src/mesa/main/getstring.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26
  27 #include "glheader.h"
  28 #include "context.h"
  29 #include "get.h"
  30 #include "version.h"
  31 #include "enums.h"
  32 #include "extensions.h"
  33
  34
  35 /**
  36  * Examine enabled GL extensions to determine GL version.
  37  * \return version string
  38  */
  39 static const char *
  40 compute_version(const GLcontext *ctx)
  41 {
  42    static const char *version_1_2 = "1.2 Mesa " MESA_VERSION_STRING;
  43    static const char *version_1_3 = "1.3 Mesa " MESA_VERSION_STRING;
  44    static const char *version_1_4 = "1.4 Mesa " MESA_VERSION_STRING;
  45    static const char *version_1_5 = "1.5 Mesa " MESA_VERSION_STRING;
  46    static const char *version_2_0 = "2.0 Mesa " MESA_VERSION_STRING;
  47    static const char *version_2_1 = "2.1 Mesa " MESA_VERSION_STRING;
  48
  49    const GLboolean ver_1_3 = (ctx->Extensions.ARB_multisample &&
  50                               ctx->Extensions.ARB_multitexture &&
  51                               ctx->Extensions.ARB_texture_border_clamp &&
  52                               ctx->Extensions.ARB_texture_compression &&
  53                               ctx->Extensions.ARB_texture_cube_map &&
  54                               ctx->Extensions.EXT_texture_env_add &&
  55                               ctx->Extensions.ARB_texture_env_combine &&
  56                               ctx->Extensions.ARB_texture_env_dot3);
  57    const GLboolean ver_1_4 = (ver_1_3 &&
  58                               ctx->Extensions.ARB_depth_texture &&
  59                               ctx->Extensions.ARB_shadow &&
  60                               ctx->Extensions.ARB_texture_env_crossbar &&
  61                               ctx->Extensions.ARB_texture_mirrored_repeat &&
  62                               ctx->Extensions.ARB_window_pos &&
  63                               ctx->Extensions.EXT_blend_color &&
  64                               ctx->Extensions.EXT_blend_func_separate &&
  65                               ctx->Extensions.EXT_blend_minmax &&
  66                               ctx->Extensions.EXT_blend_subtract &&
  67                               ctx->Extensions.EXT_fog_coord &&
  68                               ctx->Extensions.EXT_multi_draw_arrays &&
  69                               ctx->Extensions.EXT_point_parameters &&
  70                               ctx->Extensions.EXT_secondary_color &&
  71                               ctx->Extensions.EXT_stencil_wrap &&
  72                               ctx->Extensions.EXT_texture_lod_bias &&
  73                               ctx->Extensions.SGIS_generate_mipmap);
  74    const GLboolean ver_1_5 = (ver_1_4 &&
  75                               ctx->Extensions.ARB_occlusion_query &&
  76                               ctx->Extensions.ARB_vertex_buffer_object &&
  77                               ctx->Extensions.EXT_shadow_funcs);
  78    const GLboolean ver_2_0 = (ver_1_5 &&
  79                               ctx->Extensions.ARB_draw_buffers &&
  80                               ctx->Extensions.ARB_point_sprite &&
  81                               ctx->Extensions.ARB_shader_objects &&
  82                               ctx->Extensions.ARB_vertex_shader &&
  83                               ctx->Extensions.ARB_fragment_shader &&
  84                               ctx->Extensions.ARB_texture_non_power_of_two &&
  85                               ctx->Extensions.EXT_blend_equation_separate &&
  86
  87                               /* Technically, 2.0 requires the functionality
  88                                * of the EXT version.  Enable 2.0 if either
  89                                * extension is available, and assume that a
  90                                * driver that only exposes the ATI extension
  91                                * will fallback to software when necessary.
  92                                */
  93                               (ctx->Extensions.EXT_stencil_two_side
  94                                || ctx->Extensions.ATI_separate_stencil));
  95    const GLboolean ver_2_1 = (ver_2_0 &&
  96                               ctx->Extensions.ARB_shading_language_120 &&
  97                               ctx->Extensions.EXT_pixel_buffer_object &&
  98                               ctx->Extensions.EXT_texture_sRGB);
  99    if (ver_2_1)
 100       return version_2_1;
 101    if (ver_2_0)
 102       return version_2_0;
 103    if (ver_1_5)
 104       return version_1_5;
 105    if (ver_1_4)
 106       return version_1_4;
 107    if (ver_1_3)
 108       return version_1_3;
 109    return version_1_2;
 110 }
 111
 112
 113
 114 /**
 115  * Query string-valued state.  The return value should _not_ be freed by
 116  * the caller.
 117  *
 118  * \param name  the state variable to query.
 119  *
 120  * \sa glGetString().
 121  *
 122  * Tries to get the string from dd_function_table::GetString, otherwise returns
 123  * the hardcoded strings.
 124  */
 125 const GLubyte * GLAPIENTRY
 126 _mesa_GetString( GLenum name )
 127 {
 128    GET_CURRENT_CONTEXT(ctx);
 129    static const char *vendor = "Brian Paul";
 130    static const char *renderer = "Mesa";
 131
 132    if (!ctx)
 133       return NULL;
 134
 135    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, NULL);
 136
 137    /* this is a required driver function */
 138    assert(ctx->Driver.GetString);
 139    {
 140       /* Give the driver the chance to handle this query */
 141       const GLubyte *str = (*ctx->Driver.GetString)(ctx, name);
 142       if (str)
 143          return str;
 144    }
 145
 146    switch (name) {
 147       case GL_VENDOR:
 148          return (const GLubyte *) vendor;
 149       case GL_RENDERER:
 150          return (const GLubyte *) renderer;
 151       case GL_VERSION:
 152          return (const GLubyte *) compute_version(ctx);
 153       case GL_EXTENSIONS:
 154          if (!ctx->Extensions.String)
 155             ctx->Extensions.String = _mesa_make_extension_string(ctx);
 156          return (const GLubyte *) ctx->Extensions.String;
 157 #if FEATURE_ARB_shading_language_100
 158       case GL_SHADING_LANGUAGE_VERSION_ARB:
 159          if (ctx->Extensions.ARB_shading_language_120)
 160             return (const GLubyte *) "1.20";
 161          else if (ctx->Extensions.ARB_shading_language_100)
 162             return (const GLubyte *) "1.10";
 163          goto error;
 164 #endif
 165 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program || \
 166     FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 167       case GL_PROGRAM_ERROR_STRING_NV:
 168          if (ctx->Extensions.NV_fragment_program ||
 169              ctx->Extensions.ARB_fragment_program ||
 170              ctx->Extensions.NV_vertex_program ||
 171              ctx->Extensions.ARB_vertex_program) {
 172             return (const GLubyte *) ctx->Program.ErrorString;
 173          }
 174          /* FALL-THROUGH */
 175 #endif
 176 #if FEATURE_ARB_shading_language_100
 177       error:
 178 #endif
 179       default:
 180          _mesa_error( ctx, GL_INVALID_ENUM, "glGetString" );
 181          return (const GLubyte *) 0;
 182    }
 183 }
 184
 185
 186 /**
 187  * Return pointer-valued state, such as a vertex array pointer.
 188  *
 189  * \param pname  names state to be queried
 190  * \param params  returns the pointer value
 191  *
 192  * \sa glGetPointerv().
 193  *
 194  * Tries to get the specified pointer via dd_function_table::GetPointerv,
 195  * otherwise gets the specified pointer from the current context.
 196  */
 197 void GLAPIENTRY
 198 _mesa_GetPointerv( GLenum pname, GLvoid **params )
 199 {
 200    GET_CURRENT_CONTEXT(ctx);
 201    const GLuint clientUnit = ctx->Array.ActiveTexture;
 202    ASSERT_OUTSIDE_BEGIN_END(ctx);
 203
 204    if (!params)
 205       return;
 206
 207    if (MESA_VERBOSE & VERBOSE_API)
 208       _mesa_debug(ctx, "glGetPointerv %s\n", _mesa_lookup_enum_by_nr(pname));
 209
 210    if (ctx->Driver.GetPointerv
 211        && (*ctx->Driver.GetPointerv)(ctx, pname, params))
 212       return;
 213
 214    switch (pname) {
 215       case GL_VERTEX_ARRAY_POINTER:
 216          *params = (GLvoid *) ctx->Array.ArrayObj->Vertex.Ptr;
 217          break;
 218       case GL_NORMAL_ARRAY_POINTER:
 219          *params = (GLvoid *) ctx->Array.ArrayObj->Normal.Ptr;
 220          break;
 221       case GL_COLOR_ARRAY_POINTER:
 222          *params = (GLvoid *) ctx->Array.ArrayObj->Color.Ptr;
 223          break;
 224       case GL_SECONDARY_COLOR_ARRAY_POINTER_EXT:
 225          *params = (GLvoid *) ctx->Array.ArrayObj->SecondaryColor.Ptr;
 226          break;
 227       case GL_FOG_COORDINATE_ARRAY_POINTER_EXT:
 228          *params = (GLvoid *) ctx->Array.ArrayObj->FogCoord.Ptr;
 229          break;
 230       case GL_INDEX_ARRAY_POINTER:
 231          *params = (GLvoid *) ctx->Array.ArrayObj->Index.Ptr;
 232          break;
 233       case GL_TEXTURE_COORD_ARRAY_POINTER:
 234          *params = (GLvoid *) ctx->Array.ArrayObj->TexCoord[clientUnit].Ptr;
 235          break;
 236       case GL_EDGE_FLAG_ARRAY_POINTER:
 237          *params = (GLvoid *) ctx->Array.ArrayObj->EdgeFlag.Ptr;
 238          break;
 239       case GL_FEEDBACK_BUFFER_POINTER:
 240          *params = ctx->Feedback.Buffer;
 241          break;
 242       case GL_SELECTION_BUFFER_POINTER:
 243          *params = ctx->Select.Buffer;
 244          break;
 245       default:
 246          _mesa_error( ctx, GL_INVALID_ENUM, "glGetPointerv" );
 247          return;
 248    }
 249 }
 250
 251
 252 /**
 253  * Returns the current GL error code, or GL_NO_ERROR.
 254  * \return current error code
 255  *
 256  * Returns __GLcontextRec::ErrorValue.
 257  */
 258 GLenum GLAPIENTRY
 259 _mesa_GetError( void )
 260 {
 261    GET_CURRENT_CONTEXT(ctx);
 262    GLenum e = ctx->ErrorValue;
 263    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
 264
 265    if (MESA_VERBOSE & VERBOSE_API)
 266       _mesa_debug(ctx, "glGetError <-- %s\n", _mesa_lookup_enum_by_nr(e));
 267
 268    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
 269    ctx->ErrorDebugCount = 0;
 270    return e;
 271 }