From 04bda46739beb0dab7c8820bdbe67136470d42be Mon Sep 17 00:00:00 2001
From: Brian <brian@yutani.localnet.net>
Date: Tue, 17 Apr 2007 15:56:46 -0600
Subject: Enable texture sampling for vertex programs/shaders.

This is a bit of a hack for now because the tnl module is using the swrast
module to fetch texels.  The texture fetch/filter code should probably be
moved into the main/ module since it doesn't really depend upon other
swrast code.
---
 src/mesa/tnl/t_vb_program.c | 58 ++++++++++++++++++++++++++++++++++++---------
 1 file changed, 47 insertions(+), 11 deletions(-)

(limited to 'src/mesa/tnl')

diff --git a/src/mesa/tnl/t_vb_program.c b/src/mesa/tnl/t_vb_program.c
index 3d7ea3a06a..81e166bde5 100644
--- a/src/mesa/tnl/t_vb_program.c
+++ b/src/mesa/tnl/t_vb_program.c
@@ -25,12 +25,13 @@
 
 /**
  * \file tnl/t_vb_program.c
- * \brief Pipeline stage for executing NVIDIA vertex programs.
+ * \brief Pipeline stage for executing vertex programs.
  * \author Brian Paul,  Keith Whitwell
  */
 
 
 #include "glheader.h"
+#include "colormac.h"
 #include "context.h"
 #include "macros.h"
 #include "imports.h"
@@ -42,6 +43,32 @@
 #include "t_context.h"
 #include "t_pipeline.h"
 
+#include "swrast/s_context.h"
+#include "swrast/s_texfilter.h"
+
+/**
+ * XXX the texture sampling code in this module is a bit of a hack.
+ * The texture sampling code is in swrast, though it doesn't have any
+ * real dependencies on the rest of swrast.  It should probably be
+ * moved into main/ someday.
+ */
+
+static void
+vp_fetch_texel(GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda,
+               GLuint unit, GLfloat color[4])
+{
+   GLchan rgba[4];
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+
+   /* XXX use a float-valued TextureSample routine here!!! */
+   swrast->TextureSample[unit](ctx, ctx->Texture.Unit[unit]._Current,
+                               1, (const GLfloat (*)[4]) texcoord,
+                               &lambda, &rgba);
+   color[0] = CHAN_TO_FLOAT(rgba[0]);
+   color[1] = CHAN_TO_FLOAT(rgba[1]);
+   color[2] = CHAN_TO_FLOAT(rgba[2]);
+   color[3] = CHAN_TO_FLOAT(rgba[3]);
+}
 
 
 /**
@@ -107,6 +134,9 @@ init_machine(GLcontext *ctx, struct gl_program_machine *machine)
 
    /* init call stack */
    machine->StackDepth = 0;
+
+   machine->FetchTexelLod = vp_fetch_texel;
+   machine->FetchTexelDeriv = NULL; /* not used by vertex programs */
 }
 
 
@@ -216,19 +246,14 @@ run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage )
    GLuint outputs[VERT_RESULT_MAX], numOutputs;
    GLuint i, j;
 
-#define FORCE_PROG_EXECUTE_C 1
-#if FORCE_PROG_EXECUTE_C
    if (!program)
       return GL_TRUE;
-#else
-   if (!program || !program->IsNVProgram)
-      return GL_TRUE;
-#endif
 
    if (program->IsNVProgram) {
       _mesa_load_tracked_matrices(ctx);
    }
    else {
+      /* ARB program or vertex shader */
       _mesa_load_state_parameters(ctx, program->Base.Parameters);
    }
 
@@ -380,8 +405,8 @@ run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage )
  * Called the first time stage->run is called.  In effect, don't
  * allocate data until the first time the stage is run.
  */
-static GLboolean init_vp( GLcontext *ctx,
-			  struct tnl_pipeline_stage *stage )
+static GLboolean
+init_vp(GLcontext *ctx, struct tnl_pipeline_stage *stage)
 {
    TNLcontext *tnl = TNL_CONTEXT(ctx);
    struct vertex_buffer *VB = &(tnl->vb);
@@ -411,7 +436,8 @@ static GLboolean init_vp( GLcontext *ctx,
 /**
  * Destructor for this pipeline stage.
  */
-static void dtr( struct tnl_pipeline_stage *stage )
+static void
+dtr(struct tnl_pipeline_stage *stage)
 {
    struct vp_stage_data *store = VP_STAGE_DATA(stage);
 
@@ -432,6 +458,16 @@ static void dtr( struct tnl_pipeline_stage *stage )
 }
 
 
+static void
+validate_vp_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage)
+{
+   if (ctx->VertexProgram._Current) {
+      _swrast_update_texture_samplers(ctx);
+   }
+}
+
+
+
 /**
  * Public description of this pipeline stage.
  */
@@ -441,6 +477,6 @@ const struct tnl_pipeline_stage _tnl_vertex_program_stage =
    NULL,			/* private_data */
    init_vp,			/* create */
    dtr,				/* destroy */
-   NULL, 			/* validate */
+   validate_vp_stage, 		/* validate */
    run_vp			/* run -- initially set to ctr */
 };
-- 
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