1 files changed, 172 insertions, 0 deletions

diff --git a/mesalib/src/glsl/glsl_parser_extras.cpp b/mesalib/src/glsl/glsl_parser_extras.cpp
index f1fdd3a47..d36089226 100644
--- a/mesalib/src/glsl/glsl_parser_extras.cpp
+++ b/mesalib/src/glsl/glsl_parser_extras.cpp
@@ -37,6 +37,16 @@ extern "C" {
 #include "ir_optimization.h"
 #include "loop_analysis.h"
 
+/**
+ * Format a short human-readable description of the given GLSL version.
+ */
+const char *
+glsl_compute_version_string(void *mem_ctx, bool is_es, unsigned version)
+{
+   return ralloc_asprintf(mem_ctx, "GLSL%s %d.%02d", is_es ? " ES" : "",
+                          version / 100, version % 100);
+}
+
 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
 					       GLenum target, void *mem_ctx)
  : ctx(_ctx)
@@ -82,6 +92,8 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
    this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
    this->Const.MaxTextureImageUnits = ctx->Const.MaxTextureImageUnits;
    this->Const.MaxFragmentUniformComponents = ctx->Const.FragmentProgram.MaxUniformComponents;
+   this->Const.MinProgramTexelOffset = ctx->Const.MinProgramTexelOffset;
+   this->Const.MaxProgramTexelOffset = ctx->Const.MaxProgramTexelOffset;
 
    this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
 
@@ -113,6 +125,166 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
    this->default_uniform_qualifier->flags.q.column_major = 1;
 }
 
+/**
+ * Determine whether the current GLSL version is sufficiently high to support
+ * a certain feature, and generate an error message if it isn't.
+ *
+ * \param required_glsl_version and \c required_glsl_es_version are
+ * interpreted as they are in _mesa_glsl_parse_state::is_version().
+ *
+ * \param locp is the parser location where the error should be reported.
+ *
+ * \param fmt (and additional arguments) constitute a printf-style error
+ * message to report if the version check fails.  Information about the
+ * current and required GLSL versions will be appended.  So, for example, if
+ * the GLSL version being compiled is 1.20, and check_version(130, 300, locp,
+ * "foo unsupported") is called, the error message will be "foo unsupported in
+ * GLSL 1.20 (GLSL 1.30 or GLSL 3.00 ES required)".
+ */
+bool
+_mesa_glsl_parse_state::check_version(unsigned required_glsl_version,
+                                      unsigned required_glsl_es_version,
+                                      YYLTYPE *locp, const char *fmt, ...)
+{
+   if (this->is_version(required_glsl_version, required_glsl_es_version))
+      return true;
+
+   va_list args;
+   va_start(args, fmt);
+   char *problem = ralloc_vasprintf(ctx, fmt, args);
+   va_end(args);
+   const char *glsl_version_string
+      = glsl_compute_version_string(ctx, false, required_glsl_version);
+   const char *glsl_es_version_string
+      = glsl_compute_version_string(ctx, true, required_glsl_es_version);
+   const char *requirement_string = "";
+   if (required_glsl_version && required_glsl_es_version) {
+      requirement_string = ralloc_asprintf(ctx, " (%s or %s required)",
+                                           glsl_version_string,
+                                           glsl_es_version_string);
+   } else if (required_glsl_version) {
+      requirement_string = ralloc_asprintf(ctx, " (%s required)",
+                                           glsl_version_string);
+   } else if (required_glsl_es_version) {
+      requirement_string = ralloc_asprintf(ctx, " (%s required)",
+                                           glsl_es_version_string);
+   }
+   _mesa_glsl_error(locp, this, "%s in %s%s.",
+                    problem, this->get_version_string(),
+                    requirement_string);
+
+   return false;
+}
+
+/**
+ * Process a GLSL #version directive.
+ *
+ * \param version is the integer that follows the #version token.
+ *
+ * \param ident is a string identifier that follows the integer, if any is
+ * present.  Otherwise NULL.
+ */
+void
+_mesa_glsl_parse_state::process_version_directive(YYLTYPE *locp, int version,
+                                                  const char *ident)
+{
+   bool es_token_present = false;
+   if (ident) {
+      if (strcmp(ident, "es") == 0) {
+         es_token_present = true;
+      } else {
+         _mesa_glsl_error(locp, this,
+                          "Illegal text following version number\n");
+      }
+   }
+
+   bool supported = false;
+
+   if (es_token_present) {
+      this->es_shader = true;
+      switch (version) {
+      case 100:
+         _mesa_glsl_error(locp, this,
+                          "GLSL 1.00 ES should be selected using "
+                          "`#version 100'\n");
+         supported = this->ctx->API == API_OPENGLES2 ||
+            this->ctx->Extensions.ARB_ES2_compatibility;
+         break;
+      case 300:
+         supported = _mesa_is_gles3(this->ctx) ||
+	    this->ctx->Extensions.ARB_ES3_compatibility;
+         break;
+      default:
+         supported = false;
+         break;
+      }
+   } else {
+      switch (version) {
+      case 100:
+         this->es_shader = true;
+         supported = this->ctx->API == API_OPENGLES2 ||
+            this->ctx->Extensions.ARB_ES2_compatibility;
+         break;
+      case 110:
+      case 120:
+         /* FINISHME: Once the OpenGL 3.0 'forward compatible' context or
+          * the OpenGL 3.2 Core context is supported, this logic will need
+          * change.  Older versions of GLSL are no longer supported
+          * outside the compatibility contexts of 3.x.
+          */
+      case 130:
+      case 140:
+      case 150:
+      case 330:
+      case 400:
+      case 410:
+      case 420:
+         supported = _mesa_is_desktop_gl(this->ctx) &&
+            ((unsigned) version) <= this->ctx->Const.GLSLVersion;
+         break;
+      default:
+         supported = false;
+         break;
+      }
+   }
+
+   this->language_version = version;
+
+   if (!supported) {
+      _mesa_glsl_error(locp, this, "%s is not supported. "
+                       "Supported versions are: %s\n",
+                       this->get_version_string(),
+                       this->supported_version_string);
+
+      /* On exit, the language_version must be set to a valid value.
+       * Later calls to _mesa_glsl_initialize_types will misbehave if
+       * the version is invalid.
+       */
+      switch (this->ctx->API) {
+      case API_OPENGL_COMPAT:
+      case API_OPENGL_CORE:
+	 this->language_version = this->ctx->Const.GLSLVersion;
+	 break;
+
+      case API_OPENGLES:
+	 assert(!"Should not get here.");
+	 /* FALLTHROUGH */
+
+      case API_OPENGLES2:
+	 this->language_version = 100;
+	 break;
+      }
+   }
+
+   if (this->language_version >= 140) {
+      this->ARB_uniform_buffer_object_enable = true;
+   }
+
+   if (this->language_version == 300 && this->es_shader) {
+      this->ARB_explicit_attrib_location_enable = true;
+   }
+}
+
 const char *
 _mesa_glsl_shader_target_name(enum _mesa_glsl_parser_targets target)
 {