-/* $Id: s_zoom.c,v 1.20 2003/02/17 15:41:05 brianp Exp $ */
/*
* Mesa 3-D graphics library
/*
- * Helper function called from _mesa_write_zoomed_rgba/rgb/index_span().
+ * Helper function called from _swrast_write_zoomed_rgba/rgb/index_span().
*/
static void
zoom_span( GLcontext *ctx, const struct sw_span *span,
GLint c0, c1, skipCol;
GLint i, j;
const GLuint maxWidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
- GLchan rgbaSave[MAX_WIDTH][4];
- GLuint indexSave[MAX_WIDTH];
- const GLchan (*rgba)[4] = (const GLchan (*)[4]) src;
- const GLchan (*rgb)[3] = (const GLchan (*)[3]) src;
- const GLuint *indexes = (const GLuint *) src;
struct sw_span zoomed;
struct span_arrays zoomed_arrays; /* this is big! */
- /* no pixel arrays! */
+ /* no pixel arrays! must be horizontal spans. */
ASSERT((span->arrayMask & SPAN_XY) == 0);
ASSERT(span->primitive == GL_BITMAP);
INIT_SPAN(zoomed, GL_BITMAP, 0, 0, 0);
zoomed.array = &zoomed_arrays;
- zoomed.z = span->z;
- zoomed.zStep = span->zStep; /* span->zStep == 0 */
+ /* copy fog interp info */
zoomed.fog = span->fog;
zoomed.fogStep = span->fogStep;
+ /* XXX copy texcoord info? */
+
if (format == GL_RGBA || format == GL_RGB) {
+ /* copy Z info */
+ zoomed.z = span->z;
+ zoomed.zStep = span->zStep;
+ /* we'll generate an array of colorss */
zoomed.interpMask = span->interpMask & ~SPAN_RGBA;
zoomed.arrayMask |= SPAN_RGBA;
}
else if (format == GL_COLOR_INDEX) {
+ /* copy Z info */
+ zoomed.z = span->z;
+ zoomed.zStep = span->zStep;
+ /* we'll generate an array of color indexes */
zoomed.interpMask = span->interpMask & ~SPAN_INDEX;
zoomed.arrayMask |= SPAN_INDEX;
}
+ else {
+ assert(format == GL_DEPTH_COMPONENT);
+ /* Copy color info */
+ zoomed.red = span->red;
+ zoomed.green = span->green;
+ zoomed.blue = span->blue;
+ zoomed.alpha = span->alpha;
+ zoomed.redStep = span->redStep;
+ zoomed.greenStep = span->greenStep;
+ zoomed.blueStep = span->blueStep;
+ zoomed.alphaStep = span->alphaStep;
+ /* we'll generate an array of depth values */
+ zoomed.interpMask = span->interpMask & ~SPAN_Z;
+ zoomed.arrayMask |= SPAN_Z;
+ }
/*
* Compute which columns to draw: [c0, c1)
*/
-#if 0
- c0 = (GLint) span->x;
- c1 = (GLint) (span->x + span->end * ctx->Pixel.ZoomX);
-#else
- c0 = (GLint) span->x + skipPixels * ctx->Pixel.ZoomX;
+ c0 = (GLint) (span->x + skipPixels * ctx->Pixel.ZoomX);
c1 = (GLint) (span->x + (skipPixels + span->end) * ctx->Pixel.ZoomX);
-#endif
if (c0 == c1) {
return;
}
/* zoom the span horizontally */
if (format == GL_RGBA) {
+ const GLchan (*rgba)[4] = (const GLchan (*)[4]) src;
if (ctx->Pixel.ZoomX == -1.0F) {
/* common case */
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = span->end + i - 1;
}
ASSERT(i >= 0);
- ASSERT(i < span->end);
+ ASSERT(i < (GLint) span->end);
COPY_CHAN4(zoomed.array->rgba[j], rgba[i]);
}
}
}
else if (format == GL_RGB) {
+ const GLchan (*rgb)[3] = (const GLchan (*)[3]) src;
if (ctx->Pixel.ZoomX == -1.0F) {
/* common case */
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = span->end + i - 1;
}
ASSERT(i >= 0);
- ASSERT(i < span->end);
+ ASSERT(i < (GLint) span->end);
zoomed.array->rgba[j][0] = rgb[i][0];
zoomed.array->rgba[j][1] = rgb[i][1];
zoomed.array->rgba[j][2] = rgb[i][2];
}
}
else if (format == GL_COLOR_INDEX) {
+ const GLuint *indexes = (const GLuint *) src;
if (ctx->Pixel.ZoomX == -1.0F) {
/* common case */
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = span->end + i - 1;
}
ASSERT(i >= 0);
- ASSERT(i < span->end);
+ ASSERT(i < (GLint) span->end);
zoomed.array->index[j] = indexes[i];
}
}
}
+ else {
+ const GLdepth *zValues = (const GLuint *) src;
+ assert(format == GL_DEPTH_COMPONENT);
+ if (ctx->Pixel.ZoomX == -1.0F) {
+ /* common case */
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = span->end - (j + skipCol) - 1;
+ zoomed.array->z[j] = zValues[i];
+ }
+ }
+ else {
+ /* general solution */
+ const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+ for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+ i = (GLint) ((j + skipCol) * xscale);
+ if (ctx->Pixel.ZoomX < 0.0) {
+ ASSERT(i <= 0);
+ i = span->end + i - 1;
+ }
+ ASSERT(i >= 0);
+ ASSERT(i < (GLint) span->end);
+ zoomed.array->z[j] = zValues[i];
+ }
+ }
+ /* Now, fall into either the RGB or COLOR_INDEX path below */
+ if (ctx->Visual.rgbMode)
+ format = GL_RGBA;
+ else
+ format = GL_COLOR_INDEX;
+ }
+
/* write the span in rows [r0, r1) */
if (format == GL_RGBA || format == GL_RGB) {
/* Writing the span may modify the colors, so make a backup now if we're
- * going to call _mesa_write_zoomed_span() more than once.
+ * going to call _swrast_write_zoomed_span() more than once.
+ * Also, clipping may change the span end value, so store it as well.
*/
+ GLchan rgbaSave[MAX_WIDTH][4];
+ const GLint end = zoomed.end; /* save */
if (r1 - r0 > 1) {
MEMCPY(rgbaSave, zoomed.array->rgba, zoomed.end * 4 * sizeof(GLchan));
}
for (zoomed.y = r0; zoomed.y < r1; zoomed.y++) {
- _mesa_write_rgba_span(ctx, &zoomed);
+ _swrast_write_rgba_span(ctx, &zoomed);
+ zoomed.end = end; /* restore */
if (r1 - r0 > 1) {
/* restore the colors */
MEMCPY(zoomed.array->rgba, rgbaSave, zoomed.end*4 * sizeof(GLchan));
}
}
else if (format == GL_COLOR_INDEX) {
+ GLuint indexSave[MAX_WIDTH];
+ const GLint end = zoomed.end; /* save */
if (r1 - r0 > 1) {
MEMCPY(indexSave, zoomed.array->index, zoomed.end * sizeof(GLuint));
}
for (zoomed.y = r0; zoomed.y < r1; zoomed.y++) {
- _mesa_write_index_span(ctx, &zoomed);
+ _swrast_write_index_span(ctx, &zoomed);
+ zoomed.end = end; /* restore */
if (r1 - r0 > 1) {
/* restore the colors */
MEMCPY(zoomed.array->index, indexSave, zoomed.end * sizeof(GLuint));
void
-_mesa_write_zoomed_rgba_span( GLcontext *ctx, const struct sw_span *span,
+_swrast_write_zoomed_rgba_span( GLcontext *ctx, const struct sw_span *span,
CONST GLchan rgba[][4], GLint y0,
GLint skipPixels )
{
void
-_mesa_write_zoomed_rgb_span( GLcontext *ctx, const struct sw_span *span,
+_swrast_write_zoomed_rgb_span( GLcontext *ctx, const struct sw_span *span,
CONST GLchan rgb[][3], GLint y0,
GLint skipPixels )
{
void
-_mesa_write_zoomed_index_span( GLcontext *ctx, const struct sw_span *span,
+_swrast_write_zoomed_index_span( GLcontext *ctx, const struct sw_span *span,
GLint y0, GLint skipPixels )
{
- zoom_span(ctx, span, (const GLvoid *) span->array->index, y0,
- GL_COLOR_INDEX, skipPixels);
+ zoom_span(ctx, span, (const GLvoid *) span->array->index, y0,
+ GL_COLOR_INDEX, skipPixels);
+}
+
+
+void
+_swrast_write_zoomed_depth_span( GLcontext *ctx, const struct sw_span *span,
+ GLint y0, GLint skipPixels )
+{
+ zoom_span(ctx, span, (const GLvoid *) span->array->z, y0,
+ GL_DEPTH_COMPONENT, skipPixels);
}
* As above, but write stencil values.
*/
void
-_mesa_write_zoomed_stencil_span( GLcontext *ctx,
+_swrast_write_zoomed_stencil_span( GLcontext *ctx,
GLuint n, GLint x, GLint y,
const GLstencil stencil[], GLint y0,
GLint skipPixels )
(void) skipPixels; /* XXX this shouldn't be ignored */
/* compute width of output row */
- m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
+ m = (GLint) FABSF( n * ctx->Pixel.ZoomX );
if (m==0) {
return;
}
/* write the span */
for (r=r0; r<r1; r++) {
- _mesa_write_stencil_span( ctx, m, x+skipcol, r, zstencil );
+ _swrast_write_stencil_span( ctx, m, x+skipcol, r, zstencil );
}
}
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