driconf: add force_glsl_abs_sqrt option

This will allow to force computing the absolute value for sqrt()
and inversesqrt() in order to follow D3D9 behaviour for buggy
apps that rely on it.

Signed-off-by: Samuel Pitoiset <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

2 files changed, 4 insertions, 0 deletions

diff --git a/src/gallium/include/state_tracker/st_api.h b/src/gallium/include/state_tracker/st_api.h
index bf9a7e95d7c..9d0eb3a8a67 100644
--- a/src/gallium/include/state_tracker/st_api.h
+++ b/src/gallium/include/state_tracker/st_api.h
@@ -248,6 +248,7 @@ struct st_config_options
    boolean allow_glsl_extension_directive_midshader;
    boolean allow_higher_compat_version;
    boolean glsl_zero_init;
+   boolean force_glsl_abs_sqrt;
    unsigned char config_options_sha1[20];
 };
 
diff --git a/src/gallium/state_trackers/dri/dri_screen.c b/src/gallium/state_trackers/dri/dri_screen.c
index 799a2649b04..998e8ef8cbc 100644
--- a/src/gallium/state_trackers/dri/dri_screen.c
+++ b/src/gallium/state_trackers/dri/dri_screen.c
@@ -76,6 +76,7 @@ const __DRIconfigOptionsExtension gallium_config_options = {
          DRI_CONF_FORCE_GLSL_VERSION(0)
          DRI_CONF_ALLOW_GLSL_EXTENSION_DIRECTIVE_MIDSHADER("false")
          DRI_CONF_ALLOW_HIGHER_COMPAT_VERSION("false")
+         DRI_CONF_FORCE_GLSL_ABS_SQRT("false")
       DRI_CONF_SECTION_END
 
       DRI_CONF_SECTION_MISCELLANEOUS
@@ -110,6 +111,8 @@ dri_fill_st_options(struct dri_screen *screen)
    options->allow_higher_compat_version =
       driQueryOptionb(optionCache, "allow_higher_compat_version");
    options->glsl_zero_init = driQueryOptionb(optionCache, "glsl_zero_init");
+   options->force_glsl_abs_sqrt =
+      driQueryOptionb(optionCache, "force_glsl_abs_sqrt");
 
    driComputeOptionsSha1(optionCache, options->config_options_sha1);
 }