vrend: Fall back to NV_shader_atomic_float if ARB_GLES3_1_compatibility is missing

Softpipe doesn't support ARB_GLES3_1_compatibility but can support
NV_shader_atomic_float and this is needed for some dEQP-GLES31 tests to be
run on a softpipe GL host.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>

src/vrend_renderer.c

@@ -5650,6 +5650,7 @@ struct vrend_context *vrend_create_context(int id, uint32_t nlen, const char *de
    grctx->shader_cfg.max_draw_buffers = vrend_state.max_draw_buffers;
    grctx->shader_cfg.has_arrays_of_arrays = has_feature(feat_arrays_of_arrays);
    grctx->shader_cfg.has_gpu_shader5 = has_feature(feat_gpu_shader5);
+   grctx->shader_cfg.has_es31_compat = has_feature(feat_gles31_compatibility);
 
    vrend_renderer_create_sub_ctx(grctx, 0);
    vrend_renderer_set_sub_ctx(grctx, 0);

src/vrend_shader.c

@@ -70,6 +70,7 @@
 #define SHADER_REQ_SEPERATE_SHADER_OBJECTS (1 << 25)
 #define SHADER_REQ_ARRAYS_OF_ARRAYS  (1 << 26)
 #define SHADER_REQ_SHADER_INTEGER_FUNC (1 << 27)
+#define SHADER_REQ_SHADER_ATOMIC_FLOAT (1 << 28)
 
 struct vrend_shader_io {
    unsigned                name;
@@ -264,6 +265,7 @@ static const struct vrend_shader_table shader_req_table[] = {
     { SHADER_REQ_FBFETCH, "EXT_shader_framebuffer_fetch" },
     { SHADER_REQ_SHADER_CLOCK, "ARB_shader_clock" },
     { SHADER_REQ_SHADER_INTEGER_FUNC, "MESA_shader_integer_functions" },
+    { SHADER_REQ_SHADER_ATOMIC_FLOAT, "NV_shader_atomic_float"},
 };
 
 enum vrend_type_qualifier {
@@ -2850,7 +2852,10 @@ translate_atomic(struct dump_ctx *ctx,
         stypecast = INT;
         break;
      case TGSI_RETURN_TYPE_FLOAT:
+        if (ctx->cfg->has_es31_compat)
            ctx->shader_req_bits |= SHADER_REQ_ES31_COMPAT;
+        else
+           ctx->shader_req_bits |= SHADER_REQ_SHADER_ATOMIC_FLOAT;
         stypecast = FLOAT;
         break;
      }

src/vrend_shader.h

@@ -127,6 +127,7 @@ struct vrend_shader_cfg {
    bool use_explicit_locations;
    bool has_arrays_of_arrays;
    bool has_gpu_shader5;
+   bool has_es31_compat;
 };
 
 struct vrend_context;
@@ -135,6 +136,7 @@ struct vrend_context;
 #define SHADER_STRING_VER_EXT 0
 #define SHADER_STRING_HDR 1
 
+
 bool vrend_patch_vertex_shader_interpolants(struct vrend_context *rctx,
                                             struct vrend_shader_cfg *cfg,
                                             struct vrend_strarray *shader,