2 Copyright (C) Intel Corp. 2006. All Rights Reserved.
3 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
4 develop this 3D driver.
6 Permission is hereby granted, free of charge, to any person obtaining
7 a copy of this software and associated documentation files (the
8 "Software"), to deal in the Software without restriction, including
9 without limitation the rights to use, copy, modify, merge, publish,
10 distribute, sublicense, and/or sell copies of the Software, and to
11 permit persons to whom the Software is furnished to do so, subject to
12 the following conditions:
14 The above copyright notice and this permission notice (including the
15 next paragraph) shall be included in all copies or substantial
16 portions of the Software.
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **********************************************************************/
29 * Keith Whitwell <keith@tungstengraphics.com>
37 #include "shader/prog_instruction.h"
38 #include "brw_context.h"
41 /* A big lookup table is used to figure out which and how many
42 * additional regs will inserted before the main payload in the WM
43 * program execution. These mainly relate to depth and stencil
44 * processing and the early-depth-test optimization.
46 #define IZ_PS_KILL_ALPHATEST_BIT 0x1
47 #define IZ_PS_COMPUTES_DEPTH_BIT 0x2
48 #define IZ_DEPTH_WRITE_ENABLE_BIT 0x4
49 #define IZ_DEPTH_TEST_ENABLE_BIT 0x8
50 #define IZ_STENCIL_WRITE_ENABLE_BIT 0x10
51 #define IZ_STENCIL_TEST_ENABLE_BIT 0x20
52 #define IZ_BIT_MAX 0x40
55 #define AA_SOMETIMES 1
58 struct brw_wm_prog_key {
59 GLuint source_depth_reg:3;
60 GLuint aa_dest_stencil_reg:3;
61 GLuint dest_depth_reg:3;
62 GLuint nr_depth_regs:3;
63 GLuint computes_depth:1; /* could be derived from program string */
64 GLuint source_depth_to_render_target:1;
66 GLuint runtime_check_aads_emit:1;
68 GLbitfield proj_attrib_mask; /**< one bit per fragment program attribute */
69 GLuint shadowtex_mask:16;
70 GLuint yuvtex_mask:16;
71 GLuint yuvtex_swap_mask:16; /* UV swaped */
73 GLuint tex_swizzles[BRW_MAX_TEX_UNIT];
75 GLuint program_string_id:32;
76 GLuint origin_x, origin_y;
77 GLuint drawable_height;
78 GLuint vp_outputs_written;
82 /* A bit of a glossary:
84 * brw_wm_value: A computed value or program input. Values are
85 * constant, they are created once and are never modified. When a
86 * fragment program register is written or overwritten, new values are
87 * created fresh, preserving the rule that values are constant.
89 * brw_wm_ref: A reference to a value. Wherever a value used is by an
90 * instruction or as a program output, that is tracked with an
91 * instance of this struct. All references to a value occur after it
92 * is created. After the last reference, a value is dead and can be
95 * brw_wm_grf: Represents a physical hardware register. May be either
96 * empty or hold a value. Register allocation is the process of
97 * assigning values to grf registers. This occurs in pass2 and the
98 * brw_wm_grf struct is not used before that.
100 * Fragment program registers: These are time-varying constructs that
101 * are hard to reason about and which we translate away in pass0. A
102 * single fragment program register element (eg. temp[0].x) will be
103 * translated to one or more brw_wm_value structs, one for each time
104 * that temp[0].x is written to during the program.
109 /* Used in pass2 to track register allocation.
112 struct brw_wm_value *value;
116 struct brw_wm_value {
117 struct brw_reg hw_reg; /* emitted to this reg, may not always be there */
118 struct brw_wm_ref *lastuse;
119 struct brw_wm_grf *resident;
120 GLuint contributes_to_output:1;
121 GLuint spill_slot:16; /* if non-zero, spill immediately after calculation */
125 struct brw_reg hw_reg; /* nr filled in in pass2, everything else, pass0 */
126 struct brw_wm_value *value;
127 struct brw_wm_ref *prevuse;
128 GLuint unspill_reg:7; /* unspill to reg */
133 struct brw_wm_constref {
134 const struct brw_wm_ref *ref;
139 struct brw_wm_instruction {
140 struct brw_wm_value *dst[4];
141 struct brw_wm_ref *src[3][4];
145 GLuint tex_unit:4; /* texture unit for TEX, TXD, TXP instructions */
146 GLuint tex_idx:3; /* TEXTURE_1D,2D,3D,CUBE,RECT_INDEX source target */
147 GLuint tex_shadow:1; /* do shadow comparison? */
148 GLuint eot:1; /* End of thread indicator for FB_WRITE*/
149 GLuint target:10; /* target binding table index for FB_WRITE*/
153 #define BRW_WM_MAX_INSN (MAX_NV_FRAGMENT_PROGRAM_INSTRUCTIONS*3 + FRAG_ATTRIB_MAX + 3)
154 #define BRW_WM_MAX_GRF 128 /* hardware limit */
155 #define BRW_WM_MAX_VREG (BRW_WM_MAX_INSN * 4)
156 #define BRW_WM_MAX_REF (BRW_WM_MAX_INSN * 12)
157 #define BRW_WM_MAX_PARAM 256
158 #define BRW_WM_MAX_CONST 256
159 #define BRW_WM_MAX_KILLS MAX_NV_FRAGMENT_PROGRAM_INSTRUCTIONS
160 #define BRW_WM_MAX_SUBROUTINE 16
164 /* New opcodes to track internal operations required for WM unit.
165 * These are added early so that the registers used can be tracked,
166 * freed and reused like those of other instructions.
168 #define WM_PIXELXY (MAX_OPCODE)
169 #define WM_DELTAXY (MAX_OPCODE + 1)
170 #define WM_PIXELW (MAX_OPCODE + 2)
171 #define WM_LINTERP (MAX_OPCODE + 3)
172 #define WM_PINTERP (MAX_OPCODE + 4)
173 #define WM_CINTERP (MAX_OPCODE + 5)
174 #define WM_WPOSXY (MAX_OPCODE + 6)
175 #define WM_FB_WRITE (MAX_OPCODE + 7)
176 #define WM_FRONTFACING (MAX_OPCODE + 8)
177 #define MAX_WM_OPCODE (MAX_OPCODE + 9)
179 #define PROGRAM_PAYLOAD (PROGRAM_FILE_MAX)
180 #define PAYLOAD_DEPTH (FRAG_ATTRIB_MAX)
182 struct brw_wm_compile {
183 struct brw_compile func;
184 struct brw_wm_prog_key key;
185 struct brw_wm_prog_data prog_data;
187 struct brw_fragment_program *fp;
189 GLfloat (*env_param)[4];
196 /* Initial pass - translate fp instructions to fp instructions,
197 * simplifying and adding instructions for interpolation and
198 * framebuffer writes.
200 struct prog_instruction prog_instructions[BRW_WM_MAX_INSN];
203 GLuint fp_interp_emitted;
204 GLuint fp_fragcolor_emitted;
205 GLuint fp_deriv_emitted;
207 struct prog_src_register pixel_xy;
208 struct prog_src_register delta_xy;
209 struct prog_src_register pixel_w;
212 struct brw_wm_value vreg[BRW_WM_MAX_VREG];
215 struct brw_wm_value creg[BRW_WM_MAX_PARAM];
219 struct brw_wm_value depth[4]; /* includes r0/r1 */
220 struct brw_wm_value input_interp[FRAG_ATTRIB_MAX];
224 const struct brw_wm_ref *pass0_fp_reg[PROGRAM_PAYLOAD+1][256][4];
226 struct brw_wm_ref undef_ref;
227 struct brw_wm_value undef_value;
229 struct brw_wm_ref refs[BRW_WM_MAX_REF];
232 struct brw_wm_instruction instruction[BRW_WM_MAX_INSN];
235 struct brw_wm_constref constref[BRW_WM_MAX_CONST];
238 struct brw_wm_grf pass2_grf[BRW_WM_MAX_GRF/2];
244 /** Mapping from Mesa registers to hardware registers */
248 } wm_regs[PROGRAM_PAYLOAD+1][256][4];
250 struct brw_reg stack;
251 struct brw_reg emit_mask_reg;
252 GLuint reg_index; /**< Index of next free GRF register */
253 GLuint tmp_regs[BRW_WM_MAX_GRF];
256 GLuint subroutines[BRW_WM_MAX_SUBROUTINE];
258 /** we may need up to 3 constants per instruction (if use_const_buffer) */
266 GLuint brw_wm_nr_args( GLuint opcode );
267 GLuint brw_wm_is_scalar_result( GLuint opcode );
269 void brw_wm_pass_fp( struct brw_wm_compile *c );
270 void brw_wm_pass0( struct brw_wm_compile *c );
271 void brw_wm_pass1( struct brw_wm_compile *c );
272 void brw_wm_pass2( struct brw_wm_compile *c );
273 void brw_wm_emit( struct brw_wm_compile *c );
275 void brw_wm_print_value( struct brw_wm_compile *c,
276 struct brw_wm_value *value );
278 void brw_wm_print_ref( struct brw_wm_compile *c,
279 struct brw_wm_ref *ref );
281 void brw_wm_print_insn( struct brw_wm_compile *c,
282 struct brw_wm_instruction *inst );
284 void brw_wm_print_program( struct brw_wm_compile *c,
287 void brw_wm_lookup_iz( GLuint line_aa,
289 struct brw_wm_prog_key *key );
291 GLboolean brw_wm_is_glsl(const struct gl_fragment_program *fp);
292 void brw_wm_glsl_emit(struct brw_context *brw, struct brw_wm_compile *c);