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grguLfb.cpp
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grguLfb.cpp
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//**************************************************************
//* OpenGLide - Glide to OpenGL Wrapper
//* http://openglide.sourceforge.net
//*
//* Linear Frame Buffer Functions
//*
//* OpenGLide is OpenSource under LGPL license
//* Originally made by Fabio Barros
//* Modified by Paul for Glidos (http://www.glidos.net)
//* Linux version by Simon White
//**************************************************************
#include "GlOgl.h"
#include "Glextensions.h"
#include "GLRender.h"
#include "FormatConversion.h"
#define BLUE_SCREEN (0x07FF)
//*************************************************
FX_ENTRY FxBool FX_CALL
grLfbLock( GrLock_t dwType,
GrBuffer_t dwBuffer,
GrLfbWriteMode_t dwWriteMode,
GrOriginLocation_t dwOrigin,
FxBool bPixelPipeline,
GrLfbInfo_t *lfbInfo )
{
#ifdef OGL_CRITICAL
GlideMsg( "grLfbLock( %d, %d, %d, %d, %d, --- )\n", dwType, dwBuffer, dwWriteMode, dwOrigin, bPixelPipeline );
#endif
RenderDrawTriangles( );
if ( dwType & 1 )
{
Glide.DstBuffer.Lock = true;
Glide.DstBuffer.Type = dwType;
Glide.DstBuffer.Buffer = dwBuffer;
Glide.DstBuffer.WriteMode = dwWriteMode;
Glide.DstBuffer.PixelPipeline = bPixelPipeline;
lfbInfo->lfbPtr = Glide.DstBuffer.Address;
}
else
{
FxU32 j;
glReadBuffer( dwBuffer == GR_BUFFER_BACKBUFFER
? GL_BACK : GL_FRONT );
// BGRA has been tested to be the fastest way to read pixels
// Reading pixels in one of the 565 modes is way slower than reading BGRA and converting to 565 later
// This may change with new drivers/graphics hardware...
// if anyone can show a faster way to read pixels, suggestions welcome :-)
glReadPixels( 0, 0,
OpenGL.WindowWidth, OpenGL.WindowHeight,
GL_BGRA, GL_UNSIGNED_BYTE,
(void *)OpenGL.tmpBuf );
if ( dwOrigin == GR_ORIGIN_UPPER_LEFT )
{
// When the OpenGL resolution differs from the Glide resolution,
// the content of the read buffer must be scaled
if ( OpenGL.WindowTotalPixels != Glide.WindowTotalPixels ) {
const FxU32* src;
FxU16* dst = Glide.SrcBuffer.Address;
const FxU32 xratio = (OpenGL.WindowWidth << 16) / (Glide.WindowWidth);
const FxU32 yratio = (OpenGL.WindowHeight << 16) / (Glide.WindowHeight);
FxU32 u, v = 0, x, y;
for ( y = 0; y < Glide.WindowHeight; y++ )
{
src = OpenGL.tmpBuf + (OpenGL.WindowHeight -1 - (v >> 16)) * OpenGL.WindowWidth;
u = 0;
for ( x = 0; x < Glide.WindowWidth; x++ )
{
// Resize and convert from 888 to 565
FxU32 pixel = src[u >> 16];
*dst++ = ( FxU16 ) (
( pixel & 0x00F80000 ) >> 8 |
( pixel & 0x0000FC00 ) >> 5 |
( pixel & 0x000000F8 ) >> 3 );
u += xratio;
}
v += yratio;
}
} else {
for ( j = 0; j < Glide.WindowHeight; j++ )
{
Convert8888to565( OpenGL.tmpBuf + ( ( ( Glide.WindowHeight ) - 1 - j ) * Glide.WindowWidth ),
Glide.SrcBuffer.Address + ( j * Glide.WindowWidth ),
Glide.WindowWidth );
}
}
}
else
{
if ( OpenGL.WindowTotalPixels != Glide.WindowTotalPixels ) {
// Copy and scale
const FxU32* src;
FxU16* dst = Glide.SrcBuffer.Address;
const FxU32 xratio = (OpenGL.WindowWidth << 16) / Glide.WindowWidth;
const FxU32 yratio = (OpenGL.WindowHeight << 16) / Glide.WindowHeight;
FxU32 u, v = 0, x, y;
for ( y = 0; y < Glide.WindowHeight; y++ )
{
src = OpenGL.tmpBuf + (v >> 16) * OpenGL.WindowWidth;
u = 0;
for( x = 0; x < Glide.WindowWidth; x++ )
{
// Resize and convert from 888 to 565
FxU32 pixel = src[u >> 16];
*dst++ = ( FxU16 ) (
( pixel & 0x00F80000 ) >> 8 |
( pixel & 0x0000FC00 ) >> 5 |
( pixel & 0x000000F8 ) >> 3 );
u += xratio;
}
v += yratio;
}
} else {
Convert8888to565( OpenGL.tmpBuf, Glide.SrcBuffer.Address, Glide.WindowTotalPixels );
}
}
Glide.SrcBuffer.Lock = true;
Glide.SrcBuffer.Type = dwType;
Glide.SrcBuffer.Buffer = dwBuffer;
Glide.SrcBuffer.WriteMode = dwWriteMode;
Glide.SrcBuffer.PixelPipeline = bPixelPipeline;
lfbInfo->lfbPtr = Glide.SrcBuffer.Address;
}
lfbInfo->writeMode = GR_LFBWRITEMODE_565;
lfbInfo->strideInBytes = Glide.WindowWidth * 2;
return FXTRUE;
}
//*************************************************
FX_ENTRY FxBool FX_CALL
grLfbUnlock( GrLock_t dwType, GrBuffer_t dwBuffer )
{
#ifdef OGL_CRITICAL
GlideMsg("grLfbUnlock( %d, %d )\n", dwType, dwBuffer );
#endif
if ( dwType & 1 )
{
if ( ! Glide.DstBuffer.Lock )
{
return FXFALSE;
}
FxU32 ii,
x,
y,
maxx = 0,
maxy = 0,
minx = Glide.WindowWidth,
miny = Glide.WindowHeight;
for ( ii = 0, x = 0, y = 0; ii < Glide.WindowTotalPixels; ii++ )
{
if ( Glide.DstBuffer.Address[ ii ] != BLUE_SCREEN )
{
if ( x > maxx ) maxx = x;
if ( y > maxy ) maxy = y;
if ( x < minx ) minx = x;
if ( y < miny ) miny = y;
OpenGL.tmpBuf[ ii ] = 0x0 | // A
( Glide.DstBuffer.Address[ ii ] & 0x001F ) << 19 | // B
( Glide.DstBuffer.Address[ ii ] & 0x07E0 ) << 5 | // G
( Glide.DstBuffer.Address[ ii ] >> 8 ); // R
Glide.DstBuffer.Address[ ii ] = BLUE_SCREEN;
} else
OpenGL.tmpBuf[ ii ] = 0xFFFFFFFF;
x++;
if ( x == Glide.WindowWidth )
{
x = 0;
y++;
}
}
if ( maxx >= minx )
{
maxx++; maxy++;
FxU32 ysize = maxy - miny;
// Draw a textured quad
glPushAttrib( GL_COLOR_BUFFER_BIT|GL_TEXTURE_BIT|GL_DEPTH_BUFFER_BIT );
glDisable( GL_BLEND );
glEnable( GL_TEXTURE_2D );
if ( Glide.DstBuffer.PixelPipeline )
glEnable( GL_SCISSOR_TEST );
glAlphaFunc( GL_EQUAL, 0.0f );
glEnable( GL_ALPHA_TEST );
glDepthMask( GL_FALSE );
glDisable( GL_DEPTH_TEST );
glBindTexture( GL_TEXTURE_2D, Glide.LFBTexture );
glTexSubImage2D( GL_TEXTURE_2D, 0, 0, 0, Glide.WindowWidth, ysize, GL_RGBA,
GL_UNSIGNED_BYTE, OpenGL.tmpBuf + ( miny * Glide.WindowWidth ) );
glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
glDrawBuffer( Glide.DstBuffer.Buffer == GR_BUFFER_BACKBUFFER
? GL_BACK : GL_FRONT );
glBegin( GL_QUADS );
glColor3f( 1.0f, 1.0f, 1.0f );
glTexCoord2f( (float)minx/Glide.LFBTextureSize, 0.0f );
glVertex2f( (float)minx, (float)miny );
glTexCoord2f((float)maxx/Glide.LFBTextureSize, 0.0f );
glVertex2f( (float)maxx, (float)miny );
glTexCoord2f( (float)maxx/Glide.LFBTextureSize, (float)ysize/Glide.LFBTextureSize );
glVertex2f( (float)maxx, (float)maxy );
glTexCoord2f( (float)minx/Glide.LFBTextureSize, (float)ysize/Glide.LFBTextureSize );
glVertex2f( (float)minx, (float)maxy );
glEnd( );
glPopAttrib( );
glDrawBuffer( OpenGL.RenderBuffer );
if ( Glide.DstBuffer.Buffer != GR_BUFFER_BACKBUFFER )
{
glFlush( );
}
}
Glide.DstBuffer.Lock = false;
return FXTRUE;
}
else
{
if ( Glide.SrcBuffer.Lock )
{
Glide.SrcBuffer.Lock = false;
return FXTRUE;
}
else
{
return FXFALSE;
}
}
}
//*************************************************
FX_ENTRY FxBool FX_CALL
grLfbReadRegion( GrBuffer_t src_buffer,
FxU32 src_x, FxU32 src_y,
FxU32 src_width, FxU32 src_height,
FxU32 dst_stride, void *dst_data )
{
#ifdef OGL_NOTDONE
GlideMsg("grLfbReadRegion( %d, %d, %d, %d, %d, %d, --- )\n",
src_buffer, src_x, src_y, src_width, src_height, dst_stride );
#endif
// Copied from the linux sst1 driver src
FxBool rv = FXTRUE;
GrLfbInfo_t info;
info.size = sizeof( info );
if ( grLfbLock( GR_LFB_READ_ONLY,
src_buffer,
GR_LFBWRITEMODE_ANY,
GR_ORIGIN_UPPER_LEFT,
FXFALSE,
&info ) )
{
FxU32 *srcData; /* Tracking Source Pointer */
FxU32 *dstData; /* Tracking Destination Pointer */
FxU32 *end; /* Demarks End of each Scanline */
FxU32 srcJump; /* bytes to next scanline */
FxU32 dstJump; /* bytes to next scanline */
FxU32 length; /* bytes to copy in scanline */
FxU32 scanline; /* scanline number */
int aligned; /* word aligned? */
dstData = ( FxU32 * ) dst_data;
srcData = ( FxU32 * ) ( ((char*)info.lfbPtr)+
(src_y*info.strideInBytes) +
(src_x<<1) );
scanline = src_height;
length = src_width * 2;
dstJump = dst_stride - length;
srcJump = info.strideInBytes - length;
aligned = !((FxU)srcData&0x2);
if ( aligned ) {
while( scanline-- ) {
end = (FxU32*)((char*)srcData + length - 2);
while( srcData < end )
*dstData++ = *srcData++;
if ( ((int)length) & 0x2 ) {
(*(FxU16*)dstData) = (*(FxU16*)srcData);
dstData = (FxU32*)(((FxU16*)dstData) + 1 );
srcData = (FxU32*)(((FxU16*)srcData) + 1 );
}
dstData = (FxU32*)(((char*)dstData)+dstJump);
srcData = (FxU32*)(((char*)srcData)+srcJump);
}
} else {
while( scanline-- ) {
end = (FxU32*)((char*)srcData + length - 2);
(*(FxU16*)dstData) = (*(FxU16*)srcData);
dstData = (FxU32*)(((FxU16*)dstData) + 1 );
srcData = (FxU32*)(((FxU16*)srcData) + 1 );
while( srcData < end )
*dstData++ = *srcData++;
if ( !(((int)length) & 0x2) ) {
(*(FxU16*)dstData) = (*(FxU16*)srcData);
dstData = (FxU32*)(((FxU16*)dstData) + 1 );
srcData = (FxU32*)(((FxU16*)srcData) + 1 );
}
dstData = (FxU32*)(((char*)dstData)+dstJump);
srcData = (FxU32*)(((char*)srcData)+srcJump);
}
}
grLfbUnlock( GR_LFB_READ_ONLY, src_buffer );
} else {
rv = FXFALSE;
}
return rv;
}
//*************************************************
FX_ENTRY FxBool FX_CALL
grLfbWriteRegion( GrBuffer_t dst_buffer,
FxU32 dst_x, FxU32 dst_y,
GrLfbSrcFmt_t src_format,
FxU32 src_width, FxU32 src_height,
FxI32 src_stride, void *src_data )
{
#ifdef OGL_NOTDONE
GlideMsg("grLfbWriteRegion( %d, %d, %d, %d, %d, %d, %d, --- )\n",
dst_buffer, dst_x, dst_y, src_format, src_width, src_height, src_stride );
#endif
// Copied from the linux sst1 driver src
FxBool rv = FXTRUE;
GrLfbInfo_t info;
GrLfbWriteMode_t writeMode;
if ( src_format == GR_LFB_SRC_FMT_RLE16 )
writeMode = GR_LFBWRITEMODE_565;
else
writeMode = (GrLfbWriteMode_t)src_format;
info.size = sizeof( info );
if ( grLfbLock((GrLock_t)( GR_LFB_WRITE_ONLY | GR_LFB_NOIDLE),
dst_buffer,
writeMode,
GR_ORIGIN_UPPER_LEFT,
FXFALSE,
&info ) )
{
FxU32 *srcData; /* Tracking Source Pointer */
FxU32 *dstData; /* Tracking Destination Pointer */
FxU32 *end; /* Demarks End of each Scanline */
FxI32 srcJump; /* bytes to next scanline */
FxU32 dstJump; /* bytes to next scanline */
FxU32 length; /* bytes to copy in scanline */
FxU32 scanline; /* scanline number */
int aligned; /* word aligned? */
srcData = ( FxU32 * ) src_data;
dstData = ( FxU32 * ) ( ((char*)info.lfbPtr)+
(dst_y*info.strideInBytes) );
scanline = src_height;
switch( src_format ) {
/* 16-bit aligned */
case GR_LFB_SRC_FMT_565:
case GR_LFB_SRC_FMT_555:
case GR_LFB_SRC_FMT_1555:
case GR_LFB_SRC_FMT_ZA16:
dstData = (FxU32*)(((FxU16*)dstData) + dst_x);
length = src_width * 2;
aligned = !((FxU)dstData&0x2);
srcJump = src_stride - length;
dstJump = info.strideInBytes - length;
if ( aligned )
{
while( scanline-- )
{
end = (FxU32*)((char*)srcData + length - 2);
while( srcData < end )
{
// TODO: swap on bigendian?
*dstData = *srcData;
dstData++;
srcData++;
}
if ( ((int)length) & 0x2 )
{
(*(FxU16*)&(dstData[0])) = (*(FxU16*)&(srcData[0]));
dstData = (FxU32*)(((FxU16*)dstData) + 1 );
srcData = (FxU32*)(((FxU16*)srcData) + 1 );
}
dstData = (FxU32*)(((char*)dstData)+dstJump);
srcData = (FxU32*)(((char*)srcData)+srcJump);
}
}
else
{
while( scanline-- ) {
end = (FxU32*)((char*)srcData + length - 2);
// TODO: swap on bigendian?
(*(FxU16*)&(dstData[0])) = (*(FxU16*)&(srcData[0]));
dstData = (FxU32*)(((FxU16*)dstData) + 1 );
srcData = (FxU32*)(((FxU16*)srcData) + 1 );
while( srcData < end ) {
// TODO: swap on bigendian?
*dstData = *srcData;
dstData++;
srcData++;
}
if ( !(length & 0x2) )
{
// TODO: swap on bigendian?
(*(FxU16*)&(dstData[0])) = (*(FxU16*)&(srcData[0]));
dstData = (FxU32*)(((FxU16*)dstData) + 1 );
srcData = (FxU32*)(((FxU16*)srcData) + 1 );
}
dstData = (FxU32*)(((char*)dstData)+dstJump);
srcData = (FxU32*)(((char*)srcData)+srcJump);
}
}
break;
/* 32-bit aligned */
case GR_LFB_SRC_FMT_888:
case GR_LFB_SRC_FMT_8888:
case GR_LFB_SRC_FMT_565_DEPTH:
case GR_LFB_SRC_FMT_555_DEPTH:
case GR_LFB_SRC_FMT_1555_DEPTH:
dstData = ((FxU32*)dstData) + dst_x;
length = src_width * 4;
srcJump = src_stride - length;
dstJump = info.strideInBytes - length;
while( scanline-- ) {
end = (FxU32*)((char*)srcData + length);
while( srcData < end ) {
// TODO: swap on bigendian?
*dstData = *srcData;
dstData++;
srcData++;
}
dstData = (FxU32*)(((char*)dstData)+dstJump);
srcData = (FxU32*)(((char*)srcData)+srcJump);
}
break;
case GR_LFB_SRC_FMT_RLE16:
// TODO: needs to be implemented
rv = FXFALSE;
break;
default:
rv = FXFALSE;
break;
}
grLfbUnlock( GR_LFB_WRITE_ONLY, dst_buffer );
} else {
rv = FXFALSE;
}
return rv;
}
FX_ENTRY void FX_CALL
grLfbConstantAlpha( GrAlpha_t alpha )
{
#ifdef OGL_CRITICAL
GlideMsg("grLfbConstantAlpha( %lu )\n", alpha );
#endif
}
FX_ENTRY void FX_CALL
grLfbConstantDepth( FxU16 depth )
{
#ifdef OGL_CRITICAL
GlideMsg("grLfbConstantDepth( %u )\n", depth );
#endif
}
FX_ENTRY void FX_CALL
grLfbWriteColorSwizzle( FxBool swizzleBytes, FxBool swapWords )
{
#ifdef OGL_CRITICAL
GlideMsg("grLfbWriteColorSwizzle( %d, %d )\n",
swizzleBytes, swapWords );
#endif
}
FX_ENTRY void FX_CALL
grLfbWriteColorFormat( GrColorFormat_t colorFormat )
{
#ifdef OGL_CRITICAL
GlideMsg("grLfbWriteColorFormat( %u )\n", colorFormat );
#endif
}