mesa: stop truncating MESA_GLSL=dump

this adds a new helper function that can be used to directly dump longer
strings to the log file, such as shaders

fixes #5614

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14755>

src/mesa/main/errors.c

@@ -414,6 +414,11 @@ _mesa_log(const char *fmtString, ...)
    output_if_debug(NULL, s, GL_FALSE);
 }
 
+void
+_mesa_log_direct(const char *string)
+{
+   output_if_debug(NULL, string, GL_TRUE);
+}
 
 /**
  * Report debug information from the shader compiler via GL_ARB_debug_output.

src/mesa/main/errors.h

@@ -66,6 +66,10 @@ _mesa_debug( const struct gl_context *ctx, const char *fmtString, ... ) PRINTFLI
 extern void
 _mesa_log(const char *fmtString, ...) PRINTFLIKE(1, 2);
 
+extern void
+_mesa_log_direct(const char *string);
+
+
 extern FILE *
 _mesa_get_log_file(void);
 

src/mesa/main/shaderapi.c

@@ -1203,7 +1203,7 @@ _mesa_compile_shader(struct gl_context *ctx, struct gl_shader *sh)
       if (ctx->_Shader->Flags & GLSL_DUMP) {
          _mesa_log("GLSL source for %s shader %d:\n",
                  _mesa_shader_stage_to_string(sh->Stage), sh->Name);
-         _mesa_log("%s\n", sh->Source);
+         _mesa_log_direct(sh->Source);
       }
 
       ensure_builtin_types(ctx);