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new read_R5G5B5_span() function

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This commit is contained in:
Brian Paul
2000-04-07 00:29:01 +00:00
parent 0771d159d5
commit 15724afd62
1 changed files with 58 additions and 1 deletions
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src/mesa/drivers/glide/fxddspan.c
+58 -1
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@@ -332,6 +332,7 @@ static void fxDDReadRGBASpan(const GLcontext *ctx,
GLuint i;
GLint bottom=fxMesa->height+fxMesa->y_offset-1;
printf("read span %d, %d, %d\n", x,y,n);
if (MESA_VERBOSE&VERBOSE_DRIVER) {
fprintf(stderr,"fxmesa: fxDDReadRGBASpan(...)\n");
}
@@ -350,6 +351,61 @@ static void fxDDReadRGBASpan(const GLcontext *ctx,
}
}
/*
* Read a span of 16-bit RGB pixels. Note, we don't worry about cliprects
* since OpenGL says obscured pixels have undefined values.
*/
static void read_R5G6B5_span(const GLcontext *ctx,
GLuint n, GLint x, GLint y, GLubyte rgba[][4])
{
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
GrLfbInfo_t info;
BEGIN_BOARD_LOCK();
if (grLfbLock(GR_LFB_READ_ONLY,
fxMesa->currentFB,
GR_LFBWRITEMODE_ANY,
GR_ORIGIN_UPPER_LEFT,
FXFALSE,
&info)) {
const GLint winX = fxMesa->x_offset;
const GLint winY = fxMesa->y_offset + fxMesa->height - 1;
const GLint dstStride = (fxMesa->glCtx->Color.DrawBuffer == GL_FRONT)
? (fxMesa->screen_width) : (info.strideInBytes / 2);
const GLushort *data16 = (const GLushort *) info.lfbPtr
+ (winY - y) * dstStride
+ (winX + x);
const GLuint *data32 = (const GLuint *) data16;
GLuint i, j;
GLuint extraPixel = (n & 1);
n -= extraPixel;
for (i = j = 0; i < n; i += 2, j++) {
GLuint pixel = data32[j];
GLuint pixel0 = pixel & 0xffff;
GLuint pixel1 = pixel >> 16;
rgba[i][RCOMP] = FX_PixelToR[pixel0];
rgba[i][GCOMP] = FX_PixelToG[pixel0];
rgba[i][BCOMP] = FX_PixelToB[pixel0];
rgba[i][ACOMP] = 255;
rgba[i+1][RCOMP] = FX_PixelToR[pixel1];
rgba[i+1][GCOMP] = FX_PixelToG[pixel1];
rgba[i+1][BCOMP] = FX_PixelToB[pixel1];
rgba[i+1][ACOMP] = 255;
}
if (extraPixel) {
GLushort pixel = data16[n];
rgba[n][RCOMP] = FX_PixelToR[pixel];
rgba[n][GCOMP] = FX_PixelToG[pixel];
rgba[n][BCOMP] = FX_PixelToB[pixel];
rgba[n][ACOMP] = 255;
}
grLfbUnlock(GR_LFB_READ_ONLY, fxMesa->currentFB);
}
END_BOARD_LOCK();
}
/************************************************************************/
/***** Pixel functions *****/
/************************************************************************/
@@ -539,7 +595,8 @@ void fxSetupDDSpanPointers(GLcontext *ctx)
ctx->Driver.WriteCI32Pixels =NULL;
ctx->Driver.WriteMonoCIPixels =NULL;
ctx->Driver.ReadRGBASpan =fxDDReadRGBASpan;
/* ctx->Driver.ReadRGBASpan =fxDDReadRGBASpan;*/
ctx->Driver.ReadRGBASpan = read_R5G6B5_span;
ctx->Driver.ReadRGBAPixels =fxDDReadRGBAPixels;
ctx->Driver.ReadCI32Span =NULL;