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tgVideoOut.cpp
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tgVideoOut.cpp
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#include "tgVideoOut.h"
#include <SDL2/SDL.h>
static uint32_t tgputChar( tangerineCtx_t *ctx, uint16_t *frameBuffer, uint16_t x, uint16_t y, uint8_t letter, uint8_t format )
{
uint16_t cx;
uint16_t cy;
uint16_t cxMax;
uint16_t cyMax;
uint16_t cxStep;
uint16_t cyStep;
uint8_t *letterPtr;
uint8_t letterData;
uint16_t letterColor = 0xffff;
uint16_t backgroundColor = 0x0000;
uint16_t pixel;
letterPtr = &ctx->consoleFont[ letter * 8 ];
//letter color
switch( format & 0x0f )
{
case 0:
letterColor = tgColor565( 0x00, 0x00, 0x00 );
break;
case 1:
letterColor = tgColor565( 0x80, 0x00, 0x00 );
break;
case 2:
letterColor = tgColor565( 0x00, 0x80, 0x00 );
break;
case 3:
letterColor = tgColor565( 0x00, 0x00, 0x80 );
break;
case 4:
letterColor = tgColor565( 0x80, 0x80, 0x00 );
break;
case 5:
letterColor = tgColor565( 0x00, 0x80, 0x80 );
break;
case 6:
letterColor = tgColor565( 0x80, 0x00, 0x80 );
break;
case 7:
letterColor = tgColor565( 0x40, 0x40, 0x40 );
break;
case 8:
letterColor = tgColor565( 0x80, 0x80, 0x80 );
break;
case 9:
letterColor = tgColor565( 0xff, 0x00, 0x00 );
break;
case 10:
letterColor = tgColor565( 0x00, 0xff, 0x00 );
break;
case 11:
letterColor = tgColor565( 0x00, 0x00, 0xff );
break;
case 12:
letterColor = tgColor565( 0xff, 0xff, 0x00 );
break;
case 13:
letterColor = tgColor565( 0x00, 0xff, 0xff );
break;
case 14:
letterColor = tgColor565( 0xff, 0x00, 0xff );
break;
case 15:
letterColor = tgColor565( 0xff, 0xff, 0xff );
break;
}
//background color
switch( ( format >> 4 ) & 0x0f )
{
case 0:
backgroundColor = tgColor565( 0x00, 0x00, 0x00 );
break;
case 1:
backgroundColor = tgColor565( 0x80, 0x00, 0x00 );
break;
case 2:
backgroundColor = tgColor565( 0x00, 0x80, 0x00 );
break;
case 3:
backgroundColor = tgColor565( 0x00, 0x00, 0x80 );
break;
case 4:
backgroundColor = tgColor565( 0x80, 0x80, 0x00 );
break;
case 5:
backgroundColor = tgColor565( 0x00, 0x80, 0x80 );
break;
case 6:
backgroundColor = tgColor565( 0x80, 0x00, 0x80 );
break;
case 7:
backgroundColor = tgColor565( 0x20, 0x20, 0x20 );
break;
case 8:
backgroundColor = tgColor565( 0x80, 0x80, 0x80 );
break;
case 9:
backgroundColor = tgColor565( 0xff, 0x00, 0x00 );
break;
case 10:
backgroundColor = tgColor565( 0x00, 0xff, 0x00 );
break;
case 11:
backgroundColor = tgColor565( 0x00, 0x00, 0xff );
break;
case 12:
backgroundColor = tgColor565( 0xff, 0xff, 0x00 );
break;
case 13:
backgroundColor = tgColor565( 0x00, 0xff, 0xff );
break;
case 14:
backgroundColor = tgColor565( 0xff, 0x00, 0xff );
break;
case 15:
backgroundColor = tgColor565( 0xff, 0xff, 0xff );
break;
}
if( ctx->rootRegs.videoMuxMode & 0x04 )
{
//80 column mode
x *= 8;
cxMax = 8;
cxStep = 1;
}
else
{
//40 column mode
x *= 16;
cxMax = 16;
cxStep = 2;
}
if( ctx->rootRegs.videoMuxMode & 0x08 )
{
//60 row mode
y *= 8;
cyMax = 8;
cyStep = 1;
}
else
{
//30 row mode
y *= 16;
cyMax = 16;
cyStep = 2;
}
for( cy = 0; cy < cyMax; cy += cyStep )
{
letterData = *letterPtr++;
for( cx = 0; cx < cxMax; cx += cxStep )
{
if( letterData & 0x80 )
{
frameBuffer[ ( ( cy + y ) * 640 ) + cx + x ] = letterColor;
if( cyStep == 2 )
{
frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x ] = letterColor;
}
if( cxStep == 2 )
{
//40 columns
frameBuffer[ ( ( cy + y ) * 640 ) + cx + x + 1 ] = letterColor;
if( cyStep == 2 )
{
frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x + 1 ] = letterColor;
}
}
}
else
{
if( ctx->rootRegs.videoMuxMode & 0x02 )
{
//mix gfx with text
if( backgroundColor != 0x0000 )
{
if( backgroundColor != tgColor565( 0x80, 0x80, 0x80 ) )
{
//background color
frameBuffer[ ( ( cy + y ) * 640 ) + cx + x ] = backgroundColor;
if( cyStep == 2 )
{
frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x ] = backgroundColor;
}
if( cxStep == 2 )
{
//40 columns
frameBuffer[ ( ( cy + y ) * 640 ) + cx + x + 1 ] = backgroundColor;
if( cyStep == 2 )
{
frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x + 1 ] = backgroundColor;
}
}
}
else
{
//dim background
pixel = frameBuffer[ ( ( cy + y ) * 640 ) + cx + x ];
frameBuffer[ ( ( cy + y ) * 640 ) + cx + x ] = tgColor565( tgColor565GetR( pixel ) >> 1,
tgColor565GetG( pixel ) >> 1, tgColor565GetB( pixel ) >> 1 );
if( cyStep == 2 )
{
pixel = frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x ];
frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x ] = tgColor565( tgColor565GetR( pixel ) >> 1,
tgColor565GetG( pixel ) >> 1, tgColor565GetB( pixel ) >> 1 );
}
if( cxStep == 2 )
{
pixel = frameBuffer[ ( ( cy + y ) * 640 ) + cx + x + 1 ];
frameBuffer[ ( ( cy + y ) * 640 ) + cx + x + 1 ] = tgColor565( tgColor565GetR( pixel ) >> 1,
tgColor565GetG( pixel ) >> 1, tgColor565GetB( pixel ) >> 1 );
if( cyStep == 2)
{
pixel = frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x + 1 ];
frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x + 1 ] = tgColor565( tgColor565GetR( pixel ) >> 1,
tgColor565GetG( pixel ) >> 1, tgColor565GetB( pixel ) >> 1 );
}
}
}
}
}
else
{
//text only
frameBuffer[ ( ( cy + y ) * 640 ) + cx + x ] = backgroundColor;
if( cyStep == 2 )
{
frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x ] = backgroundColor;
}
if( cxStep == 2 )
{
//40 columns
frameBuffer[ ( ( cy + y ) * 640 ) + cx + x + 1 ] = backgroundColor;
if( cyStep == 2 )
{
frameBuffer[ ( ( cy + y + 1 ) * 640 ) + cx + x + 1 ] = backgroundColor;
}
}
}
}
letterData <<= 1;
}
}
return 0;
}
uint32_t tgRedrawScreen( tangerineCtx_t *ctx )
{
int texturePitch;
void *texturePixels;
uint16_t *frameBuffer;
uint8_t *frameBufferB;
uint16_t *textureBuffer;
uint16_t *textureRowBuffer;
uint16_t pixel;
uint32_t paletteEntryValue;
uint8_t *textOverlayPtr;
uint32_t toWidth;
uint32_t toHeight;
uint8_t letter;
uint8_t format;
uint32_t x;
uint32_t y;
SDL_LockTexture( ctx->texture, NULL, &texturePixels, &texturePitch );
switch( ctx->rootRegs.videoMuxMode )
{
case _VIDEOMODE_640_TEXT40_OVER_GFX:
case _VIDEOMODE_640_TEXT80_OVER_GFX:
case _VIDEOMODE_640_TEXT80_60_OVER_GFX:
frameBuffer = &( (uint16_t*) ctx->dmaRAM )[ ctx->sdramDMARegs.ch3DmaPointerStart << 1 ];
textureBuffer = (uint16_t*)texturePixels;
for( y = 0; y < 480; y++ )
{
textureRowBuffer = &textureBuffer[ y * 640 ];
for( x = 0; x < 320; x++ )
{
*textureRowBuffer++ = *frameBuffer++;
}
frameBuffer += ( ctx->sdramDMARegs.ch3DmaRequest0Modulo << 1 );
for( x = 320; x < 640; x++ )
{
*textureRowBuffer++ = *frameBuffer++;
}
frameBuffer += ( ctx->sdramDMARegs.ch3DmaRequest1Modulo << 1 );
}
break;
case _VIDEOMODE_320_TEXT40_OVER_GFX:
case _VIDEOMODE_320_TEXT80_OVER_GFX:
case _VIDEOMODE_320_TEXT80_60_OVER_GFX:
frameBuffer = &( ( uint16_t * ) ctx->dmaRAM )[ ctx->sdramDMARegs.ch3DmaPointerStart << 1 ];
textureBuffer = ( uint16_t * )texturePixels;
for( y = 0; y < 240; y++ )
{
for( x = 0; x < 320; x++ )
{
pixel = *frameBuffer++;
textureBuffer[ ( x * 2 ) + ( y * 2 ) * 640 ] = pixel;
textureBuffer[ ( x * 2 ) + 1 + ( y * 2 ) * 640 ] = pixel;
textureBuffer[ ( x * 2 ) + ( ( y * 2 ) + 1 ) * 640 ] = pixel;
textureBuffer[ ( x * 2 ) + 1 + ( ( y * 2 ) + 1 ) * 640 ] = pixel;
}
if( y & 1 )
{
frameBuffer += ( ctx->sdramDMARegs.ch3DmaRequest1Modulo << 1 );
}
else
{
frameBuffer += ( ctx->sdramDMARegs.ch3DmaRequest0Modulo << 1 );
}
}
break;
case _VIDEOMODE_320_8BPP_TEXT40_OVER_GFX:
case _VIDEOMODE_320_8BPP_TEXT80_OVER_GFX:
case _VIDEOMODE_320_8BPP_TEXT80_60_OVER_GFX:
frameBufferB = &( ( uint8_t * ) ctx->dmaRAM )[ ctx->sdramDMARegs.ch3DmaPointerStart << 2 ];
textureBuffer = ( uint16_t * )texturePixels;
for( y = 0; y < 240; y++ )
{
for( x = 0; x < 320; x++ )
{
paletteEntryValue = ctx->gfxPixelGenRegs.palette[ *frameBufferB++ ];
pixel = tgColor565( ( ( paletteEntryValue >> 16 ) & 0xff ), ( ( paletteEntryValue >> 8 ) & 0xff ), ( paletteEntryValue & 0xff ) );
textureBuffer[ ( x * 2 ) + ( y * 2 ) * 640 ] = pixel;
textureBuffer[ ( x * 2 ) + 1 + ( y * 2 ) * 640 ] = pixel;
textureBuffer[ ( x * 2 ) + ( ( y * 2 ) + 1 ) * 640 ] = pixel;
textureBuffer[ ( x * 2 ) + 1 + ( ( y * 2 ) + 1 ) * 640 ] = pixel;
}
if( y & 1 )
{
frameBufferB += ( ctx->sdramDMARegs.ch3DmaRequest1Modulo << 2 );
}
else
{
frameBufferB += ( ctx->sdramDMARegs.ch3DmaRequest0Modulo << 2 );
}
}
break;
}
//text overlay
if( ctx->rootRegs.videoMuxMode & 0x04 )
{
//80 column mode
toWidth = 80;
}
else
{
//40 column mode
toWidth = 40;
}
if( ctx->rootRegs.videoMuxMode & 0x08 )
{
//60 row mode
toHeight = 60;
}
else
{
//30 column mode
toHeight = 30;
}
textOverlayPtr = &((uint8_t*)ctx->systemRAM)[0x5a80];
for( y = 0; y < toHeight; y++ )
{
for( x = 0; x < toWidth; x++ )
{
letter = *textOverlayPtr++;
format = *textOverlayPtr++;
tgputChar( ctx, (uint16_t*)texturePixels, x, y, letter, format );
}
}
SDL_UnlockTexture( ctx->texture );
SDL_RenderClear( ctx->renderer );
SDL_RenderCopy( ctx->renderer, ctx->texture, NULL, NULL );
SDL_RenderPresent( ctx->renderer );
return RV_OK;
}