i915_state.c revision 8cf9085bc7b96819d2bec1e749e15af58eefb2f3 
1/**************************************************************************
2 *
3 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * 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, sub license, 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:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28
29#include "glheader.h"
30#include "context.h"
31#include "macros.h"
32#include "enums.h"
33#include "dd.h"
34#include "tnl/tnl.h"
35#include "tnl/t_context.h"
36
37#include "texmem.h"
38
39#include "drivers/common/driverfuncs.h"
40
41#include "intel_fbo.h"
42#include "intel_screen.h"
43#include "intel_batchbuffer.h"
44
45#include "i915_context.h"
46#include "i915_reg.h"
47
48#define FILE_DEBUG_FLAG DEBUG_STATE
49
50static void
51i915StencilFuncSeparate(GLcontext * ctx, GLenum face, GLenum func, GLint ref,
52                        GLuint mask)
53{
54   struct i915_context *i915 = I915_CONTEXT(ctx);
55   int test = intel_translate_compare_func(func);
56
57   mask = mask & 0xff;
58
59   DBG("%s : func: %s, ref : 0x%x, mask: 0x%x\n", __FUNCTION__,
60       _mesa_lookup_enum_by_nr(func), ref, mask);
61
62
63   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
64   i915->state.Ctx[I915_CTXREG_STATE4] &= ~MODE4_ENABLE_STENCIL_TEST_MASK;
65   i915->state.Ctx[I915_CTXREG_STATE4] |= (ENABLE_STENCIL_TEST_MASK |
66                                           STENCIL_TEST_MASK(mask));
67
68   i915->state.Ctx[I915_CTXREG_LIS5] &= ~(S5_STENCIL_REF_MASK |
69                                          S5_STENCIL_TEST_FUNC_MASK);
70
71   i915->state.Ctx[I915_CTXREG_LIS5] |= ((ref << S5_STENCIL_REF_SHIFT) |
72                                         (test <<
73                                          S5_STENCIL_TEST_FUNC_SHIFT));
74}
75
76static void
77i915StencilMaskSeparate(GLcontext * ctx, GLenum face, GLuint mask)
78{
79   struct i915_context *i915 = I915_CONTEXT(ctx);
80
81   DBG("%s : mask 0x%x\n", __FUNCTION__, mask);
82
83   mask = mask & 0xff;
84
85   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
86   i915->state.Ctx[I915_CTXREG_STATE4] &= ~MODE4_ENABLE_STENCIL_WRITE_MASK;
87   i915->state.Ctx[I915_CTXREG_STATE4] |= (ENABLE_STENCIL_WRITE_MASK |
88                                           STENCIL_WRITE_MASK(mask));
89}
90
91
92static void
93i915StencilOpSeparate(GLcontext * ctx, GLenum face, GLenum fail, GLenum zfail,
94                      GLenum zpass)
95{
96   struct i915_context *i915 = I915_CONTEXT(ctx);
97   int fop = intel_translate_stencil_op(fail);
98   int dfop = intel_translate_stencil_op(zfail);
99   int dpop = intel_translate_stencil_op(zpass);
100
101
102   DBG("%s: fail : %s, zfail: %s, zpass : %s\n", __FUNCTION__,
103       _mesa_lookup_enum_by_nr(fail),
104       _mesa_lookup_enum_by_nr(zfail), _mesa_lookup_enum_by_nr(zpass));
105
106   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
107
108   i915->state.Ctx[I915_CTXREG_LIS5] &= ~(S5_STENCIL_FAIL_MASK |
109                                          S5_STENCIL_PASS_Z_FAIL_MASK |
110                                          S5_STENCIL_PASS_Z_PASS_MASK);
111
112   i915->state.Ctx[I915_CTXREG_LIS5] |= ((fop << S5_STENCIL_FAIL_SHIFT) |
113                                         (dfop <<
114                                          S5_STENCIL_PASS_Z_FAIL_SHIFT) |
115                                         (dpop <<
116                                          S5_STENCIL_PASS_Z_PASS_SHIFT));
117}
118
119static void
120i915AlphaFunc(GLcontext * ctx, GLenum func, GLfloat ref)
121{
122   struct i915_context *i915 = I915_CONTEXT(ctx);
123   int test = intel_translate_compare_func(func);
124   GLubyte refByte;
125
126   UNCLAMPED_FLOAT_TO_UBYTE(refByte, ref);
127
128   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
129   i915->state.Ctx[I915_CTXREG_LIS6] &= ~(S6_ALPHA_TEST_FUNC_MASK |
130                                          S6_ALPHA_REF_MASK);
131   i915->state.Ctx[I915_CTXREG_LIS6] |= ((test << S6_ALPHA_TEST_FUNC_SHIFT) |
132                                         (((GLuint) refByte) <<
133                                          S6_ALPHA_REF_SHIFT));
134}
135
136/* This function makes sure that the proper enables are
137 * set for LogicOp, Independant Alpha Blend, and Blending.
138 * It needs to be called from numerous places where we
139 * could change the LogicOp or Independant Alpha Blend without subsequent
140 * calls to glEnable.
141 */
142static void
143i915EvalLogicOpBlendState(GLcontext * ctx)
144{
145   struct i915_context *i915 = I915_CONTEXT(ctx);
146
147   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
148
149   if (RGBA_LOGICOP_ENABLED(ctx)) {
150      i915->state.Ctx[I915_CTXREG_LIS5] |= S5_LOGICOP_ENABLE;
151      i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_CBUF_BLEND_ENABLE;
152   }
153   else {
154      i915->state.Ctx[I915_CTXREG_LIS5] &= ~S5_LOGICOP_ENABLE;
155
156      if (ctx->Color.BlendEnabled) {
157         i915->state.Ctx[I915_CTXREG_LIS6] |= S6_CBUF_BLEND_ENABLE;
158      }
159      else {
160         i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_CBUF_BLEND_ENABLE;
161      }
162   }
163}
164
165static void
166i915BlendColor(GLcontext * ctx, const GLfloat color[4])
167{
168   struct i915_context *i915 = I915_CONTEXT(ctx);
169   GLubyte r, g, b, a;
170
171   DBG("%s\n", __FUNCTION__);
172
173   UNCLAMPED_FLOAT_TO_UBYTE(r, color[RCOMP]);
174   UNCLAMPED_FLOAT_TO_UBYTE(g, color[GCOMP]);
175   UNCLAMPED_FLOAT_TO_UBYTE(b, color[BCOMP]);
176   UNCLAMPED_FLOAT_TO_UBYTE(a, color[ACOMP]);
177
178   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
179   i915->state.Ctx[I915_CTXREG_BLENDCOLOR1] =
180      (a << 24) | (r << 16) | (g << 8) | b;
181}
182
183
184#define DST_BLND_FACT(f) ((f)<<S6_CBUF_DST_BLEND_FACT_SHIFT)
185#define SRC_BLND_FACT(f) ((f)<<S6_CBUF_SRC_BLEND_FACT_SHIFT)
186#define DST_ABLND_FACT(f) ((f)<<IAB_DST_FACTOR_SHIFT)
187#define SRC_ABLND_FACT(f) ((f)<<IAB_SRC_FACTOR_SHIFT)
188
189
190
191static GLuint
192translate_blend_equation(GLenum mode)
193{
194   switch (mode) {
195   case GL_FUNC_ADD:
196      return BLENDFUNC_ADD;
197   case GL_MIN:
198      return BLENDFUNC_MIN;
199   case GL_MAX:
200      return BLENDFUNC_MAX;
201   case GL_FUNC_SUBTRACT:
202      return BLENDFUNC_SUBTRACT;
203   case GL_FUNC_REVERSE_SUBTRACT:
204      return BLENDFUNC_REVERSE_SUBTRACT;
205   default:
206      return 0;
207   }
208}
209
210static void
211i915UpdateBlendState(GLcontext * ctx)
212{
213   struct i915_context *i915 = I915_CONTEXT(ctx);
214   GLuint iab = (i915->state.Ctx[I915_CTXREG_IAB] &
215                 ~(IAB_SRC_FACTOR_MASK |
216                   IAB_DST_FACTOR_MASK |
217                   (BLENDFUNC_MASK << IAB_FUNC_SHIFT) | IAB_ENABLE));
218
219   GLuint lis6 = (i915->state.Ctx[I915_CTXREG_LIS6] &
220                  ~(S6_CBUF_SRC_BLEND_FACT_MASK |
221                    S6_CBUF_DST_BLEND_FACT_MASK | S6_CBUF_BLEND_FUNC_MASK));
222
223   GLuint eqRGB = ctx->Color.BlendEquationRGB;
224   GLuint eqA = ctx->Color.BlendEquationA;
225   GLuint srcRGB = ctx->Color.BlendSrcRGB;
226   GLuint dstRGB = ctx->Color.BlendDstRGB;
227   GLuint srcA = ctx->Color.BlendSrcA;
228   GLuint dstA = ctx->Color.BlendDstA;
229
230   if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
231      srcRGB = dstRGB = GL_ONE;
232   }
233
234   if (eqA == GL_MIN || eqA == GL_MAX) {
235      srcA = dstA = GL_ONE;
236   }
237
238   lis6 |= SRC_BLND_FACT(intel_translate_blend_factor(srcRGB));
239   lis6 |= DST_BLND_FACT(intel_translate_blend_factor(dstRGB));
240   lis6 |= translate_blend_equation(eqRGB) << S6_CBUF_BLEND_FUNC_SHIFT;
241
242   iab |= SRC_ABLND_FACT(intel_translate_blend_factor(srcA));
243   iab |= DST_ABLND_FACT(intel_translate_blend_factor(dstA));
244   iab |= translate_blend_equation(eqA) << IAB_FUNC_SHIFT;
245
246   if (srcA != srcRGB || dstA != dstRGB || eqA != eqRGB)
247      iab |= IAB_ENABLE;
248
249   if (iab != i915->state.Ctx[I915_CTXREG_IAB] ||
250       lis6 != i915->state.Ctx[I915_CTXREG_LIS6]) {
251      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
252      i915->state.Ctx[I915_CTXREG_IAB] = iab;
253      i915->state.Ctx[I915_CTXREG_LIS6] = lis6;
254   }
255
256   /* This will catch a logicop blend equation */
257   i915EvalLogicOpBlendState(ctx);
258}
259
260
261static void
262i915BlendFuncSeparate(GLcontext * ctx, GLenum srcRGB,
263                      GLenum dstRGB, GLenum srcA, GLenum dstA)
264{
265   i915UpdateBlendState(ctx);
266}
267
268
269static void
270i915BlendEquationSeparate(GLcontext * ctx, GLenum eqRGB, GLenum eqA)
271{
272   i915UpdateBlendState(ctx);
273}
274
275
276static void
277i915DepthFunc(GLcontext * ctx, GLenum func)
278{
279   struct i915_context *i915 = I915_CONTEXT(ctx);
280   int test = intel_translate_compare_func(func);
281
282   DBG("%s\n", __FUNCTION__);
283
284   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
285   i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_DEPTH_TEST_FUNC_MASK;
286   i915->state.Ctx[I915_CTXREG_LIS6] |= test << S6_DEPTH_TEST_FUNC_SHIFT;
287}
288
289static void
290i915DepthMask(GLcontext * ctx, GLboolean flag)
291{
292   struct i915_context *i915 = I915_CONTEXT(ctx);
293
294   DBG("%s flag (%d)\n", __FUNCTION__, flag);
295
296   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
297
298   if (flag && ctx->Depth.Test)
299      i915->state.Ctx[I915_CTXREG_LIS6] |= S6_DEPTH_WRITE_ENABLE;
300   else
301      i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_DEPTH_WRITE_ENABLE;
302}
303
304/* =============================================================
305 * Polygon stipple
306 *
307 * The i915 supports a 4x4 stipple natively, GL wants 32x32.
308 * Fortunately stipple is usually a repeating pattern.
309 */
310static void
311i915PolygonStipple(GLcontext * ctx, const GLubyte * mask)
312{
313   struct i915_context *i915 = I915_CONTEXT(ctx);
314   const GLubyte *m = mask;
315   GLubyte p[4];
316   int i, j, k;
317   int active = (ctx->Polygon.StippleFlag &&
318                 i915->intel.reduced_primitive == GL_TRIANGLES);
319   GLuint newMask;
320
321   if (active) {
322      I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
323      i915->state.Stipple[I915_STPREG_ST1] &= ~ST1_ENABLE;
324   }
325
326   p[0] = mask[12] & 0xf;
327   p[0] |= p[0] << 4;
328   p[1] = mask[8] & 0xf;
329   p[1] |= p[1] << 4;
330   p[2] = mask[4] & 0xf;
331   p[2] |= p[2] << 4;
332   p[3] = mask[0] & 0xf;
333   p[3] |= p[3] << 4;
334
335   for (k = 0; k < 8; k++)
336      for (j = 3; j >= 0; j--)
337         for (i = 0; i < 4; i++, m++)
338            if (*m != p[j]) {
339               i915->intel.hw_stipple = 0;
340               return;
341            }
342
343   newMask = (((p[0] & 0xf) << 0) |
344              ((p[1] & 0xf) << 4) |
345              ((p[2] & 0xf) << 8) | ((p[3] & 0xf) << 12));
346
347
348   if (newMask == 0xffff || newMask == 0x0) {
349      /* this is needed to make conform pass */
350      i915->intel.hw_stipple = 0;
351      return;
352   }
353
354   i915->state.Stipple[I915_STPREG_ST1] &= ~0xffff;
355   i915->state.Stipple[I915_STPREG_ST1] |= newMask;
356   i915->intel.hw_stipple = 1;
357
358   if (active)
359      i915->state.Stipple[I915_STPREG_ST1] |= ST1_ENABLE;
360}
361
362
363/* =============================================================
364 * Hardware clipping
365 */
366static void
367i915Scissor(GLcontext * ctx, GLint x, GLint y, GLsizei w, GLsizei h)
368{
369   struct i915_context *i915 = I915_CONTEXT(ctx);
370   int x1, y1, x2, y2;
371
372   if (!ctx->DrawBuffer)
373      return;
374
375   DBG("%s %d,%d %dx%d\n", __FUNCTION__, x, y, w, h);
376
377   if (ctx->DrawBuffer->Name == 0) {
378      x1 = x;
379      y1 = ctx->DrawBuffer->Height - (y + h);
380      x2 = x + w - 1;
381      y2 = y1 + h - 1;
382      DBG("%s %d..%d,%d..%d (inverted)\n", __FUNCTION__, x1, x2, y1, y2);
383   }
384   else {
385      /* FBO - not inverted
386       */
387      x1 = x;
388      y1 = y;
389      x2 = x + w - 1;
390      y2 = y + h - 1;
391      DBG("%s %d..%d,%d..%d (not inverted)\n", __FUNCTION__, x1, x2, y1, y2);
392   }
393
394   x1 = CLAMP(x1, 0, ctx->DrawBuffer->Width - 1);
395   y1 = CLAMP(y1, 0, ctx->DrawBuffer->Height - 1);
396   x2 = CLAMP(x2, 0, ctx->DrawBuffer->Width - 1);
397   y2 = CLAMP(y2, 0, ctx->DrawBuffer->Height - 1);
398
399   DBG("%s %d..%d,%d..%d (clamped)\n", __FUNCTION__, x1, x2, y1, y2);
400
401   I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
402   i915->state.Buffer[I915_DESTREG_SR1] = (y1 << 16) | (x1 & 0xffff);
403   i915->state.Buffer[I915_DESTREG_SR2] = (y2 << 16) | (x2 & 0xffff);
404}
405
406static void
407i915LogicOp(GLcontext * ctx, GLenum opcode)
408{
409   struct i915_context *i915 = I915_CONTEXT(ctx);
410   int tmp = intel_translate_logic_op(opcode);
411
412   DBG("%s\n", __FUNCTION__);
413
414   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
415   i915->state.Ctx[I915_CTXREG_STATE4] &= ~LOGICOP_MASK;
416   i915->state.Ctx[I915_CTXREG_STATE4] |= LOGIC_OP_FUNC(tmp);
417}
418
419
420
421static void
422i915CullFaceFrontFace(GLcontext * ctx, GLenum unused)
423{
424   struct i915_context *i915 = I915_CONTEXT(ctx);
425   GLuint mode;
426
427   DBG("%s %d\n", __FUNCTION__,
428       ctx->DrawBuffer ? ctx->DrawBuffer->Name : 0);
429
430   if (!ctx->Polygon.CullFlag) {
431      mode = S4_CULLMODE_NONE;
432   }
433   else if (ctx->Polygon.CullFaceMode != GL_FRONT_AND_BACK) {
434      mode = S4_CULLMODE_CW;
435
436      if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)
437         mode ^= (S4_CULLMODE_CW ^ S4_CULLMODE_CCW);
438      if (ctx->Polygon.CullFaceMode == GL_FRONT)
439         mode ^= (S4_CULLMODE_CW ^ S4_CULLMODE_CCW);
440      if (ctx->Polygon.FrontFace != GL_CCW)
441         mode ^= (S4_CULLMODE_CW ^ S4_CULLMODE_CCW);
442   }
443   else {
444      mode = S4_CULLMODE_BOTH;
445   }
446
447   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
448   i915->state.Ctx[I915_CTXREG_LIS4] &= ~S4_CULLMODE_MASK;
449   i915->state.Ctx[I915_CTXREG_LIS4] |= mode;
450}
451
452static void
453i915LineWidth(GLcontext * ctx, GLfloat widthf)
454{
455   struct i915_context *i915 = I915_CONTEXT(ctx);
456   int lis4 = i915->state.Ctx[I915_CTXREG_LIS4] & ~S4_LINE_WIDTH_MASK;
457   int width;
458
459   DBG("%s\n", __FUNCTION__);
460
461   width = (int) (widthf * 2);
462   CLAMP_SELF(width, 1, 0xf);
463   lis4 |= width << S4_LINE_WIDTH_SHIFT;
464
465   if (lis4 != i915->state.Ctx[I915_CTXREG_LIS4]) {
466      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
467      i915->state.Ctx[I915_CTXREG_LIS4] = lis4;
468   }
469}
470
471static void
472i915PointSize(GLcontext * ctx, GLfloat size)
473{
474   struct i915_context *i915 = I915_CONTEXT(ctx);
475   int lis4 = i915->state.Ctx[I915_CTXREG_LIS4] & ~S4_POINT_WIDTH_MASK;
476   GLint point_size = (int) size;
477
478   DBG("%s\n", __FUNCTION__);
479
480   CLAMP_SELF(point_size, 1, 255);
481   lis4 |= point_size << S4_POINT_WIDTH_SHIFT;
482
483   if (lis4 != i915->state.Ctx[I915_CTXREG_LIS4]) {
484      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
485      i915->state.Ctx[I915_CTXREG_LIS4] = lis4;
486   }
487}
488
489
490/* =============================================================
491 * Color masks
492 */
493
494static void
495i915ColorMask(GLcontext * ctx,
496              GLboolean r, GLboolean g, GLboolean b, GLboolean a)
497{
498   struct i915_context *i915 = I915_CONTEXT(ctx);
499   GLuint tmp = i915->state.Ctx[I915_CTXREG_LIS5] & ~S5_WRITEDISABLE_MASK;
500
501   DBG("%s r(%d) g(%d) b(%d) a(%d)\n", __FUNCTION__, r, g, b,
502       a);
503
504   if (!r)
505      tmp |= S5_WRITEDISABLE_RED;
506   if (!g)
507      tmp |= S5_WRITEDISABLE_GREEN;
508   if (!b)
509      tmp |= S5_WRITEDISABLE_BLUE;
510   if (!a)
511      tmp |= S5_WRITEDISABLE_ALPHA;
512
513   if (tmp != i915->state.Ctx[I915_CTXREG_LIS5]) {
514      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
515      i915->state.Ctx[I915_CTXREG_LIS5] = tmp;
516   }
517}
518
519static void
520update_specular(GLcontext * ctx)
521{
522   /* A hack to trigger the rebuild of the fragment program.
523    */
524   intel_context(ctx)->NewGLState |= _NEW_TEXTURE;
525}
526
527static void
528i915LightModelfv(GLcontext * ctx, GLenum pname, const GLfloat * param)
529{
530   DBG("%s\n", __FUNCTION__);
531
532   if (pname == GL_LIGHT_MODEL_COLOR_CONTROL) {
533      update_specular(ctx);
534   }
535}
536
537static void
538i915ShadeModel(GLcontext * ctx, GLenum mode)
539{
540   struct i915_context *i915 = I915_CONTEXT(ctx);
541   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
542
543   if (mode == GL_SMOOTH) {
544      i915->state.Ctx[I915_CTXREG_LIS4] &= ~(S4_FLATSHADE_ALPHA |
545                                             S4_FLATSHADE_COLOR |
546                                             S4_FLATSHADE_SPECULAR);
547   }
548   else {
549      i915->state.Ctx[I915_CTXREG_LIS4] |= (S4_FLATSHADE_ALPHA |
550                                            S4_FLATSHADE_COLOR |
551                                            S4_FLATSHADE_SPECULAR);
552   }
553}
554
555/* =============================================================
556 * Fog
557 */
558void
559i915_update_fog(GLcontext * ctx)
560{
561   struct i915_context *i915 = I915_CONTEXT(ctx);
562   GLenum mode;
563   GLboolean enabled;
564   GLboolean try_pixel_fog;
565
566   if (ctx->FragmentProgram._Active) {
567      /* Pull in static fog state from program */
568      mode = ctx->FragmentProgram._Current->FogOption;
569      enabled = (mode != GL_NONE);
570      try_pixel_fog = 0;
571   }
572   else {
573      enabled = ctx->Fog.Enabled;
574      mode = ctx->Fog.Mode;
575#if 0
576      /* XXX - DISABLED -- Need ortho fallback */
577      try_pixel_fog = (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT
578                       && ctx->Hint.Fog == GL_NICEST);
579#else
580      try_pixel_fog = 0;
581#endif
582   }
583
584   if (!enabled) {
585      i915->vertex_fog = I915_FOG_NONE;
586   }
587   else if (try_pixel_fog) {
588      I915_STATECHANGE(i915, I915_UPLOAD_FOG);
589      i915->state.Fog[I915_FOGREG_MODE1] &= ~FMC1_FOGFUNC_MASK;
590      i915->vertex_fog = I915_FOG_PIXEL;
591
592      switch (mode) {
593      case GL_LINEAR:
594         if (ctx->Fog.End <= ctx->Fog.Start) {
595            /* XXX - this won't work with fragment programs.  Need to
596             * either fallback or append fog instructions to end of
597             * program in the case of linear fog.
598             */
599            printf("vertex fog!\n");
600            i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_VERTEX;
601            i915->vertex_fog = I915_FOG_VERTEX;
602         }
603         else {
604            GLfloat c2 = 1.0 / (ctx->Fog.End - ctx->Fog.Start);
605            GLfloat c1 = ctx->Fog.End * c2;
606
607            i915->state.Fog[I915_FOGREG_MODE1] &= ~FMC1_C1_MASK;
608            i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_PIXEL_LINEAR;
609            i915->state.Fog[I915_FOGREG_MODE1] |=
610               ((GLuint) (c1 * FMC1_C1_ONE)) & FMC1_C1_MASK;
611
612            if (i915->state.Fog[I915_FOGREG_MODE1] & FMC1_FOGINDEX_Z) {
613               i915->state.Fog[I915_FOGREG_MODE2]
614                  = (GLuint) (c2 * FMC2_C2_ONE);
615            }
616            else {
617               fi_type fi;
618               fi.f = c2;
619               i915->state.Fog[I915_FOGREG_MODE2] = fi.i;
620            }
621         }
622         break;
623      case GL_EXP:
624         i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_PIXEL_EXP;
625         break;
626      case GL_EXP2:
627         i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_PIXEL_EXP2;
628         break;
629      default:
630         break;
631      }
632   }
633   else { /* if (i915->vertex_fog != I915_FOG_VERTEX) */
634      I915_STATECHANGE(i915, I915_UPLOAD_FOG);
635      i915->state.Fog[I915_FOGREG_MODE1] &= ~FMC1_FOGFUNC_MASK;
636      i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_VERTEX;
637      i915->vertex_fog = I915_FOG_VERTEX;
638   }
639
640   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
641   I915_ACTIVESTATE(i915, I915_UPLOAD_FOG, enabled);
642   if (enabled)
643      i915->state.Ctx[I915_CTXREG_LIS5] |= S5_FOG_ENABLE;
644   else
645      i915->state.Ctx[I915_CTXREG_LIS5] &= ~S5_FOG_ENABLE;
646
647   /* Always enable pixel fog.  Vertex fog using fog coord will conflict
648    * with fog code appended onto fragment program.
649    */
650    _tnl_allow_vertex_fog( ctx, 0 );
651    _tnl_allow_pixel_fog( ctx, 1 );
652}
653
654static void
655i915Fogfv(GLcontext * ctx, GLenum pname, const GLfloat * param)
656{
657   struct i915_context *i915 = I915_CONTEXT(ctx);
658
659   switch (pname) {
660   case GL_FOG_COORDINATE_SOURCE_EXT:
661   case GL_FOG_MODE:
662   case GL_FOG_START:
663   case GL_FOG_END:
664      break;
665
666   case GL_FOG_DENSITY:
667      I915_STATECHANGE(i915, I915_UPLOAD_FOG);
668
669      if (i915->state.Fog[I915_FOGREG_MODE1] & FMC1_FOGINDEX_Z) {
670         i915->state.Fog[I915_FOGREG_MODE3] =
671            (GLuint) (ctx->Fog.Density * FMC3_D_ONE);
672      }
673      else {
674         fi_type fi;
675         fi.f = ctx->Fog.Density;
676         i915->state.Fog[I915_FOGREG_MODE3] = fi.i;
677      }
678      break;
679
680   case GL_FOG_COLOR:
681      I915_STATECHANGE(i915, I915_UPLOAD_FOG);
682      i915->state.Fog[I915_FOGREG_COLOR] =
683         (_3DSTATE_FOG_COLOR_CMD |
684          ((GLubyte) (ctx->Fog.Color[0] * 255.0F) << 16) |
685          ((GLubyte) (ctx->Fog.Color[1] * 255.0F) << 8) |
686          ((GLubyte) (ctx->Fog.Color[2] * 255.0F) << 0));
687      break;
688
689   default:
690      break;
691   }
692}
693
694static void
695i915Hint(GLcontext * ctx, GLenum target, GLenum state)
696{
697   switch (target) {
698   case GL_FOG_HINT:
699      break;
700   default:
701      break;
702   }
703}
704
705/* =============================================================
706 */
707
708static void
709i915Enable(GLcontext * ctx, GLenum cap, GLboolean state)
710{
711   struct i915_context *i915 = I915_CONTEXT(ctx);
712
713   switch (cap) {
714   case GL_TEXTURE_2D:
715      break;
716
717   case GL_LIGHTING:
718   case GL_COLOR_SUM:
719      update_specular(ctx);
720      break;
721
722   case GL_ALPHA_TEST:
723      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
724      if (state)
725         i915->state.Ctx[I915_CTXREG_LIS6] |= S6_ALPHA_TEST_ENABLE;
726      else
727         i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_ALPHA_TEST_ENABLE;
728      break;
729
730   case GL_BLEND:
731      i915EvalLogicOpBlendState(ctx);
732      break;
733
734   case GL_COLOR_LOGIC_OP:
735      i915EvalLogicOpBlendState(ctx);
736
737      /* Logicop doesn't seem to work at 16bpp:
738       */
739      if (i915->intel.intelScreen->cpp == 2)    /* XXX FBO fix */
740         FALLBACK(&i915->intel, I915_FALLBACK_LOGICOP, state);
741      break;
742
743   case GL_FRAGMENT_PROGRAM_ARB:
744      break;
745
746   case GL_DITHER:
747      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
748      if (state)
749         i915->state.Ctx[I915_CTXREG_LIS5] |= S5_COLOR_DITHER_ENABLE;
750      else
751         i915->state.Ctx[I915_CTXREG_LIS5] &= ~S5_COLOR_DITHER_ENABLE;
752      break;
753
754   case GL_DEPTH_TEST:
755      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
756      if (state)
757         i915->state.Ctx[I915_CTXREG_LIS6] |= S6_DEPTH_TEST_ENABLE;
758      else
759         i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_DEPTH_TEST_ENABLE;
760
761      i915DepthMask(ctx, ctx->Depth.Mask);
762      break;
763
764   case GL_SCISSOR_TEST:
765      I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
766      if (state)
767         i915->state.Buffer[I915_DESTREG_SENABLE] =
768            (_3DSTATE_SCISSOR_ENABLE_CMD | ENABLE_SCISSOR_RECT);
769      else
770         i915->state.Buffer[I915_DESTREG_SENABLE] =
771            (_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
772      break;
773
774   case GL_LINE_SMOOTH:
775      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
776      if (state)
777         i915->state.Ctx[I915_CTXREG_LIS4] |= S4_LINE_ANTIALIAS_ENABLE;
778      else
779         i915->state.Ctx[I915_CTXREG_LIS4] &= ~S4_LINE_ANTIALIAS_ENABLE;
780      break;
781
782   case GL_FOG:
783      break;
784
785   case GL_CULL_FACE:
786      i915CullFaceFrontFace(ctx, 0);
787      break;
788
789   case GL_STENCIL_TEST:
790      {
791         GLboolean hw_stencil = GL_FALSE;
792         if (ctx->DrawBuffer) {
793            struct intel_renderbuffer *irbStencil
794               = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_STENCIL);
795            hw_stencil = (irbStencil && irbStencil->region);
796         }
797         if (hw_stencil) {
798            I915_STATECHANGE(i915, I915_UPLOAD_CTX);
799            if (state)
800               i915->state.Ctx[I915_CTXREG_LIS5] |= (S5_STENCIL_TEST_ENABLE |
801                                                     S5_STENCIL_WRITE_ENABLE);
802            else
803               i915->state.Ctx[I915_CTXREG_LIS5] &= ~(S5_STENCIL_TEST_ENABLE |
804                                                      S5_STENCIL_WRITE_ENABLE);
805         }
806         else {
807            FALLBACK(&i915->intel, I915_FALLBACK_STENCIL, state);
808         }
809      }
810      break;
811
812   case GL_POLYGON_STIPPLE:
813      /* The stipple command worked on my 855GM box, but not my 845G.
814       * I'll do more testing later to find out exactly which hardware
815       * supports it.  Disabled for now.
816       */
817      if (i915->intel.hw_stipple &&
818          i915->intel.reduced_primitive == GL_TRIANGLES) {
819         I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
820         if (state)
821            i915->state.Stipple[I915_STPREG_ST1] |= ST1_ENABLE;
822         else
823            i915->state.Stipple[I915_STPREG_ST1] &= ~ST1_ENABLE;
824      }
825      break;
826
827   case GL_POLYGON_SMOOTH:
828      break;
829
830   case GL_POINT_SMOOTH:
831      break;
832
833   default:
834      ;
835   }
836}
837
838
839static void
840i915_init_packets(struct i915_context *i915)
841{
842   intelScreenPrivate *screen = i915->intel.intelScreen;
843
844   /* Zero all state */
845   memset(&i915->state, 0, sizeof(i915->state));
846
847
848   {
849      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
850      /* Probably don't want to upload all this stuff every time one
851       * piece changes.
852       */
853      i915->state.Ctx[I915_CTXREG_LI] = (_3DSTATE_LOAD_STATE_IMMEDIATE_1 |
854                                         I1_LOAD_S(2) |
855                                         I1_LOAD_S(4) |
856                                         I1_LOAD_S(5) | I1_LOAD_S(6) | (3));
857      i915->state.Ctx[I915_CTXREG_LIS2] = 0;
858      i915->state.Ctx[I915_CTXREG_LIS4] = 0;
859      i915->state.Ctx[I915_CTXREG_LIS5] = 0;
860
861      if (screen->cpp == 2)     /* XXX FBO fix */
862         i915->state.Ctx[I915_CTXREG_LIS5] |= S5_COLOR_DITHER_ENABLE;
863
864
865      i915->state.Ctx[I915_CTXREG_LIS6] = (S6_COLOR_WRITE_ENABLE |
866                                           (2 << S6_TRISTRIP_PV_SHIFT));
867
868      i915->state.Ctx[I915_CTXREG_STATE4] = (_3DSTATE_MODES_4_CMD |
869                                             ENABLE_LOGIC_OP_FUNC |
870                                             LOGIC_OP_FUNC(LOGICOP_COPY) |
871                                             ENABLE_STENCIL_TEST_MASK |
872                                             STENCIL_TEST_MASK(0xff) |
873                                             ENABLE_STENCIL_WRITE_MASK |
874                                             STENCIL_WRITE_MASK(0xff));
875
876      i915->state.Ctx[I915_CTXREG_IAB] =
877         (_3DSTATE_INDEPENDENT_ALPHA_BLEND_CMD | IAB_MODIFY_ENABLE |
878          IAB_MODIFY_FUNC | IAB_MODIFY_SRC_FACTOR | IAB_MODIFY_DST_FACTOR);
879
880      i915->state.Ctx[I915_CTXREG_BLENDCOLOR0] =
881         _3DSTATE_CONST_BLEND_COLOR_CMD;
882      i915->state.Ctx[I915_CTXREG_BLENDCOLOR1] = 0;
883
884   }
885
886   {
887      I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
888      i915->state.Stipple[I915_STPREG_ST0] = _3DSTATE_STIPPLE;
889   }
890
891
892   {
893      I915_STATECHANGE(i915, I915_UPLOAD_FOG);
894      i915->state.Fog[I915_FOGREG_MODE0] = _3DSTATE_FOG_MODE_CMD;
895      i915->state.Fog[I915_FOGREG_MODE1] = (FMC1_FOGFUNC_MODIFY_ENABLE |
896                                            FMC1_FOGFUNC_VERTEX |
897                                            FMC1_FOGINDEX_MODIFY_ENABLE |
898                                            FMC1_FOGINDEX_W |
899                                            FMC1_C1_C2_MODIFY_ENABLE |
900                                            FMC1_DENSITY_MODIFY_ENABLE);
901      i915->state.Fog[I915_FOGREG_COLOR] = _3DSTATE_FOG_COLOR_CMD;
902   }
903
904
905   {
906      I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
907      /* color buffer offset/stride */
908      i915->state.Buffer[I915_DESTREG_CBUFADDR0] = _3DSTATE_BUF_INFO_CMD;
909      /* XXX FBO: remove this?  Also get set in i915_set_draw_region() */
910      i915->state.Buffer[I915_DESTREG_CBUFADDR1] = (BUF_3D_ID_COLOR_BACK | BUF_3D_PITCH(screen->front.pitch) |  /* pitch in bytes */
911                                                    BUF_3D_USE_FENCE);
912
913      i915->state.Buffer[I915_DESTREG_DBUFADDR0] = _3DSTATE_BUF_INFO_CMD;
914      /* XXX FBO: remove this?  Also get set in i915_set_draw_region() */
915      i915->state.Buffer[I915_DESTREG_DBUFADDR1] = (BUF_3D_ID_DEPTH | BUF_3D_PITCH(screen->depth.pitch) |       /* pitch in bytes */
916                                                    BUF_3D_USE_FENCE);
917
918      i915->state.Buffer[I915_DESTREG_DV0] = _3DSTATE_DST_BUF_VARS_CMD;
919
920      /* XXX FBO: remove this?  Also get set in i915_set_draw_region() */
921#if 0                           /* seems we don't need this */
922      switch (screen->fbFormat) {
923      case DV_PF_565:
924         i915->state.Buffer[I915_DESTREG_DV1] = (DSTORG_HORT_BIAS(0x8) |        /* .5 */
925                                                 DSTORG_VERT_BIAS(0x8) |        /* .5 */
926                                                 LOD_PRECLAMP_OGL |
927                                                 TEX_DEFAULT_COLOR_OGL |
928                                                 DITHER_FULL_ALWAYS |
929                                                 screen->fbFormat |
930                                                 DEPTH_FRMT_16_FIXED);
931         break;
932      case DV_PF_8888:
933         i915->state.Buffer[I915_DESTREG_DV1] = (DSTORG_HORT_BIAS(0x8) |        /* .5 */
934                                                 DSTORG_VERT_BIAS(0x8) |        /* .5 */
935                                                 LOD_PRECLAMP_OGL |
936                                                 TEX_DEFAULT_COLOR_OGL |
937                                                 screen->fbFormat |
938                                                 DEPTH_FRMT_24_FIXED_8_OTHER);
939         break;
940      }
941#endif
942
943
944      /* scissor */
945      i915->state.Buffer[I915_DESTREG_SENABLE] =
946         (_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
947      i915->state.Buffer[I915_DESTREG_SR0] = _3DSTATE_SCISSOR_RECT_0_CMD;
948      i915->state.Buffer[I915_DESTREG_SR1] = 0;
949      i915->state.Buffer[I915_DESTREG_SR2] = 0;
950   }
951
952
953#if 0
954   {
955      I915_STATECHANGE(i915, I915_UPLOAD_DEFAULTS);
956      i915->state.Default[I915_DEFREG_C0] = _3DSTATE_DEFAULT_DIFFUSE;
957      i915->state.Default[I915_DEFREG_C1] = 0;
958      i915->state.Default[I915_DEFREG_S0] = _3DSTATE_DEFAULT_SPECULAR;
959      i915->state.Default[I915_DEFREG_S1] = 0;
960      i915->state.Default[I915_DEFREG_Z0] = _3DSTATE_DEFAULT_Z;
961      i915->state.Default[I915_DEFREG_Z1] = 0;
962   }
963#endif
964
965
966   /* These will be emitted every at the head of every buffer, unless
967    * we get hardware contexts working.
968    */
969   i915->state.active = (I915_UPLOAD_PROGRAM |
970                         I915_UPLOAD_STIPPLE |
971                         I915_UPLOAD_CTX |
972                         I915_UPLOAD_BUFFERS | I915_UPLOAD_INVARIENT);
973}
974
975void
976i915InitStateFunctions(struct dd_function_table *functions)
977{
978   functions->AlphaFunc = i915AlphaFunc;
979   functions->BlendColor = i915BlendColor;
980   functions->BlendEquationSeparate = i915BlendEquationSeparate;
981   functions->BlendFuncSeparate = i915BlendFuncSeparate;
982   functions->ColorMask = i915ColorMask;
983   functions->CullFace = i915CullFaceFrontFace;
984   functions->DepthFunc = i915DepthFunc;
985   functions->DepthMask = i915DepthMask;
986   functions->Enable = i915Enable;
987   functions->Fogfv = i915Fogfv;
988   functions->FrontFace = i915CullFaceFrontFace;
989   functions->Hint = i915Hint;
990   functions->LightModelfv = i915LightModelfv;
991   functions->LineWidth = i915LineWidth;
992   functions->LogicOpcode = i915LogicOp;
993   functions->PointSize = i915PointSize;
994   functions->PolygonStipple = i915PolygonStipple;
995   functions->Scissor = i915Scissor;
996   functions->ShadeModel = i915ShadeModel;
997   functions->StencilFuncSeparate = i915StencilFuncSeparate;
998   functions->StencilMaskSeparate = i915StencilMaskSeparate;
999   functions->StencilOpSeparate = i915StencilOpSeparate;
1000}
1001
1002
1003void
1004i915InitState(struct i915_context *i915)
1005{
1006   GLcontext *ctx = &i915->intel.ctx;
1007
1008   i915_init_packets(i915);
1009
1010   _mesa_init_driver_state(ctx);
1011
1012   memcpy(&i915->initial, &i915->state, sizeof(i915->state));
1013   i915->current = &i915->state;
1014}
1015