/**
* Read pixels for format=GL_STENCIL_INDEX.
*/
static void
read_stencil_pixels( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, GLvoid *pixels,
const struct gl_pixelstore_attrib *packing )
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
GLint j;
GLubyte *map, *stencil;
GLint stride;
if (!rb)
return;
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
stencil = malloc(width * sizeof(GLubyte));
if (stencil) {
/* process image row by row */
for (j = 0; j < height; j++) {
GLvoid *dest;
_mesa_unpack_ubyte_stencil_row(rb->Format, width, map, stencil);
dest = _mesa_image_address2d(packing, pixels, width, height,
GL_STENCIL_INDEX, type, j, 0);
_mesa_pack_stencil_span(ctx, width, type, dest, stencil, packing);
map += stride;
}
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
}
free(stencil);
ctx->Driver.UnmapRenderbuffer(ctx, rb);
}
/**
* Read pixels for format=GL_STENCIL_INDEX.
*/
static void
read_stencil_pixels( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, GLvoid *pixels,
const struct gl_pixelstore_attrib *packing )
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
GLint j;
GLubyte *map;
GLint stride;
if (!rb)
return;
/* width should never be > MAX_WIDTH since we did clipping earlier */
ASSERT(width <= MAX_WIDTH);
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
return;
}
/* process image row by row */
for (j = 0; j < height; j++) {
GLvoid *dest;
GLubyte stencil[MAX_WIDTH];
_mesa_unpack_ubyte_stencil_row(rb->Format, width, map, stencil);
dest = _mesa_image_address2d(packing, pixels, width, height,
GL_STENCIL_INDEX, type, j, 0);
_mesa_pack_stencil_span(ctx, width, type, dest, stencil, packing);
map += stride;
}
ctx->Driver.UnmapRenderbuffer(ctx, rb);
}
