133 lines
4.0 KiB
C
133 lines
4.0 KiB
C
#include "fb.h"
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#include "mbox.h"
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#include "uart.h"
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#include "utils.h"
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#include <stdint.h>
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#define MBOX_TAG_FBALLOC 0x40001
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#define MBOX_TAG_FBGETPITCH 0x40008
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#define MBOX_TAG_FBSETPHYS 0x48003
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#define MBOX_TAG_FBSETVIRT 0x48004
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#define MBOX_TAG_FBSETDEPTH 0x48005
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#define MBOX_TAG_FBSETPIXORD 0x48006
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#define MBOX_TAG_FBSETOFF 0x48009
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/* PC Screen Font as used by Linux Console */
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typedef struct {
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unsigned int magic;
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unsigned int version;
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unsigned int headersize;
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unsigned int flags;
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unsigned int numglyph;
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unsigned int bytesperglyph;
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unsigned int height;
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unsigned int width;
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unsigned char glyphs;
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} __attribute__((packed)) psf_t;
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extern volatile unsigned char _binary_font_psf_start;
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static struct fbst fb;
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unsigned char *fb_init()
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{
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// sending many tags at once
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mbox[0] = 35 * 4;
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mbox[1] = MBOX_REQUEST;
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mbox[2] = MBOX_TAG_FBSETPHYS; // set phy wh
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mbox[3] = 8;
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mbox[4] = 0;
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mbox[5] = 1920; // FrameBufferInfo.width
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mbox[6] = 1080; // FrameBufferInfo.height
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mbox[7] = MBOX_TAG_FBSETVIRT; // set virt wh
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mbox[8] = 8;
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mbox[9] = 0;
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mbox[10] = 1920; // FrameBufferInfo.virtual_width
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mbox[11] = 1080; // FrameBufferInfo.virtual_height
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mbox[12] = MBOX_TAG_FBSETOFF; // set virt offset
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mbox[13] = 8;
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mbox[14] = 0;
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mbox[15] = 0; // FrameBufferInfo.x_offset
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mbox[16] = 0; // FrameBufferInfo.y.offset
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mbox[17] = MBOX_TAG_FBSETDEPTH; // set depth
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mbox[18] = 4;
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mbox[19] = 0;
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mbox[20] = 32; // FrameBufferInfo.depth
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mbox[21] = MBOX_TAG_FBSETPIXORD; // set pixel order
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mbox[22] = 4;
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mbox[23] = 0;
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mbox[24] = 1; // RGB, not BGR preferably
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mbox[25] = MBOX_TAG_FBALLOC; // get framebuffer, gets alignment on request
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mbox[26] = 8;
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mbox[27] = 0;
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mbox[28] = 4096; // FrameBufferInfo.pointer
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mbox[29] = 0; // FrameBufferInfo.size
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mbox[30] = MBOX_TAG_FBGETPITCH; // get pitch
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mbox[31] = 4;
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mbox[32] = 0;
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mbox[33] = 0; // FrameBufferInfo.pitch
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mbox[34] = MBOX_TAG_LAST;
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if (mbox_call(MBOX_CH_PROP, mbox) == 0 && mbox[20] == 32 && mbox[28] != 0) {
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mbox[28] &= 0x3FFFFFFF; // convert GPU address to ARM address
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fb.width = mbox[5]; // get actual physical width
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fb.height = mbox[6]; // get actual physical height
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fb.pitch = mbox[33]; // get number of bytes per line
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fb.isrgb = mbox[24]; // get the actual channel order
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fb.fbp = (void *)((unsigned long)mbox[28]);
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} else {
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puts("Unable to set framebuffer!\r\n");
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return 0;
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}
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return fb.fbp;
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}
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struct fbst * fb_get(){
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return &fb;
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}
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void fb_print(int x, int y, char *s)
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{
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// get our font
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psf_t *font = (psf_t *)&_binary_font_psf_start;
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// draw next character if it's not zero
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while (*s) {
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// get the offset of the glyph. Need to adjust this to support unicode table
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unsigned char *glyph =
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(unsigned char *)&_binary_font_psf_start + font->headersize +
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(*((unsigned char *)s) < font->numglyph ? *s : 0) * font->bytesperglyph;
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// calculate the offset on screen
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int offs = (y * fb.pitch) + (x * 4);
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// variables
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int line, mask, bytesperline = (font->width + 7) / 8;
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// handle carrige return
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if (*s == '\r') {
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x = 0;
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} else
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// new line
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if (*s == '\n') {
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x = 0;
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y += font->height;
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} else {
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// display a character
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for (unsigned int j = 0; j < font->height; j++) {
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// display one row
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line = offs;
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mask = 1 << (font->width - 1);
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for (unsigned int i = 0; i < font->width; i++) {
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// if bit set, we use white color, otherwise black
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*((unsigned int *)(fb.fbp + line)) = ((int)*glyph) & mask ? 0xFFFFFF : 0;
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mask >>= 1;
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line += 4;
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}
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// adjust to next line
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glyph += bytesperline;
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offs += fb.pitch;
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}
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x += (font->width + 1);
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}
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// next character
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s++;
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}
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}
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