struct FrameBufferInfo * InitializeFrameBuffer(uint32_t width, uint32_t height, uint32_t depth)
{
if (width > 4096 || height > 4096 || depth > 32)
return 0;
FrameBufferInfo.width = width;
FrameBufferInfo.height = height;
FrameBufferInfo.vWidth = width;
FrameBufferInfo.vHeight = height;
FrameBufferInfo.pitch = 0;
FrameBufferInfo.depth = depth;
FrameBufferInfo.x = 0;
FrameBufferInfo.y = 0;
FrameBufferInfo.pointer = 0;
FrameBufferInfo.size = 0;
uart_puts("MailboxWrite\r\n");
uint32_t value = (uint32_t)(&FrameBufferInfo) | 0x40000000;
MailboxWrite(value, CHANNEL_GPU);
uint32_t mail = 0;
do {
uart_puts("MailboxRead\r\n");
mail = MailboxRead(CHANNEL_GPU);
} while ((mail != 0) && (FrameBufferInfo.pointer == 0));
return &FrameBufferInfo;
}
/*------------------------------------------------------------------------------------
The main program
------------------------------------------------------------------------------------*/
void main(uint32_t r0, uint32_t r1, uint32_t atags)
{
UNUSED(r0);
UNUSED(r1);
UNUSED(atags);
// Write and read from the mailbox and then display the color image
MailboxWrite(&FrameBufferInfo,1);
MailboxRead(1);
uint16_t *p = FrameBufferInfo.vBuffPointer;
displayImage16(&colorImage, p);
} // End kernel_main
unsigned int InitGraphics(unsigned int screenWidth, unsigned int screenHeight, unsigned int bitDepth)
{
//set global parameters
m_screenWidth = screenWidth;
m_screenHeight = screenHeight;
m_bitDepth = bitDepth;
//Set up the frame buffer info
//physical width of the screen
PutUInt32(0x40040000, m_screenWidth);
//physical height of the screen
PutUInt32(0x40040004, m_screenHeight);
//virtual width of the screen
PutUInt32(0x40040008, m_screenWidth);
// virtual height of the screen
PutUInt32(0x4004000C, m_screenHeight);
//pitch ( number of bytes between each row of the frame buffer) set by the GPU ( set to 0 for now )
PutUInt32(0x40040010, 0);
//bit depth
PutUInt32(0x40040014, m_bitDepth);
// X offset
PutUInt32(0x40040018, 0);
// Y offset
PutUInt32(0x4004001C, 0);
// pointer returned by the GPU ( set to 0 for now )r
PutUInt32(0x40040020, 0);
// size of the frame buffer, set by the GPU ( set to 0 for now )
PutUInt32(0x40040024, 0);
// !!!! This seems to break the system, looks like we dont need to add on 0x40000000. !!!!
// add on 0x40000000 into the value in the frame buffer to specify how to write it to the structure, this will make the GPU clear its cache so we can see the result
//PutUInt32(0x40040000, (GetUInt32(0x40040000) + 0x40000000));
// send the frame buffer info to channel 1
if (MailboxWrite(0x40040000, 1) == 0)
{
return 0;
}
unsigned int frameBufferResponce;
frameBufferResponce = MailboxRead(1);
if (frameBufferResponce == 0)
{
m_framebufferAddress = GetUInt32(0x40040020);
return 1;
}
return 0;
}
//------------------------------------------------------------------------
int notmain ( void )
{
unsigned int ra,rb;
unsigned int ry,rx;
uart_init();
hexstring(0x12345678);
hexstring(GETPC());
timer_init();
PUT32(0x40040000, 640); /* #0 Physical Width */
PUT32(0x40040004, 480); /* #4 Physical Height */
PUT32(0x40040008, 640); /* #8 Virtual Width */
PUT32(0x4004000C, 480); /* #12 Virtual Height */
PUT32(0x40040010, 0); /* #16 GPU - Pitch */
PUT32(0x40040014, 32); /* #20 Bit Depth */
PUT32(0x40040018, 0); /* #24 X */
PUT32(0x4004001C, 0); /* #28 Y */
PUT32(0x40040020, 0); /* #32 GPU - Pointer */
PUT32(0x40040024, 0); /* #36 GPU - Size */
hexstring(MailboxWrite(0x40040000,1));
hexstring(MailboxRead(1));
rb=0x40040000;
for(ra=0;ra<10;ra++)
{
hexstrings(rb); hexstring(GET32(rb));
rb+=4;
}
rb=GET32(0x40040020);
hexstring(rb);
for(ra=0;ra<10000;ra++)
{
PUT32(rb,~((ra&0xFF)<<0));
rb+=4;
}
for(ra=0;ra<10000;ra++)
{
PUT32(rb,~((ra&0xFF)<<8));
rb+=4;
}
for(ra=0;ra<10000;ra++)
{
PUT32(rb,~((ra&0xFF)<<16));
rb+=4;
}
for(ra=0;ra<10000;ra++)
{
PUT32(rb,~((ra&0xFF)<<24));
rb+=4;
}
rb=GET32(0x40040020);
hexstring(rb);
ra=0;
for(ry=0;ry<480;ry++)
{
for(rx=0;rx<480;rx++)
{
PUT32(rb,image_data[ra++]);
rb+=4;
}
for(;rx<640;rx++)
{
PUT32(rb,0);
rb+=4;
}
}
return(0);
}
int FramebufferInitialize() {
uint32 retval=0;
volatile unsigned int mb[100] __attribute__ ((aligned(16)));
depth = 24;
//
// Tout d'abord, on veut récupérer l'adresse en mémoire du framebuffer
//
mb[0] = 8 * 4; // Taille du buffer i.e. de notre message à envoyer dans la mailbox
mb[1] = 0; // On spécifie qu'on demande quelque chose
mb[2] = 0x00040003; // La question que l'on pose: https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
mb[3] = 2*4; // La taille de la réponse
mb[4] = 0; // On indique que c'est une question ou un réponse (0 question)
mb[5] = 0; // Largeur
mb[6] = 0; // Hauteur
mb[7] = 0; // Marqueur de fin
MailboxWrite((uint32)(mb+0x40000000), 8); // On écrit le message dans la mailbox
if(((retval = MailboxRead(8)) == 0) || (mb[1] != 0x80000000)){ // On vérifie que le message est passé
return 0;
}
fb_x = mb[5]; // On récupére la largeur en pixel de l'écran
fb_y = mb[6]; // On récupére la hauteur en pixel de l'écran
uint32 mb_pos=1;
mb[mb_pos++] = 0; // C'est une requête
mb[mb_pos++] = 0x00048003; // On définit la hauteur et la largeur du framebuffer
mb[mb_pos++] = 2*4; // On envoi 2 int pour la taille donc on spécifie la taille du buffer
mb[mb_pos++] = 2*4; // Taille du message (tag + indicateur de requête)
mb[mb_pos++] = fb_x; // On passe la largeur
mb[mb_pos++] = fb_y; // On passe la hauteur
mb[mb_pos++] = 0x00048004; // On définit la hauteur et la largeur virtuel du framebuffer
mb[mb_pos++] = 2*4; // On envoi 2 int pour la taille donc on spécifie la taille du buffer
mb[mb_pos++] = 2*4; // Taille du message (tag + indicateur de requête)
mb[mb_pos++] = fb_x; // On passe la largeur
mb[mb_pos++] = fb_y; // On passe la hauteur
mb[mb_pos++] = 0x00048005; // On définit la profondeur du frame buffer
mb[mb_pos++] = 1*4;
mb[mb_pos++] = 1*4;
mb[mb_pos++] = depth; // Profondeur i.e. nombre de couleur (24bit dans notre cas)
mb[mb_pos++] = 0x00040001; // On demande l'allocation du buffer
mb[mb_pos++] = 2*4;
mb[mb_pos++] = 2*4;
mb[mb_pos++] = 16;
mb[mb_pos++] = 0;
mb[mb_pos++] = 0; // Tag de fin de message
mb[0] = mb_pos*4; // Taille du message dans son entier
MailboxWrite((uint32)(mb+0x40000000), 8); // On écrit dans la mailbox
if(((retval = MailboxRead(8)) == 0) || (mb[1] != 0x80000000)){ // On vérifie que le message a bien été passé
return 0;
}
/*
* On récupére les différente information récupérer de la requête pour pouvoir reconstruire l'adresse du framebuffer et sa taille
*/
mb_pos = 2;
unsigned int val_buff_len=0;
while(mb[mb_pos] != 0){
switch(mb[mb_pos++])
{
case 0x00048003:
val_buff_len = mb[mb_pos++];
mb_pos+= (val_buff_len/4)+1;
break;
case 0x00048004:
val_buff_len = mb[mb_pos++];
mb_pos+= (val_buff_len/4)+1;
break;
case 0x00048005:
val_buff_len = mb[mb_pos++];
mb_pos+= (val_buff_len/4)+1;
break;
case 0x00040001:
val_buff_len = mb[mb_pos++];
mb_pos++;
fb_address = mb[mb_pos++];
fb_size_bytes = mb[mb_pos++];
break;
}
}
//
// Récupére le pitch (This indicates the number of bytes between rows. Usually it will be related to the width, but there are exceptions such as when drawing only part of an image.)
//
mb[0] = 8 * 4; // Taille du buffer
mb[1] = 0; // C'est une requête
mb[2] = 0x00040008; // On veut récupérer le pitch
mb[3] = 4; // Taille du buffer
mb[4] = 0; // Taille de la demande
mb[5] = 0; // Le pitch sera stocké ici
mb[6] = 0; // Tag de fin de message
mb[7] = 0;
MailboxWrite((uint32)(mb+0x40000000), 8);
if(((retval = MailboxRead(8)) == 0) || (mb[1] != 0x80000000)){
return 0;
}
pitch = mb[5];
fb_x--;
fb_y--;
return 1;
}
int notmain ( void )
{
static volatile unsigned int FB[] __attribute__((aligned (16))) = {
640, 480,
640, 480,
0,
24,
0, 0,
0, 0
};
MailboxWrite(((unsigned int)FB)+0x40000000, 1);
assert(MailboxRead(1) == 0); // TODO: check?
{
unsigned int ptr = FB[8];
int i;
for(i=0;i<640*480;i++) {
PUT8(ptr++,0x00);
PUT8(ptr++,0xFF);
PUT8(ptr++,0x00);
}
}
/*
{
unsigned int ptr = FB[8];
ptr += 640*10*3 + 50;
int idx = 0;
int i, j;
for(i=0;i<10;i++) {
for(j=0;j<10;j++) {
PUT8(ptr++,image_smile[idx++]);
PUT8(ptr++,image_smile[idx++]);
PUT8(ptr++,image_smile[idx++]);
}
for(;j<640;j++) {
PUT8(ptr++, 0x00);
PUT8(ptr++, 0x00);
PUT8(ptr++, 0x00);
}
}
}
{
unsigned int ptr = FB[8];
ptr += 640*30*3 + 50;
int idx = 0;
int i, j;
for(i=0;i<105;i++) {
for(j=0;j<288;j++) {
PUT8(ptr++,image_ceu[idx+0]);
PUT8(ptr++,image_ceu[idx+2]); // TODO: why?
PUT8(ptr++,image_ceu[idx+1]); // TODO: why?
idx += 3;
}
for(;j<640;j++) {
PUT8(ptr++, 0x00);
PUT8(ptr++, 0x00);
PUT8(ptr++, 0x00);
}
}
}
*/
return(0);
}