src/mesa/drivers/dri/i915/i915_state.c

   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 "main/glheader.h"
  30 #include "main/context.h"
  31 #include "main/macros.h"
  32 #include "main/enums.h"
  33 #include "main/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
  50 static void
  51 i915StencilFuncSeparate(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
  76 static void
  77 i915StencilMaskSeparate(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
  92 static void
  93 i915StencilOpSeparate(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
 119 static void
 120 i915AlphaFunc(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  */
 142 static void
 143 i915EvalLogicOpBlendState(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
 165 static void
 166 i915BlendColor(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
 191 static GLuint
 192 translate_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
 210 static void
 211 i915UpdateBlendState(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
 261 static void
 262 i915BlendFuncSeparate(GLcontext * ctx, GLenum srcRGB,
 263                       GLenum dstRGB, GLenum srcA, GLenum dstA)
 264 {
 265    i915UpdateBlendState(ctx);
 266 }
 267
 268
 269 static void
 270 i915BlendEquationSeparate(GLcontext * ctx, GLenum eqRGB, GLenum eqA)
 271 {
 272    i915UpdateBlendState(ctx);
 273 }
 274
 275
 276 static void
 277 i915DepthFunc(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
 289 static void
 290 i915DepthMask(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
 306 /**
 307  * Update the viewport transformation matrix.  Depends on:
 308  *  - viewport pos/size
 309  *  - depthrange
 310  *  - window pos/size or FBO size
 311  */
 312 static void
 313 intelCalcViewport(GLcontext * ctx)
 314 {
 315    struct intel_context *intel = intel_context(ctx);
 316    const GLfloat *v = ctx->Viewport._WindowMap.m;
 317    const GLfloat depthScale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 318    GLfloat *m = intel->ViewportMatrix.m;
 319    GLfloat yScale, yBias;
 320
 321    if (ctx->DrawBuffer->Name) {
 322       /* User created FBO */
 323       struct intel_renderbuffer *irb
 324          = intel_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]);
 325       if (irb && !irb->RenderToTexture) {
 326          /* y=0=top */
 327          yScale = -1.0;
 328          yBias = irb->Base.Height;
 329       }
 330       else {
 331          /* y=0=bottom */
 332          yScale = 1.0;
 333          yBias = 0.0;
 334       }
 335    }
 336    else {
 337       /* window buffer, y=0=top */
 338       yScale = -1.0;
 339       yBias = (intel->driDrawable) ? intel->driDrawable->h : 0.0F;
 340    }
 341
 342    m[MAT_SX] = v[MAT_SX];
 343    m[MAT_TX] = v[MAT_TX];
 344
 345    m[MAT_SY] = v[MAT_SY] * yScale;
 346    m[MAT_TY] = v[MAT_TY] * yScale + yBias;
 347
 348    m[MAT_SZ] = v[MAT_SZ] * depthScale;
 349    m[MAT_TZ] = v[MAT_TZ] * depthScale;
 350 }
 351
 352
 353 /** Called from ctx->Driver.Viewport() */
 354 static void
 355 i915Viewport(GLcontext * ctx,
 356               GLint x, GLint y, GLsizei width, GLsizei height)
 357 {
 358    intelCalcViewport(ctx);
 359
 360    intel_viewport(ctx, x, y, width, height);
 361 }
 362
 363
 364 /** Called from ctx->Driver.DepthRange() */
 365 static void
 366 i915DepthRange(GLcontext * ctx, GLclampd nearval, GLclampd farval)
 367 {
 368    intelCalcViewport(ctx);
 369 }
 370
 371
 372 /* =============================================================
 373  * Polygon stipple
 374  *
 375  * The i915 supports a 4x4 stipple natively, GL wants 32x32.
 376  * Fortunately stipple is usually a repeating pattern.
 377  */
 378 static void
 379 i915PolygonStipple(GLcontext * ctx, const GLubyte * mask)
 380 {
 381    struct i915_context *i915 = I915_CONTEXT(ctx);
 382    const GLubyte *m;
 383    GLubyte p[4];
 384    int i, j, k;
 385    int active = (ctx->Polygon.StippleFlag &&
 386                  i915->intel.reduced_primitive == GL_TRIANGLES);
 387    GLuint newMask;
 388
 389    if (active) {
 390       I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
 391       i915->state.Stipple[I915_STPREG_ST1] &= ~ST1_ENABLE;
 392    }
 393
 394    /* Use the already unpacked stipple data from the context rather than the
 395     * uninterpreted mask passed in.
 396     */
 397    mask = (const GLubyte *)ctx->PolygonStipple;
 398    m = mask;
 399
 400    p[0] = mask[12] & 0xf;
 401    p[0] |= p[0] << 4;
 402    p[1] = mask[8] & 0xf;
 403    p[1] |= p[1] << 4;
 404    p[2] = mask[4] & 0xf;
 405    p[2] |= p[2] << 4;
 406    p[3] = mask[0] & 0xf;
 407    p[3] |= p[3] << 4;
 408
 409    for (k = 0; k < 8; k++)
 410       for (j = 3; j >= 0; j--)
 411          for (i = 0; i < 4; i++, m++)
 412             if (*m != p[j]) {
 413                i915->intel.hw_stipple = 0;
 414                return;
 415             }
 416
 417    newMask = (((p[0] & 0xf) << 0) |
 418               ((p[1] & 0xf) << 4) |
 419               ((p[2] & 0xf) << 8) | ((p[3] & 0xf) << 12));
 420
 421
 422    if (newMask == 0xffff || newMask == 0x0) {
 423       /* this is needed to make conform pass */
 424       i915->intel.hw_stipple = 0;
 425       return;
 426    }
 427
 428    i915->state.Stipple[I915_STPREG_ST1] &= ~0xffff;
 429    i915->state.Stipple[I915_STPREG_ST1] |= newMask;
 430    i915->intel.hw_stipple = 1;
 431
 432    if (active)
 433       i915->state.Stipple[I915_STPREG_ST1] |= ST1_ENABLE;
 434 }
 435
 436
 437 /* =============================================================
 438  * Hardware clipping
 439  */
 440 static void
 441 i915Scissor(GLcontext * ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 442 {
 443    struct i915_context *i915 = I915_CONTEXT(ctx);
 444    int x1, y1, x2, y2;
 445
 446    if (!ctx->DrawBuffer)
 447       return;
 448
 449    DBG("%s %d,%d %dx%d\n", __FUNCTION__, x, y, w, h);
 450
 451    if (ctx->DrawBuffer->Name == 0) {
 452       x1 = x;
 453       y1 = ctx->DrawBuffer->Height - (y + h);
 454       x2 = x + w - 1;
 455       y2 = y1 + h - 1;
 456       DBG("%s %d..%d,%d..%d (inverted)\n", __FUNCTION__, x1, x2, y1, y2);
 457    }
 458    else {
 459       /* FBO - not inverted
 460        */
 461       x1 = x;
 462       y1 = y;
 463       x2 = x + w - 1;
 464       y2 = y + h - 1;
 465       DBG("%s %d..%d,%d..%d (not inverted)\n", __FUNCTION__, x1, x2, y1, y2);
 466    }
 467
 468    x1 = CLAMP(x1, 0, ctx->DrawBuffer->Width - 1);
 469    y1 = CLAMP(y1, 0, ctx->DrawBuffer->Height - 1);
 470    x2 = CLAMP(x2, 0, ctx->DrawBuffer->Width - 1);
 471    y2 = CLAMP(y2, 0, ctx->DrawBuffer->Height - 1);
 472
 473    DBG("%s %d..%d,%d..%d (clamped)\n", __FUNCTION__, x1, x2, y1, y2);
 474
 475    I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
 476    i915->state.Buffer[I915_DESTREG_SR1] = (y1 << 16) | (x1 & 0xffff);
 477    i915->state.Buffer[I915_DESTREG_SR2] = (y2 << 16) | (x2 & 0xffff);
 478 }
 479
 480 static void
 481 i915LogicOp(GLcontext * ctx, GLenum opcode)
 482 {
 483    struct i915_context *i915 = I915_CONTEXT(ctx);
 484    int tmp = intel_translate_logic_op(opcode);
 485
 486    DBG("%s\n", __FUNCTION__);
 487
 488    I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 489    i915->state.Ctx[I915_CTXREG_STATE4] &= ~LOGICOP_MASK;
 490    i915->state.Ctx[I915_CTXREG_STATE4] |= LOGIC_OP_FUNC(tmp);
 491 }
 492
 493
 494
 495 static void
 496 i915CullFaceFrontFace(GLcontext * ctx, GLenum unused)
 497 {
 498    struct i915_context *i915 = I915_CONTEXT(ctx);
 499    GLuint mode;
 500
 501    DBG("%s %d\n", __FUNCTION__,
 502        ctx->DrawBuffer ? ctx->DrawBuffer->Name : 0);
 503
 504    if (!ctx->Polygon.CullFlag) {
 505       mode = S4_CULLMODE_NONE;
 506    }
 507    else if (ctx->Polygon.CullFaceMode != GL_FRONT_AND_BACK) {
 508       mode = S4_CULLMODE_CW;
 509
 510       if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)
 511          mode ^= (S4_CULLMODE_CW ^ S4_CULLMODE_CCW);
 512       if (ctx->Polygon.CullFaceMode == GL_FRONT)
 513          mode ^= (S4_CULLMODE_CW ^ S4_CULLMODE_CCW);
 514       if (ctx->Polygon.FrontFace != GL_CCW)
 515          mode ^= (S4_CULLMODE_CW ^ S4_CULLMODE_CCW);
 516    }
 517    else {
 518       mode = S4_CULLMODE_BOTH;
 519    }
 520
 521    I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 522    i915->state.Ctx[I915_CTXREG_LIS4] &= ~S4_CULLMODE_MASK;
 523    i915->state.Ctx[I915_CTXREG_LIS4] |= mode;
 524 }
 525
 526 static void
 527 i915LineWidth(GLcontext * ctx, GLfloat widthf)
 528 {
 529    struct i915_context *i915 = I915_CONTEXT(ctx);
 530    int lis4 = i915->state.Ctx[I915_CTXREG_LIS4] & ~S4_LINE_WIDTH_MASK;
 531    int width;
 532
 533    DBG("%s\n", __FUNCTION__);
 534
 535    width = (int) (widthf * 2);
 536    CLAMP_SELF(width, 1, 0xf);
 537    lis4 |= width << S4_LINE_WIDTH_SHIFT;
 538
 539    if (lis4 != i915->state.Ctx[I915_CTXREG_LIS4]) {
 540       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 541       i915->state.Ctx[I915_CTXREG_LIS4] = lis4;
 542    }
 543 }
 544
 545 static void
 546 i915PointSize(GLcontext * ctx, GLfloat size)
 547 {
 548    struct i915_context *i915 = I915_CONTEXT(ctx);
 549    int lis4 = i915->state.Ctx[I915_CTXREG_LIS4] & ~S4_POINT_WIDTH_MASK;
 550    GLint point_size = (int) size;
 551
 552    DBG("%s\n", __FUNCTION__);
 553
 554    CLAMP_SELF(point_size, 1, 255);
 555    lis4 |= point_size << S4_POINT_WIDTH_SHIFT;
 556
 557    if (lis4 != i915->state.Ctx[I915_CTXREG_LIS4]) {
 558       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 559       i915->state.Ctx[I915_CTXREG_LIS4] = lis4;
 560    }
 561 }
 562
 563
 564 /* =============================================================
 565  * Color masks
 566  */
 567
 568 static void
 569 i915ColorMask(GLcontext * ctx,
 570               GLboolean r, GLboolean g, GLboolean b, GLboolean a)
 571 {
 572    struct i915_context *i915 = I915_CONTEXT(ctx);
 573    GLuint tmp = i915->state.Ctx[I915_CTXREG_LIS5] & ~S5_WRITEDISABLE_MASK;
 574
 575    DBG("%s r(%d) g(%d) b(%d) a(%d)\n", __FUNCTION__, r, g, b,
 576        a);
 577
 578    if (!r)
 579       tmp |= S5_WRITEDISABLE_RED;
 580    if (!g)
 581       tmp |= S5_WRITEDISABLE_GREEN;
 582    if (!b)
 583       tmp |= S5_WRITEDISABLE_BLUE;
 584    if (!a)
 585       tmp |= S5_WRITEDISABLE_ALPHA;
 586
 587    if (tmp != i915->state.Ctx[I915_CTXREG_LIS5]) {
 588       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 589       i915->state.Ctx[I915_CTXREG_LIS5] = tmp;
 590    }
 591 }
 592
 593 static void
 594 update_specular(GLcontext * ctx)
 595 {
 596    /* A hack to trigger the rebuild of the fragment program.
 597     */
 598    intel_context(ctx)->NewGLState |= _NEW_TEXTURE;
 599 }
 600
 601 static void
 602 i915LightModelfv(GLcontext * ctx, GLenum pname, const GLfloat * param)
 603 {
 604    DBG("%s\n", __FUNCTION__);
 605
 606    if (pname == GL_LIGHT_MODEL_COLOR_CONTROL) {
 607       update_specular(ctx);
 608    }
 609 }
 610
 611 static void
 612 i915ShadeModel(GLcontext * ctx, GLenum mode)
 613 {
 614    struct i915_context *i915 = I915_CONTEXT(ctx);
 615    I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 616
 617    if (mode == GL_SMOOTH) {
 618       i915->state.Ctx[I915_CTXREG_LIS4] &= ~(S4_FLATSHADE_ALPHA |
 619                                              S4_FLATSHADE_COLOR |
 620                                              S4_FLATSHADE_SPECULAR);
 621    }
 622    else {
 623       i915->state.Ctx[I915_CTXREG_LIS4] |= (S4_FLATSHADE_ALPHA |
 624                                             S4_FLATSHADE_COLOR |
 625                                             S4_FLATSHADE_SPECULAR);
 626    }
 627 }
 628
 629 /* =============================================================
 630  * Fog
 631  */
 632 void
 633 i915_update_fog(GLcontext * ctx)
 634 {
 635    struct i915_context *i915 = I915_CONTEXT(ctx);
 636    GLenum mode;
 637    GLboolean enabled;
 638    GLboolean try_pixel_fog;
 639
 640    if (ctx->FragmentProgram._Current) {
 641       /* Pull in static fog state from program */
 642       mode = ctx->FragmentProgram._Current->FogOption;
 643       enabled = (mode != GL_NONE);
 644       try_pixel_fog = 0;
 645    }
 646    else {
 647       enabled = ctx->Fog.Enabled;
 648       mode = ctx->Fog.Mode;
 649 #if 0
 650       /* XXX - DISABLED -- Need ortho fallback */
 651       try_pixel_fog = (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT
 652                        && ctx->Hint.Fog == GL_NICEST);
 653 #else
 654       try_pixel_fog = 0;
 655 #endif
 656    }
 657
 658    if (!enabled) {
 659       i915->vertex_fog = I915_FOG_NONE;
 660    }
 661    else if (try_pixel_fog) {
 662       I915_STATECHANGE(i915, I915_UPLOAD_FOG);
 663       i915->state.Fog[I915_FOGREG_MODE1] &= ~FMC1_FOGFUNC_MASK;
 664       i915->vertex_fog = I915_FOG_PIXEL;
 665
 666       switch (mode) {
 667       case GL_LINEAR:
 668          if (ctx->Fog.End <= ctx->Fog.Start) {
 669             /* XXX - this won't work with fragment programs.  Need to
 670              * either fallback or append fog instructions to end of
 671              * program in the case of linear fog.
 672              */
 673             printf("vertex fog!\n");
 674             i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_VERTEX;
 675             i915->vertex_fog = I915_FOG_VERTEX;
 676          }
 677          else {
 678             GLfloat c2 = 1.0 / (ctx->Fog.End - ctx->Fog.Start);
 679             GLfloat c1 = ctx->Fog.End * c2;
 680
 681             i915->state.Fog[I915_FOGREG_MODE1] &= ~FMC1_C1_MASK;
 682             i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_PIXEL_LINEAR;
 683             i915->state.Fog[I915_FOGREG_MODE1] |=
 684                ((GLuint) (c1 * FMC1_C1_ONE)) & FMC1_C1_MASK;
 685
 686             if (i915->state.Fog[I915_FOGREG_MODE1] & FMC1_FOGINDEX_Z) {
 687                i915->state.Fog[I915_FOGREG_MODE2]
 688                   = (GLuint) (c2 * FMC2_C2_ONE);
 689             }
 690             else {
 691                fi_type fi;
 692                fi.f = c2;
 693                i915->state.Fog[I915_FOGREG_MODE2] = fi.i;
 694             }
 695          }
 696          break;
 697       case GL_EXP:
 698          i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_PIXEL_EXP;
 699          break;
 700       case GL_EXP2:
 701          i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_PIXEL_EXP2;
 702          break;
 703       default:
 704          break;
 705       }
 706    }
 707    else { /* if (i915->vertex_fog != I915_FOG_VERTEX) */
 708       I915_STATECHANGE(i915, I915_UPLOAD_FOG);
 709       i915->state.Fog[I915_FOGREG_MODE1] &= ~FMC1_FOGFUNC_MASK;
 710       i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_VERTEX;
 711       i915->vertex_fog = I915_FOG_VERTEX;
 712    }
 713
 714    I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 715    I915_ACTIVESTATE(i915, I915_UPLOAD_FOG, enabled);
 716    if (enabled)
 717       i915->state.Ctx[I915_CTXREG_LIS5] |= S5_FOG_ENABLE;
 718    else
 719       i915->state.Ctx[I915_CTXREG_LIS5] &= ~S5_FOG_ENABLE;
 720
 721    /* Always enable pixel fog.  Vertex fog using fog coord will conflict
 722     * with fog code appended onto fragment program.
 723     */
 724     _tnl_allow_vertex_fog( ctx, 0 );
 725     _tnl_allow_pixel_fog( ctx, 1 );
 726 }
 727
 728 static void
 729 i915Fogfv(GLcontext * ctx, GLenum pname, const GLfloat * param)
 730 {
 731    struct i915_context *i915 = I915_CONTEXT(ctx);
 732
 733    switch (pname) {
 734    case GL_FOG_COORDINATE_SOURCE_EXT:
 735    case GL_FOG_MODE:
 736    case GL_FOG_START:
 737    case GL_FOG_END:
 738       break;
 739
 740    case GL_FOG_DENSITY:
 741       I915_STATECHANGE(i915, I915_UPLOAD_FOG);
 742
 743       if (i915->state.Fog[I915_FOGREG_MODE1] & FMC1_FOGINDEX_Z) {
 744          i915->state.Fog[I915_FOGREG_MODE3] =
 745             (GLuint) (ctx->Fog.Density * FMC3_D_ONE);
 746       }
 747       else {
 748          fi_type fi;
 749          fi.f = ctx->Fog.Density;
 750          i915->state.Fog[I915_FOGREG_MODE3] = fi.i;
 751       }
 752       break;
 753
 754    case GL_FOG_COLOR:
 755       I915_STATECHANGE(i915, I915_UPLOAD_FOG);
 756       i915->state.Fog[I915_FOGREG_COLOR] =
 757          (_3DSTATE_FOG_COLOR_CMD |
 758           ((GLubyte) (ctx->Fog.Color[0] * 255.0F) << 16) |
 759           ((GLubyte) (ctx->Fog.Color[1] * 255.0F) << 8) |
 760           ((GLubyte) (ctx->Fog.Color[2] * 255.0F) << 0));
 761       break;
 762
 763    default:
 764       break;
 765    }
 766 }
 767
 768 static void
 769 i915Hint(GLcontext * ctx, GLenum target, GLenum state)
 770 {
 771    switch (target) {
 772    case GL_FOG_HINT:
 773       break;
 774    default:
 775       break;
 776    }
 777 }
 778
 779 /* =============================================================
 780  */
 781
 782 static void
 783 i915Enable(GLcontext * ctx, GLenum cap, GLboolean state)
 784 {
 785    struct i915_context *i915 = I915_CONTEXT(ctx);
 786
 787    switch (cap) {
 788    case GL_TEXTURE_2D:
 789       break;
 790
 791    case GL_LIGHTING:
 792    case GL_COLOR_SUM:
 793       update_specular(ctx);
 794       break;
 795
 796    case GL_ALPHA_TEST:
 797       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 798       if (state)
 799          i915->state.Ctx[I915_CTXREG_LIS6] |= S6_ALPHA_TEST_ENABLE;
 800       else
 801          i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_ALPHA_TEST_ENABLE;
 802       break;
 803
 804    case GL_BLEND:
 805       i915EvalLogicOpBlendState(ctx);
 806       break;
 807
 808    case GL_COLOR_LOGIC_OP:
 809       i915EvalLogicOpBlendState(ctx);
 810
 811       /* Logicop doesn't seem to work at 16bpp:
 812        */
 813       if (ctx->Visual.rgbBits == 16)
 814          FALLBACK(&i915->intel, I915_FALLBACK_LOGICOP, state);
 815       break;
 816
 817    case GL_FRAGMENT_PROGRAM_ARB:
 818       break;
 819
 820    case GL_DITHER:
 821       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 822       if (state)
 823          i915->state.Ctx[I915_CTXREG_LIS5] |= S5_COLOR_DITHER_ENABLE;
 824       else
 825          i915->state.Ctx[I915_CTXREG_LIS5] &= ~S5_COLOR_DITHER_ENABLE;
 826       break;
 827
 828    case GL_DEPTH_TEST:
 829       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 830       if (state)
 831          i915->state.Ctx[I915_CTXREG_LIS6] |= S6_DEPTH_TEST_ENABLE;
 832       else
 833          i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_DEPTH_TEST_ENABLE;
 834
 835       i915DepthMask(ctx, ctx->Depth.Mask);
 836       break;
 837
 838    case GL_SCISSOR_TEST:
 839       I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
 840       if (state)
 841          i915->state.Buffer[I915_DESTREG_SENABLE] =
 842             (_3DSTATE_SCISSOR_ENABLE_CMD | ENABLE_SCISSOR_RECT);
 843       else
 844          i915->state.Buffer[I915_DESTREG_SENABLE] =
 845             (_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
 846       break;
 847
 848    case GL_LINE_SMOOTH:
 849       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 850       if (state)
 851          i915->state.Ctx[I915_CTXREG_LIS4] |= S4_LINE_ANTIALIAS_ENABLE;
 852       else
 853          i915->state.Ctx[I915_CTXREG_LIS4] &= ~S4_LINE_ANTIALIAS_ENABLE;
 854       break;
 855
 856    case GL_FOG:
 857       break;
 858
 859    case GL_CULL_FACE:
 860       i915CullFaceFrontFace(ctx, 0);
 861       break;
 862
 863    case GL_STENCIL_TEST:
 864       {
 865          GLboolean hw_stencil = GL_FALSE;
 866          if (ctx->DrawBuffer) {
 867             struct intel_renderbuffer *irbStencil
 868                = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_STENCIL);
 869             hw_stencil = (irbStencil && irbStencil->region);
 870          }
 871          if (hw_stencil) {
 872             I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 873             if (state)
 874                i915->state.Ctx[I915_CTXREG_LIS5] |= (S5_STENCIL_TEST_ENABLE |
 875                                                      S5_STENCIL_WRITE_ENABLE);
 876             else
 877                i915->state.Ctx[I915_CTXREG_LIS5] &= ~(S5_STENCIL_TEST_ENABLE |
 878                                                       S5_STENCIL_WRITE_ENABLE);
 879          }
 880          else {
 881             FALLBACK(&i915->intel, I915_FALLBACK_STENCIL, state);
 882          }
 883       }
 884       break;
 885
 886    case GL_POLYGON_STIPPLE:
 887       /* The stipple command worked on my 855GM box, but not my 845G.
 888        * I'll do more testing later to find out exactly which hardware
 889        * supports it.  Disabled for now.
 890        */
 891       if (i915->intel.hw_stipple &&
 892           i915->intel.reduced_primitive == GL_TRIANGLES) {
 893          I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
 894          if (state)
 895             i915->state.Stipple[I915_STPREG_ST1] |= ST1_ENABLE;
 896          else
 897             i915->state.Stipple[I915_STPREG_ST1] &= ~ST1_ENABLE;
 898       }
 899       break;
 900
 901    case GL_POLYGON_SMOOTH:
 902       break;
 903
 904    case GL_POINT_SMOOTH:
 905       break;
 906
 907    default:
 908       ;
 909    }
 910 }
 911
 912
 913 static void
 914 i915_init_packets(struct i915_context *i915)
 915 {
 916    /* Zero all state */
 917    memset(&i915->state, 0, sizeof(i915->state));
 918
 919
 920    {
 921       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
 922       /* Probably don't want to upload all this stuff every time one
 923        * piece changes.
 924        */
 925       i915->state.Ctx[I915_CTXREG_LI] = (_3DSTATE_LOAD_STATE_IMMEDIATE_1 |
 926                                          I1_LOAD_S(2) |
 927                                          I1_LOAD_S(4) |
 928                                          I1_LOAD_S(5) | I1_LOAD_S(6) | (3));
 929       i915->state.Ctx[I915_CTXREG_LIS2] = 0;
 930       i915->state.Ctx[I915_CTXREG_LIS4] = 0;
 931       i915->state.Ctx[I915_CTXREG_LIS5] = 0;
 932
 933       if (i915->intel.ctx.Visual.rgbBits == 16)
 934          i915->state.Ctx[I915_CTXREG_LIS5] |= S5_COLOR_DITHER_ENABLE;
 935
 936
 937       i915->state.Ctx[I915_CTXREG_LIS6] = (S6_COLOR_WRITE_ENABLE |
 938                                            (2 << S6_TRISTRIP_PV_SHIFT));
 939
 940       i915->state.Ctx[I915_CTXREG_STATE4] = (_3DSTATE_MODES_4_CMD |
 941                                              ENABLE_LOGIC_OP_FUNC |
 942                                              LOGIC_OP_FUNC(LOGICOP_COPY) |
 943                                              ENABLE_STENCIL_TEST_MASK |
 944                                              STENCIL_TEST_MASK(0xff) |
 945                                              ENABLE_STENCIL_WRITE_MASK |
 946                                              STENCIL_WRITE_MASK(0xff));
 947
 948       i915->state.Ctx[I915_CTXREG_IAB] =
 949          (_3DSTATE_INDEPENDENT_ALPHA_BLEND_CMD | IAB_MODIFY_ENABLE |
 950           IAB_MODIFY_FUNC | IAB_MODIFY_SRC_FACTOR | IAB_MODIFY_DST_FACTOR);
 951
 952       i915->state.Ctx[I915_CTXREG_BLENDCOLOR0] =
 953          _3DSTATE_CONST_BLEND_COLOR_CMD;
 954       i915->state.Ctx[I915_CTXREG_BLENDCOLOR1] = 0;
 955
 956    }
 957
 958    {
 959       I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
 960       i915->state.Stipple[I915_STPREG_ST0] = _3DSTATE_STIPPLE;
 961    }
 962
 963
 964    {
 965       I915_STATECHANGE(i915, I915_UPLOAD_FOG);
 966       i915->state.Fog[I915_FOGREG_MODE0] = _3DSTATE_FOG_MODE_CMD;
 967       i915->state.Fog[I915_FOGREG_MODE1] = (FMC1_FOGFUNC_MODIFY_ENABLE |
 968                                             FMC1_FOGFUNC_VERTEX |
 969                                             FMC1_FOGINDEX_MODIFY_ENABLE |
 970                                             FMC1_FOGINDEX_W |
 971                                             FMC1_C1_C2_MODIFY_ENABLE |
 972                                             FMC1_DENSITY_MODIFY_ENABLE);
 973       i915->state.Fog[I915_FOGREG_COLOR] = _3DSTATE_FOG_COLOR_CMD;
 974    }
 975
 976    {
 977       i915->state.Buffer[I915_DESTREG_DV0] = _3DSTATE_DST_BUF_VARS_CMD;
 978
 979       /* scissor */
 980       i915->state.Buffer[I915_DESTREG_SENABLE] =
 981          (_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
 982       i915->state.Buffer[I915_DESTREG_SR0] = _3DSTATE_SCISSOR_RECT_0_CMD;
 983       i915->state.Buffer[I915_DESTREG_SR1] = 0;
 984       i915->state.Buffer[I915_DESTREG_SR2] = 0;
 985    }
 986
 987
 988 #if 0
 989    {
 990       I915_STATECHANGE(i915, I915_UPLOAD_DEFAULTS);
 991       i915->state.Default[I915_DEFREG_C0] = _3DSTATE_DEFAULT_DIFFUSE;
 992       i915->state.Default[I915_DEFREG_C1] = 0;
 993       i915->state.Default[I915_DEFREG_S0] = _3DSTATE_DEFAULT_SPECULAR;
 994       i915->state.Default[I915_DEFREG_S1] = 0;
 995       i915->state.Default[I915_DEFREG_Z0] = _3DSTATE_DEFAULT_Z;
 996       i915->state.Default[I915_DEFREG_Z1] = 0;
 997    }
 998 #endif
 999
1000
1001    /* These will be emitted every at the head of every buffer, unless
1002     * we get hardware contexts working.
1003     */
1004    i915->state.active = (I915_UPLOAD_PROGRAM |
1005                          I915_UPLOAD_STIPPLE |
1006                          I915_UPLOAD_CTX |
1007                          I915_UPLOAD_BUFFERS | I915_UPLOAD_INVARIENT);
1008 }
1009
1010 void
1011 i915InitStateFunctions(struct dd_function_table *functions)
1012 {
1013    functions->AlphaFunc = i915AlphaFunc;
1014    functions->BlendColor = i915BlendColor;
1015    functions->BlendEquationSeparate = i915BlendEquationSeparate;
1016    functions->BlendFuncSeparate = i915BlendFuncSeparate;
1017    functions->ColorMask = i915ColorMask;
1018    functions->CullFace = i915CullFaceFrontFace;
1019    functions->DepthFunc = i915DepthFunc;
1020    functions->DepthMask = i915DepthMask;
1021    functions->Enable = i915Enable;
1022    functions->Fogfv = i915Fogfv;
1023    functions->FrontFace = i915CullFaceFrontFace;
1024    functions->Hint = i915Hint;
1025    functions->LightModelfv = i915LightModelfv;
1026    functions->LineWidth = i915LineWidth;
1027    functions->LogicOpcode = i915LogicOp;
1028    functions->PointSize = i915PointSize;
1029    functions->PolygonStipple = i915PolygonStipple;
1030    functions->Scissor = i915Scissor;
1031    functions->ShadeModel = i915ShadeModel;
1032    functions->StencilFuncSeparate = i915StencilFuncSeparate;
1033    functions->StencilMaskSeparate = i915StencilMaskSeparate;
1034    functions->StencilOpSeparate = i915StencilOpSeparate;
1035    functions->DepthRange = i915DepthRange;
1036    functions->Viewport = i915Viewport;
1037 }
1038
1039
1040 void
1041 i915InitState(struct i915_context *i915)
1042 {
1043    GLcontext *ctx = &i915->intel.ctx;
1044
1045    i915_init_packets(i915);
1046
1047    _mesa_init_driver_state(ctx);
1048
1049    memcpy(&i915->initial, &i915->state, sizeof(i915->state));
1050    i915->current = &i915->state;
1051 }