From: Luca Barbieri <luca@luca-barbieri.com>
Date: Mon, 6 Sep 2010 00:31:20 +0000 (+0200)
Subject: mesa/st: set compiler options based on Gallium shader caps
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b37459388b22fb6a831d45bc08e51cdb7b9c610c;p=mesa.git

mesa/st: set compiler options based on Gallium shader caps

This turns on if conversion and unlimited loop unrolling if control
flow is not supported.

NOTE: this will change the behavior of r300g and any other driver
that doesn't advertise control flow
---

diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index d637e6f43a0..3f91eb78d81 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -162,7 +162,16 @@ void st_init_limits(struct st_context *st)
       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, i, PIPE_SHADER_CAP_MAX_ADDRS);
       pc->MaxNativeParameters      = screen->get_shader_param(screen, i, PIPE_SHADER_CAP_MAX_CONSTS);
 
+      /* TODO: make these more fine-grained if anyone needs it */
+      options->EmitNoIfs = !screen->get_shader_param(screen, i, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
+      options->EmitNoFunctions = !screen->get_shader_param(screen, i, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
+      options->EmitNoLoops = !screen->get_shader_param(screen, i, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
+      options->EmitNoMainReturn = !screen->get_shader_param(screen, i, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
+
       options->EmitNoCont = !screen->get_shader_param(screen, i, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
+
+      if(options->EmitNoLoops)
+         options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, i, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
    }
 
    /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs