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-rw-r--r--glx/indirect_util.c310
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+/*
+ * (C) Copyright IBM Corporation 2005
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * IBM,
+ * AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <string.h>
+
+#include <X11/Xmd.h>
+#include <GL/gl.h>
+#include <GL/glxproto.h>
+#include <inttypes.h>
+#include "indirect_size.h"
+#include "indirect_size_get.h"
+#include "indirect_dispatch.h"
+#include "glxserver.h"
+#include "glxbyteorder.h"
+#include "singlesize.h"
+#include "glapitable.h"
+#include "glapi.h"
+#include "glthread.h"
+#include "dispatch.h"
+#include "glxext.h"
+#include "indirect_table.h"
+#include "indirect_util.h"
+
+
+#define __GLX_PAD(a) (((a)+3)&~3)
+
+extern xGLXSingleReply __glXReply;
+
+
+GLint
+__glGetBooleanv_variable_size( GLenum e )
+{
+ if ( e == GL_COMPRESSED_TEXTURE_FORMATS ) {
+ GLint temp;
+
+ CALL_GetIntegerv( GET_DISPATCH(),
+ (GL_NUM_COMPRESSED_TEXTURE_FORMATS, & temp) );
+ return temp;
+ }
+ else {
+ return 0;
+ }
+}
+
+
+/**
+ * Get a properly aligned buffer to hold reply data.
+ *
+ * \warning
+ * This function assumes that \c local_buffer is already properly aligned.
+ * It also assumes that \c alignment is a power of two.
+ */
+void *
+__glXGetAnswerBuffer( __GLXclientState * cl, size_t required_size,
+ void * local_buffer, size_t local_size, unsigned alignment )
+{
+ void * buffer = local_buffer;
+ const unsigned mask = alignment - 1;
+
+ if ( local_size < required_size ) {
+ const size_t worst_case_size = required_size + alignment;
+ intptr_t temp_buf;
+
+ if ( cl->returnBufSize < worst_case_size ) {
+ void * temp = xrealloc( cl->returnBuf, worst_case_size );
+
+ if ( temp == NULL ) {
+ return NULL;
+ }
+
+ cl->returnBuf = temp;
+ cl->returnBufSize = worst_case_size;
+ }
+
+ temp_buf = (intptr_t) cl->returnBuf;
+ temp_buf = (temp_buf + mask) & ~mask;
+ buffer = (void *) temp_buf;
+ }
+
+ return buffer;
+}
+
+
+/**
+ * Send a GLX reply to the client.
+ *
+ * Technically speaking, there are several different ways to encode a GLX
+ * reply. The primary difference is whether or not certain fields (e.g.,
+ * retval, size, and "pad3") are set. This function gets around that by
+ * always setting all of the fields to "reasonable" values. This does no
+ * harm to clients, but it does make the server-side code much more compact.
+ */
+void
+__glXSendReply( ClientPtr client, const void * data, size_t elements,
+ size_t element_size, GLboolean always_array, CARD32 retval )
+{
+ size_t reply_ints = 0;
+
+ if ( __glXErrorOccured() ) {
+ elements = 0;
+ }
+ else if ( (elements > 1) || always_array ) {
+ reply_ints = ((elements * element_size) + 3) >> 2;
+ }
+
+ __glXReply.length = reply_ints;
+ __glXReply.type = X_Reply;
+ __glXReply.sequenceNumber = client->sequence;
+ __glXReply.size = elements;
+ __glXReply.retval = retval;
+
+
+ /* It is faster on almost always every architecture to just copy the 8
+ * bytes, even when not necessary, than check to see of the value of
+ * elements requires it. Copying the data when not needed will do no
+ * harm.
+ */
+
+ (void) memcpy( & __glXReply.pad3, data, 8 );
+ WriteToClient( client, sz_xGLXSingleReply, (char *) & __glXReply );
+
+ if ( reply_ints != 0 ) {
+ WriteToClient( client, reply_ints * 4, (char *) data );
+ }
+}
+
+
+/**
+ * Send a GLX reply to the client.
+ *
+ * Technically speaking, there are several different ways to encode a GLX
+ * reply. The primary difference is whether or not certain fields (e.g.,
+ * retval, size, and "pad3") are set. This function gets around that by
+ * always setting all of the fields to "reasonable" values. This does no
+ * harm to clients, but it does make the server-side code much more compact.
+ *
+ * \warning
+ * This function assumes that values stored in \c data will be byte-swapped
+ * by the caller if necessary.
+ */
+void
+__glXSendReplySwap( ClientPtr client, const void * data, size_t elements,
+ size_t element_size, GLboolean always_array, CARD32 retval )
+{
+ size_t reply_ints = 0;
+
+ if ( __glXErrorOccured() ) {
+ elements = 0;
+ }
+ else if ( (elements > 1) || always_array ) {
+ reply_ints = ((elements * element_size) + 3) >> 2;
+ }
+
+ __glXReply.length = bswap_32( reply_ints );
+ __glXReply.type = X_Reply;
+ __glXReply.sequenceNumber = bswap_16( client->sequence );
+ __glXReply.size = bswap_32( elements );
+ __glXReply.retval = bswap_32( retval );
+
+
+ /* It is faster on almost always every architecture to just copy the 8
+ * bytes, even when not necessary, than check to see of the value of
+ * elements requires it. Copying the data when not needed will do no
+ * harm.
+ */
+
+ (void) memcpy( & __glXReply.pad3, data, 8 );
+ WriteToClient( client, sz_xGLXSingleReply, (char *) & __glXReply );
+
+ if ( reply_ints != 0 ) {
+ WriteToClient( client, reply_ints * 4, (char *) data );
+ }
+}
+
+
+static int
+get_decode_index(const struct __glXDispatchInfo *dispatch_info,
+ unsigned opcode)
+{
+ int remaining_bits;
+ int next_remain;
+ const int_fast16_t * const tree = dispatch_info->dispatch_tree;
+ int_fast16_t index;
+
+
+ remaining_bits = dispatch_info->bits;
+ if (opcode >= (1U << remaining_bits)) {
+ return -1;
+ }
+
+ index = 0;
+ for (/* empty */; remaining_bits > 0; remaining_bits = next_remain) {
+ unsigned mask;
+ unsigned child_index;
+
+
+ /* Calculate the slice of bits used by this node.
+ *
+ * If remaining_bits = 8 and tree[index] = 3, the mask of just the
+ * remaining bits is 0x00ff and the mask for the remaining bits after
+ * this node is 0x001f. By taking 0x00ff & ~0x001f, we get 0x00e0.
+ * This masks the 3 bits that we would want for this node.
+ */
+
+ next_remain = remaining_bits - tree[index];
+ mask = ((1 << remaining_bits) - 1) &
+ ~((1 << next_remain) - 1);
+
+
+ /* Using the mask, calculate the index of the opcode in the node.
+ * With that index, fetch the index of the next node.
+ */
+
+ child_index = (opcode & mask) >> next_remain;
+ index = tree[index + 1 + child_index];
+
+
+ /* If the next node is an empty leaf, the opcode is for a non-existant
+ * function. We're done.
+ *
+ * If the next node is a non-empty leaf, look up the function pointer
+ * and return it.
+ */
+
+ if (index == EMPTY_LEAF) {
+ return -1;
+ }
+ else if (IS_LEAF_INDEX(index)) {
+ unsigned func_index;
+
+
+ /* The value stored in the tree for a leaf node is the base of
+ * the function pointers for that leaf node. The offset for the
+ * function for a particular opcode is the remaining bits in the
+ * opcode.
+ */
+
+ func_index = -index;
+ func_index += opcode & ((1 << next_remain) - 1);
+ return func_index;
+ }
+ }
+
+ /* We should *never* get here!!!
+ */
+ return -1;
+}
+
+
+void *
+__glXGetProtocolDecodeFunction(const struct __glXDispatchInfo *dispatch_info,
+ int opcode, int swapped_version)
+{
+ const int func_index = get_decode_index(dispatch_info, opcode);
+
+ return (func_index < 0)
+ ? NULL
+ : (void *) dispatch_info->dispatch_functions[func_index][swapped_version];
+}
+
+
+int
+__glXGetProtocolSizeData(const struct __glXDispatchInfo *dispatch_info,
+ int opcode, __GLXrenderSizeData *data)
+{
+ if (dispatch_info->size_table != NULL) {
+ const int func_index = get_decode_index(dispatch_info, opcode);
+
+ if ((func_index >= 0)
+ && (dispatch_info->size_table[func_index][0] != 0)) {
+ const int var_offset =
+ dispatch_info->size_table[func_index][1];
+
+ data->bytes = dispatch_info->size_table[func_index][0];
+ data->varsize = (var_offset != ~0)
+ ? dispatch_info->size_func_table[var_offset]
+ : NULL;
+
+ return 0;
+ }
+ }
+
+ return -1;
+}
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