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authorBrian Paul <brian.paul@tungstengraphics.com>2000-04-07 00:29:01 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2000-04-07 00:29:01 +0000
commit15724afd62a1466d616ac6ca4d292c46c6f86648 (patch)
tree45bda323ee2835407037cad81023ad3b5a193b0d /src/mesa/drivers
parent0771d159d59a856135e375ba89f6af2a057d4f5b (diff)
new read_R5G5B5_span() function
Diffstat (limited to 'src/mesa/drivers')
-rw-r--r--src/mesa/drivers/glide/fxddspan.c59
1 files changed, 58 insertions, 1 deletions
diff --git a/src/mesa/drivers/glide/fxddspan.c b/src/mesa/drivers/glide/fxddspan.c
index 89abdda951..8939b1eea6 100644
--- a/src/mesa/drivers/glide/fxddspan.c
+++ b/src/mesa/drivers/glide/fxddspan.c
@@ -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;