src/mesa/es/main/specials_es2.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * TUNGSTEN GRAPHICS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  21  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  **************************************************************************/
  24
  25
  26 #include "main/mtypes.h"
  27 #include "main/context.h"
  28 #include "main/imports.h"
  29 #include "main/get.h"
  30
  31
  32 const GLubyte * GLAPIENTRY _es_GetString(GLenum name);
  33
  34
  35 static size_t
  36 append_extension(char **str, const char *ext)
  37 {
  38    char *s = *str;
  39    size_t len = strlen(ext);
  40
  41    if (s) {
  42       memcpy(s, ext, len);
  43       s[len++] = ' ';
  44       s[len] = '\0';
  45
  46       *str += len;
  47    }
  48    else {
  49       len++;
  50    }
  51
  52    return len;
  53 }
  54
  55
  56 static size_t
  57 make_extension_string(const GLcontext *ctx, char *str)
  58 {
  59    size_t len = 0;
  60
  61    len += append_extension(&str, "GL_OES_compressed_paletted_texture");
  62
  63    if (ctx->Extensions.ARB_framebuffer_object) {
  64       len += append_extension(&str, "GL_OES_depth24");
  65       len += append_extension(&str, "GL_OES_depth32");
  66       len += append_extension(&str, "GL_OES_fbo_render_mipmap");
  67       len += append_extension(&str, "GL_OES_rgb8_rgba8");
  68       len += append_extension(&str, "GL_OES_stencil1");
  69       len += append_extension(&str, "GL_OES_stencil4");
  70    }
  71
  72    if (ctx->Extensions.EXT_vertex_array)
  73       len += append_extension(&str, "GL_OES_element_index_uint");
  74    if (ctx->Extensions.ARB_vertex_buffer_object)
  75       len += append_extension(&str, "GL_OES_mapbuffer");
  76
  77    if (ctx->Extensions.EXT_texture3D)
  78       len += append_extension(&str, "GL_OES_texture_3D");
  79    if (ctx->Extensions.ARB_texture_non_power_of_two)
  80       len += append_extension(&str, "GL_OES_texture_npot");
  81    if (ctx->Extensions.EXT_texture_filter_anisotropic)
  82       len += append_extension(&str, "GL_EXT_texture_filter_anisotropic");
  83
  84    len += append_extension(&str, "GL_EXT_texture_type_2_10_10_10_REV");
  85    if (ctx->Extensions.ARB_depth_texture)
  86       len += append_extension(&str, "GL_OES_depth_texture");
  87    if (ctx->Extensions.EXT_packed_depth_stencil)
  88       len += append_extension(&str, "GL_OES_packed_depth_stencil");
  89    if (ctx->Extensions.ARB_fragment_shader)
  90       len += append_extension(&str, "GL_OES_standard_derivatives");
  91
  92    if (ctx->Extensions.EXT_texture_compression_s3tc)
  93       len += append_extension(&str, "GL_EXT_texture_compression_dxt1");
  94    if (ctx->Extensions.EXT_blend_minmax)
  95       len += append_extension(&str, "GL_EXT_blend_minmax");
  96    if (ctx->Extensions.EXT_multi_draw_arrays)
  97       len += append_extension(&str, "GL_EXT_multi_draw_arrays");
  98
  99 #if FEATURE_OES_EGL_image
 100    if (ctx->Extensions.OES_EGL_image)
 101       len += append_extension(&str, "GL_OES_EGL_image");
 102 #endif
 103
 104    return len;
 105 }
 106
 107
 108 static const GLubyte *
 109 compute_es_extensions(void)
 110 {
 111    GET_CURRENT_CONTEXT(ctx);
 112
 113    if (!ctx->Extensions.String) {
 114       char *s;
 115       unsigned int len;
 116
 117       len = make_extension_string(ctx, NULL);
 118       s = (char *) malloc(len + 1);
 119       if (!s)
 120          return NULL;
 121       make_extension_string(ctx, s);
 122       ctx->Extensions.String = (const GLubyte *) s;
 123    }
 124
 125    return ctx->Extensions.String;
 126 }
 127
 128 const GLubyte * GLAPIENTRY
 129 _es_GetString(GLenum name)
 130 {
 131    switch (name) {
 132    case GL_SHADING_LANGUAGE_VERSION:
 133       return (const GLubyte *) "OpenGL ES GLSL ES 1.0.16";
 134    case GL_EXTENSIONS:
 135       return compute_es_extensions();
 136    default:
 137       return _mesa_GetString(name);
 138    }
 139 }