/**
* Translate a Mesa fragment shader into a TGSI shader using extra info in
* the key.
* \return new fragment program variant
*/
static struct st_fp_variant *
st_translate_fragment_program(struct st_context *st,
struct st_fragment_program *stfp,
const struct st_fp_variant_key *key)
{
struct pipe_context *pipe = st->pipe;
struct st_fp_variant *variant = CALLOC_STRUCT(st_fp_variant);
GLboolean deleteFP = GL_FALSE;
GLuint outputMapping[FRAG_RESULT_MAX];
GLuint inputMapping[VARYING_SLOT_MAX];
GLuint interpMode[PIPE_MAX_SHADER_INPUTS]; /* XXX size? */
GLuint interpLocation[PIPE_MAX_SHADER_INPUTS];
GLuint attr;
GLbitfield64 inputsRead;
struct ureg_program *ureg;
GLboolean write_all = GL_FALSE;
ubyte input_semantic_name[PIPE_MAX_SHADER_INPUTS];
ubyte input_semantic_index[PIPE_MAX_SHADER_INPUTS];
uint fs_num_inputs = 0;
ubyte fs_output_semantic_name[PIPE_MAX_SHADER_OUTPUTS];
ubyte fs_output_semantic_index[PIPE_MAX_SHADER_OUTPUTS];
uint fs_num_outputs = 0;
if (!variant)
return NULL;
assert(!(key->bitmap && key->drawpixels));
if (key->bitmap) {
/* glBitmap drawing */
struct gl_fragment_program *fp; /* we free this temp program below */
st_make_bitmap_fragment_program(st, &stfp->Base,
&fp, &variant->bitmap_sampler);
variant->parameters = _mesa_clone_parameter_list(fp->Base.Parameters);
stfp = st_fragment_program(fp);
deleteFP = GL_TRUE;
}
else if (key->drawpixels) {
/* glDrawPixels drawing */
struct gl_fragment_program *fp; /* we free this temp program below */
if (key->drawpixels_z || key->drawpixels_stencil) {
fp = st_make_drawpix_z_stencil_program(st, key->drawpixels_z,
key->drawpixels_stencil);
}
else {
/* RGBA */
st_make_drawpix_fragment_program(st, &stfp->Base, &fp);
variant->parameters = _mesa_clone_parameter_list(fp->Base.Parameters);
deleteFP = GL_TRUE;
}
stfp = st_fragment_program(fp);
}
if (!stfp->glsl_to_tgsi)
_mesa_remove_output_reads(&stfp->Base.Base, PROGRAM_OUTPUT);
/*
* Convert Mesa program inputs to TGSI input register semantics.
*/
inputsRead = stfp->Base.Base.InputsRead;
for (attr = 0; attr < VARYING_SLOT_MAX; attr++) {
if ((inputsRead & BITFIELD64_BIT(attr)) != 0) {
const GLuint slot = fs_num_inputs++;
inputMapping[attr] = slot;
if (stfp->Base.IsCentroid & BITFIELD64_BIT(attr))
interpLocation[slot] = TGSI_INTERPOLATE_LOC_CENTROID;
else if (stfp->Base.IsSample & BITFIELD64_BIT(attr))
interpLocation[slot] = TGSI_INTERPOLATE_LOC_SAMPLE;
else
interpLocation[slot] = TGSI_INTERPOLATE_LOC_CENTER;
if (key->persample_shading)
interpLocation[slot] = TGSI_INTERPOLATE_LOC_SAMPLE;
switch (attr) {
case VARYING_SLOT_POS:
input_semantic_name[slot] = TGSI_SEMANTIC_POSITION;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
break;
case VARYING_SLOT_COL0:
input_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
input_semantic_index[slot] = 0;
interpMode[slot] = st_translate_interp(stfp->Base.InterpQualifier[attr],
TRUE);
break;
case VARYING_SLOT_COL1:
input_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
input_semantic_index[slot] = 1;
interpMode[slot] = st_translate_interp(stfp->Base.InterpQualifier[attr],
TRUE);
break;
case VARYING_SLOT_FOGC:
input_semantic_name[slot] = TGSI_SEMANTIC_FOG;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
break;
case VARYING_SLOT_FACE:
input_semantic_name[slot] = TGSI_SEMANTIC_FACE;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_CONSTANT;
break;
case VARYING_SLOT_PRIMITIVE_ID:
input_semantic_name[slot] = TGSI_SEMANTIC_PRIMID;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_CONSTANT;
break;
case VARYING_SLOT_LAYER:
input_semantic_name[slot] = TGSI_SEMANTIC_LAYER;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_CONSTANT;
break;
case VARYING_SLOT_VIEWPORT:
input_semantic_name[slot] = TGSI_SEMANTIC_VIEWPORT_INDEX;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_CONSTANT;
break;
case VARYING_SLOT_CLIP_DIST0:
input_semantic_name[slot] = TGSI_SEMANTIC_CLIPDIST;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
break;
case VARYING_SLOT_CLIP_DIST1:
input_semantic_name[slot] = TGSI_SEMANTIC_CLIPDIST;
input_semantic_index[slot] = 1;
interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
break;
/* In most cases, there is nothing special about these
* inputs, so adopt a convention to use the generic
* semantic name and the mesa VARYING_SLOT_ number as the
* index.
*
* All that is required is that the vertex shader labels
* its own outputs similarly, and that the vertex shader
* generates at least every output required by the
* fragment shader plus fixed-function hardware (such as
* BFC).
*
* However, some drivers may need us to identify the PNTC and TEXi
* varyings if, for example, their capability to replace them with
* sprite coordinates is limited.
*/
case VARYING_SLOT_PNTC:
if (st->needs_texcoord_semantic) {
input_semantic_name[slot] = TGSI_SEMANTIC_PCOORD;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
break;
}
/* fall through */
case VARYING_SLOT_TEX0:
case VARYING_SLOT_TEX1:
case VARYING_SLOT_TEX2:
case VARYING_SLOT_TEX3:
case VARYING_SLOT_TEX4:
case VARYING_SLOT_TEX5:
case VARYING_SLOT_TEX6:
case VARYING_SLOT_TEX7:
if (st->needs_texcoord_semantic) {
input_semantic_name[slot] = TGSI_SEMANTIC_TEXCOORD;
input_semantic_index[slot] = attr - VARYING_SLOT_TEX0;
interpMode[slot] =
st_translate_interp(stfp->Base.InterpQualifier[attr], FALSE);
break;
}
/* fall through */
case VARYING_SLOT_VAR0:
default:
/* Semantic indices should be zero-based because drivers may choose
* to assign a fixed slot determined by that index.
* This is useful because ARB_separate_shader_objects uses location
* qualifiers for linkage, and if the semantic index corresponds to
* these locations, linkage passes in the driver become unecessary.
*
* If needs_texcoord_semantic is true, no semantic indices will be
* consumed for the TEXi varyings, and we can base the locations of
* the user varyings on VAR0. Otherwise, we use TEX0 as base index.
*/
assert(attr >= VARYING_SLOT_TEX0);
input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
input_semantic_index[slot] = st_get_generic_varying_index(st, attr);
if (attr == VARYING_SLOT_PNTC)
interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
else
interpMode[slot] = st_translate_interp(stfp->Base.InterpQualifier[attr],
FALSE);
break;
}
}
else {
inputMapping[attr] = -1;
}
}
/*
* Semantics and mapping for outputs
*/
{
uint numColors = 0;
GLbitfield64 outputsWritten = stfp->Base.Base.OutputsWritten;
/* if z is written, emit that first */
if (outputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH)) {
fs_output_semantic_name[fs_num_outputs] = TGSI_SEMANTIC_POSITION;
fs_output_semantic_index[fs_num_outputs] = 0;
outputMapping[FRAG_RESULT_DEPTH] = fs_num_outputs;
fs_num_outputs++;
outputsWritten &= ~(1 << FRAG_RESULT_DEPTH);
}
if (outputsWritten & BITFIELD64_BIT(FRAG_RESULT_STENCIL)) {
fs_output_semantic_name[fs_num_outputs] = TGSI_SEMANTIC_STENCIL;
fs_output_semantic_index[fs_num_outputs] = 0;
outputMapping[FRAG_RESULT_STENCIL] = fs_num_outputs;
fs_num_outputs++;
outputsWritten &= ~(1 << FRAG_RESULT_STENCIL);
}
if (outputsWritten & BITFIELD64_BIT(FRAG_RESULT_SAMPLE_MASK)) {
fs_output_semantic_name[fs_num_outputs] = TGSI_SEMANTIC_SAMPLEMASK;
fs_output_semantic_index[fs_num_outputs] = 0;
outputMapping[FRAG_RESULT_SAMPLE_MASK] = fs_num_outputs;
fs_num_outputs++;
outputsWritten &= ~(1 << FRAG_RESULT_SAMPLE_MASK);
}
/* handle remaining outputs (color) */
for (attr = 0; attr < FRAG_RESULT_MAX; attr++) {
if (outputsWritten & BITFIELD64_BIT(attr)) {
switch (attr) {
case FRAG_RESULT_DEPTH:
case FRAG_RESULT_STENCIL:
case FRAG_RESULT_SAMPLE_MASK:
/* handled above */
assert(0);
break;
case FRAG_RESULT_COLOR:
write_all = GL_TRUE; /* fallthrough */
default:
assert(attr == FRAG_RESULT_COLOR ||
(FRAG_RESULT_DATA0 <= attr && attr < FRAG_RESULT_MAX));
fs_output_semantic_name[fs_num_outputs] = TGSI_SEMANTIC_COLOR;
fs_output_semantic_index[fs_num_outputs] = numColors;
outputMapping[attr] = fs_num_outputs;
numColors++;
break;
}
fs_num_outputs++;
}
}
}
ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
if (ureg == NULL) {
free(variant);
return NULL;
}
if (ST_DEBUG & DEBUG_MESA) {
_mesa_print_program(&stfp->Base.Base);
_mesa_print_program_parameters(st->ctx, &stfp->Base.Base);
debug_printf("\n");
}
if (write_all == GL_TRUE)
ureg_property(ureg, TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS, 1);
if (stfp->Base.FragDepthLayout != FRAG_DEPTH_LAYOUT_NONE) {
switch (stfp->Base.FragDepthLayout) {
case FRAG_DEPTH_LAYOUT_ANY:
ureg_property(ureg, TGSI_PROPERTY_FS_DEPTH_LAYOUT,
TGSI_FS_DEPTH_LAYOUT_ANY);
break;
case FRAG_DEPTH_LAYOUT_GREATER:
ureg_property(ureg, TGSI_PROPERTY_FS_DEPTH_LAYOUT,
TGSI_FS_DEPTH_LAYOUT_GREATER);
break;
case FRAG_DEPTH_LAYOUT_LESS:
ureg_property(ureg, TGSI_PROPERTY_FS_DEPTH_LAYOUT,
TGSI_FS_DEPTH_LAYOUT_LESS);
break;
case FRAG_DEPTH_LAYOUT_UNCHANGED:
ureg_property(ureg, TGSI_PROPERTY_FS_DEPTH_LAYOUT,
TGSI_FS_DEPTH_LAYOUT_UNCHANGED);
break;
default:
assert(0);
}
}
if (stfp->glsl_to_tgsi)
st_translate_program(st->ctx,
TGSI_PROCESSOR_FRAGMENT,
ureg,
stfp->glsl_to_tgsi,
&stfp->Base.Base,
/* inputs */
fs_num_inputs,
inputMapping,
input_semantic_name,
input_semantic_index,
interpMode,
interpLocation,
/* outputs */
fs_num_outputs,
outputMapping,
fs_output_semantic_name,
fs_output_semantic_index, FALSE,
key->clamp_color );
else
st_translate_mesa_program(st->ctx,
TGSI_PROCESSOR_FRAGMENT,
ureg,
&stfp->Base.Base,
/* inputs */
fs_num_inputs,
inputMapping,
input_semantic_name,
input_semantic_index,
interpMode,
/* outputs */
fs_num_outputs,
outputMapping,
fs_output_semantic_name,
fs_output_semantic_index, FALSE,
key->clamp_color);
variant->tgsi.tokens = ureg_get_tokens( ureg, NULL );
ureg_destroy( ureg );
if (ST_DEBUG & DEBUG_TGSI) {
tgsi_dump(variant->tgsi.tokens, 0/*TGSI_DUMP_VERBOSE*/);
debug_printf("\n");
}
/* fill in variant */
variant->driver_shader = pipe->create_fs_state(pipe, &variant->tgsi);
variant->key = *key;
if (deleteFP) {
/* Free the temporary program made above */
struct gl_fragment_program *fp = &stfp->Base;
_mesa_reference_fragprog(st->ctx, &fp, NULL);
}
return variant;
}
/**
* Translate a Mesa fragment shader into a TGSI shader using extra info in
* the key.
* \return new fragment program variant
*/
static struct st_fp_variant *
st_translate_fragment_program(struct st_context *st,
struct st_fragment_program *stfp,
const struct st_fp_variant_key *key)
{
struct pipe_context *pipe = st->pipe;
struct st_fp_variant *variant = CALLOC_STRUCT(st_fp_variant);
GLboolean deleteFP = GL_FALSE;
GLuint outputMapping[FRAG_RESULT_MAX];
GLuint inputMapping[VARYING_SLOT_MAX];
GLuint interpMode[PIPE_MAX_SHADER_INPUTS]; /* XXX size? */
GLuint attr;
GLbitfield64 inputsRead;
struct ureg_program *ureg;
GLboolean write_all = GL_FALSE;
ubyte input_semantic_name[PIPE_MAX_SHADER_INPUTS];
ubyte input_semantic_index[PIPE_MAX_SHADER_INPUTS];
GLboolean is_centroid[PIPE_MAX_SHADER_INPUTS];
uint fs_num_inputs = 0;
ubyte fs_output_semantic_name[PIPE_MAX_SHADER_OUTPUTS];
ubyte fs_output_semantic_index[PIPE_MAX_SHADER_OUTPUTS];
uint fs_num_outputs = 0;
if (!variant)
return NULL;
assert(!(key->bitmap && key->drawpixels));
if (key->bitmap) {
/* glBitmap drawing */
struct gl_fragment_program *fp; /* we free this temp program below */
st_make_bitmap_fragment_program(st, &stfp->Base,
&fp, &variant->bitmap_sampler);
variant->parameters = _mesa_clone_parameter_list(fp->Base.Parameters);
stfp = st_fragment_program(fp);
deleteFP = GL_TRUE;
}
else if (key->drawpixels) {
/* glDrawPixels drawing */
struct gl_fragment_program *fp; /* we free this temp program below */
if (key->drawpixels_z || key->drawpixels_stencil) {
fp = st_make_drawpix_z_stencil_program(st, key->drawpixels_z,
key->drawpixels_stencil);
}
else {
/* RGBA */
st_make_drawpix_fragment_program(st, &stfp->Base, &fp);
variant->parameters = _mesa_clone_parameter_list(fp->Base.Parameters);
deleteFP = GL_TRUE;
}
stfp = st_fragment_program(fp);
}
if (!stfp->glsl_to_tgsi)
_mesa_remove_output_reads(&stfp->Base.Base, PROGRAM_OUTPUT);
/*
* Convert Mesa program inputs to TGSI input register semantics.
*/
inputsRead = stfp->Base.Base.InputsRead;
for (attr = 0; attr < VARYING_SLOT_MAX; attr++) {
if ((inputsRead & BITFIELD64_BIT(attr)) != 0) {
const GLuint slot = fs_num_inputs++;
inputMapping[attr] = slot;
is_centroid[slot] = (stfp->Base.IsCentroid & BITFIELD64_BIT(attr)) != 0;
switch (attr) {
case VARYING_SLOT_POS:
input_semantic_name[slot] = TGSI_SEMANTIC_POSITION;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
break;
case VARYING_SLOT_COL0:
input_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
input_semantic_index[slot] = 0;
interpMode[slot] = st_translate_interp(stfp->Base.InterpQualifier[attr],
TRUE);
break;
case VARYING_SLOT_COL1:
input_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
input_semantic_index[slot] = 1;
interpMode[slot] = st_translate_interp(stfp->Base.InterpQualifier[attr],
TRUE);
break;
case VARYING_SLOT_FOGC:
input_semantic_name[slot] = TGSI_SEMANTIC_FOG;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
break;
case VARYING_SLOT_FACE:
input_semantic_name[slot] = TGSI_SEMANTIC_FACE;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_CONSTANT;
break;
case VARYING_SLOT_CLIP_DIST0:
input_semantic_name[slot] = TGSI_SEMANTIC_CLIPDIST;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
break;
case VARYING_SLOT_CLIP_DIST1:
input_semantic_name[slot] = TGSI_SEMANTIC_CLIPDIST;
input_semantic_index[slot] = 1;
interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
break;
/* In most cases, there is nothing special about these
* inputs, so adopt a convention to use the generic
* semantic name and the mesa VARYING_SLOT_ number as the
* index.
*
* All that is required is that the vertex shader labels
* its own outputs similarly, and that the vertex shader
* generates at least every output required by the
* fragment shader plus fixed-function hardware (such as
* BFC).
*
* There is no requirement that semantic indexes start at
* zero or be restricted to a particular range -- nobody
* should be building tables based on semantic index.
*/
case VARYING_SLOT_PNTC:
case VARYING_SLOT_TEX0:
case VARYING_SLOT_TEX1:
case VARYING_SLOT_TEX2:
case VARYING_SLOT_TEX3:
case VARYING_SLOT_TEX4:
case VARYING_SLOT_TEX5:
case VARYING_SLOT_TEX6:
case VARYING_SLOT_TEX7:
case VARYING_SLOT_VAR0:
default:
/* Actually, let's try and zero-base this just for
* readability of the generated TGSI.
*/
assert(attr >= VARYING_SLOT_TEX0);
input_semantic_index[slot] = (attr - VARYING_SLOT_TEX0);
input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
if (attr == VARYING_SLOT_PNTC)
interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
else
interpMode[slot] = st_translate_interp(stfp->Base.InterpQualifier[attr],
FALSE);
break;
}
}
else {
inputMapping[attr] = -1;
}
}
/*
* Semantics and mapping for outputs
*/
{
uint numColors = 0;
GLbitfield64 outputsWritten = stfp->Base.Base.OutputsWritten;
/* if z is written, emit that first */
if (outputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH)) {
fs_output_semantic_name[fs_num_outputs] = TGSI_SEMANTIC_POSITION;
fs_output_semantic_index[fs_num_outputs] = 0;
outputMapping[FRAG_RESULT_DEPTH] = fs_num_outputs;
fs_num_outputs++;
outputsWritten &= ~(1 << FRAG_RESULT_DEPTH);
}
if (outputsWritten & BITFIELD64_BIT(FRAG_RESULT_STENCIL)) {
fs_output_semantic_name[fs_num_outputs] = TGSI_SEMANTIC_STENCIL;
fs_output_semantic_index[fs_num_outputs] = 0;
outputMapping[FRAG_RESULT_STENCIL] = fs_num_outputs;
fs_num_outputs++;
outputsWritten &= ~(1 << FRAG_RESULT_STENCIL);
}
/* handle remaining outputs (color) */
for (attr = 0; attr < FRAG_RESULT_MAX; attr++) {
if (outputsWritten & BITFIELD64_BIT(attr)) {
switch (attr) {
case FRAG_RESULT_DEPTH:
case FRAG_RESULT_STENCIL:
/* handled above */
assert(0);
break;
case FRAG_RESULT_COLOR:
write_all = GL_TRUE; /* fallthrough */
default:
assert(attr == FRAG_RESULT_COLOR ||
(FRAG_RESULT_DATA0 <= attr && attr < FRAG_RESULT_MAX));
fs_output_semantic_name[fs_num_outputs] = TGSI_SEMANTIC_COLOR;
fs_output_semantic_index[fs_num_outputs] = numColors;
outputMapping[attr] = fs_num_outputs;
numColors++;
break;
}
fs_num_outputs++;
}
}
}
ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
if (ureg == NULL) {
free(variant);
return NULL;
}
if (ST_DEBUG & DEBUG_MESA) {
_mesa_print_program(&stfp->Base.Base);
_mesa_print_program_parameters(st->ctx, &stfp->Base.Base);
debug_printf("\n");
}
if (write_all == GL_TRUE)
ureg_property_fs_color0_writes_all_cbufs(ureg, 1);
if (stfp->Base.FragDepthLayout != FRAG_DEPTH_LAYOUT_NONE) {
switch (stfp->Base.FragDepthLayout) {
case FRAG_DEPTH_LAYOUT_ANY:
ureg_property_fs_depth_layout(ureg, TGSI_FS_DEPTH_LAYOUT_ANY);
break;
case FRAG_DEPTH_LAYOUT_GREATER:
ureg_property_fs_depth_layout(ureg, TGSI_FS_DEPTH_LAYOUT_GREATER);
break;
case FRAG_DEPTH_LAYOUT_LESS:
ureg_property_fs_depth_layout(ureg, TGSI_FS_DEPTH_LAYOUT_LESS);
break;
case FRAG_DEPTH_LAYOUT_UNCHANGED:
ureg_property_fs_depth_layout(ureg, TGSI_FS_DEPTH_LAYOUT_UNCHANGED);
break;
default:
assert(0);
}
}
if (stfp->glsl_to_tgsi)
st_translate_program(st->ctx,
TGSI_PROCESSOR_FRAGMENT,
ureg,
stfp->glsl_to_tgsi,
&stfp->Base.Base,
/* inputs */
fs_num_inputs,
inputMapping,
input_semantic_name,
input_semantic_index,
interpMode,
is_centroid,
/* outputs */
fs_num_outputs,
outputMapping,
fs_output_semantic_name,
fs_output_semantic_index, FALSE,
key->clamp_color );
else
st_translate_mesa_program(st->ctx,
TGSI_PROCESSOR_FRAGMENT,
ureg,
&stfp->Base.Base,
/* inputs */
fs_num_inputs,
inputMapping,
input_semantic_name,
input_semantic_index,
interpMode,
/* outputs */
fs_num_outputs,
outputMapping,
fs_output_semantic_name,
fs_output_semantic_index, FALSE,
key->clamp_color);
variant->tgsi.tokens = ureg_get_tokens( ureg, NULL );
ureg_destroy( ureg );
/* fill in variant */
variant->driver_shader = pipe->create_fs_state(pipe, &variant->tgsi);
variant->key = *key;
if (ST_DEBUG & DEBUG_TGSI) {
tgsi_dump( variant->tgsi.tokens, 0/*TGSI_DUMP_VERBOSE*/ );
debug_printf("\n");
}
if (deleteFP) {
/* Free the temporary program made above */
struct gl_fragment_program *fp = &stfp->Base;
_mesa_reference_fragprog(st->ctx, &fp, NULL);
}
return variant;
}