Stefan Dösinger : wined3d: Pass fogstart== fogend to GL in fog table mode.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: b648b7419170836aaae7192fba5ef974d47fe46b
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=b648b7419170836aaae7192fba...

Author: Stefan Dösinger 
Date:   Tue Jun 18 16:17:18 2013 +0200

wined3d: Pass fogstart==fogend to GL in fog table mode.

---

dlls/wined3d/arb_program_shader.c |    4 +++-
 dlls/wined3d/glsl_shader.c        |    4 +++-
 dlls/wined3d/state.c              |   13 ++++++++++---
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/dlls/wined3d/arb_program_shader.c b/dlls/wined3d/arb_program_shader.c
index fd2df68..3082ba4 100644
--- a/dlls/wined3d/arb_program_shader.c
+++ b/dlls/wined3d/arb_program_shader.c
@@ -6513,6 +6513,8 @@ static void fragment_prog_arbfp(struct wined3d_context *context, const struct wi
 static void state_arbfp_fog(struct wined3d_context *context, const struct wined3d_state *state, DWORD state_id)
 {
     enum fogsource new_source;
+    DWORD fogstart = state->render_states[WINED3D_RS_FOGSTART];
+    DWORD fogend = state->render_states[WINED3D_RS_FOGEND];

TRACE("context %p, state %p, state_id %#x.\n", context, state, state_id);

@@ -6541,7 +6543,7 @@ static void state_arbfp_fog(struct wined3d_context *context, const struct wined3
         new_source = FOGSOURCE_FFP;
     }

-    if (new_source != context->fog_source)
+    if (new_source != context->fog_source || fogstart == fogend)
     {
         context->fog_source = new_source;
         state_fogstartend(context, state, STATE_RENDER(WINED3D_RS_FOGSTART));
diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index e14d7ab..ad9be6a 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -7086,6 +7086,8 @@ static void glsl_fragment_pipe_fog(struct wined3d_context *context,
 {
     BOOL use_vshader = use_vs(state);
     enum fogsource new_source;
+    DWORD fogstart = state->render_states[WINED3D_RS_FOGSTART];
+    DWORD fogend = state->render_states[WINED3D_RS_FOGEND];

context->select_shader = 1;
     context->load_constants = 1;
@@ -7107,7 +7109,7 @@ static void glsl_fragment_pipe_fog(struct wined3d_context *context,
         new_source = FOGSOURCE_FFP;
     }

-    if (new_source != context->fog_source)
+    if (new_source != context->fog_source || fogstart == fogend)
     {
         context->fog_source = new_source;
         state_fogstartend(context, state, STATE_RENDER(WINED3D_RS_FOGSTART));
diff --git a/dlls/wined3d/state.c b/dlls/wined3d/state.c
index ffce803..5d6355b 100644
--- a/dlls/wined3d/state.c
+++ b/dlls/wined3d/state.c
@@ -1043,8 +1043,13 @@ void state_fogstartend(struct wined3d_context *context, const struct wined3d_sta
             fogstart = tmpvalue.f;
             tmpvalue.d = state->render_states[WINED3D_RS_FOGEND];
             fogend = tmpvalue.f;
-            /* In GL, fogstart == fogend disables fog, in D3D everything's fogged.*/
-            if(fogstart == fogend) {
+            /* 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;
             }
@@ -1072,6 +1077,8 @@ void state_fog_fragpart(struct wined3d_context *context, const struct wined3d_st
 {
     const struct wined3d_gl_info *gl_info = context->gl_info;
     enum fogsource new_source;
+    DWORD fogstart = state->render_states[WINED3D_RS_FOGSTART];
+    DWORD fogend = state->render_states[WINED3D_RS_FOGEND];

TRACE("context %p, state %p, state_id %#x.\n", context, state, state_id);

@@ -1217,7 +1224,7 @@ void state_fog_fragpart(struct wined3d_context *context, const struct wined3d_st

glEnableWINE(GL_FOG);
     checkGLcall("glEnable GL_FOG");
-    if (new_source != context->fog_source)
+    if (new_source != context->fog_source || fogstart == fogend)
     {
         context->fog_source = new_source;
         state_fogstartend(context, state, STATE_RENDER(WINED3D_RS_FOGSTART));