294 lines
8.9 KiB
C
294 lines
8.9 KiB
C
/*
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* (C) Copyright IBM Corporation 2005
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* IBM,
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* AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <string.h>
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#include <X11/Xmd.h>
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#include <GL/gl.h>
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#include <GL/glxproto.h>
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#include <inttypes.h>
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#include "indirect_size.h"
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#include "indirect_size_get.h"
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#include "indirect_dispatch.h"
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#include "glxserver.h"
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#include "glxbyteorder.h"
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#include "singlesize.h"
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#include "glxext.h"
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#include "indirect_table.h"
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#include "indirect_util.h"
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#define __GLX_PAD(a) (((a)+3)&~3)
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GLint
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__glGetBooleanv_variable_size(GLenum e)
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{
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if (e == GL_COMPRESSED_TEXTURE_FORMATS) {
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GLint temp;
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glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS, &temp);
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return temp;
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}
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else {
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return 0;
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}
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}
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/**
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* Get a properly aligned buffer to hold reply data.
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*
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* \warning
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* This function assumes that \c local_buffer is already properly aligned.
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* It also assumes that \c alignment is a power of two.
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*/
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void *
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__glXGetAnswerBuffer(__GLXclientState * cl, size_t required_size,
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void *local_buffer, size_t local_size, unsigned alignment)
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{
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void *buffer = local_buffer;
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const intptr_t mask = alignment - 1;
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if (local_size < required_size) {
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size_t worst_case_size;
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intptr_t temp_buf;
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if (required_size < SIZE_MAX - alignment)
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worst_case_size = required_size + alignment;
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else
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return NULL;
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if (cl->returnBufSize < worst_case_size) {
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void *temp = realloc(cl->returnBuf, worst_case_size);
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if (temp == NULL) {
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return NULL;
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}
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cl->returnBuf = temp;
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cl->returnBufSize = worst_case_size;
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}
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temp_buf = (intptr_t) cl->returnBuf;
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temp_buf = (temp_buf + mask) & ~mask;
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buffer = (void *) temp_buf;
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}
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return buffer;
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}
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/**
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* Send a GLX reply to the client.
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*
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* Technically speaking, there are several different ways to encode a GLX
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* reply. The primary difference is whether or not certain fields (e.g.,
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* retval, size, and "pad3") are set. This function gets around that by
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* always setting all of the fields to "reasonable" values. This does no
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* harm to clients, but it does make the server-side code much more compact.
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*/
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void
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__glXSendReply(ClientPtr client, const void *data, size_t elements,
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size_t element_size, GLboolean always_array, CARD32 retval)
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{
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size_t reply_ints = 0;
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xGLXSingleReply reply = { 0, };
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if (__glXErrorOccured()) {
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elements = 0;
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}
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else if ((elements > 1) || always_array) {
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reply_ints = bytes_to_int32(elements * element_size);
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}
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reply.length = reply_ints;
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reply.type = X_Reply;
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reply.sequenceNumber = client->sequence;
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reply.size = elements;
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reply.retval = retval;
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/* It is faster on almost always every architecture to just copy the 8
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* bytes, even when not necessary, than check to see of the value of
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* elements requires it. Copying the data when not needed will do no
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* harm.
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*/
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(void) memcpy(&reply.pad3, data, 8);
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WriteToClient(client, sz_xGLXSingleReply, &reply);
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if (reply_ints != 0) {
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WriteToClient(client, reply_ints * 4, data);
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}
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}
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/**
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* Send a GLX reply to the client.
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*
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* Technically speaking, there are several different ways to encode a GLX
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* reply. The primary difference is whether or not certain fields (e.g.,
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* retval, size, and "pad3") are set. This function gets around that by
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* always setting all of the fields to "reasonable" values. This does no
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* harm to clients, but it does make the server-side code much more compact.
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*
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* \warning
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* This function assumes that values stored in \c data will be byte-swapped
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* by the caller if necessary.
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*/
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void
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__glXSendReplySwap(ClientPtr client, const void *data, size_t elements,
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size_t element_size, GLboolean always_array, CARD32 retval)
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{
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size_t reply_ints = 0;
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xGLXSingleReply reply = { 0, };
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if (__glXErrorOccured()) {
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elements = 0;
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}
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else if ((elements > 1) || always_array) {
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reply_ints = bytes_to_int32(elements * element_size);
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}
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reply.length = bswap_32(reply_ints);
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reply.type = X_Reply;
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reply.sequenceNumber = bswap_16(client->sequence);
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reply.size = bswap_32(elements);
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reply.retval = bswap_32(retval);
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/* It is faster on almost always every architecture to just copy the 8
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* bytes, even when not necessary, than check to see of the value of
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* elements requires it. Copying the data when not needed will do no
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* harm.
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*/
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(void) memcpy(&reply.pad3, data, 8);
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WriteToClient(client, sz_xGLXSingleReply, &reply);
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if (reply_ints != 0) {
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WriteToClient(client, reply_ints * 4, data);
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}
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}
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static int
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get_decode_index(const struct __glXDispatchInfo *dispatch_info, unsigned opcode)
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{
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int remaining_bits;
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int next_remain;
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const int_fast16_t *const tree = dispatch_info->dispatch_tree;
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int_fast16_t index;
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remaining_bits = dispatch_info->bits;
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if (opcode >= (1U << remaining_bits)) {
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return -1;
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}
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index = 0;
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for ( /* empty */ ; remaining_bits > 0; remaining_bits = next_remain) {
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unsigned mask;
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unsigned child_index;
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/* Calculate the slice of bits used by this node.
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*
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* If remaining_bits = 8 and tree[index] = 3, the mask of just the
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* remaining bits is 0x00ff and the mask for the remaining bits after
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* this node is 0x001f. By taking 0x00ff & ~0x001f, we get 0x00e0.
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* This masks the 3 bits that we would want for this node.
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*/
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next_remain = remaining_bits - tree[index];
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mask = ((1 << remaining_bits) - 1) & ~((1 << next_remain) - 1);
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/* Using the mask, calculate the index of the opcode in the node.
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* With that index, fetch the index of the next node.
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*/
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child_index = (opcode & mask) >> next_remain;
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index = tree[index + 1 + child_index];
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/* If the next node is an empty leaf, the opcode is for a non-existent
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* function. We're done.
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*
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* If the next node is a non-empty leaf, look up the function pointer
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* and return it.
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*/
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if (index == EMPTY_LEAF) {
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return -1;
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}
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else if (IS_LEAF_INDEX(index)) {
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unsigned func_index;
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/* The value stored in the tree for a leaf node is the base of
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* the function pointers for that leaf node. The offset for the
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* function for a particular opcode is the remaining bits in the
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* opcode.
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*/
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func_index = -index;
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func_index += opcode & ((1 << next_remain) - 1);
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return func_index;
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}
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}
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/* We should *never* get here!!!
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*/
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return -1;
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}
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void *
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__glXGetProtocolDecodeFunction(const struct __glXDispatchInfo *dispatch_info,
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int opcode, int swapped_version)
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{
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const int func_index = get_decode_index(dispatch_info, opcode);
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return (func_index < 0)
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? NULL
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: (void *) dispatch_info->
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dispatch_functions[func_index][swapped_version];
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}
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int
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__glXGetProtocolSizeData(const struct __glXDispatchInfo *dispatch_info,
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int opcode, __GLXrenderSizeData * data)
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{
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if (dispatch_info->size_table != NULL) {
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const int func_index = get_decode_index(dispatch_info, opcode);
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if ((func_index >= 0)
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&& (dispatch_info->size_table[func_index][0] != 0)) {
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const int var_offset = dispatch_info->size_table[func_index][1];
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data->bytes = dispatch_info->size_table[func_index][0];
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data->varsize = (var_offset != ~0)
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? dispatch_info->size_func_table[var_offset]
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: NULL;
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return 0;
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}
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}
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return -1;
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}
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