gallium: implement full reference counting for vertex/fragment programs

Use _mesa_reference_vert/fragprog() wherever we assign program pointers.
Fixes a memory corruption bug found with glean/api2 test.
Another memory bug involving shaders yet to be fixed...

3 files changed, 38 insertions, 24 deletions

diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 7b8d9341701..b9053344b26 100755
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -150,8 +150,6 @@ int MESA_DEBUG_FLAGS = 0;
 /* ubyte -> float conversion */
 GLfloat _mesa_ubyte_to_float_color_tab[256];
 
-static void
-free_shared_state( GLcontext *ctx, struct gl_shared_state *ss );
 
 
 /**
@@ -423,12 +421,14 @@ alloc_shared_state( GLcontext *ctx )
 #endif
 
 #if FEATURE_ARB_vertex_program
-   ss->DefaultVertexProgram = ctx->Driver.NewProgram(ctx, GL_VERTEX_PROGRAM_ARB, 0);
+   ss->DefaultVertexProgram = (struct gl_vertex_program *)
+      ctx->Driver.NewProgram(ctx, GL_VERTEX_PROGRAM_ARB, 0);
    if (!ss->DefaultVertexProgram)
       goto cleanup;
 #endif
 #if FEATURE_ARB_fragment_program
-   ss->DefaultFragmentProgram = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
+   ss->DefaultFragmentProgram = (struct gl_fragment_program *)
+      ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
    if (!ss->DefaultFragmentProgram)
       goto cleanup;
 #endif
@@ -513,12 +513,10 @@ alloc_shared_state( GLcontext *ctx )
       _mesa_DeleteHashTable(ss->Programs);
 #endif
 #if FEATURE_ARB_vertex_program
-   if (ss->DefaultVertexProgram)
-      ctx->Driver.DeleteProgram(ctx, ss->DefaultVertexProgram);
+   _mesa_reference_vertprog(ctx, &ss->DefaultVertexProgram, NULL);
 #endif
 #if FEATURE_ARB_fragment_program
-   if (ss->DefaultFragmentProgram)
-      ctx->Driver.DeleteProgram(ctx, ss->DefaultFragmentProgram);
+   _mesa_reference_fragprog(ctx, &ss->DefaultFragmentProgram, NULL);
 #endif
 #if FEATURE_ATI_fragment_shader
    if (ss->DefaultFragmentShader)
@@ -695,10 +693,10 @@ free_shared_state( GLcontext *ctx, struct gl_shared_state *ss )
    _mesa_DeleteHashTable(ss->Programs);
 #endif
 #if FEATURE_ARB_vertex_program
-   ctx->Driver.DeleteProgram(ctx, ss->DefaultVertexProgram);
+   _mesa_reference_vertprog(ctx, &ss->DefaultVertexProgram, NULL);
 #endif
 #if FEATURE_ARB_fragment_program
-   ctx->Driver.DeleteProgram(ctx, ss->DefaultFragmentProgram);
+   _mesa_reference_fragprog(ctx, &ss->DefaultFragmentProgram, NULL);
 #endif
 
 #if FEATURE_ATI_fragment_shader
@@ -1190,6 +1188,14 @@ _mesa_free_context_data( GLcontext *ctx )
       _mesa_unreference_framebuffer(&ctx->ReadBuffer);
    }
 
+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
+
+   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
+   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
+   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
+
    _mesa_free_lighting_data( ctx );
    _mesa_free_eval_data( ctx );
    _mesa_free_texture_data( ctx );
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 50b22d25bf3..463142fe395 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2203,10 +2203,10 @@ struct gl_shared_state
    /*@{*/
    struct _mesa_HashTable *Programs; /**< All vertex/fragment programs */
 #if FEATURE_ARB_vertex_program
-   struct gl_program *DefaultVertexProgram;
+   struct gl_vertex_program *DefaultVertexProgram;
 #endif
 #if FEATURE_ARB_fragment_program
-   struct gl_program *DefaultFragmentProgram;
+   struct gl_fragment_program *DefaultFragmentProgram;
 #endif
    /*@}*/
 
diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c
index 0b1c56fdd5f..90379a17726 100644
--- a/src/mesa/main/state.c
+++ b/src/mesa/main/state.c
@@ -982,16 +982,20 @@ update_program(GLcontext *ctx)
 #endif
    if (shProg && shProg->LinkStatus && shProg->FragmentProgram) {
       /* user-defined fragment shader */
-      ctx->FragmentProgram._Current = shProg->FragmentProgram;
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
+                               shProg->FragmentProgram);
    }
    else if (ctx->FragmentProgram._Enabled) {
       /* use user-defined fragment program */
-      ctx->FragmentProgram._Current = ctx->FragmentProgram.Current;
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
+                               ctx->FragmentProgram.Current);
    }
    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
       /* fragment program generated from fixed-function state */
-      ctx->FragmentProgram._Current = _mesa_get_fixed_func_fragment_program(ctx);
-      ctx->FragmentProgram._TexEnvProgram = ctx->FragmentProgram._Current;
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
+                               _mesa_get_fixed_func_fragment_program(ctx));
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
+                               ctx->FragmentProgram._Current);
 
       /* XXX get rid of this confusing stuff someday? */
       ctx->FragmentProgram._Active = ctx->FragmentProgram._Enabled;
@@ -1000,7 +1004,7 @@ update_program(GLcontext *ctx)
    }
    else {
       /* no fragment program */
-      ctx->FragmentProgram._Current = NULL;
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
    }
 
    if (ctx->FragmentProgram._Current != prevFP && ctx->Driver.BindProgram) {
@@ -1013,29 +1017,33 @@ update_program(GLcontext *ctx)
     **/
 #if 1
    /* XXX get rid of this someday? */
-   ctx->VertexProgram._TnlProgram = NULL;
+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
 #endif
    if (shProg && shProg->LinkStatus && shProg->VertexProgram) {
       /* user-defined vertex shader */
-      ctx->VertexProgram._Current = shProg->VertexProgram;
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
+                               shProg->VertexProgram);
    }
    else if (ctx->VertexProgram._Enabled) {
       /* use user-defined vertex program */
-      ctx->VertexProgram._Current = ctx->VertexProgram.Current;
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
+                               ctx->VertexProgram.Current);
    }
    else if (ctx->VertexProgram._MaintainTnlProgram) {
       /* vertex program generated from fixed-function state */
-      ctx->VertexProgram._Current = _mesa_get_fixed_func_vertex_program(ctx);
-      ctx->VertexProgram._TnlProgram = ctx->VertexProgram._Current;
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
+                               _mesa_get_fixed_func_vertex_program(ctx));
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
+                               ctx->VertexProgram._Current);
    }
    else {
       /* no vertex program / used fixed-function code */
-      ctx->VertexProgram._Current = NULL;
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
    }
 
    if (ctx->VertexProgram._Current != prevVP && ctx->Driver.BindProgram) {
       ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
-                              (struct gl_program *) ctx->VertexProgram._Current);
+                           (struct gl_program *) ctx->VertexProgram._Current);
    }
 }