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authorBrian <brian.paul@tungstengraphics.com>2007-10-13 12:29:11 -0600
committerBrian <brian.paul@tungstengraphics.com>2007-10-13 12:29:11 -0600
commit69466c60a5286328d140a5100580c90e9bf62327 (patch)
tree00aafd80c3ccebfdf78f95a5feabc81d6037f57a /src
parentfa1d442879f1279cf510a52a1002367b904d35ad (diff)
GL_STENCIL_INDEX support
Diffstat (limited to 'src')
-rw-r--r--src/mesa/state_tracker/st_cb_readpixels.c78
1 files changed, 77 insertions, 1 deletions
diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c
index 35cf64bae2..3fcce2463c 100644
--- a/src/mesa/state_tracker/st_cb_readpixels.c
+++ b/src/mesa/state_tracker/st_cb_readpixels.c
@@ -47,6 +47,78 @@
/**
+ * Special case for reading stencil buffer.
+ * For color/depth we use get_tile(). For stencil, map the stencil buffer.
+ */
+static void
+read_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height, GLenum type,
+ const struct gl_pixelstore_attrib *packing,
+ GLvoid *pixels)
+{
+ struct st_context *st = ctx->st;
+ struct pipe_context *pipe = st->pipe;
+ struct gl_framebuffer *fb = ctx->ReadBuffer;
+ struct st_renderbuffer *strb = st_renderbuffer(fb->_StencilBuffer);
+ struct pipe_surface *ps = strb->surface;
+ ubyte *stmap;
+ GLint j;
+
+ /* map the stencil buffer */
+ stmap = pipe->region_map(pipe, ps->region);
+
+ /* width should never be > MAX_WIDTH since we did clipping earlier */
+ ASSERT(width <= MAX_WIDTH);
+
+ /* process image row by row */
+ for (j = 0; j < height; j++, y++) {
+ GLvoid *dest;
+ GLstencil values[MAX_WIDTH];
+ GLint srcY;
+
+ if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
+ srcY = ctx->DrawBuffer->Height - y - 1;
+ }
+ else {
+ srcY = y;
+ }
+
+ /* get stencil values */
+ switch (ps->format) {
+ case PIPE_FORMAT_U_S8:
+ {
+ const ubyte *src = stmap + y * ps->region->pitch + x;
+ memcpy(values, src, width);
+ }
+ break;
+ case PIPE_FORMAT_S8_Z24:
+ {
+ const uint *src = (const uint *) stmap + y * ps->region->pitch + x;
+ GLint k;
+ for (k = 0; k < width; k++) {
+ values[k] = src[k] >> 24;
+ }
+ }
+ break;
+ default:
+ assert(0);
+ }
+
+ /* store */
+ dest = _mesa_image_address2d(packing, pixels, width, height,
+ GL_STENCIL_INDEX, type, j, 0);
+
+ _mesa_pack_stencil_span(ctx, width, type, dest, values, packing);
+ }
+
+
+ /* unmap the stencil buffer */
+ pipe->region_unmap(pipe, ps->region);
+}
+
+
+
+/**
* Do glReadPixels by getting rows from the framebuffer surface with
* get_tile(). Convert to requested format/type with Mesa image routines.
* Image transfer ops are done in software too.
@@ -86,7 +158,11 @@ st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
}
- if (format == GL_DEPTH_COMPONENT) {
+ if (format == GL_STENCIL_INDEX) {
+ read_stencil_pixels(ctx, x, y, width, height, type, pack, dest);
+ return;
+ }
+ else if (format == GL_DEPTH_COMPONENT) {
strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
}
else {