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Various improvements and code re-organisation: Optimised assembler LCD rendering function for the iPod 5G by me and an optimisations to the sprite drawing routines courtesy of stripwax (these improvements make pacbox almost realtime on the iPod 5G). MENU+SELECT now brings up the menu on the iPod instead of the hold switch.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9018 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2006-03-13 01:42:11 +00:00
parent b1b0e42ddd
commit ad8b24d90c
8 changed files with 422 additions and 191 deletions
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63
apps/plugins/pacbox/arcade.c
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@ -252,19 +252,19 @@ static unsigned decodePaletteByte( unsigned char value )
unsigned bit0, bit1, bit2;
unsigned red, green, blue;
bit0 = (value >> 0) & 0x01;
bit1 = (value >> 1) & 0x01;
bit2 = (value >> 2) & 0x01;
red = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = (value >> 0) & 0x01;
bit1 = (value >> 1) & 0x01;
bit2 = (value >> 2) & 0x01;
red = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = (value >> 3) & 0x01;
bit1 = (value >> 4) & 0x01;
bit2 = (value >> 5) & 0x01;
green = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit1 = (value >> 4) & 0x01;
bit2 = (value >> 5) & 0x01;
green = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = 0;
bit1 = (value >> 6) & 0x01;
bit2 = (value >> 7) & 0x01;
bit1 = (value >> 6) & 0x01;
bit2 = (value >> 7) & 0x01;
blue = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
return (blue << 16 ) | (green << 8) | red;
@ -428,6 +428,7 @@ inline void drawSprite( unsigned char * buffer, int index )
{
struct PacmanSprite ps = sprites_[index];
int x,y;
char * s, * s2;
// Exit now if sprite not visible at all
if( (ps.color == 0) || (ps.x >= ScreenWidth) || (ps.y < 16) || (ps.y >= (ScreenHeight-32)) ) {
@ -436,59 +437,77 @@ inline void drawSprite( unsigned char * buffer, int index )
// Clip the sprite coordinates to cut the parts that fall off the screen
int start_x = (ps.x < 0) ? 0 : ps.x;
int end_x = (ps.x < (ScreenWidth-16)) ? ps.x+16 : ScreenWidth;
int end_x = (ps.x < (ScreenWidth-16)) ? ps.x+15 : ScreenWidth-1;
// Prepare variables for drawing
int color = (ps.color & 0x3F)*4;
unsigned char * spritemap_base = spritemap_ + ((ps.n & 0x3F)*256);
buffer += ScreenWidth*ps.y;
s2 = &spritemap_base[start_x-ps.x];
dirty_[(start_x >> 3) + (ps.y >> 3)*28] = 1;
dirty_[(start_x >> 3) + 1 + (ps.y >> 3)*28] = 1;
dirty_[(end_x >> 3) + (ps.y >> 3)*28] = 1;
dirty_[(start_x >> 3) + ((ps.y >> 3)+1)*28] = 1;
dirty_[(start_x >> 3) + 1 + ((ps.y >> 3)+1)*28] = 1;
dirty_[(end_x >> 3) + ((ps.y >> 3)+1)*28] = 1;
dirty_[(start_x >> 3) + ((ps.y+15) >> 3)*28] = 1;
dirty_[(start_x >> 3) + 1 + ((ps.y+15) >> 3)*28] = 1;
dirty_[(end_x >> 3) + ((ps.y+15) >> 3)*28] = 1;
// Draw the 16x16 sprite
if( ps.mode == 0 ) { // Normal
// Draw the 16x16 sprite
for( y=0; y<16; y++ ) {
char* s = &spritemap_base[start_x-ps.x+y*16];
for( x=start_x; x<end_x; x++ ) {
for( y=15; y>=0; y-- ) {
s = s2;
for( x=start_x; x<=end_x; x++ ) {
int c = *(s++);
if( c ) {
buffer[x] = c + color;
}
}
buffer += ScreenWidth;
s2 += 16;
}
} else if( ps.mode == 1 ) { // Flip Y
for( y=0; y<16; y++ ) {
char* s = &spritemap_base[start_x-ps.x+(15-y)*16];
for( x=start_x; x<end_x; x++ ) {
s2 += 240;
for( y=15; y>=0; y-- ) {
s = s2;
for( x=start_x; x<=end_x; x++ ) {
int c = *(s++);
if( c ) {
buffer[x] = c + color;
}
}
buffer += ScreenWidth;
s2 -= 16;
}
} else if( ps.mode == 2 ) { // Flip X
for( y=0; y<16; y++ ) {
char* s = &spritemap_base[15-start_x+ps.x+y*16];
for( x=start_x; x<end_x; x++ ) {
s2 += 15;
for( y=15; y>=-0; y-- ) {
s = s2;
for( x=start_x; x<=end_x; x++ ) {
int c = *(s--);
if( c ) {
buffer[x] = c + color;
}
}
buffer += ScreenWidth;
s2 += 16;
}
} else { // Flip X and Y
for( y=0; y<16; y++ ) {
char* s = &spritemap_base[15-start_x+ps.x+(15-y)*16];
for( x=start_x; x<end_x; x++ ) {
s2 += 255;
for( y=15; y>=0; y-- ) {
s = s2;
for( x=start_x; x<=end_x; x++ ) {
int c = *(s--);
if( c ) {
buffer[x] = c + color;
}
}
buffer += ScreenWidth;
s2 -= 16;
}
}
}