Mesa (gallium-mesa-7.4): mesa: fix sw fallback state validation bug

[Alan Hourihane]

Module: Mesa
Branch: gallium-mesa-7.4
Commit: 819b028a8e74bf67d28bf8b29efc7cc5dcb2a758
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=819b028a8e74bf67d28bf8b29efc7cc5dcb2a758

Author: Brian Paul <brianp at vmware.com>
Date:   Tue Mar  3 14:25:28 2009 -0700

mesa: fix sw fallback state validation bug

When a hw driver fell back to swrast, swrast wasn't always getting informed
of program changes.  When fixed function is translated into shaders, flags
like _NEW_LIGHT, _NEW_TEXTURE, etc. should really signal _NEW_PROGRAM.
In this case, swrast wasn't seeing _NEW_PROGRAM when new fragment shaders
were generated.

(cherry picked from master, commit de1caa550700ae38ff791c30f6d482f3efddebd0)

---

 src/mesa/main/state.c |   39 +++++++++++++++++++++++++++++----------
 1 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c
index b6d66d2..5284b7d 100644
--- a/src/mesa/main/state.c
+++ b/src/mesa/main/state.c
@@ -202,13 +202,17 @@ update_program_enables(GLcontext *ctx)
  *
  * This function needs to be called after texture state validation in case
  * we're generating a fragment program from fixed-function texture state.
+ *
+ * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
+ * or fragment program is being used.
  */
-static void
+static GLbitfield
 update_program(GLcontext *ctx)
 {
    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
+   GLbitfield new_state = 0x0;
 
    /*
     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
@@ -278,15 +282,23 @@ update_program(GLcontext *ctx)
 
    /* Let the driver know what's happening:
     */
-   if (ctx->FragmentProgram._Current != prevFP && ctx->Driver.BindProgram) {
-      ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
-                              (struct gl_program *) ctx->FragmentProgram._Current);
+   if (ctx->FragmentProgram._Current != prevFP) {
+      new_state |= _NEW_PROGRAM;
+      if (ctx->Driver.BindProgram) {
+         ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
+                          (struct gl_program *) ctx->FragmentProgram._Current);
+      }
    }
    
-   if (ctx->VertexProgram._Current != prevVP && ctx->Driver.BindProgram) {
-      ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
-                              (struct gl_program *) ctx->VertexProgram._Current);
+   if (ctx->VertexProgram._Current != prevVP) {
+      new_state |= _NEW_PROGRAM;
+      if (ctx->Driver.BindProgram) {
+         ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
+                            (struct gl_program *) ctx->VertexProgram._Current);
+      }
    }
+
+   return new_state;
 }
 
 
@@ -447,6 +459,7 @@ _mesa_update_state_locked( GLcontext *ctx )
 {
    GLbitfield new_state = ctx->NewState;
    GLbitfield prog_flags = _NEW_PROGRAM;
+   GLbitfield new_prog_state = 0x0;
 
    if (MESA_VERBOSE & VERBOSE_STATE)
       _mesa_print_state("_mesa_update_state", new_state);
@@ -528,8 +541,13 @@ _mesa_update_state_locked( GLcontext *ctx )
    if (new_state & _MESA_NEW_NEED_EYE_COORDS) 
       _mesa_update_tnl_spaces( ctx, new_state );
 
-   if (new_state & prog_flags)
-      update_program( ctx );
+   if (new_state & prog_flags) {
+      /* When we generate programs from fixed-function vertex/fragment state
+       * this call may generate/bind a new program.  If so, we need to
+       * propogate the _NEW_PROGRAM flag to the driver.
+       */
+      new_prog_state |= update_program( ctx );
+   }
 
    /*
     * Give the driver a chance to act upon the new_state flags.
@@ -540,7 +558,8 @@ _mesa_update_state_locked( GLcontext *ctx )
     * Set ctx->NewState to zero to avoid recursion if
     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
     */
-   new_state = ctx->NewState;
+ out:
+   new_state = ctx->NewState | new_prog_state;
    ctx->NewState = 0;
    ctx->Driver.UpdateState(ctx, new_state);
    ctx->Array.NewState = 0;