st/mesa: add PIPE_CAP_GLSL_FEATURE_LEVEL, cleanup st_extensions.c

v2: handle the cap in r300 and r600 as well

Additional info for r600g:
   The env var R600_GLSL130=1 enables GLSL 1.3.
   Along with R600_STREAMOUT=1, it enables full GL 3.

5 files changed, 13 insertions, 1 deletions

diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index 8161c64253d..2af9f74e902 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -94,6 +94,9 @@ The integer capabilities:
   the vertex colors are never clamped. This is the default for DX10 hardware.
   If both clamped and unclamped CAPs are supported, the clamping can be
   controlled through pipe_rasterizer_state.
+* ``PIPE_CAP_GLSL_FEATURE_LEVEL``: Whether the driver supports features
+  equivalent to a specific GLSL version. E.g. for GLSL 1.3, report 130.
+
 
 
 .. _pipe_capf:
diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index 48a65696359..9a9418bc927 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -105,6 +105,9 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_VERTEX_COLOR_CLAMPED:
             return 1;
 
+        case PIPE_CAP_GLSL_FEATURE_LEVEL:
+            return 120;
+
         /* r300 cannot do swizzling of compressed textures. Supported otherwise. */
         case PIPE_CAP_TEXTURE_SWIZZLE:
             return util_format_s3tc_enabled ? r300screen->caps.dxtc_swizzle : 1;
diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index c38fbc59c5a..1123557a5ec 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -367,6 +367,9 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
 		return 1;
 
+	case PIPE_CAP_GLSL_FEATURE_LEVEL:
+		return debug_get_bool_option("R600_GLSL130", FALSE) ? 130 : 120;
+
 	/* Supported except the original R600. */
 	case PIPE_CAP_INDEP_BLEND_ENABLE:
 	case PIPE_CAP_INDEP_BLEND_FUNC:
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 37bbc43f325..6cafeafbe19 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -132,6 +132,8 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED: /* draw module */
    case PIPE_CAP_VERTEX_COLOR_CLAMPED: /* draw module */
       return 1;
+   case PIPE_CAP_GLSL_FEATURE_LEVEL:
+      return 130;
    default:
       return 0;
    }
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 2cd11f988ab..000be3d86cf 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -487,7 +487,8 @@ enum pipe_cap {
    PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS = 58, /* temporary */
    PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS = 59, /* temporary */
    PIPE_CAP_VERTEX_COLOR_UNCLAMPED = 60,
-   PIPE_CAP_VERTEX_COLOR_CLAMPED = 61
+   PIPE_CAP_VERTEX_COLOR_CLAMPED = 61,
+   PIPE_CAP_GLSL_FEATURE_LEVEL = 62,
 };
 
 /**