B_TEAMPLAYER:
config.input[port].padtype = DEVICE_PAD3B;
input.dev[port] = DEVICE_PAD3B;
{
int i;
for (i=0; i<4; i++)
{
config.input[port*4 + i].padtype = DEVICE_PAD3B;
}
input.system[port] = SYSTEM_TEAMPLAYER;
break;
}
case RETRO_DEVICE_MDPAD_6B_TEAMPLAYER:
config.input[port].padtype = DEVICE_PAD6B;
input.dev[port] = DEVICE_PAD6B;
{
int i;
for (i=0; i<4; i++)
{
config.input[port*4 + i].padtype = DEVICE_PAD6B;
}
input.system[port] = SYSTEM_TEAMPLAYER;
break;
case RETRO_DEVICE_SMSPAD_4P:
config.input[port].padtype = DEVICE_PAD2B;
input.dev[port] = DEVICE_PAD2B;
input.system[0] = SYSTEM_MASTERTAP;
}
case RETRO_DEVICE_MSPAD_2B_MASTERTAP:
{
int i;
for (i=0; i<4; i++)
{
config.input[port*4 + i].padtype = DEVICE_PAD2B;
}
input.system[port] = SYSTEM_MASTERTAP;
break;
}
case RETRO_DEVICE_JOYPAD:
default:
config.input[port].padtype = DEVICE_PAD2B | DEVICE_PAD6B | DEVICE_PAD3B;
input.dev[port] = DEVICE_PAD2B | DEVICE_PAD6B | DEVICE_PAD3B;
config.input[port*4].padtype = DEVICE_PAD2B | DEVICE_PAD6B | DEVICE_PAD3B;
input.system[port] = SYSTEM_GAMEPAD;
break;
}
input_init();
old_system[0] = input.system[0];
old_system[1] = input.system[1];
io_init();
input_reset();
}
size_t retro_serialize_size(void) { return STATE_SIZE; }
@ -948,9 +978,6 @@ bool retro_load_game(const struct retro_game_info *info)
if (!load_rom((char *)info->path))
return false;
for (i = 0; i < 2; i++)
retro_set_controller_port_device(i, input.dev[i]);
audio_init(44100, vdp_pal ? pal_fps : ntsc_fps);
system_init();
system_reset();
@ -1072,7 +1099,7 @@ void retro_run(void)
{
struct retro_system_av_info info;
retro_get_system_av_info(&info);
environ_cb(RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO, &info);
environ_cb(RETRO_ENVIRONMENT_SET_GEOMETRY, &info.geometry);
}
}

155
libretro/libretro.h
View File

@ -388,16 +388,11 @@ enum retro_mod
// It can be used by the frontend to potentially warn
// about too demanding implementations.
//
// The levels are "floating", but roughly defined as:
// 0: Low-powered embedded devices such as Raspberry Pi
// 1: 6th generation consoles, such as Wii/Xbox 1, and phones, tablets, etc.
// 2: 7th generation consoles, such as PS3/360, with sub-par CPUs.
// 3: Modern desktop/laptops with reasonably powerful CPUs.
// 4: High-end desktops with very powerful CPUs.
// The levels are "floating".
//
// This function can be called on a per-game basis,
// as certain games an implementation can play might be
// particularily demanding.
// particularly demanding.
// If called, it should be called in retro_load_game().
//
#define RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 9
@ -589,15 +584,15 @@ enum retro_mod
// This should *only* be used if the core is completely altering the internal resolutions, aspect ratios, timings, sampling rate, etc.
// Calling this can require a full reinitialization of video/audio drivers in the frontend,
// so it is important to call it very sparingly, and usually only with the users explicit consent.
// An eventual driver reinit will happen so that video and audio callbacks
// An eventual driver reinitialize will happen so that video and audio callbacks
// happening after this call within the same retro_run() call will target the newly initialized driver.
//
// This callback makes it possible to support configurable resolutions in games, which can be useful to
// avoid setting the "worst case" in max_width/max_height.
//
// ***HIGHLY RECOMMENDED*** Do not call this callback every time resolution changes in an emulator core if it's
// expected to be a temporary change, for the reasons of possible driver reinit.
// This call is not a free pass for not trying to provide correct values in retro_get_system_av_info().
// expected to be a temporary change, for the reasons of possible driver reinitialization.
// This call is not a free pass for not trying to provide correct values in retro_get_system_av_info(). If you need to change things like aspect ratio or nominal width/height, use RETRO_ENVIRONMENT_SET_GEOMETRY, which is a softer variant of SET_SYSTEM_AV_INFO.
//
// If this returns false, the frontend does not acknowledge a changed av_info struct.
#define RETRO_ENVIRONMENT_SET_PROC_ADDRESS_CALLBACK 33
@ -640,6 +635,129 @@ enum retro_mod
// The core must pass an array of const struct retro_controller_info which is terminated with
// a blanked out struct. Each element of the struct corresponds to an ascending port index to retro_set_controller_port_device().
// Even if special device types are set in the libretro core, libretro should only poll input based on the base input device types.
#define RETRO_ENVIRONMENT_SET_MEMORY_MAPS (36 | RETRO_ENVIRONMENT_EXPERIMENTAL)
// const struct retro_memory_map * --
// This environment call lets a libretro core tell the frontend about the memory maps this
// core emulates. This can be used to implement, for example, cheats in a core-agnostic way.
//
// Should only be used by emulators; it doesn't make much sense for anything else.
// It is recommended to expose all relevant pointers through retro_get_memory_* as well.
//
// Can be called from retro_init and retro_load_game.
//
#define RETRO_ENVIRONMENT_SET_GEOMETRY 37
// const struct retro_game_geometry * --
// This environment call is similar to SET_SYSTEM_AV_INFO for changing video parameters,
// but provides a guarantee that drivers will not be reinitialized.
// This can only be called from within retro_run().
//
// The purpose of this call is to allow a core to alter nominal width/heights as well as aspect ratios on-the-fly,
// which can be useful for some emulators to change in run-time.
//
// max_width/max_height arguments are ignored and cannot be changed
// with this call as this could potentially require a reinitialization or a non-constant time operation.
// If max_width/max_height are to be changed, SET_SYSTEM_AV_INFO is required.
//
// A frontend must guarantee that this environment call completes in constant time.
#define RETRO_MEMDESC_CONST (1 << 0) // The frontend will never change this memory area once retro_load_game has returned.
#define RETRO_MEMDESC_BIGENDIAN (1 << 1) // The memory area contains big endian data. Default is little endian.
#define RETRO_MEMDESC_ALIGN_2 (1 << 16) // All memory access in this area is aligned to their own size, or 2, whichever is smaller.
#define RETRO_MEMDESC_ALIGN_4 (2 << 16)
#define RETRO_MEMDESC_ALIGN_8 (3 << 16)
#define RETRO_MEMDESC_MINSIZE_2 (1 << 24) // All memory in this region is accessed at least 2 bytes at the time.
#define RETRO_MEMDESC_MINSIZE_4 (2 << 24)
#define RETRO_MEMDESC_MINSIZE_8 (3 << 24)
struct retro_memory_descriptor
{
uint64_t flags;
// Pointer to the start of the relevant ROM or RAM chip.
// It's strongly recommended to use 'offset' if possible, rather than doing math on the pointer.
// If the same byte is mapped my multiple descriptors, their descriptors must have the same pointer.
// If 'start' does not point to the first byte in the pointer, put the difference in 'offset' instead.
// May be NULL if there's nothing usable here (e.g. hardware registers and open bus). No flags should be set if the pointer is NULL.
// It's recommended to minimize the number of descriptors if possible, but not mandatory.
void *ptr;
size_t offset;
// This is the location in the emulated address space where the mapping starts.
size_t start;
// Which bits must be same as in 'start' for this mapping to apply.
// The first memory descriptor to claim a certain byte is the one that applies.
// A bit which is set in 'start' must also be set in this.
// Can be zero, in which case each byte is assumed mapped exactly once. In this case, 'len' must be a power of two.
size_t select;
// If this is nonzero, the set bits are assumed not connected to the memory chip's address pins.
size_t disconnect;
// This one tells the size of the current memory area.
// If, after start+disconnect are applied, the address is higher than this, the highest bit of the address is cleared.
// If the address is still too high, the next highest bit is cleared.
// Can be zero, in which case it's assumed to be infinite (as limited by 'select' and 'disconnect').
size_t len;
// To go from emulated address to physical address, the following order applies:
// Subtract 'start', pick off 'disconnect', apply 'len', add 'offset'.
// The address space name must consist of only a-zA-Z0-9_-, should be as short as feasible (maximum length is 8 plus the NUL),
// and may not be any other address space plus one or more 0-9A-F at the end.
// However, multiple memory descriptors for the same address space is allowed, and the address
// space name can be empty. NULL is treated as empty.
// Address space names are case sensitive, but avoid lowercase if possible.
// The same pointer may exist in multiple address spaces.
// Examples:
// blank+blank - valid (multiple things may be mapped in the same namespace)
// 'Sp'+'Sp' - valid (multiple things may be mapped in the same namespace)
// 'A'+'B' - valid (neither is a prefix of each other)
// 'S'+blank - valid ('S' is not in 0-9A-F)
// 'a'+blank - valid ('a' is not in 0-9A-F)
// 'a'+'A' - valid (neither is a prefix of each other)
// 'AR'+blank - valid ('R' is not in 0-9A-F)
// 'ARB'+blank - valid (the B can't be part of the address either, because there is no namespace 'AR')
// blank+'B' - not valid, because it's ambigous which address space B1234 would refer to.
// The length can't be used for that purpose; the frontend may want to append arbitrary data to an address, without a separator.
const char *addrspace;
};
// The frontend may use the largest value of 'start'+'select' in a certain namespace to infer the size of the address space.
// If the address space is larger than that, a mapping with .ptr=NULL should be at the end of the array, with .select set to all ones for as long as the address space is big.
// Sample descriptors (minus .ptr, and RETRO_MEMFLAG_ on the flags):
// SNES WRAM:
// .start=0x7E0000, .len=0x20000
// (Note that this must be mapped before the ROM in most cases; some of the ROM mappers try to claim $7E0000, or at least $7E8000.)
// SNES SPC700 RAM:
// .addrspace="S", .len=0x10000
// SNES WRAM mirrors:
// .flags=MIRROR, .start=0x000000, .select=0xC0E000, .len=0x2000
// .flags=MIRROR, .start=0x800000, .select=0xC0E000, .len=0x2000
// SNES WRAM mirrors, alternate equivalent descriptor:
// .flags=MIRROR, .select=0x40E000, .disconnect=~0x1FFF
// (Various similar constructions can be created by combining parts of the above two.)
// SNES LoROM (512KB, mirrored a couple of times):
// .flags=CONST, .start=0x008000, .select=0x408000, .disconnect=0x8000, .len=512*1024
// .flags=CONST, .start=0x400000, .select=0x400000, .disconnect=0x8000, .len=512*1024
// SNES HiROM (4MB):
// .flags=CONST, .start=0x400000, .select=0x400000, .len=4*1024*1024
// .flags=CONST, .offset=0x8000, .start=0x008000, .select=0x408000, .len=4*1024*1024
// SNES ExHiROM (8MB):
// .flags=CONST, .offset=0, .start=0xC00000, .select=0xC00000, .len=4*1024*1024
// .flags=CONST, .offset=4*1024*1024, .start=0x400000, .select=0xC00000, .len=4*1024*1024
// .flags=CONST, .offset=0x8000, .start=0x808000, .select=0xC08000, .len=4*1024*1024
// .flags=CONST, .offset=4*1024*1024+0x8000, .start=0x008000, .select=0xC08000, .len=4*1024*1024
// Clarify the size of the address space:
// .ptr=NULL, .select=0xFFFFFF
// .len can be implied by .select in many of them, but was included for clarity.
struct retro_memory_map
{
const struct retro_memory_descriptor *descriptors;
unsigned num_descriptors;
};
struct retro_controller_description
{
@ -987,7 +1105,7 @@ struct retro_frame_time_callback
// it should implement context_destroy callback.
// If called, all GPU resources must be reinitialized.
// Usually called when frontend reinits video driver.
// Also called first time video driver is initialized, allowing libretro core to init resources.
// Also called first time video driver is initialized, allowing libretro core to initialize resources.
typedef void (*retro_hw_context_reset_t)(void);
// Gets current framebuffer which is to be rendered to. Could change every frame potentially.
typedef uintptr_t (*retro_hw_get_current_framebuffer_t)(void);
@ -997,11 +1115,12 @@ typedef retro_proc_address_t (*retro_hw_get_proc_address_t)(const char *sym);
enum retro_hw_context_type
{
RETRO_HW_CONTEXT_NONE = 0,
RETRO_HW_CONTEXT_OPENGL, // OpenGL 2.x. Latest version available before 3.x+. Driver can choose to use latest compatibility context.
RETRO_HW_CONTEXT_OPENGLES2, // GLES 2.0
RETRO_HW_CONTEXT_OPENGL_CORE, // Modern desktop core GL context. Use major/minor fields to set GL version.
RETRO_HW_CONTEXT_OPENGLES3, // GLES 3.0
RETRO_HW_CONTEXT_NONE = 0,
RETRO_HW_CONTEXT_OPENGL = 1, // OpenGL 2.x. Driver can choose to use latest compatibility context.
RETRO_HW_CONTEXT_OPENGLES2 = 2, // GLES 2.0
RETRO_HW_CONTEXT_OPENGL_CORE = 3, // Modern desktop core GL context. Use version_major/version_minor fields to set GL version.
RETRO_HW_CONTEXT_OPENGLES3 = 4, // GLES 3.0
RETRO_HW_CONTEXT_OPENGLES_VERSION = 5, // GLES 3.1+. Set version_major/version_minor. For GLES2 and GLES3, use the corresponding enums directly.
RETRO_HW_CONTEXT_DUMMY = INT_MAX
};
@ -1026,8 +1145,8 @@ struct retro_hw_render_callback
bool stencil; // Set if stencil buffers should be attached.
// If depth and stencil are true, a packed 24/8 buffer will be added. Only attaching stencil is invalid and will be ignored.
bool bottom_left_origin; // Use conventional bottom-left origin convention. Is false, standard libretro top-left origin semantics are used.
unsigned version_major; // Major version number for core GL context.
unsigned version_minor; // Minor version number for core GL context.
unsigned version_major; // Major version number for core GL context or GLES 3.1+.
unsigned version_minor; // Minor version number for core GL context or GLES 3.1+.
bool cache_context; // If this is true, the frontend will go very far to avoid resetting context in scenarios like toggling fullscreen, etc.
// The reset callback might still be called in extreme situations such as if the context is lost beyond recovery.