src/mesa/main/marshal.c

   1 /*
   2  * Copyright © 2012 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /** \file marshal.c
  25  *
  26  * Custom functions for marshalling GL calls from the main thread to a worker
  27  * thread when automatic code generation isn't appropriate.
  28  */
  29
  30 #include "main/enums.h"
  31 #include "main/macros.h"
  32 #include "marshal.h"
  33 #include "dispatch.h"
  34
  35 struct marshal_cmd_ShaderSource
  36 {
  37    struct marshal_cmd_base cmd_base;
  38    GLuint shader;
  39    GLsizei count;
  40    /* Followed by GLint length[count], then the contents of all strings,
  41     * concatenated.
  42     */
  43 };
  44
  45
  46 void
  47 _mesa_unmarshal_ShaderSource(struct gl_context *ctx,
  48                              const struct marshal_cmd_ShaderSource *cmd)
  49 {
  50    const GLint *cmd_length = (const GLint *) (cmd + 1);
  51    const GLchar *cmd_strings = (const GLchar *) (cmd_length + cmd->count);
  52    /* TODO: how to deal with malloc failure? */
  53    const GLchar * *string = malloc(cmd->count * sizeof(const GLchar *));
  54    int i;
  55
  56    for (i = 0; i < cmd->count; ++i) {
  57       string[i] = cmd_strings;
  58       cmd_strings += cmd_length[i];
  59    }
  60    CALL_ShaderSource(ctx->CurrentServerDispatch,
  61                      (cmd->shader, cmd->count, string, cmd_length));
  62    free((void *)string);
  63 }
  64
  65
  66 static size_t
  67 measure_ShaderSource_strings(GLsizei count, const GLchar * const *string,
  68                              const GLint *length_in, GLint *length_out)
  69 {
  70    int i;
  71    size_t total_string_length = 0;
  72
  73    for (i = 0; i < count; ++i) {
  74       if (length_in == NULL || length_in[i] < 0) {
  75          if (string[i])
  76             length_out[i] = strlen(string[i]);
  77       } else {
  78          length_out[i] = length_in[i];
  79       }
  80       total_string_length += length_out[i];
  81    }
  82    return total_string_length;
  83 }
  84
  85
  86 void GLAPIENTRY
  87 _mesa_marshal_ShaderSource(GLuint shader, GLsizei count,
  88                            const GLchar * const *string, const GLint *length)
  89 {
  90    /* TODO: how to report an error if count < 0? */
  91
  92    GET_CURRENT_CONTEXT(ctx);
  93    /* TODO: how to deal with malloc failure? */
  94    const size_t fixed_cmd_size = sizeof(struct marshal_cmd_ShaderSource);
  95    STATIC_ASSERT(sizeof(struct marshal_cmd_ShaderSource) % sizeof(GLint) == 0);
  96    size_t length_size = count * sizeof(GLint);
  97    GLint *length_tmp = malloc(length_size);
  98    size_t total_string_length =
  99       measure_ShaderSource_strings(count, string, length, length_tmp);
 100    size_t total_cmd_size = fixed_cmd_size + length_size + total_string_length;
 101
 102    if (total_cmd_size <= MARSHAL_MAX_CMD_SIZE && count > 0) {
 103       struct marshal_cmd_ShaderSource *cmd =
 104          _mesa_glthread_allocate_command(ctx, DISPATCH_CMD_ShaderSource,
 105                                          total_cmd_size);
 106       GLint *cmd_length = (GLint *) (cmd + 1);
 107       GLchar *cmd_strings = (GLchar *) (cmd_length + count);
 108       int i;
 109
 110       cmd->shader = shader;
 111       cmd->count = count;
 112       memcpy(cmd_length, length_tmp, length_size);
 113       for (i = 0; i < count; ++i) {
 114          memcpy(cmd_strings, string[i], cmd_length[i]);
 115          cmd_strings += cmd_length[i];
 116       }
 117    } else {
 118       _mesa_glthread_finish(ctx);
 119       CALL_ShaderSource(ctx->CurrentServerDispatch,
 120                         (shader, count, string, length_tmp));
 121    }
 122    free(length_tmp);
 123 }