mesa: new _NEW_PROGRAM_CONSTANTS flag

This state flag will be used to indicate that vertex/fragment program
constants have changed.  _NEW_PROGRAM will be used to indicate changes
to the vertex/fragment shader itself, or misc related state.

_NEW_PROGRAM_CONSTANTS is also set whenever a program parameter that's
tracking GL state has changed.  For example, if the projection matrix is
in the parameter list, calling glFrustum() will cause _NEW_PROGRAM_CONSTANTS
to be set.  This will let to remove the need for dynamic state atoms in
some drivers.

For now, we still set _NEW_PROGRAM in all the places we used to.  We'll no
longer set _NEW_PROGRAM in glUniform() after drivers/etc have been updated.

2 files changed, 36 insertions, 1 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 3f315900000..30c7cca3b5a 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2615,6 +2615,7 @@ struct gl_matrix_stack
 #define _NEW_TRACK_MATRIX       0x4000000  /**< __GLcontextRec::VertexProgram */
 #define _NEW_PROGRAM            0x8000000  /**< __GLcontextRec::VertexProgram */
 #define _NEW_CURRENT_ATTRIB     0x10000000  /**< __GLcontextRec::Current */
+#define _NEW_PROGRAM_CONSTANTS  0x20000000
 #define _NEW_ALL ~0
 /*@}*/
 
diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c
index 4f9088dd22f..f18fc8f6837 100644
--- a/src/mesa/main/state.c
+++ b/src/mesa/main/state.c
@@ -44,6 +44,7 @@
 #include "pixel.h"
 #endif
 #include "shader/program.h"
+#include "shader/prog_parameter.h"
 #include "state.h"
 #include "stencil.h"
 #include "texenvprogram.h"
@@ -303,6 +304,36 @@ update_program(GLcontext *ctx)
 }
 
 
+/**
+ * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
+ */
+static GLbitfield
+update_program_constants(GLcontext *ctx)
+{
+   GLbitfield new_state = 0x0;
+
+   if (ctx->FragmentProgram._Current) {
+      const struct gl_program_parameter_list *params =
+         ctx->FragmentProgram._Current->Base.Parameters;
+      if (params && params->StateFlags & ctx->NewState) {
+         new_state |= _NEW_PROGRAM_CONSTANTS;
+      }
+   }
+
+   if (ctx->VertexProgram._Current) {
+      const struct gl_program_parameter_list *params =
+         ctx->VertexProgram._Current->Base.Parameters;
+      if (params && params->StateFlags & ctx->NewState) {
+         new_state |= _NEW_PROGRAM_CONSTANTS;
+      }
+   }
+
+   return new_state;
+}
+
+
+
+
 static void
 update_viewport_matrix(GLcontext *ctx)
 {
@@ -554,6 +585,10 @@ _mesa_update_state_locked( GLcontext *ctx )
       new_prog_state |= update_program( ctx );
    }
 
+
+ out:
+   new_prog_state |= update_program_constants(ctx);
+
    /*
     * Give the driver a chance to act upon the new_state flags.
     * The driver might plug in different span functions, for example.
@@ -563,7 +598,6 @@ _mesa_update_state_locked( GLcontext *ctx )
     * Set ctx->NewState to zero to avoid recursion if
     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
     */
- out:
    new_state = ctx->NewState | new_prog_state;
    ctx->NewState = 0;
    ctx->Driver.UpdateState(ctx, new_state);