Matteo Bruni : wined3d: Introduce a get_fog_start_end() function.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: b02a166cc84a1c61db9e91e26e6b8e0a8662fd19
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=b02a166cc84a1c61db9e91e26e6b8e0a8662fd19

Author: Matteo Bruni <mbruni at codeweavers.com>
Date:   Fri Jun  5 00:37:32 2015 +0200

wined3d: Introduce a get_fog_start_end() function.

---

 dlls/wined3d/state.c           | 41 +-------------------------------------
 dlls/wined3d/utils.c           | 45 ++++++++++++++++++++++++++++++++++++++++++
 dlls/wined3d/wined3d_private.h |  2 ++
 3 files changed, 48 insertions(+), 40 deletions(-)

diff --git a/dlls/wined3d/state.c b/dlls/wined3d/state.c
index 917d155..b7d7f92 100644
--- a/dlls/wined3d/state.c
+++ b/dlls/wined3d/state.c
@@ -1006,47 +1006,8 @@ void state_fogstartend(struct wined3d_context *context, const struct wined3d_sta
 {
     const struct wined3d_gl_info *gl_info = context->gl_info;
     float fogstart, fogend;
-    union {
-        DWORD d;
-        float f;
-    } tmpvalue;
-
-    switch(context->fog_source) {
-        case FOGSOURCE_VS:
-            fogstart = 1.0f;
-            fogend = 0.0f;
-            break;
-
-        case FOGSOURCE_COORD:
-            fogstart = 255.0f;
-            fogend = 0.0f;
-            break;
 
-        case FOGSOURCE_FFP:
-            tmpvalue.d = state->render_states[WINED3D_RS_FOGSTART];
-            fogstart = tmpvalue.f;
-            tmpvalue.d = state->render_states[WINED3D_RS_FOGEND];
-            fogend = tmpvalue.f;
-            /* Special handling for fogstart == fogend. In d3d with vertex
-             * fog, everything is fogged. With table fog, everything with
-             * fog_coord < fog_start is unfogged, and fog_coord > fog_start
-             * is fogged. Windows drivers disagree when fog_coord == fog_start. */
-            if (state->render_states[WINED3D_RS_FOGTABLEMODE] == WINED3D_FOG_NONE
-                    && fogstart == fogend)
-            {
-                fogstart = -INFINITY;
-                fogend = 0.0f;
-            }
-            break;
-
-        default:
-            /* This should not happen.context->fog_source is set in wined3d, not the app.
-             * Still this is needed to make the compiler happy
-             */
-            ERR("Unexpected fog coordinate source\n");
-            fogstart = 0.0f;
-            fogend = 0.0f;
-    }
+    get_fog_start_end(context, state, &fogstart, &fogend);
 
     gl_info->gl_ops.gl.p_glFogf(GL_FOG_START, fogstart);
     checkGLcall("glFogf(GL_FOG_START, fogstart)");
diff --git a/dlls/wined3d/utils.c b/dlls/wined3d/utils.c
index 2a4ac83..ed4262a 100644
--- a/dlls/wined3d/utils.c
+++ b/dlls/wined3d/utils.c
@@ -3654,6 +3654,51 @@ void get_pointsize(const struct wined3d_context *context, const struct wined3d_s
     *out_pointsize = pointsize.f;
 }
 
+void get_fog_start_end(const struct wined3d_context *context, const struct wined3d_state *state,
+        float *start, float *end)
+{
+    union
+    {
+        DWORD d;
+        float f;
+    } tmpvalue;
+
+    switch (context->fog_source)
+    {
+        case FOGSOURCE_VS:
+            *start = 1.0f;
+            *end = 0.0f;
+            break;
+
+        case FOGSOURCE_COORD:
+            *start = 255.0f;
+            *end = 0.0f;
+            break;
+
+        case FOGSOURCE_FFP:
+            tmpvalue.d = state->render_states[WINED3D_RS_FOGSTART];
+            *start = tmpvalue.f;
+            tmpvalue.d = state->render_states[WINED3D_RS_FOGEND];
+            *end = tmpvalue.f;
+            /* Special handling for fog_start == fog_end. In d3d with vertex
+             * fog, everything is fogged. With table fog, everything with
+             * fog_coord < fog_start is unfogged, and fog_coord > fog_start
+             * is fogged. Windows drivers disagree when fog_coord == fog_start. */
+            if (state->render_states[WINED3D_RS_FOGTABLEMODE] == WINED3D_FOG_NONE && *start == *end)
+            {
+                *start = -INFINITY;
+                *end = 0.0f;
+            }
+            break;
+
+        default:
+            /* This should not happen, context->fog_source is set in wined3d, not the app. */
+            ERR("Unexpected fog coordinate source.\n");
+            *start = 0.0f;
+            *end = 0.0f;
+    }
+}
+
 /* This small helper function is used to convert a bitmask into the number of masked bits */
 unsigned int count_bits(unsigned int mask)
 {
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index d9de679..93cfd9e 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -3074,6 +3074,8 @@ void get_pointsize_minmax(const struct wined3d_context *context, const struct wi
         float *out_min, float *out_max) DECLSPEC_HIDDEN;
 void get_pointsize(const struct wined3d_context *context, const struct wined3d_state *state,
         float *out_pointsize, float *out_att) DECLSPEC_HIDDEN;
+void get_fog_start_end(const struct wined3d_context *context, const struct wined3d_state *state,
+        float *start, float *end) DECLSPEC_HIDDEN;
 
 /* Using additional shader constants (uniforms in GLSL / program environment
  * or local parameters in ARB) is costly: