libnx v4.9.0
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framebuffer.h
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1/**
2 * @file framebuffer.h
3 * @brief Framebuffer wrapper object, providing support for software rendered graphics.
4 * @author fincs
5 * @copyright libnx Authors
6 */
7#pragma once
8#include "../nvidia/map.h"
9#include "native_window.h"
10
11/// Converts red/green/blue/alpha components to packed RGBA8 (i.e. \ref PIXEL_FORMAT_RGBA_8888).
12#define RGBA8(r,g,b,a) (((r)&0xff)|(((g)&0xff)<<8)|(((b)&0xff)<<16)|(((a)&0xff)<<24))
13
14/// Same as \ref RGBA8 except with alpha=0xff.
15#define RGBA8_MAXALPHA(r,g,b) RGBA8((r),(g),(b),0xff)
16
17/// Converts red/green/blue to packed RGBX8 (i.e. \ref PIXEL_FORMAT_RGBX_8888).
18#define RGBX8(r,g,b) RGBA8((r),(g),(b),0)
19
20/// Converts red/green/blue components to packed RGB565 (i.e. \ref PIXEL_FORMAT_RGB_565)
21#define RGB565(r,g,b) (((b)&0x1f)|(((g)&0x3f)<<5)|(((r)&0x1f)<<11))
22
23/// Same as \ref RGB565 but accepting 8-bit components as input instead.
24#define RGB565_FROM_RGB8(r,g,b) RGB565((r)>>3,(g)>>2,(b)>>3)
25
26/// Converts red/green/blue/alpha components to packed BGR8 (i.e. \ref PIXEL_FORMAT_BGRA_8888).
27#define BGRA8(r,g,b,a) RGBA8((b),(g),(r),(a))
28
29/// Same as \ref BGRA8 except with alpha=0xff.
30#define BGRA8_MAXALPHA(r,g,b) RGBA8((b),(g),(r),0xff)
31
32/// Converts red/green/blue/alpha components to packed RGBA4 (i.e. \ref PIXEL_FORMAT_RGBA_4444).
33#define RGBA4(r,g,b,a) (((r)&0xf)|(((g)&0xf)<<4)|(((b)&0xf)<<8)|(((a)&0xf)<<12))
34
35/// Same as \ref RGBA4 except with alpha=0xf.
36#define RGBA4_MAXALPHA(r,g,b) RGBA4((r),(g),(b),0xf)
37
38/// Same as \ref RGBA4 but accepting 8-bit components as input instead.
39#define RGBA4_FROM_RGBA8(r,g,b,a) RGBA4((r)>>4,(g)>>4,(b)>>4,(a)>>4)
40
41/// Same as \ref RGBA4_MAXALPHA except with alpha=0xff.
42#define RGBA4_FROM_RGBA8_MAXALPHA(r,g,b) RGBA4_MAXALPHA((r)>>4,(g)>>4,(b)>>4)
43
44/// Framebuffer structure.
45typedef struct Framebuffer {
46 NWindow *win;
47 NvMap map;
48 void* buf;
49 void* buf_linear;
50 u32 stride;
51 u32 width_aligned;
52 u32 height_aligned;
53 u32 num_fbs;
54 u32 fb_size;
55 bool has_init;
57
58/**
59 * @brief Creates a \ref Framebuffer object.
60 * @param[out] fb Output \ref Framebuffer structure.
61 * @param[in] win Pointer to the \ref NWindow to which the \ref Framebuffer will be registered.
62 * @param[in] width Desired width of the framebuffer (usually 1280).
63 * @param[in] height Desired height of the framebuffer (usually 720).
64 * @param[in] format Desired pixel format (see PIXEL_FORMAT_* enum).
65 * @param[in] num_fbs Number of buffers to create. Pass 1 for single-buffering, 2 for double-buffering or 3 for triple-buffering.
66 * @note Framebuffer images are stored in Tegra block linear format with 16Bx2 sector ordering, read TRM chapter 20.1 for more details.
67 * In order to use regular linear layout, consider calling \ref framebufferMakeLinear after the \ref Framebuffer object is created.
68 * @note Presently, only the following pixel formats are supported:
69 * \ref PIXEL_FORMAT_RGBA_8888
70 * \ref PIXEL_FORMAT_RGBX_8888
71 * \ref PIXEL_FORMAT_RGB_565
72 * \ref PIXEL_FORMAT_BGRA_8888
73 * \ref PIXEL_FORMAT_RGBA_4444
74 */
75Result framebufferCreate(Framebuffer* fb, NWindow *win, u32 width, u32 height, u32 format, u32 num_fbs);
76
77/// Enables linear framebuffer mode in a \ref Framebuffer, allocating a shadow buffer in the process.
79
80/// Closes a \ref Framebuffer object, freeing all resources associated with it.
82
83/**
84 * @brief Begins rendering a frame in a \ref Framebuffer.
85 * @param[in] fb Pointer to \ref Framebuffer structure.
86 * @param[out] out_stride Output variable containing the distance in bytes between rows of pixels in memory.
87 * @return Pointer to buffer to which new graphics data should be written to.
88 * @note When this function is called, a buffer will be dequeued from the corresponding \ref NWindow.
89 * @note This function will return pointers to different buffers, depending on the number of buffers it was initialized with.
90 * @note If \ref framebufferMakeLinear was used, this function will instead return a pointer to the shadow linear buffer.
91 * In this case, the offset of a pixel is \p y * \p out_stride + \p x * \p bytes_per_pixel.
92 * @note Each call to \ref framebufferBegin must be paired with a \ref framebufferEnd call.
93 */
94void* framebufferBegin(Framebuffer* fb, u32* out_stride);
95
96/**
97 * @brief Finishes rendering a frame in a \ref Framebuffer.
98 * @param[in] fb Pointer to \ref Framebuffer structure.
99 * @note When this function is called, the written image data will be flushed and queued (presented) in the corresponding \ref NWindow.
100 * @note If \ref framebufferMakeLinear was used, this function will copy the image from the shadow linear buffer to the actual framebuffer,
101 * converting it in the process to the layout expected by the compositor.
102 * @note Each call to \ref framebufferBegin must be paired with a \ref framebufferEnd call.
103 */
Result framebufferCreate(Framebuffer *fb, NWindow *win, u32 width, u32 height, u32 format, u32 num_fbs)
Creates a Framebuffer object.
Result framebufferMakeLinear(Framebuffer *fb)
Enables linear framebuffer mode in a Framebuffer, allocating a shadow buffer in the process.
void * framebufferBegin(Framebuffer *fb, u32 *out_stride)
Begins rendering a frame in a Framebuffer.
void framebufferEnd(Framebuffer *fb)
Finishes rendering a frame in a Framebuffer.
void framebufferClose(Framebuffer *fb)
Closes a Framebuffer object, freeing all resources associated with it.
Native window (NWindow) wrapper object, used for presenting images to the display (or other sinks).
Framebuffer structure.
Definition framebuffer.h:45
Native window structure.
Definition native_window.h:17
Definition map.h:4
u32 Result
Function error code result type.
Definition types.h:44
uint32_t u32
32-bit unsigned integer.
Definition types.h:21