7 files changed, 130 insertions, 122 deletions

diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index 6f99e490500..32104b8158b 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -410,6 +410,8 @@ struct r300_vertex_program {
 
 	struct r300_vertex_program_key {
 		GLuint FpReads;
+		GLuint FogAttr;
+		GLuint WPosAttr;
 	} key;
 	
 	struct r300_vertex_shader_hw_code {
@@ -425,7 +427,6 @@ struct r300_vertex_program {
 
 	int pos_end;
 	int num_temporaries;	/* Number of temp vars used by program */
-	int wpos_idx;
 	int inputs[VERT_ATTRIB_MAX];
 	int outputs[VERT_RESULT_MAX];
 };
@@ -560,6 +561,11 @@ struct r300_fragment_program {
 	GLuint optimization;
 
 	struct r300_fragment_program *next;
+
+	/* attribute that we are sending the WPOS in */
+	gl_frag_attrib wpos_attr;
+	/* attribute that we are sending the fog coordinate in */
+	gl_frag_attrib fog_attr;
 };
 
 struct r300_fragment_program_cont {
diff --git a/src/mesa/drivers/dri/r300/r300_emit.c b/src/mesa/drivers/dri/r300/r300_emit.c
index c3817721dc4..707d1284edb 100644
--- a/src/mesa/drivers/dri/r300/r300_emit.c
+++ b/src/mesa/drivers/dri/r300/r300_emit.c
@@ -116,15 +116,6 @@ GLuint r300VAPOutputCntl1(GLcontext * ctx, GLuint vp_writes, GLuint fp_reads)
 		}
 	}
 
-	if (fp_reads & FRAG_BIT_WPOS) {
-		ret |= (4 << (3 * first_free_texcoord));
-		++first_free_texcoord;
-	}
-
-	if (vp_writes & (1 << VERT_RESULT_FOGC) && fp_reads & FRAG_BIT_FOGC) {
-		ret |= 4 << (3 * first_free_texcoord);
-	}
-
 	if (first_free_texcoord > 8) {
 		fprintf(stderr, "\tout of free texcoords\n");
 		_mesa_exit(-1);
diff --git a/src/mesa/drivers/dri/r300/r300_fragprog_common.c b/src/mesa/drivers/dri/r300/r300_fragprog_common.c
index b25cf24007a..e90be9b7f85 100644
--- a/src/mesa/drivers/dri/r300/r300_fragprog_common.c
+++ b/src/mesa/drivers/dri/r300/r300_fragprog_common.c
@@ -69,8 +69,10 @@ static void insert_WPOS_trailer(struct r300_fragment_program_compiler *compiler)
 {
 	GLuint InputsRead = compiler->fp->Base->InputsRead;
 
-	if (!(InputsRead & FRAG_BIT_WPOS))
+	if (!(InputsRead & FRAG_BIT_WPOS)) {
+		compiler->fp->wpos_attr = FRAG_ATTRIB_MAX;
 		return;
+	}
 
 	static gl_state_index tokens[STATE_LENGTH] = {
 		STATE_INTERNAL, STATE_R300_WINDOW_DIMENSION, 0, 0, 0
@@ -78,10 +80,23 @@ static void insert_WPOS_trailer(struct r300_fragment_program_compiler *compiler)
 	struct prog_instruction *fpi;
 	GLuint window_index;
 	int i = 0;
+
+	for (i = FRAG_ATTRIB_TEX0; i <= FRAG_ATTRIB_TEX7; ++i)
+	{
+		if (!(InputsRead & (1 << i))) {
+			InputsRead &= ~(1 << FRAG_ATTRIB_WPOS);
+			InputsRead |= 1 << i;
+			compiler->fp->Base->InputsRead = InputsRead;
+			compiler->fp->wpos_attr = i;
+			break;
+		}
+	}
+
 	GLuint tempregi = _mesa_find_free_register(compiler->program, PROGRAM_TEMPORARY);
 
 	_mesa_insert_instructions(compiler->program, 0, 3);
 	fpi = compiler->program->Instructions;
+	i = 0;
 
 	/* perspective divide */
 	fpi[i].Opcode = OPCODE_RCP;
@@ -92,7 +107,7 @@ static void insert_WPOS_trailer(struct r300_fragment_program_compiler *compiler)
 	fpi[i].DstReg.CondMask = COND_TR;
 
 	fpi[i].SrcReg[0].File = PROGRAM_INPUT;
-	fpi[i].SrcReg[0].Index = FRAG_ATTRIB_WPOS;
+	fpi[i].SrcReg[0].Index = compiler->fp->wpos_attr;
 	fpi[i].SrcReg[0].Swizzle = SWIZZLE_WWWW;
 	i++;
 
@@ -104,7 +119,7 @@ static void insert_WPOS_trailer(struct r300_fragment_program_compiler *compiler)
 	fpi[i].DstReg.CondMask = COND_TR;
 
 	fpi[i].SrcReg[0].File = PROGRAM_INPUT;
-	fpi[i].SrcReg[0].Index = FRAG_ATTRIB_WPOS;
+	fpi[i].SrcReg[0].Index = compiler->fp->wpos_attr;
 	fpi[i].SrcReg[0].Swizzle = SWIZZLE_XYZW;
 
 	fpi[i].SrcReg[1].File = PROGRAM_TEMPORARY;
@@ -147,6 +162,45 @@ static void insert_WPOS_trailer(struct r300_fragment_program_compiler *compiler)
 	}
 }
 
+static void rewriteFog(struct r300_fragment_program_compiler *compiler)
+{
+	struct r300_fragment_program *fp = compiler->fp;
+	GLuint InputsRead;
+	int i;
+
+	InputsRead = fp->Base->InputsRead;
+
+	if (!(InputsRead & FRAG_BIT_FOGC)) {
+		fp->fog_attr = FRAG_ATTRIB_MAX;
+		return;
+	}
+
+	for (i = FRAG_ATTRIB_TEX0; i <= FRAG_ATTRIB_TEX7; ++i)
+	{
+		if (!(InputsRead & (1 << i))) {
+			InputsRead &= ~(1 << FRAG_ATTRIB_FOGC);
+			InputsRead |= 1 << i;
+			fp->Base->InputsRead = InputsRead;
+			fp->fog_attr = i;
+			break;
+		}
+	}
+
+	{
+		struct prog_instruction *inst;
+
+		inst = compiler->program->Instructions;
+		while (inst->Opcode != OPCODE_END) {
+			const int src_regs = _mesa_num_inst_src_regs(inst->Opcode);
+			for (i = 0; i < src_regs; ++i) {
+				if (inst->SrcReg[i].File == PROGRAM_INPUT && inst->SrcReg[i].Index == FRAG_ATTRIB_FOGC)
+					inst->SrcReg[i].Index = fp->fog_attr;
+			}
+			++inst;
+		}
+	}
+}
+
 static GLuint build_dtm(GLuint depthmode)
 {
 	switch(depthmode) {
@@ -204,6 +258,8 @@ void r300TranslateFragmentShader(GLcontext *ctx, struct r300_fragment_program *f
 
 	insert_WPOS_trailer(&compiler);
 
+	rewriteFog(&compiler);
+
 	if (r300->radeon.radeonScreen->chip_family >= CHIP_FAMILY_RV515) {
 		struct radeon_program_transformation transformations[] = {
 			{ &r500_transform_TEX, &compiler },
diff --git a/src/mesa/drivers/dri/r300/r300_shader.c b/src/mesa/drivers/dri/r300/r300_shader.c
index 854eb5d80ae..62228a3786e 100644
--- a/src/mesa/drivers/dri/r300/r300_shader.c
+++ b/src/mesa/drivers/dri/r300/r300_shader.c
@@ -66,8 +66,7 @@ static struct gl_program *r300NewProgram(GLcontext * ctx, GLenum target,
 	case GL_VERTEX_STATE_PROGRAM_NV:
 	case GL_VERTEX_PROGRAM_ARB:
 		vp = CALLOC_STRUCT(r300_vertex_program_cont);
-		return _mesa_init_vertex_program(ctx, &vp->mesa_program,
-						 target, id);
+		return _mesa_init_vertex_program(ctx, &vp->mesa_program, target, id);
 
 	case GL_FRAGMENT_PROGRAM_NV:
 	case GL_FRAGMENT_PROGRAM_ARB:
diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index 0f3198e792d..bae2f0f3cb0 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -1519,29 +1519,6 @@ static void r300SetupRSUnit(GLcontext * ctx)
 		++fp_reg;
 	}
 
-	if (InputsRead & FRAG_BIT_WPOS) {
-		r300->hw.ri.cmd[R300_RI_INTERP_0 + tex_ip] |= R300_RS_SEL_S(0) | R300_RS_SEL_T(1) | R300_RS_SEL_R(2) | R300_RS_SEL_Q(3) | R300_RS_TEX_PTR(rs_tex_count);
-		r300->hw.rr.cmd[R300_RR_INST_0 + tex_ip] |= R300_RS_INST_TEX_ID(tex_ip) | R300_RS_INST_TEX_CN_WRITE | R300_RS_INST_TEX_ADDR(fp_reg);
-		InputsRead &= ~FRAG_BIT_WPOS;
-		rs_tex_count += 4;
-		++tex_ip;
-		++fp_reg;
-	}
-
-	if (InputsRead & FRAG_BIT_FOGC) {
-		if (R300_OUTPUTS_WRITTEN_TEST(OutputsWritten, VERT_RESULT_FOGC, _TNL_ATTRIB_FOG)) {
-			r300->hw.ri.cmd[R300_RI_INTERP_0 + tex_ip] |= R300_RS_SEL_S(0) | R300_RS_SEL_T(R300_RS_SEL_K0) | R300_RS_SEL_R(R300_RS_SEL_K0);
-			r300->hw.ri.cmd[R300_RI_INTERP_0 + tex_ip] |= R300_RS_SEL_Q(R300_RS_SEL_K1) | R300_RS_TEX_PTR(rs_tex_count);
-			r300->hw.rr.cmd[R300_RR_INST_0 + tex_ip] |= R300_RS_INST_TEX_ID(tex_ip) | R300_RS_INST_TEX_CN_WRITE | R300_RS_INST_TEX_ADDR(fp_reg);
-			InputsRead &= ~FRAG_BIT_FOGC;
-			rs_tex_count += 4;
-			++tex_ip;
-			++fp_reg;
-		} else {
-			WARN_ONCE("fragprog wants fogc, vp doesn't provide it\n");
-		}
-	}
-
 	/* Setup default color if no color or tex was set */
 	if (rs_tex_count == 0 && col_ip == 0) {
 		r300->hw.rr.cmd[R300_RR_INST_0] = R300_RS_INST_COL_ID(0) | R300_RS_INST_COL_ADDR(0);
@@ -1640,36 +1617,6 @@ static void r500SetupRSUnit(GLcontext * ctx)
 		++fp_reg;
 	}
 
-	if (InputsRead & FRAG_BIT_WPOS) {
-		r300->hw.ri.cmd[R300_RI_INTERP_0 + tex_ip] |= ((rs_tex_count + 0) << R500_RS_IP_TEX_PTR_S_SHIFT) |
-			((rs_tex_count + 1) << R500_RS_IP_TEX_PTR_T_SHIFT) |
-			((rs_tex_count + 2) << R500_RS_IP_TEX_PTR_R_SHIFT) |
-			((rs_tex_count + 3) << R500_RS_IP_TEX_PTR_Q_SHIFT);
-
-		r300->hw.rr.cmd[R300_RR_INST_0 + tex_ip] |= R500_RS_INST_TEX_ID(tex_ip) | R500_RS_INST_TEX_CN_WRITE | R500_RS_INST_TEX_ADDR(fp_reg);
-		InputsRead &= ~FRAG_BIT_WPOS;
-		rs_tex_count += 4;
-		++tex_ip;
-		++fp_reg;
-	}
-
-	if (InputsRead & FRAG_BIT_FOGC) {
-		if (R300_OUTPUTS_WRITTEN_TEST(OutputsWritten, VERT_RESULT_FOGC, _TNL_ATTRIB_FOG)) {
-			r300->hw.ri.cmd[R300_RI_INTERP_0 + tex_ip] |= (rs_tex_count << R500_RS_IP_TEX_PTR_S_SHIFT) |
-				(R500_RS_IP_PTR_K0 << R500_RS_IP_TEX_PTR_T_SHIFT) |
-				(R500_RS_IP_PTR_K0 << R500_RS_IP_TEX_PTR_R_SHIFT) |
-				(R500_RS_IP_PTR_K1 << R500_RS_IP_TEX_PTR_Q_SHIFT);
-
-			r300->hw.rr.cmd[R300_RR_INST_0 + tex_ip] |= R500_RS_INST_TEX_ID(tex_ip) | R500_RS_INST_TEX_CN_WRITE | R500_RS_INST_TEX_ADDR(fp_reg);
-			InputsRead &= ~FRAG_BIT_FOGC;
-			rs_tex_count += 4;
-			++tex_ip;
-			++fp_reg;
-		} else {
-			WARN_ONCE("fragprog wants fogc, vp doesn't provide it\n");
-		}
-	}
-
 	/* Setup default color if no color or tex was set */
 	if (rs_tex_count == 0 && col_ip == 0) {
 		r300->hw.rr.cmd[R300_RR_INST_0] = R500_RS_INST_COL_ID(0) | R500_RS_INST_COL_ADDR(0);
diff --git a/src/mesa/drivers/dri/r300/r300_swtcl.c b/src/mesa/drivers/dri/r300/r300_swtcl.c
index db4ccce6f1f..d73508d36e3 100644
--- a/src/mesa/drivers/dri/r300/r300_swtcl.c
+++ b/src/mesa/drivers/dri/r300/r300_swtcl.c
@@ -192,31 +192,23 @@ void r300ChooseSwtclVertexFormat(GLcontext *ctx, GLuint *_InputsRead,  GLuint *_
 		}
 	}
 
-	/* RS can't put fragment position on the pixel stack, so stuff it in texcoord if needed */
-	if (fp_reads & FRAG_BIT_WPOS) {
-		if (first_free_tex >= ctx->Const.MaxTextureUnits) {
-			fprintf(stderr, "\tout of free texcoords to write w pos\n");
-			_mesa_exit(-1);
-		}
+	if (rmesa->selected_fp->wpos_attr != FRAG_ATTRIB_MAX) {
+		int tex_id = rmesa->selected_fp->wpos_attr - FRAG_ATTRIB_TEX0;
 
-		InputsRead |= 1 << (VERT_ATTRIB_TEX0 + first_free_tex);
-		OutputsWritten |= 1 << (VERT_RESULT_TEX0 + first_free_tex);
-		EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F );
-		ADD_ATTR(VERT_ATTRIB_POS, R300_DATA_TYPE_FLOAT_4, SWTCL_OVM_TEX(first_free_tex), SWIZZLE_XYZW, MASK_XYZW, 0);
-		++first_free_tex;
+		VB->AttribPtr[VERT_ATTRIB_TEX0 + tex_id] = VB->AttribPtr[VERT_ATTRIB_POS];
+		RENDERINPUTS_SET(tnl->render_inputs_bitset, _TNL_ATTRIB_TEX0 + tex_id);
 	}
 
-	if (fp_reads & FRAG_BIT_FOGC) {
-		if (first_free_tex >= ctx->Const.MaxTextureUnits) {
-			fprintf(stderr, "\tout of free texcoords to write fog coordinate\n");
-			_mesa_exit(-1);
-		}
+	if (rmesa->selected_fp->fog_attr != FRAG_ATTRIB_MAX) {
+		int tex_id = rmesa->selected_fp->fog_attr - FRAG_ATTRIB_TEX0;
 
-		InputsRead |= 1 << VERT_ATTRIB_FOG;
-		OutputsWritten |= 1 << VERT_RESULT_FOGC;
-		GLuint swiz = MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, SWIZZLE_ZERO, SWIZZLE_ZERO);
-		EMIT_ATTR( _TNL_ATTRIB_FOG, EMIT_1F );
-		ADD_ATTR(VERT_ATTRIB_FOG, R300_DATA_TYPE_FLOAT_1, SWTCL_OVM_TEX(first_free_tex), swiz, MASK_XYZW, 0);
+		VB->AttribPtr[VERT_ATTRIB_TEX0 + tex_id] = VB->AttribPtr[VERT_ATTRIB_FOG];
+		RENDERINPUTS_SET(tnl->render_inputs_bitset, _TNL_ATTRIB_TEX0 + tex_id);
+	}
+
+	if (first_free_tex >= ctx->Const.MaxTextureUnits) {
+		fprintf(stderr, "\tout of free texcoords to write fog coordinate\n");
+		_mesa_exit(-1);
 	}
 
 	R300_NEWPRIM(rmesa);
@@ -497,11 +489,13 @@ void r300RenderStart(GLcontext *ctx)
 	r300ContextPtr rmesa = R300_CONTEXT( ctx );
 
 	r300ChooseRenderState(ctx);
+
+	r300UpdateShaders(rmesa);
+
 	r300PrepareVertices(ctx);
 
 	r300ValidateBuffers(ctx);
 
-	r300UpdateShaders(rmesa);
 	r300UpdateShaderStates(rmesa);
 
 	r300EmitCacheFlush(rmesa);
diff --git a/src/mesa/drivers/dri/r300/r300_vertprog.c b/src/mesa/drivers/dri/r300/r300_vertprog.c
index 0b048303508..6f9b4db40f7 100644
--- a/src/mesa/drivers/dri/r300/r300_vertprog.c
+++ b/src/mesa/drivers/dri/r300/r300_vertprog.c
@@ -1223,8 +1223,7 @@ void r300TranslateVertexShader(struct r300_vertex_program *vp)
 	}
 }
 
-static void insert_wpos(struct r300_vertex_program *vp, struct gl_program *prog,
-			GLuint temp_index)
+static void insert_wpos(struct gl_program *prog, GLuint temp_index, int tex_id)
 {
 	struct prog_instruction *vpi;
 
@@ -1248,7 +1247,7 @@ static void insert_wpos(struct r300_vertex_program *vp, struct gl_program *prog,
 	vpi->Opcode = OPCODE_MOV;
 
 	vpi->DstReg.File = PROGRAM_OUTPUT;
-	vpi->DstReg.Index = VERT_RESULT_TEX0 + vp->wpos_idx;
+	vpi->DstReg.Index = VERT_RESULT_TEX0 + tex_id;
 	vpi->DstReg.WriteMask = WRITEMASK_XYZW;
 	vpi->DstReg.CondMask = COND_TR;
 
@@ -1259,12 +1258,9 @@ static void insert_wpos(struct r300_vertex_program *vp, struct gl_program *prog,
 	++vpi;
 
 	vpi->Opcode = OPCODE_END;
-
-	prog->OutputsWritten |= 1 << (VERT_RESULT_TEX0 + vp->wpos_idx);
 }
 
-static void pos_as_texcoord(struct r300_vertex_program *vp,
-			    struct gl_program *prog)
+static void pos_as_texcoord(struct gl_program *prog, int tex_id)
 {
 	struct prog_instruction *vpi;
 	GLuint tempregi = prog->NumTemporaries;
@@ -1278,7 +1274,37 @@ static void pos_as_texcoord(struct r300_vertex_program *vp,
 		}
 	}
 
-	insert_wpos(vp, prog, tempregi);
+	insert_wpos(prog, tempregi, tex_id);
+
+	prog->OutputsWritten |= 1 << (VERT_RESULT_TEX0 + tex_id);
+}
+
+/**
+ @TODO
+  We can put X001 swizzle only if input components are directly mapped from output components.
+  For some insts we need to skip source swizzles and add: MOV OUTPUT[fog_attr].yzw, CONST[0].0001
+ */
+static void fog_as_texcoord(struct gl_program *prog, int tex_id)
+{
+	struct prog_instruction *vpi;
+	int i;
+
+	vpi = prog->Instructions;
+	while (vpi->Opcode != OPCODE_END) {
+		if (vpi->DstReg.File == PROGRAM_OUTPUT && vpi->DstReg.Index == VERT_RESULT_FOGC) {
+			vpi->DstReg.Index = VERT_RESULT_TEX0 + tex_id;
+			vpi->DstReg.WriteMask = WRITEMASK_XYZW;
+
+			for (i = 0; i < _mesa_num_inst_src_regs(vpi->Opcode); ++i) {
+				vpi->SrcReg[i].Swizzle = combineSwizzles(vpi->SrcReg[i].Swizzle, SWIZZLE_X, SWIZZLE_ZERO, SWIZZLE_ZERO, SWIZZLE_ONE);
+			}
+		}
+
+		++vpi;
+	}
+
+	prog->OutputsWritten &= ~(1 << VERT_RESULT_FOGC);
+	prog->OutputsWritten |= 1 << (VERT_RESULT_TEX0 + tex_id);
 }
 
 static int translateABS(struct gl_program *prog, int pos)
@@ -1513,16 +1539,15 @@ static void addArtificialOutputs(GLcontext *ctx, struct gl_program *prog)
 
 static struct r300_vertex_program *build_program(GLcontext *ctx,
 						 struct r300_vertex_program_key *wanted_key,
-						 const struct gl_vertex_program *mesa_vp,
-						 GLint wpos_idx)
+						 const struct gl_vertex_program *mesa_vp)
 {
+	r300ContextPtr r300 = R300_CONTEXT(ctx);
 	struct r300_vertex_program *vp;
 	struct gl_program *prog;
 
 	vp = _mesa_calloc(sizeof(*vp));
 	vp->Base = (struct gl_vertex_program *) _mesa_clone_program(ctx, &mesa_vp->Base);
 	_mesa_memcpy(&vp->key, wanted_key, sizeof(vp->key));
-	vp->wpos_idx = wpos_idx;
 
 	prog = &vp->Base->Base;
 
@@ -1532,12 +1557,16 @@ static struct r300_vertex_program *build_program(GLcontext *ctx,
 		fflush(stdout);
 	}
 
-	if (mesa_vp->IsPositionInvariant) {
+	if (vp->Base->IsPositionInvariant) {
 		_mesa_insert_mvp_code(ctx, vp->Base);
 	}
 
-	if (wpos_idx > -1) {
-		pos_as_texcoord(vp, prog);
+	if (r300->selected_fp->wpos_attr != FRAG_ATTRIB_MAX) {
+		pos_as_texcoord(&vp->Base->Base, r300->selected_fp->wpos_attr - FRAG_ATTRIB_TEX0);
+	}
+
+	if (r300->selected_fp->fog_attr != FRAG_ATTRIB_MAX) {
+		fog_as_texcoord(&vp->Base->Base, r300->selected_fp->fog_attr - FRAG_ATTRIB_TEX0);
 	}
 
 	addArtificialOutputs(ctx, prog);
@@ -1562,34 +1591,20 @@ struct r300_vertex_program * r300SelectVertexShader(GLcontext *ctx)
 	struct r300_vertex_program_key wanted_key = { 0 };
 	struct r300_vertex_program_cont *vpc;
 	struct r300_vertex_program *vp;
-	GLint wpos_idx;
 
 	vpc = (struct r300_vertex_program_cont *)ctx->VertexProgram._Current;
 	wanted_key.FpReads = r300->selected_fp->Base->InputsRead;
+	wanted_key.FogAttr = r300->selected_fp->fog_attr;
+	wanted_key.WPosAttr = r300->selected_fp->wpos_attr;
 
-	for (vp = vpc->progs; vp; vp = vp->next)
+	for (vp = vpc->progs; vp; vp = vp->next) {
 		if (_mesa_memcmp(&vp->key, &wanted_key, sizeof(wanted_key))
 		    == 0) {
 			return r300->selected_vp = vp;
 		}
-
-	wpos_idx = -1;
-	if (wanted_key.FpReads & FRAG_BIT_WPOS) {
-		GLint i;
-
-		for (i = 0; i < ctx->Const.MaxTextureUnits; i++)
-			if (!(wanted_key.FpReads & (FRAG_BIT_TEX(i))))
-				break;
-
-			if (i == ctx->Const.MaxTextureUnits) {
-				fprintf(stderr, "\tno free texcoord found\n");
-				_mesa_exit(-1);
-			}
-
-			wpos_idx = i;
 	}
 
-	vp = build_program(ctx, &wanted_key, &vpc->mesa_program, wpos_idx);
+	vp = build_program(ctx, &wanted_key, &vpc->mesa_program);
 	vp->next = vpc->progs;
 	vpc->progs = vp;