extensions.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

   ctx->Extensions.NV_point_sprite = GL_TRUE;
   ctx->Extensions.NV_texture_rectangle = GL_TRUE;
   /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
#if FEATURE_NV_vertex_program
   ctx->Extensions.NV_vertex_program = GL_TRUE;
   ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
#endif
#if FEATURE_NV_fragment_program
   ctx->Extensions.NV_fragment_program = GL_TRUE;
#endif
   ctx->Extensions.SGI_color_matrix = GL_TRUE;
   ctx->Extensions.SGI_color_table = GL_TRUE;
   ctx->Extensions.SGI_texture_color_table = GL_TRUE;
   ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
   ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
   ctx->Extensions.SGIX_depth_texture = GL_TRUE;
   ctx->Extensions.SGIX_shadow = GL_TRUE;
   ctx->Extensions.SGIX_shadow_ambient = GL_TRUE;
#if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
   ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
#endif
}


/**
 * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 */
void
_mesa_enable_imaging_extensions(GLcontext *ctx)
{
   ctx->Extensions.ARB_imaging = GL_TRUE;
   ctx->Extensions.EXT_blend_color = GL_TRUE;
   ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
   ctx->Extensions.EXT_blend_minmax = GL_TRUE;
   ctx->Extensions.EXT_blend_subtract = GL_TRUE;
   ctx->Extensions.EXT_convolution = GL_TRUE;
   ctx->Extensions.EXT_histogram = GL_TRUE;
   ctx->Extensions.SGI_color_matrix = GL_TRUE;
   ctx->Extensions.SGI_color_table = GL_TRUE;
}



/**
 * Enable all OpenGL 1.3 features and extensions.
 * A convenience function to be called by drivers.
 */
void
_mesa_enable_1_3_extensions(GLcontext *ctx)
{
   ctx->Extensions.ARB_multisample = GL_TRUE;
   ctx->Extensions.ARB_multitexture = GL_TRUE;
   ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
   ctx->Extensions.ARB_texture_compression = GL_TRUE;
   ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
   ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
   ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
   ctx->Extensions.EXT_texture_env_add = GL_TRUE;
   /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
}



/**
 * Enable all OpenGL 1.4 features and extensions.
 * A convenience function to be called by drivers.
 */
void
_mesa_enable_1_4_extensions(GLcontext *ctx)
{
   ctx->Extensions.ARB_depth_texture = GL_TRUE;
   ctx->Extensions.ARB_shadow = GL_TRUE;
   ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
   ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
   ctx->Extensions.ARB_window_pos = GL_TRUE;
   ctx->Extensions.EXT_blend_color = GL_TRUE;
   ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
   ctx->Extensions.EXT_blend_minmax = GL_TRUE;
   ctx->Extensions.EXT_blend_subtract = GL_TRUE;
   ctx->Extensions.EXT_fog_coord = GL_TRUE;
   ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
   ctx->Extensions.EXT_point_parameters = GL_TRUE;
   ctx->Extensions.EXT_secondary_color = GL_TRUE;
   ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
   ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
   ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
}


/**
 * Enable all OpenGL 1.5 features and extensions.
 * A convenience function to be called by drivers.
 */
void
_mesa_enable_1_5_extensions(GLcontext *ctx)
{
   ctx->Extensions.ARB_occlusion_query = GL_TRUE;
   ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
   ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
}


/**
 * Enable all OpenGL 2.0 features and extensions.
 * A convenience function to be called by drivers.
 */
void
_mesa_enable_2_0_extensions(GLcontext *ctx)
{
   ctx->Extensions.ARB_draw_buffers = GL_TRUE;
#if FEATURE_ARB_fragment_shader
   ctx->Extensions.ARB_fragment_shader = GL_TRUE;
#endif
   ctx->Extensions.ARB_point_sprite = GL_TRUE;
   ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
#if FEATURE_ARB_shader_objects
   ctx->Extensions.ARB_shader_objects = GL_TRUE;
#endif
#if FEATURE_ARB_shading_language_100
   ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
#endif
   ctx->Extensions.EXT_stencil_two_side = GL_FALSE; /* obsolete */
#if FEATURE_ARB_vertex_shader
   ctx->Extensions.ARB_vertex_shader = GL_TRUE;
#endif
}


/**
 * Enable all OpenGL 2.1 features and extensions.
 * A convenience function to be called by drivers.
 */
void
_mesa_enable_2_1_extensions(GLcontext *ctx)
{
#if FEATURE_EXT_pixel_buffer_object
   ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
#endif
#if FEATURE_EXT_texture_sRGB
   ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
#endif
#ifdef FEATURE_ARB_shading_language_120
   ctx->Extensions.ARB_shading_language_120 = GL_FALSE; /* not quite done */
#endif
}



/**
 * Either enable or disable the named extension.
 */
static void
set_extension( GLcontext *ctx, const char *name, GLboolean state )
{
   GLboolean *base = (GLboolean *) &ctx->Extensions;
   GLuint i;

   if (ctx->Extensions.String) {
      /* The string was already queried - can't change it now! */
      _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
      return;
   }

   for (i = 0 ; i < Elements(default_extensions) ; i++) {
      if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
         if (default_extensions[i].flag_offset) {
            GLboolean *enabled = base + default_extensions[i].flag_offset;
            *enabled = state;
         }
         return;
      }
   }
   _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
}


/**
 * Enable the named extension.
 * Typically called by drivers.
 */
void
_mesa_enable_extension( GLcontext *ctx, const char *name )
{
   set_extension(ctx, name, GL_TRUE);
}


/**
 * Disable the named extension.
 * XXX is this really needed???
 */
void
_mesa_disable_extension( GLcontext *ctx, const char *name )
{
   set_extension(ctx, name, GL_FALSE);
}


/**
 * Test if the named extension is enabled in this context.
 */
GLboolean
_mesa_extension_is_enabled( GLcontext *ctx, const char *name )
{
   const GLboolean *base = (const GLboolean *) &ctx->Extensions;
   GLuint i;

   for (i = 0 ; i < Elements(default_extensions) ; i++) {
      if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
         if (!default_extensions[i].flag_offset)
            return GL_TRUE;
         return *(base + default_extensions[i].flag_offset);
      }
   }
   return GL_FALSE;
}


/**
 * Run through the default_extensions array above and set the
 * ctx->Extensions.ARB/EXT_* flags accordingly.
 * To be called during context initialization.
 */
void
_mesa_init_extensions( GLcontext *ctx )
{
   GLboolean *base = (GLboolean *) &ctx->Extensions;
   GLuint i;

   for (i = 0 ; i < Elements(default_extensions) ; i++) {
      if (default_extensions[i].enabled &&
          default_extensions[i].flag_offset) {
         *(base + default_extensions[i].flag_offset) = GL_TRUE;
      }
   }
}


/**
 * Construct the GL_EXTENSIONS string.  Called the first time that
 * glGetString(GL_EXTENSIONS) is called.
 */
GLubyte *
_mesa_make_extension_string( GLcontext *ctx )
{
   const GLboolean *base = (const GLboolean *) &ctx->Extensions;
   GLuint extStrLen = 0;
   GLubyte *s;
   GLuint i;

   /* first, compute length of the extension string */
   for (i = 0 ; i < Elements(default_extensions) ; i++) {
      if (!default_extensions[i].flag_offset ||
          *(base + default_extensions[i].flag_offset)) {
         extStrLen += (GLuint)_mesa_strlen(default_extensions[i].name) + 1;
      }
   }
   s = (GLubyte *) _mesa_malloc(extStrLen);

   /* second, build the extension string */
   extStrLen = 0;
   for (i = 0 ; i < Elements(default_extensions) ; i++) {
      if (!default_extensions[i].flag_offset ||
          *(base + default_extensions[i].flag_offset)) {
         GLuint len = (GLuint)_mesa_strlen(default_extensions[i].name);
         _mesa_memcpy(s + extStrLen, default_extensions[i].name, len);
         extStrLen += len;
         s[extStrLen] = (GLubyte) ' ';
         extStrLen++;
      }
   }
   ASSERT(extStrLen > 0);

   s[extStrLen - 1] = 0;

   return s;
}