tests: allow passing shader strings directly.

This makes writing tests using text shaders possible

tests/testvirgl_encode.c

@@ -178,16 +178,19 @@ int virgl_encode_rasterizer_state(struct virgl_context *ctx,
 int virgl_encode_shader_state(struct virgl_context *ctx,
                              uint32_t handle,
 			     uint32_t type,
-                             const struct pipe_shader_state *shader)
+			      const struct pipe_shader_state *shader,
+			      const char *shad_str)
 {
    char *str;
    uint32_t shader_len, len;
    int i;
    int ret;
    uint32_t tmp;
-   int num_tokens = tgsi_num_tokens(shader->tokens);
+   int num_tokens;
    int str_total_size = 65536;
 
+   if (!shad_str) {
+       num_tokens = tgsi_num_tokens(shader->tokens);
        str = CALLOC(1, str_total_size);
        if (!str)
 	   return -1;
@@ -198,6 +201,10 @@ int virgl_encode_shader_state(struct virgl_context *ctx,
 	   FREE(str);
 	   return -1;
        }
+   } else {
+       num_tokens = 0;
+       str = (char *)shad_str;
+   }
 
    shader_len = strlen(str) + 1;
    len = ((shader_len + 3) / 4) + VIRGL_OBJ_SHADER_HDR_SIZE(shader->stream_output.num_outputs);
@@ -222,6 +229,7 @@ int virgl_encode_shader_state(struct virgl_context *ctx,
    }
    virgl_encoder_write_block(ctx->cbuf, (uint8_t *)str, shader_len);
 
+   if (str != shad_str)
        FREE(str);
    return 0;
 }

tests/testvirgl_encode.h

@@ -49,7 +49,8 @@ extern int virgl_encode_rasterizer_state(struct virgl_context *ctx,
 extern int virgl_encode_shader_state(struct virgl_context *ctx,
                                     uint32_t handle,
                                     uint32_t type,
-                                    const struct pipe_shader_state *shader);
+				     const struct pipe_shader_state *shader,
+				     const char *shad_str);
 
 int virgl_encode_stream_output_info(struct virgl_context *ctx,
                                    uint32_t handle,