1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
4 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 **************************************************************************/
31 * Code generate the whole fragment pipeline.
33 * The fragment pipeline consists of the following stages:
38 * - depth/stencil test (stencil TBI)
41 * This file has only the glue to assembly the fragment pipeline. The actual
42 * plumbing of converting Gallium state into LLVM IR is done elsewhere, in the
43 * lp_bld_*.[ch] files, and in a complete generic and reusable way. Here we
44 * muster the LLVM JIT execution engine to create a function that follows an
45 * established binary interface and that can be called from C directly.
47 * A big source of complexity here is that we often want to run different
48 * stages with different precisions and data types and precisions. For example,
49 * the fragment shader needs typically to be done in floats, but the
50 * depth/stencil test and blending is better done in the type that most closely
51 * matches the depth/stencil and color buffer respectively.
53 * Since the width of a SIMD vector register stays the same regardless of the
54 * element type, different types imply different number of elements, so we must
55 * code generate more instances of the stages with larger types to be able to
56 * feed/consume the stages with smaller types.
58 * @author Jose Fonseca <jfonseca@vmware.com>
61 #include "pipe/p_defines.h"
62 #include "util/u_memory.h"
63 #include "util/u_format.h"
64 #include "util/u_debug_dump.h"
65 #include "pipe/internal/p_winsys_screen.h"
66 #include "pipe/p_shader_tokens.h"
67 #include "draw/draw_context.h"
68 #include "tgsi/tgsi_dump.h"
69 #include "tgsi/tgsi_scan.h"
70 #include "tgsi/tgsi_parse.h"
71 #include "lp_bld_type.h"
72 #include "lp_bld_const.h"
73 #include "lp_bld_conv.h"
74 #include "lp_bld_intr.h"
75 #include "lp_bld_logic.h"
76 #include "lp_bld_depth.h"
77 #include "lp_bld_interp.h"
78 #include "lp_bld_tgsi.h"
79 #include "lp_bld_alpha.h"
80 #include "lp_bld_blend.h"
81 #include "lp_bld_swizzle.h"
82 #include "lp_bld_flow.h"
83 #include "lp_bld_debug.h"
84 #include "lp_screen.h"
85 #include "lp_context.h"
88 #include "lp_tex_sample.h"
91 static const unsigned char quad_offset_x
[4] = {0, 1, 0, 1};
92 static const unsigned char quad_offset_y
[4] = {0, 0, 1, 1};
96 * Derive from the quad's upper left scalar coordinates the coordinates for
97 * all other quad pixels
100 generate_pos0(LLVMBuilderRef builder
,
106 LLVMTypeRef int_elem_type
= LLVMInt32Type();
107 LLVMTypeRef int_vec_type
= LLVMVectorType(int_elem_type
, QUAD_SIZE
);
108 LLVMTypeRef elem_type
= LLVMFloatType();
109 LLVMTypeRef vec_type
= LLVMVectorType(elem_type
, QUAD_SIZE
);
110 LLVMValueRef x_offsets
[QUAD_SIZE
];
111 LLVMValueRef y_offsets
[QUAD_SIZE
];
114 x
= lp_build_broadcast(builder
, int_vec_type
, x
);
115 y
= lp_build_broadcast(builder
, int_vec_type
, y
);
117 for(i
= 0; i
< QUAD_SIZE
; ++i
) {
118 x_offsets
[i
] = LLVMConstInt(int_elem_type
, quad_offset_x
[i
], 0);
119 y_offsets
[i
] = LLVMConstInt(int_elem_type
, quad_offset_y
[i
], 0);
122 x
= LLVMBuildAdd(builder
, x
, LLVMConstVector(x_offsets
, QUAD_SIZE
), "");
123 y
= LLVMBuildAdd(builder
, y
, LLVMConstVector(y_offsets
, QUAD_SIZE
), "");
125 *x0
= LLVMBuildSIToFP(builder
, x
, vec_type
, "");
126 *y0
= LLVMBuildSIToFP(builder
, y
, vec_type
, "");
131 * Generate the depth test.
134 generate_depth(LLVMBuilderRef builder
,
135 const struct lp_fragment_shader_variant_key
*key
,
136 struct lp_type src_type
,
137 struct lp_build_mask_context
*mask
,
139 LLVMValueRef dst_ptr
)
141 const struct util_format_description
*format_desc
;
142 struct lp_type dst_type
;
144 if(!key
->depth
.enabled
)
147 format_desc
= util_format_description(key
->zsbuf_format
);
150 /* Pick the depth type. */
151 dst_type
= lp_depth_type(format_desc
, src_type
.width
*src_type
.length
);
153 /* FIXME: Cope with a depth test type with a different bit width. */
154 assert(dst_type
.width
== src_type
.width
);
155 assert(dst_type
.length
== src_type
.length
);
158 src
= lp_build_clamped_float_to_unsigned_norm(builder
,
163 lp_build_conv(builder
, src_type
, dst_type
, &src
, 1, &src
, 1);
166 lp_build_depth_test(builder
,
177 * Generate the fragment shader, depth/stencil test, and alpha tests.
180 generate_fs(struct llvmpipe_context
*lp
,
181 struct lp_fragment_shader
*shader
,
182 const struct lp_fragment_shader_variant_key
*key
,
183 LLVMBuilderRef builder
,
185 LLVMValueRef context_ptr
,
187 const struct lp_build_interp_soa_context
*interp
,
188 struct lp_build_sampler_soa
*sampler
,
191 LLVMValueRef depth_ptr
)
193 const struct tgsi_token
*tokens
= shader
->base
.tokens
;
194 LLVMTypeRef elem_type
;
195 LLVMTypeRef vec_type
;
196 LLVMTypeRef int_vec_type
;
197 LLVMValueRef consts_ptr
;
198 LLVMValueRef outputs
[PIPE_MAX_SHADER_OUTPUTS
][NUM_CHANNELS
];
199 LLVMValueRef z
= interp
->pos
[2];
200 struct lp_build_flow_context
*flow
;
201 struct lp_build_mask_context mask
;
202 boolean early_depth_test
;
206 elem_type
= lp_build_elem_type(type
);
207 vec_type
= lp_build_vec_type(type
);
208 int_vec_type
= lp_build_int_vec_type(type
);
210 consts_ptr
= lp_jit_context_constants(builder
, context_ptr
);
212 flow
= lp_build_flow_create(builder
);
214 memset(outputs
, 0, sizeof outputs
);
216 lp_build_flow_scope_begin(flow
);
218 /* Declare the color and z variables */
219 for(chan
= 0; chan
< NUM_CHANNELS
; ++chan
) {
220 color
[chan
] = LLVMGetUndef(vec_type
);
221 lp_build_flow_scope_declare(flow
, &color
[chan
]);
223 lp_build_flow_scope_declare(flow
, &z
);
225 lp_build_mask_begin(&mask
, flow
, type
, *pmask
);
228 key
->depth
.enabled
&&
229 !key
->alpha
.enabled
&&
230 !shader
->info
.uses_kill
&&
231 !shader
->info
.writes_z
;
234 generate_depth(builder
, key
,
238 lp_build_tgsi_soa(builder
, tokens
, type
, &mask
,
239 consts_ptr
, interp
->pos
, interp
->inputs
,
242 for (attrib
= 0; attrib
< shader
->info
.num_outputs
; ++attrib
) {
243 for(chan
= 0; chan
< NUM_CHANNELS
; ++chan
) {
244 if(outputs
[attrib
][chan
]) {
245 lp_build_name(outputs
[attrib
][chan
], "output%u.%u.%c", i
, attrib
, "xyzw"[chan
]);
247 switch (shader
->info
.output_semantic_name
[attrib
]) {
248 case TGSI_SEMANTIC_COLOR
:
250 unsigned cbuf
= shader
->info
.output_semantic_index
[attrib
];
252 lp_build_name(outputs
[attrib
][chan
], "color%u.%u.%c", i
, attrib
, "rgba"[chan
]);
255 /* XXX: should the alpha reference value be passed separately? */
256 if(cbuf
== 0 && chan
== 3) {
257 LLVMValueRef alpha
= outputs
[attrib
][chan
];
258 LLVMValueRef alpha_ref_value
;
259 alpha_ref_value
= lp_jit_context_alpha_ref_value(builder
, context_ptr
);
260 alpha_ref_value
= lp_build_broadcast(builder
, vec_type
, alpha_ref_value
);
261 lp_build_alpha_test(builder
, &key
->alpha
, type
,
262 &mask
, alpha
, alpha_ref_value
);
266 color
[chan
] = outputs
[attrib
][chan
];
271 case TGSI_SEMANTIC_POSITION
:
273 z
= outputs
[attrib
][chan
];
280 if(!early_depth_test
)
281 generate_depth(builder
, key
,
285 lp_build_mask_end(&mask
);
287 lp_build_flow_scope_end(flow
);
289 lp_build_flow_destroy(flow
);
297 * Generate color blending and color output.
300 generate_blend(const struct pipe_blend_state
*blend
,
301 LLVMBuilderRef builder
,
303 LLVMValueRef context_ptr
,
306 LLVMValueRef dst_ptr
)
308 struct lp_build_context bld
;
309 struct lp_build_flow_context
*flow
;
310 struct lp_build_mask_context mask_ctx
;
311 LLVMTypeRef vec_type
;
312 LLVMTypeRef int_vec_type
;
313 LLVMValueRef const_ptr
;
319 lp_build_context_init(&bld
, builder
, type
);
321 flow
= lp_build_flow_create(builder
);
322 lp_build_mask_begin(&mask_ctx
, flow
, type
, mask
);
324 vec_type
= lp_build_vec_type(type
);
325 int_vec_type
= lp_build_int_vec_type(type
);
327 const_ptr
= lp_jit_context_blend_color(builder
, context_ptr
);
328 const_ptr
= LLVMBuildBitCast(builder
, const_ptr
,
329 LLVMPointerType(vec_type
, 0), "");
331 for(chan
= 0; chan
< 4; ++chan
) {
332 LLVMValueRef index
= LLVMConstInt(LLVMInt32Type(), chan
, 0);
333 con
[chan
] = LLVMBuildLoad(builder
, LLVMBuildGEP(builder
, const_ptr
, &index
, 1, ""), "");
335 dst
[chan
] = LLVMBuildLoad(builder
, LLVMBuildGEP(builder
, dst_ptr
, &index
, 1, ""), "");
337 lp_build_name(con
[chan
], "con.%c", "rgba"[chan
]);
338 lp_build_name(dst
[chan
], "dst.%c", "rgba"[chan
]);
341 lp_build_blend_soa(builder
, blend
, type
, src
, dst
, con
, res
);
343 for(chan
= 0; chan
< 4; ++chan
) {
344 if(blend
->colormask
& (1 << chan
)) {
345 LLVMValueRef index
= LLVMConstInt(LLVMInt32Type(), chan
, 0);
346 lp_build_name(res
[chan
], "res.%c", "rgba"[chan
]);
347 res
[chan
] = lp_build_select(&bld
, mask
, res
[chan
], dst
[chan
]);
348 LLVMBuildStore(builder
, res
[chan
], LLVMBuildGEP(builder
, dst_ptr
, &index
, 1, ""));
352 lp_build_mask_end(&mask_ctx
);
353 lp_build_flow_destroy(flow
);
358 * Generate the runtime callable function for the whole fragment pipeline.
360 static struct lp_fragment_shader_variant
*
361 generate_fragment(struct llvmpipe_context
*lp
,
362 struct lp_fragment_shader
*shader
,
363 const struct lp_fragment_shader_variant_key
*key
)
365 struct llvmpipe_screen
*screen
= llvmpipe_screen(lp
->pipe
.screen
);
366 struct lp_fragment_shader_variant
*variant
;
367 struct lp_type fs_type
;
368 struct lp_type blend_type
;
369 LLVMTypeRef fs_elem_type
;
370 LLVMTypeRef fs_vec_type
;
371 LLVMTypeRef fs_int_vec_type
;
372 LLVMTypeRef blend_vec_type
;
373 LLVMTypeRef blend_int_vec_type
;
374 LLVMTypeRef arg_types
[9];
375 LLVMTypeRef func_type
;
376 LLVMValueRef context_ptr
;
380 LLVMValueRef dadx_ptr
;
381 LLVMValueRef dady_ptr
;
382 LLVMValueRef mask_ptr
;
383 LLVMValueRef color_ptr
;
384 LLVMValueRef depth_ptr
;
385 LLVMBasicBlockRef block
;
386 LLVMBuilderRef builder
;
389 struct lp_build_sampler_soa
*sampler
;
390 struct lp_build_interp_soa_context interp
;
391 LLVMValueRef fs_mask
[LP_MAX_VECTOR_LENGTH
];
392 LLVMValueRef fs_out_color
[NUM_CHANNELS
][LP_MAX_VECTOR_LENGTH
];
393 LLVMValueRef blend_mask
;
394 LLVMValueRef blend_in_color
[NUM_CHANNELS
];
400 tgsi_dump(shader
->base
.tokens
, 0);
401 if(key
->depth
.enabled
) {
402 debug_printf("depth.func = %s\n", debug_dump_func(key
->depth
.func
, TRUE
));
403 debug_printf("depth.writemask = %u\n", key
->depth
.writemask
);
404 debug_printf("depth.occlusion_count = %u\n", key
->depth
.occlusion_count
);
406 if(key
->alpha
.enabled
) {
407 debug_printf("alpha.func = %s\n", debug_dump_func(key
->alpha
.func
, TRUE
));
408 debug_printf("alpha.ref_value = %f\n", key
->alpha
.ref_value
);
410 if(key
->blend
.logicop_enable
) {
411 debug_printf("blend.logicop_func = %u\n", key
->blend
.logicop_func
);
413 else if(key
->blend
.blend_enable
) {
414 debug_printf("blend.rgb_func = %s\n", debug_dump_blend_func (key
->blend
.rgb_func
, TRUE
));
415 debug_printf("rgb_src_factor = %s\n", debug_dump_blend_factor(key
->blend
.rgb_src_factor
, TRUE
));
416 debug_printf("rgb_dst_factor = %s\n", debug_dump_blend_factor(key
->blend
.rgb_dst_factor
, TRUE
));
417 debug_printf("alpha_func = %s\n", debug_dump_blend_func (key
->blend
.alpha_func
, TRUE
));
418 debug_printf("alpha_src_factor = %s\n", debug_dump_blend_factor(key
->blend
.alpha_src_factor
, TRUE
));
419 debug_printf("alpha_dst_factor = %s\n", debug_dump_blend_factor(key
->blend
.alpha_dst_factor
, TRUE
));
421 debug_printf("blend.colormask = 0x%x\n", key
->blend
.colormask
);
424 variant
= CALLOC_STRUCT(lp_fragment_shader_variant
);
428 variant
->shader
= shader
;
429 memcpy(&variant
->key
, key
, sizeof *key
);
431 /* TODO: actually pick these based on the fs and color buffer
432 * characteristics. */
434 memset(&fs_type
, 0, sizeof fs_type
);
435 fs_type
.floating
= TRUE
; /* floating point values */
436 fs_type
.sign
= TRUE
; /* values are signed */
437 fs_type
.norm
= FALSE
; /* values are not limited to [0,1] or [-1,1] */
438 fs_type
.width
= 32; /* 32-bit float */
439 fs_type
.length
= 4; /* 4 element per vector */
442 memset(&blend_type
, 0, sizeof blend_type
);
443 blend_type
.floating
= FALSE
; /* values are integers */
444 blend_type
.sign
= FALSE
; /* values are unsigned */
445 blend_type
.norm
= TRUE
; /* values are in [0,1] or [-1,1] */
446 blend_type
.width
= 8; /* 8-bit ubyte values */
447 blend_type
.length
= 16; /* 16 elements per vector */
450 * Generate the function prototype. Any change here must be reflected in
451 * lp_jit.h's lp_jit_frag_func function pointer type, and vice-versa.
454 fs_elem_type
= lp_build_elem_type(fs_type
);
455 fs_vec_type
= lp_build_vec_type(fs_type
);
456 fs_int_vec_type
= lp_build_int_vec_type(fs_type
);
458 blend_vec_type
= lp_build_vec_type(blend_type
);
459 blend_int_vec_type
= lp_build_int_vec_type(blend_type
);
461 arg_types
[0] = screen
->context_ptr_type
; /* context */
462 arg_types
[1] = LLVMInt32Type(); /* x */
463 arg_types
[2] = LLVMInt32Type(); /* y */
464 arg_types
[3] = LLVMPointerType(fs_elem_type
, 0); /* a0 */
465 arg_types
[4] = LLVMPointerType(fs_elem_type
, 0); /* dadx */
466 arg_types
[5] = LLVMPointerType(fs_elem_type
, 0); /* dady */
467 arg_types
[6] = LLVMPointerType(fs_int_vec_type
, 0); /* mask */
468 arg_types
[7] = LLVMPointerType(blend_vec_type
, 0); /* color */
469 arg_types
[8] = LLVMPointerType(fs_int_vec_type
, 0); /* depth */
471 func_type
= LLVMFunctionType(LLVMVoidType(), arg_types
, Elements(arg_types
), 0);
473 variant
->function
= LLVMAddFunction(screen
->module
, "shader", func_type
);
474 LLVMSetFunctionCallConv(variant
->function
, LLVMCCallConv
);
475 for(i
= 0; i
< Elements(arg_types
); ++i
)
476 if(LLVMGetTypeKind(arg_types
[i
]) == LLVMPointerTypeKind
)
477 LLVMAddAttribute(LLVMGetParam(variant
->function
, i
), LLVMNoAliasAttribute
);
479 context_ptr
= LLVMGetParam(variant
->function
, 0);
480 x
= LLVMGetParam(variant
->function
, 1);
481 y
= LLVMGetParam(variant
->function
, 2);
482 a0_ptr
= LLVMGetParam(variant
->function
, 3);
483 dadx_ptr
= LLVMGetParam(variant
->function
, 4);
484 dady_ptr
= LLVMGetParam(variant
->function
, 5);
485 mask_ptr
= LLVMGetParam(variant
->function
, 6);
486 color_ptr
= LLVMGetParam(variant
->function
, 7);
487 depth_ptr
= LLVMGetParam(variant
->function
, 8);
489 lp_build_name(context_ptr
, "context");
490 lp_build_name(x
, "x");
491 lp_build_name(y
, "y");
492 lp_build_name(a0_ptr
, "a0");
493 lp_build_name(dadx_ptr
, "dadx");
494 lp_build_name(dady_ptr
, "dady");
495 lp_build_name(mask_ptr
, "mask");
496 lp_build_name(color_ptr
, "color");
497 lp_build_name(depth_ptr
, "depth");
503 block
= LLVMAppendBasicBlock(variant
->function
, "entry");
504 builder
= LLVMCreateBuilder();
505 LLVMPositionBuilderAtEnd(builder
, block
);
507 generate_pos0(builder
, x
, y
, &x0
, &y0
);
509 lp_build_interp_soa_init(&interp
, shader
->base
.tokens
, builder
, fs_type
,
510 a0_ptr
, dadx_ptr
, dady_ptr
,
514 /* C texture sampling */
515 sampler
= lp_c_sampler_soa_create(context_ptr
);
517 /* code generated texture sampling */
518 sampler
= lp_llvm_sampler_soa_create(key
->sampler
, context_ptr
);
521 for(i
= 0; i
< num_fs
; ++i
) {
522 LLVMValueRef index
= LLVMConstInt(LLVMInt32Type(), i
, 0);
523 LLVMValueRef out_color
[NUM_CHANNELS
];
524 LLVMValueRef depth_ptr_i
;
527 lp_build_interp_soa_update(&interp
);
529 fs_mask
[i
] = LLVMBuildLoad(builder
, LLVMBuildGEP(builder
, mask_ptr
, &index
, 1, ""), "");
530 depth_ptr_i
= LLVMBuildGEP(builder
, depth_ptr
, &index
, 1, "");
532 generate_fs(lp
, shader
, key
,
543 for(chan
= 0; chan
< NUM_CHANNELS
; ++chan
)
544 fs_out_color
[chan
][i
] = out_color
[chan
];
547 sampler
->destroy(sampler
);
550 * Convert the fs's output color and mask to fit to the blending type.
553 for(chan
= 0; chan
< NUM_CHANNELS
; ++chan
) {
554 lp_build_conv(builder
, fs_type
, blend_type
,
555 fs_out_color
[chan
], num_fs
,
556 &blend_in_color
[chan
], 1);
557 lp_build_name(blend_in_color
[chan
], "color.%c", "rgba"[chan
]);
561 lp_build_conv_mask(builder
, fs_type
, blend_type
,
569 generate_blend(&key
->blend
,
577 LLVMBuildRetVoid(builder
);
579 LLVMDisposeBuilder(builder
);
582 * Translate the LLVM IR into machine code.
585 LLVMRunFunctionPassManager(screen
->pass
, variant
->function
);
588 LLVMDumpValue(variant
->function
);
592 if(LLVMVerifyFunction(variant
->function
, LLVMPrintMessageAction
)) {
593 LLVMDumpValue(variant
->function
);
597 variant
->jit_function
= (lp_jit_frag_func
)LLVMGetPointerToGlobal(screen
->engine
, variant
->function
);
600 lp_disassemble(variant
->jit_function
);
603 variant
->next
= shader
->variants
;
604 shader
->variants
= variant
;
611 llvmpipe_create_fs_state(struct pipe_context
*pipe
,
612 const struct pipe_shader_state
*templ
)
614 struct lp_fragment_shader
*shader
;
616 shader
= CALLOC_STRUCT(lp_fragment_shader
);
620 /* get/save the summary info for this shader */
621 tgsi_scan_shader(templ
->tokens
, &shader
->info
);
623 /* we need to keep a local copy of the tokens */
624 shader
->base
.tokens
= tgsi_dup_tokens(templ
->tokens
);
631 llvmpipe_bind_fs_state(struct pipe_context
*pipe
, void *fs
)
633 struct llvmpipe_context
*llvmpipe
= llvmpipe_context(pipe
);
635 llvmpipe
->fs
= (struct lp_fragment_shader
*) fs
;
637 llvmpipe
->dirty
|= LP_NEW_FS
;
642 llvmpipe_delete_fs_state(struct pipe_context
*pipe
, void *fs
)
644 struct llvmpipe_context
*llvmpipe
= llvmpipe_context(pipe
);
645 struct llvmpipe_screen
*screen
= llvmpipe_screen(pipe
->screen
);
646 struct lp_fragment_shader
*shader
= fs
;
647 struct lp_fragment_shader_variant
*variant
;
649 assert(fs
!= llvmpipe
->fs
);
651 variant
= shader
->variants
;
653 struct lp_fragment_shader_variant
*next
= variant
->next
;
655 if(variant
->function
) {
656 if(variant
->jit_function
)
657 LLVMFreeMachineCodeForFunction(screen
->engine
, variant
->function
);
658 LLVMDeleteFunction(variant
->function
);
666 FREE((void *) shader
->base
.tokens
);
673 llvmpipe_set_constant_buffer(struct pipe_context
*pipe
,
674 uint shader
, uint index
,
675 const struct pipe_constant_buffer
*buf
)
677 struct llvmpipe_context
*llvmpipe
= llvmpipe_context(pipe
);
679 assert(shader
< PIPE_SHADER_TYPES
);
682 /* note: reference counting */
683 pipe_buffer_reference(&llvmpipe
->constants
[shader
].buffer
,
684 buf
? buf
->buffer
: NULL
);
686 llvmpipe
->dirty
|= LP_NEW_CONSTANTS
;
691 * We need to generate several variants of the fragment pipeline to match
692 * all the combinations of the contributing state atoms.
694 * TODO: there is actually no reason to tie this to context state -- the
695 * generated code could be cached globally in the screen.
698 make_variant_key(struct llvmpipe_context
*lp
,
699 struct lp_fragment_shader
*shader
,
700 struct lp_fragment_shader_variant_key
*key
)
704 memset(key
, 0, sizeof *key
);
706 if(lp
->framebuffer
.zsbuf
&&
707 lp
->depth_stencil
->depth
.enabled
) {
708 key
->zsbuf_format
= lp
->framebuffer
.zsbuf
->format
;
709 memcpy(&key
->depth
, &lp
->depth_stencil
->depth
, sizeof key
->depth
);
712 key
->alpha
.enabled
= lp
->depth_stencil
->alpha
.enabled
;
713 if(key
->alpha
.enabled
)
714 key
->alpha
.func
= lp
->depth_stencil
->alpha
.func
;
715 /* alpha.ref_value is passed in jit_context */
717 if(lp
->framebuffer
.cbufs
[0]) {
718 const struct util_format_description
*format_desc
;
721 memcpy(&key
->blend
, lp
->blend
, sizeof key
->blend
);
723 format_desc
= util_format_description(lp
->framebuffer
.cbufs
[0]->format
);
724 assert(format_desc
->layout
== UTIL_FORMAT_COLORSPACE_RGB
||
725 format_desc
->layout
== UTIL_FORMAT_COLORSPACE_SRGB
);
727 /* mask out color channels not present in the color buffer */
728 for(chan
= 0; chan
< 4; ++chan
) {
729 enum util_format_swizzle swizzle
= format_desc
->swizzle
[chan
];
731 key
->blend
.colormask
&= ~(1 << chan
);
735 for(i
= 0; i
< PIPE_MAX_SAMPLERS
; ++i
)
736 if(shader
->info
.file_mask
[TGSI_FILE_SAMPLER
] & (1 << i
))
737 lp_sampler_static_state(&key
->sampler
[i
], lp
->texture
[i
], lp
->sampler
[i
]);
742 llvmpipe_update_fs(struct llvmpipe_context
*lp
)
744 struct lp_fragment_shader
*shader
= lp
->fs
;
745 struct lp_fragment_shader_variant_key key
;
746 struct lp_fragment_shader_variant
*variant
;
748 make_variant_key(lp
, shader
, &key
);
750 variant
= shader
->variants
;
752 if(memcmp(&variant
->key
, &key
, sizeof key
) == 0)
755 variant
= variant
->next
;
759 variant
= generate_fragment(lp
, shader
, &key
);
761 shader
->current
= variant
;