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#include "../drivers/uart.h"
#include "../graphics/mbox.h"
#include "../graphics/homer.h"
unsigned int width, height, pitch, isrgb; /* dimensions and channel order */
unsigned char *lfb; /* raw frame buffer address */
/**
* Set screen resolution to 1024x768
*/
void lfb_init()
{
mbox[0] = 35*4;
mbox[1] = MBOX_REQUEST;
mbox[2] = 0x48003; //set phy wh
mbox[3] = 8;
mbox[4] = 8;
mbox[5] = 1024; //FrameBufferInfo.width
mbox[6] = 768; //FrameBufferInfo.height
mbox[7] = 0x48004; //set virt wh
mbox[8] = 8;
mbox[9] = 8;
mbox[10] = 1024; //FrameBufferInfo.virtual_width
mbox[11] = 768; //FrameBufferInfo.virtual_height
mbox[12] = 0x48009; //set virt offset
mbox[13] = 8;
mbox[14] = 8;
mbox[15] = 0; //FrameBufferInfo.x_offset
mbox[16] = 0; //FrameBufferInfo.y.offset
mbox[17] = 0x48005; //set depth
mbox[18] = 4;
mbox[19] = 4;
mbox[20] = 32; //FrameBufferInfo.depth
mbox[21] = 0x48006; //set pixel order
mbox[22] = 4;
mbox[23] = 4;
mbox[24] = 1; //RGB, not BGR preferably
mbox[25] = 0x40001; //get framebuffer, gets alignment on request
mbox[26] = 8;
mbox[27] = 8;
mbox[28] = 4096; //FrameBufferInfo.pointer
mbox[29] = 0; //FrameBufferInfo.size
mbox[30] = 0x40008; //get pitch
mbox[31] = 4;
mbox[32] = 4;
mbox[33] = 0; //FrameBufferInfo.pitch
mbox[34] = MBOX_TAG_LAST;
//this might not return exactly what we asked for, could be
//the closest supported resolution instead
if(mbox_call(MBOX_CH_PROP) && mbox[20]==32 && mbox[28]!=0) {
mbox[28]&=0x3FFFFFFF; //convert GPU address to ARM address
width=mbox[5]; //get actual physical width
height=mbox[6]; //get actual physical height
pitch=mbox[33]; //get number of bytes per line
isrgb=mbox[24]; //get the actual channel order
lfb=(void*)((unsigned long)mbox[28]);
} else {
uart_string("Unable to set screen resolution to 1024x768x32\n");
}
}
/**
* Show a picture
*/
void lfb_showpicture()
{
unsigned int x,y;
unsigned char *ptr=lfb;
char *data=homer_data, pixel[4];
ptr += (height-homer_height)/2*pitch + (width-homer_width)*2;
for(y=0;y<homer_height;y++) {
for(x=0;x<homer_width;x++) {
HEADER_PIXEL(data, pixel);
// the image is in RGB. So if we have an RGB framebuffer, we can copy the pixels
// directly, but for BGR we must swap R (pixel[0]) and B (pixel[2]) channels.
*((unsigned int*)ptr)=isrgb ? *((unsigned int *)&pixel) : (unsigned int)(pixel[0]<<16 | pixel[1]<<8 | pixel[2]);
ptr+=4;
}
ptr+=pitch-homer_width*4;
}
}
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