mesa,glsl,st/dri: add a new driconf option force_glsl_version for Unigine

See documentation in mtypes.h.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/gallium/include/state_tracker/st_api.h

@@ -239,9 +239,10 @@ struct st_visual
  */
 struct st_config_options
 {
-   boolean force_glsl_extensions_warn;
-   boolean disable_glsl_line_continuations;
    boolean disable_blend_func_extended;
+   boolean disable_glsl_line_continuations;
+   boolean force_glsl_extensions_warn;
+   unsigned force_glsl_version;
    boolean force_s3tc_enable;
 };
 

src/gallium/state_trackers/dri/common/dri_context.c

@@ -42,12 +42,14 @@
 static void dri_fill_st_options(struct st_config_options *options,
                                 const struct driOptionCache * optionCache)
 {
-   options->force_glsl_extensions_warn =
-      driQueryOptionb(optionCache, "force_glsl_extensions_warn");
-   options->disable_glsl_line_continuations =
-      driQueryOptionb(optionCache, "disable_glsl_line_continuations");
    options->disable_blend_func_extended =
       driQueryOptionb(optionCache, "disable_blend_func_extended");
+   options->disable_glsl_line_continuations =
+      driQueryOptionb(optionCache, "disable_glsl_line_continuations");
+   options->force_glsl_extensions_warn =
+      driQueryOptionb(optionCache, "force_glsl_extensions_warn");
+   options->force_glsl_version =
+      driQueryOptioni(optionCache, "force_glsl_version");
    options->force_s3tc_enable =
       driQueryOptionb(optionCache, "force_s3tc_enable");
 }

src/gallium/state_trackers/dri/common/dri_screen.c

@@ -63,6 +63,7 @@ PUBLIC const char __driConfigOptions[] =
          DRI_CONF_FORCE_GLSL_EXTENSIONS_WARN("false")
          DRI_CONF_DISABLE_GLSL_LINE_CONTINUATIONS("false")
          DRI_CONF_DISABLE_BLEND_FUNC_EXTENDED("false")
+         DRI_CONF_FORCE_GLSL_VERSION(0)
       DRI_CONF_SECTION_END
 
       DRI_CONF_SECTION_MISCELLANEOUS
@@ -72,7 +73,7 @@ PUBLIC const char __driConfigOptions[] =
 
 #define false 0
 
-static const uint __driNConfigOptions = 11;
+static const uint __driNConfigOptions = 12;
 
 static const __DRIconfig **
 dri_fill_in_modes(struct dri_screen *screen)

src/gallium/state_trackers/osmesa/osmesa.c

@@ -546,6 +546,7 @@ OSMesaCreateContextExt(GLenum format, GLint depthBits, GLint stencilBits,
    attribs.options.disable_blend_func_extended = FALSE;
    attribs.options.disable_glsl_line_continuations = FALSE;
    attribs.options.force_s3tc_enable = FALSE;
+   attribs.options.force_glsl_version = 0;
 
    osmesa_init_st_visual(&attribs.visual,
                          PIPE_FORMAT_R8G8B8A8_UNORM,

src/glsl/glsl_parser_extras.cpp

@@ -74,7 +74,8 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
    this->num_builtins_to_link = 0;
 
    /* Set default language version and extensions */
-   this->language_version = 110;
+   this->language_version = ctx->Const.ForceGLSLVersion ?
+                            ctx->Const.ForceGLSLVersion : 110;
    this->es_shader = false;
    this->ARB_texture_rectangle_enable = true;
 

src/mesa/drivers/dri/common/drirc

@@ -1,3 +1,27 @@
+<!--
+
+============================================
+Application bugs worked around in this file:
+============================================
+
+* Various Unigine products don't use the #version and #extension GLSL
+  directives, meaning they only get GLSL 1.10 and no extensions for their
+  shaders.
+  Enabling all extensions for Unigine fixes most issues, but the GLSL version
+  is still 1.10.
+
+* Unigine Heaven 3.0 with ARB_texture_multisample uses a "ivec4 * vec4"
+  expression, which fails to compile with GLSL 1.10.
+  Adding "#version 130" fixes this.
+
+* Unigine Heaven 3.0 with ARB_shader_bit_encoding uses the uint keyword, which
+  fails to compile with GLSL 1.10.
+  Adding "#version 130" fixes this.
+
+TODO: document the other workarounds.
+
+-->
+
 <driconf>
     <!-- Please always enable app-specific workarounds for all drivers and
          screens. -->
@@ -6,30 +30,40 @@
             <option name="force_glsl_extensions_warn" value="true" />
             <option name="disable_blend_func_extended" value="true" />
 	</application>
+
         <application name="Unigine Tropics" executable="Tropics">
             <option name="force_glsl_extensions_warn" value="true" />
             <option name="disable_blend_func_extended" value="true" />
 	</application>
+
         <application name="Unigine Heaven (32-bit)" executable="heaven_x86">
             <option name="force_glsl_extensions_warn" value="true" />
             <option name="disable_blend_func_extended" value="true" />
+            <option name="force_glsl_version" value="130" />
 	</application>
+
         <application name="Unigine Heaven (64-bit)" executable="heaven_x64">
             <option name="force_glsl_extensions_warn" value="true" />
             <option name="disable_blend_func_extended" value="true" />
+            <option name="force_glsl_version" value="130" />
 	</application>
+
         <application name="Unigine OilRush (32-bit)" executable="OilRush_x86">
             <option name="disable_blend_func_extended" value="true" />
 	</application>
+
         <application name="Unigine OilRush (64-bit)" executable="OilRush_x64">
             <option name="disable_blend_func_extended" value="true" />
 	</application>
+
         <application name="Savage 2" executable="savage2.bin">
             <option name="disable_glsl_line_continuations" value="true" />
         </application>
+
         <application name="Topogun (32-bit)" executable="topogun32">
             <option name="always_have_depth_buffer" value="true" />
         </application>
+
         <application name="Topogun (64-bit)" executable="topogun64">
             <option name="always_have_depth_buffer" value="true" />
         </application>

src/mesa/drivers/dri/common/xmlpool/t_options.h

@@ -95,6 +95,11 @@ DRI_CONF_OPT_BEGIN_B(disable_glsl_line_continuations, def) \
         DRI_CONF_DESC(en,gettext("Disable backslash-based line continuations in GLSL source")) \
 DRI_CONF_OPT_END
 
+#define DRI_CONF_FORCE_GLSL_VERSION(def) \
+DRI_CONF_OPT_BEGIN_V(force_glsl_version, int, def, "0:999") \
+        DRI_CONF_DESC(en,gettext("Force a default GLSL version for shaders that lack an explicit #version line")) \
+DRI_CONF_OPT_END
+
 
 
 /**

src/mesa/main/mtypes.h

@@ -2873,6 +2873,12 @@ struct gl_constants
     */
    GLboolean ForceGLSLExtensionsWarn;
 
+   /**
+    * If non-zero, forces GLSL shaders without the #version directive to behave
+    * as if they began with "#version ForceGLSLVersion".
+    */
+   GLuint ForceGLSLVersion;
+
    /**
     * Does the driver support real 32-bit integers?  (Otherwise, integers are
     * simulated via floats.)

src/mesa/state_tracker/st_extensions.c

@@ -598,6 +598,11 @@ void st_init_extensions(struct st_context *st)
 
    _mesa_override_glsl_version(st->ctx);
 
+   if (st->options.force_glsl_version > 0 &&
+       st->options.force_glsl_version <= ctx->Const.GLSLVersion) {
+      ctx->Const.ForceGLSLVersion = st->options.force_glsl_version;
+   }
+
    if (ctx->Const.GLSLVersion >= 130) {
       ctx->Const.NativeIntegers = GL_TRUE;
       ctx->Const.MaxClipPlanes = 8;