diff options
Diffstat (limited to 'mesalib/src/glsl/pp/sl_pp_extension.c')
| -rw-r--r-- | mesalib/src/glsl/pp/sl_pp_extension.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/mesalib/src/glsl/pp/sl_pp_extension.c b/mesalib/src/glsl/pp/sl_pp_extension.c new file mode 100644 index 000000000..d119677c2 --- /dev/null +++ b/mesalib/src/glsl/pp/sl_pp_extension.c @@ -0,0 +1,178 @@ +/************************************************************************** + * + * Copyright 2009 VMware, Inc. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + +#include <stdlib.h> +#include <string.h> +#include "sl_pp_context.h" +#include "sl_pp_process.h" +#include "sl_pp_public.h" + + +/** + * Declare an extension to the preprocessor. This tells the preprocessor + * which extensions are supported by Mesa. + * The shader still needs to have a "#extension name: behavior" line to enable + * the extension. + */ +int +sl_pp_context_add_extension(struct sl_pp_context *context, + const char *name) +{ + struct sl_pp_extension ext; + + if (context->num_extensions == SL_PP_MAX_EXTENSIONS) { + return -1; + } + + ext.name = sl_pp_context_add_unique_str(context, name); + if (ext.name == -1) { + return -1; + } + + context->extensions[context->num_extensions++] = ext; + + assert(context->num_extensions <= sizeof(context->extensions)); + + return 0; +} + + +/** + * Process a "#extension name: behavior" directive. + */ +int +sl_pp_process_extension(struct sl_pp_context *context, + const struct sl_pp_token_info *input, + unsigned int first, + unsigned int last, + struct sl_pp_process_state *state) +{ + int extension_name = -1; + int behavior = -1; + struct sl_pp_token_info out; + + /* Grab the extension name. */ + if (first < last && input[first].token == SL_PP_IDENTIFIER) { + extension_name = input[first].data.identifier; + first++; + } + if (extension_name == -1) { + strcpy(context->error_msg, "expected identifier after `#extension'"); + return -1; + } + + /* Make sure the extension is supported. */ + if (extension_name == context->dict.all) { + out.data.extension = extension_name; + } else { + unsigned int i; + + out.data.extension = -1; + for (i = 0; i < context->num_extensions; i++) { + if (extension_name == context->extensions[i].name) { + out.data.extension = extension_name; + break; + } + } + } + + /* Grab the colon separating the extension name and behavior. */ + while (first < last && input[first].token == SL_PP_WHITESPACE) { + first++; + } + if (first < last && input[first].token == SL_PP_COLON) { + first++; + } else { + strcpy(context->error_msg, "expected `:' after extension name"); + return -1; + } + while (first < last && input[first].token == SL_PP_WHITESPACE) { + first++; + } + + /* Grab the behavior name. */ + if (first < last && input[first].token == SL_PP_IDENTIFIER) { + behavior = input[first].data.identifier; + first++; + } + if (behavior == -1) { + strcpy(context->error_msg, "expected identifier after `:'"); + return -1; + } + + if (behavior == context->dict.require) { + if (out.data.extension == -1) { + strcpy(context->error_msg, "the required extension is not supported"); + return -1; + } + if (out.data.extension == context->dict.all) { + strcpy(context->error_msg, "invalid behavior for `all' extension: `require'"); + return -1; + } + out.token = SL_PP_EXTENSION_REQUIRE; + } else if (behavior == context->dict.enable) { + if (out.data.extension == -1) { + /* Warning: the extension cannot be enabled. */ + return 0; + } + if (out.data.extension == context->dict.all) { + strcpy(context->error_msg, "invalid behavior for `all' extension: `enable'"); + return -1; + } + out.token = SL_PP_EXTENSION_ENABLE; + } else if (behavior == context->dict.warn) { + if (out.data.extension == -1) { + /* Warning: the extension is not supported. */ + return 0; + } + out.token = SL_PP_EXTENSION_WARN; + } else if (behavior == context->dict.disable) { + if (out.data.extension == -1) { + /* Warning: the extension is not supported. */ + return 0; + } + out.token = SL_PP_EXTENSION_DISABLE; + } else { + strcpy(context->error_msg, "unrecognised behavior name"); + return -1; + } + + /* Grab the end of line. */ + while (first < last && input[first].token == SL_PP_WHITESPACE) { + first++; + } + if (first < last) { + strcpy(context->error_msg, "expected end of line after behavior name"); + return -1; + } + + if (sl_pp_process_out(state, &out)) { + return -1; + } + + return 0; +} |