mirror of
https://github.com/Relintai/sdl2_frt.git
synced 2024-12-20 22:16:49 +01:00
311 lines
11 KiB
C
311 lines
11 KiB
C
/*
|
|
* keyboard.c
|
|
* written by Holmes Futrell
|
|
* use however you want
|
|
*/
|
|
|
|
#include "SDL.h"
|
|
#include "common.h"
|
|
|
|
#define GLYPH_SIZE_IMAGE 16 /* size of glyphs (characters) in the bitmap font file */
|
|
#define GLYPH_SIZE_SCREEN 32 /* size of glyphs (characters) as shown on the screen */
|
|
|
|
static SDL_Texture *texture; /* texture where we'll hold our font */
|
|
|
|
/* function declarations */
|
|
void cleanup(void);
|
|
void drawBlank(int x, int y);
|
|
|
|
static SDL_Renderer *renderer;
|
|
static int numChars = 0; /* number of characters we've typed so far */
|
|
static SDL_bool lastCharWasColon = 0; /* we use this to detect sequences such as :) */
|
|
static SDL_Color bg_color = { 50, 50, 100, 255 }; /* color of background */
|
|
|
|
/* this structure maps a scancode to an index in our bitmap font.
|
|
it also contains data about under which modifiers the mapping is valid
|
|
(for example, we don't want shift + 1 to produce the character '1',
|
|
but rather the character '!')
|
|
*/
|
|
typedef struct
|
|
{
|
|
SDL_Scancode scancode; /* scancode of the key we want to map */
|
|
int allow_no_mod; /* is the map valid if the key has no modifiers? */
|
|
SDL_Keymod mod; /* what modifiers are allowed for the mapping */
|
|
int index; /* what index in the font does the scancode map to */
|
|
} fontMapping;
|
|
|
|
#define TABLE_SIZE 51 /* size of our table which maps keys and modifiers to font indices */
|
|
|
|
/* Below is the table that defines the mapping between scancodes and modifiers to indices in the
|
|
bitmap font. As an example, then line '{ SDL_SCANCODE_A, 1, KMOD_SHIFT, 33 }' means, map
|
|
the key A (which has scancode SDL_SCANCODE_A) to index 33 in the font (which is a picture of an A),
|
|
The '1' means that the mapping is valid even if there are no modifiers, and KMOD_SHIFT means the
|
|
mapping is also valid if the user is holding shift.
|
|
*/
|
|
fontMapping map[TABLE_SIZE] = {
|
|
|
|
{SDL_SCANCODE_A, 1, KMOD_SHIFT, 33}, /* A */
|
|
{SDL_SCANCODE_B, 1, KMOD_SHIFT, 34}, /* B */
|
|
{SDL_SCANCODE_C, 1, KMOD_SHIFT, 35}, /* C */
|
|
{SDL_SCANCODE_D, 1, KMOD_SHIFT, 36}, /* D */
|
|
{SDL_SCANCODE_E, 1, KMOD_SHIFT, 37}, /* E */
|
|
{SDL_SCANCODE_F, 1, KMOD_SHIFT, 38}, /* F */
|
|
{SDL_SCANCODE_G, 1, KMOD_SHIFT, 39}, /* G */
|
|
{SDL_SCANCODE_H, 1, KMOD_SHIFT, 40}, /* H */
|
|
{SDL_SCANCODE_I, 1, KMOD_SHIFT, 41}, /* I */
|
|
{SDL_SCANCODE_J, 1, KMOD_SHIFT, 42}, /* J */
|
|
{SDL_SCANCODE_K, 1, KMOD_SHIFT, 43}, /* K */
|
|
{SDL_SCANCODE_L, 1, KMOD_SHIFT, 44}, /* L */
|
|
{SDL_SCANCODE_M, 1, KMOD_SHIFT, 45}, /* M */
|
|
{SDL_SCANCODE_N, 1, KMOD_SHIFT, 46}, /* N */
|
|
{SDL_SCANCODE_O, 1, KMOD_SHIFT, 47}, /* O */
|
|
{SDL_SCANCODE_P, 1, KMOD_SHIFT, 48}, /* P */
|
|
{SDL_SCANCODE_Q, 1, KMOD_SHIFT, 49}, /* Q */
|
|
{SDL_SCANCODE_R, 1, KMOD_SHIFT, 50}, /* R */
|
|
{SDL_SCANCODE_S, 1, KMOD_SHIFT, 51}, /* S */
|
|
{SDL_SCANCODE_T, 1, KMOD_SHIFT, 52}, /* T */
|
|
{SDL_SCANCODE_U, 1, KMOD_SHIFT, 53}, /* U */
|
|
{SDL_SCANCODE_V, 1, KMOD_SHIFT, 54}, /* V */
|
|
{SDL_SCANCODE_W, 1, KMOD_SHIFT, 55}, /* W */
|
|
{SDL_SCANCODE_X, 1, KMOD_SHIFT, 56}, /* X */
|
|
{SDL_SCANCODE_Y, 1, KMOD_SHIFT, 57}, /* Y */
|
|
{SDL_SCANCODE_Z, 1, KMOD_SHIFT, 58}, /* Z */
|
|
{SDL_SCANCODE_0, 1, 0, 16}, /* 0 */
|
|
{SDL_SCANCODE_1, 1, 0, 17}, /* 1 */
|
|
{SDL_SCANCODE_2, 1, 0, 18}, /* 2 */
|
|
{SDL_SCANCODE_3, 1, 0, 19}, /* 3 */
|
|
{SDL_SCANCODE_4, 1, 0, 20}, /* 4 */
|
|
{SDL_SCANCODE_5, 1, 0, 21}, /* 5 */
|
|
{SDL_SCANCODE_6, 1, 0, 22}, /* 6 */
|
|
{SDL_SCANCODE_7, 1, 0, 23}, /* 7 */
|
|
{SDL_SCANCODE_8, 1, 0, 24}, /* 8 */
|
|
{SDL_SCANCODE_9, 1, 0, 25}, /* 9 */
|
|
{SDL_SCANCODE_SPACE, 1, 0, 0}, /* ' ' */
|
|
{SDL_SCANCODE_1, 0, KMOD_SHIFT, 1}, /* ! */
|
|
{SDL_SCANCODE_SLASH, 0, KMOD_SHIFT, 31}, /* ? */
|
|
{SDL_SCANCODE_SLASH, 1, 0, 15}, /* / */
|
|
{SDL_SCANCODE_COMMA, 1, 0, 12}, /* , */
|
|
{SDL_SCANCODE_SEMICOLON, 1, 0, 27}, /* ; */
|
|
{SDL_SCANCODE_SEMICOLON, 0, KMOD_SHIFT, 26}, /* : */
|
|
{SDL_SCANCODE_PERIOD, 1, 0, 14}, /* . */
|
|
{SDL_SCANCODE_MINUS, 1, 0, 13}, /* - */
|
|
{SDL_SCANCODE_EQUALS, 0, KMOD_SHIFT, 11}, /* = */
|
|
{SDL_SCANCODE_APOSTROPHE, 1, 0, 7}, /* ' */
|
|
{SDL_SCANCODE_APOSTROPHE, 0, KMOD_SHIFT, 2}, /* " */
|
|
{SDL_SCANCODE_5, 0, KMOD_SHIFT, 5}, /* % */
|
|
|
|
};
|
|
|
|
/*
|
|
This function maps an SDL_KeySym to an index in the bitmap font.
|
|
It does so by scanning through the font mapping table one entry
|
|
at a time.
|
|
|
|
If a match is found (scancode and allowed modifiers), the proper
|
|
index is returned.
|
|
|
|
If there is no entry for the key, -1 is returned
|
|
*/
|
|
int
|
|
keyToIndex(SDL_Keysym key)
|
|
{
|
|
int i, index = -1;
|
|
for (i = 0; i < TABLE_SIZE; i++) {
|
|
fontMapping compare = map[i];
|
|
if (key.scancode == compare.scancode) {
|
|
/* if this entry is valid with no key mod and we have no keymod, or if
|
|
the key's modifiers are allowed modifiers for that mapping */
|
|
if ((compare.allow_no_mod && key.mod == 0)
|
|
|| (key.mod & compare.mod)) {
|
|
index = compare.index;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return index;
|
|
}
|
|
|
|
/*
|
|
This function returns and x,y position for a given character number.
|
|
It is used for positioning each character of text
|
|
*/
|
|
void
|
|
getPositionForCharNumber(int n, int *x, int *y)
|
|
{
|
|
int x_padding = 16; /* padding space on left and right side of screen */
|
|
int y_padding = 32; /* padding space at top of screen */
|
|
/* figure out the number of characters that can fit horizontally across the screen */
|
|
int max_x_chars = (SCREEN_WIDTH - 2 * x_padding) / GLYPH_SIZE_SCREEN;
|
|
int line_separation = 5; /* pixels between each line */
|
|
*x = (n % max_x_chars) * GLYPH_SIZE_SCREEN + x_padding;
|
|
*y = (n / max_x_chars) * (GLYPH_SIZE_SCREEN + line_separation) +
|
|
y_padding;
|
|
}
|
|
|
|
void
|
|
drawIndex(int index)
|
|
{
|
|
int x, y;
|
|
getPositionForCharNumber(numChars, &x, &y);
|
|
SDL_Rect srcRect =
|
|
{ GLYPH_SIZE_IMAGE * index, 0, GLYPH_SIZE_IMAGE, GLYPH_SIZE_IMAGE };
|
|
SDL_Rect dstRect = { x, y, GLYPH_SIZE_SCREEN, GLYPH_SIZE_SCREEN };
|
|
drawBlank(x, y);
|
|
SDL_RenderCopy(renderer, texture, &srcRect, &dstRect);
|
|
}
|
|
|
|
/* draws the cursor icon at the current end position of the text */
|
|
void
|
|
drawCursor(void)
|
|
{
|
|
drawIndex(29); /* cursor is at index 29 in the bitmap font */
|
|
}
|
|
|
|
/* paints over a glyph sized region with the background color
|
|
in effect it erases the area
|
|
*/
|
|
void
|
|
drawBlank(int x, int y)
|
|
{
|
|
SDL_Rect rect = { x, y, GLYPH_SIZE_SCREEN, GLYPH_SIZE_SCREEN };
|
|
SDL_SetRenderDrawColor(renderer, bg_color.r, bg_color.g, bg_color.b, bg_color.a);
|
|
SDL_RenderFillRect(renderer, &rect);
|
|
}
|
|
|
|
/* moves backwards one character, erasing the last one put down */
|
|
void
|
|
backspace(void)
|
|
{
|
|
int x, y;
|
|
if (numChars > 0) {
|
|
getPositionForCharNumber(numChars, &x, &y);
|
|
drawBlank(x, y);
|
|
numChars--;
|
|
getPositionForCharNumber(numChars, &x, &y);
|
|
drawBlank(x, y);
|
|
drawCursor();
|
|
}
|
|
}
|
|
|
|
/* this function loads our font into an SDL_Texture and returns the SDL_Texture */
|
|
SDL_Texture*
|
|
loadFont(void)
|
|
{
|
|
|
|
SDL_Surface *surface = SDL_LoadBMP("kromasky_16x16.bmp");
|
|
|
|
if (!surface) {
|
|
printf("Error loading bitmap: %s\n", SDL_GetError());
|
|
return 0;
|
|
} else {
|
|
/* set the transparent color for the bitmap font (hot pink) */
|
|
SDL_SetColorKey(surface, 1, SDL_MapRGB(surface->format, 238, 0, 252));
|
|
/* now we convert the surface to our desired pixel format */
|
|
int format = SDL_PIXELFORMAT_ABGR8888; /* desired texture format */
|
|
Uint32 Rmask, Gmask, Bmask, Amask; /* masks for desired format */
|
|
int bpp; /* bits per pixel for desired format */
|
|
SDL_PixelFormatEnumToMasks(format, &bpp, &Rmask, &Gmask, &Bmask,
|
|
&Amask);
|
|
SDL_Surface *converted =
|
|
SDL_CreateRGBSurface(0, surface->w, surface->h, bpp, Rmask, Gmask,
|
|
Bmask, Amask);
|
|
SDL_BlitSurface(surface, NULL, converted, NULL);
|
|
/* create our texture */
|
|
texture =
|
|
SDL_CreateTextureFromSurface(renderer, converted);
|
|
if (texture == 0) {
|
|
printf("texture creation failed: %s\n", SDL_GetError());
|
|
} else {
|
|
/* set blend mode for our texture */
|
|
SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
|
|
}
|
|
SDL_FreeSurface(surface);
|
|
SDL_FreeSurface(converted);
|
|
return texture;
|
|
}
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
|
|
int index; /* index of last key we pushed in the bitmap font */
|
|
SDL_Window *window;
|
|
SDL_Event event; /* last event received */
|
|
SDL_Keymod mod; /* key modifiers of last key we pushed */
|
|
SDL_Scancode scancode; /* scancode of last key we pushed */
|
|
|
|
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
|
|
printf("Error initializing SDL: %s", SDL_GetError());
|
|
}
|
|
/* create window */
|
|
window = SDL_CreateWindow("iPhone keyboard test", 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, 0);
|
|
/* create renderer */
|
|
renderer = SDL_CreateRenderer(window, -1, 0);
|
|
|
|
/* load up our font */
|
|
loadFont();
|
|
|
|
/* draw the background, we'll just paint over it */
|
|
SDL_SetRenderDrawColor(renderer, bg_color.r, bg_color.g, bg_color.b, bg_color.a);
|
|
SDL_RenderFillRect(renderer, NULL);
|
|
SDL_RenderPresent(renderer);
|
|
|
|
int done = 0;
|
|
/* loop till we get SDL_Quit */
|
|
while (SDL_WaitEvent(&event)) {
|
|
switch (event.type) {
|
|
case SDL_QUIT:
|
|
done = 1;
|
|
break;
|
|
case SDL_KEYDOWN:
|
|
index = keyToIndex(event.key.keysym);
|
|
scancode = event.key.keysym.scancode;
|
|
mod = event.key.keysym.mod;
|
|
if (scancode == SDL_SCANCODE_DELETE) {
|
|
/* if user hit delete, delete the last character */
|
|
backspace();
|
|
lastCharWasColon = 0;
|
|
} else if (lastCharWasColon && scancode == SDL_SCANCODE_0
|
|
&& (mod & KMOD_SHIFT)) {
|
|
/* if our last key was a colon and this one is a close paren, the make a hoppy face */
|
|
backspace();
|
|
drawIndex(32); /* index for happy face */
|
|
numChars++;
|
|
drawCursor();
|
|
lastCharWasColon = 0;
|
|
} else if (index != -1) {
|
|
/* if we aren't doing a happy face, then just draw the normal character */
|
|
drawIndex(index);
|
|
numChars++;
|
|
drawCursor();
|
|
lastCharWasColon =
|
|
(event.key.keysym.scancode == SDL_SCANCODE_SEMICOLON
|
|
&& (event.key.keysym.mod & KMOD_SHIFT));
|
|
}
|
|
/* check if the key was a colon */
|
|
/* draw our updates to the screen */
|
|
SDL_RenderPresent(renderer);
|
|
break;
|
|
case SDL_MOUSEBUTTONUP:
|
|
/* mouse up toggles onscreen keyboard visibility */
|
|
if (SDL_IsTextInputActive()) {
|
|
SDL_StopTextInput();
|
|
} else {
|
|
SDL_StartTextInput();
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
cleanup();
|
|
return 0;
|
|
}
|
|
|
|
/* clean up after ourselves like a good kiddy */
|
|
void
|
|
cleanup(void)
|
|
{
|
|
SDL_DestroyTexture(texture);
|
|
SDL_Quit();
|
|
}
|