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basic support for reading GL_DEPTH_COMPONENT

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This commit is contained in:
Brian
2007-10-03 13:45:24 -06:00
parent e6f4af6b23
commit a9f0330061
1 changed files with 34 additions and 3 deletions
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37
src/mesa/state_tracker/st_cb_readpixels.c
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@@ -86,7 +86,12 @@ st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
}
strb = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
if (format == GL_DEPTH_COMPONENT) {
strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
}
else {
strb = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
}
if (!strb)
return;
@@ -98,6 +103,14 @@ st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
height, format, type, 0, 0);
dfStride = width * 4;
}
#if 0
else if (format == GL_DEPTH_COMPONENT && type == GL_FLOAT) {
/* write tile(row) directly into user's buffer */
df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width,
height, format, type, 0, 0);
dfStride = width;
}
#endif
else {
/* write tile(row) into temp row buffer */
df = (GLfloat *) temp;
@@ -122,8 +135,26 @@ st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
/* convert GLfloat to user's format/type */
GLvoid *dst = _mesa_image_address2d(&clippedPacking, dest, width,
height, format, type, i, 0);
_mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,
&clippedPacking, transferOps);
if (format == GL_DEPTH_COMPONENT) {
float z[MAX_WIDTH];
if (strb->surface->format == PIPE_FORMAT_S8_Z24) {
const double scale = 1.0 / ((1 << 24) - 1);
const uint *zs = (const uint *) temp;
uint k;
for (k = 0; k < width; k++) {
z[k] = (zs[k] & 0xffffff) * scale;
}
}
else {
assert(0);
}
_mesa_pack_depth_span(ctx, width, dst, type,
z, &clippedPacking);
}
else {
_mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,
&clippedPacking, transferOps);
}
}
}