i830_state.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

   }
}

/* =============================================================
 */

static void
i830Enable(GLcontext * ctx, GLenum cap, GLboolean state)
{
   struct i830_context *i830 = i830_context(ctx);

   switch (cap) {
   case GL_LIGHTING:
   case GL_COLOR_SUM:
      update_specular(ctx);
      break;

   case GL_ALPHA_TEST:
      I830_STATECHANGE(i830, I830_UPLOAD_CTX);
      i830->state.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_DIS_ALPHA_TEST_MASK;
      if (state)
         i830->state.Ctx[I830_CTXREG_ENABLES_1] |= ENABLE_ALPHA_TEST;
      else
         i830->state.Ctx[I830_CTXREG_ENABLES_1] |= DISABLE_ALPHA_TEST;

      break;

   case GL_BLEND:
      i830EvalLogicOpBlendState(ctx);
      break;

   case GL_COLOR_LOGIC_OP:
      i830EvalLogicOpBlendState(ctx);

      /* Logicop doesn't seem to work at 16bpp:
       */
      if (i830->intel.ctx.Visual.rgbBits == 16)
         FALLBACK(&i830->intel, I830_FALLBACK_LOGICOP, state);
      break;

   case GL_DITHER:
      I830_STATECHANGE(i830, I830_UPLOAD_CTX);
      i830->state.Ctx[I830_CTXREG_ENABLES_2] &= ~ENABLE_DITHER;

      if (state)
         i830->state.Ctx[I830_CTXREG_ENABLES_2] |= ENABLE_DITHER;
      else
         i830->state.Ctx[I830_CTXREG_ENABLES_2] |= DISABLE_DITHER;
      break;

   case GL_DEPTH_TEST:
      I830_STATECHANGE(i830, I830_UPLOAD_CTX);
      i830->state.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_DIS_DEPTH_TEST_MASK;

      if (state)
         i830->state.Ctx[I830_CTXREG_ENABLES_1] |= ENABLE_DEPTH_TEST;
      else
         i830->state.Ctx[I830_CTXREG_ENABLES_1] |= DISABLE_DEPTH_TEST;

      /* Also turn off depth writes when GL_DEPTH_TEST is disabled:
       */
      i830DepthMask(ctx, ctx->Depth.Mask);
      break;

   case GL_SCISSOR_TEST:
      I830_STATECHANGE(i830, I830_UPLOAD_BUFFERS);

      if (state)
         i830->state.Buffer[I830_DESTREG_SENABLE] =
            (_3DSTATE_SCISSOR_ENABLE_CMD | ENABLE_SCISSOR_RECT);
      else
         i830->state.Buffer[I830_DESTREG_SENABLE] =
            (_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);

      break;

   case GL_LINE_SMOOTH:
      I830_STATECHANGE(i830, I830_UPLOAD_CTX);

      i830->state.Ctx[I830_CTXREG_AA] &= ~AA_LINE_ENABLE;
      if (state)
         i830->state.Ctx[I830_CTXREG_AA] |= AA_LINE_ENABLE;
      else
         i830->state.Ctx[I830_CTXREG_AA] |= AA_LINE_DISABLE;
      break;

   case GL_FOG:
      I830_STATECHANGE(i830, I830_UPLOAD_CTX);
      i830->state.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_DIS_FOG_MASK;
      if (state)
         i830->state.Ctx[I830_CTXREG_ENABLES_1] |= ENABLE_FOG;
      else
         i830->state.Ctx[I830_CTXREG_ENABLES_1] |= DISABLE_FOG;
      break;

   case GL_CULL_FACE:
      i830CullFaceFrontFace(ctx, 0);
      break;

   case GL_TEXTURE_2D:
      break;

   case GL_STENCIL_TEST:
      {
         GLboolean hw_stencil = GL_FALSE;
         if (ctx->DrawBuffer) {
            struct intel_renderbuffer *irbStencil
               = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_STENCIL);
            hw_stencil = (irbStencil && irbStencil->region);
         }
         if (hw_stencil) {
            I830_STATECHANGE(i830, I830_UPLOAD_CTX);

            if (state) {
               i830->state.Ctx[I830_CTXREG_ENABLES_1] |= ENABLE_STENCIL_TEST;
               i830->state.Ctx[I830_CTXREG_ENABLES_2] |= ENABLE_STENCIL_WRITE;
            }
            else {
               i830->state.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_STENCIL_TEST;
               i830->state.Ctx[I830_CTXREG_ENABLES_2] &=
                  ~ENABLE_STENCIL_WRITE;
               i830->state.Ctx[I830_CTXREG_ENABLES_1] |= DISABLE_STENCIL_TEST;
               i830->state.Ctx[I830_CTXREG_ENABLES_2] |=
                  DISABLE_STENCIL_WRITE;
            }
         }
         else {
            FALLBACK(&i830->intel, I830_FALLBACK_STENCIL, state);
         }
      }
      break;

   case GL_POLYGON_STIPPLE:
      /* The stipple command worked on my 855GM box, but not my 845G.
       * I'll do more testing later to find out exactly which hardware
       * supports it.  Disabled for now.
       */
      if (i830->intel.hw_stipple &&
          i830->intel.reduced_primitive == GL_TRIANGLES) {
         I830_STATECHANGE(i830, I830_UPLOAD_STIPPLE);
         i830->state.Stipple[I830_STPREG_ST1] &= ~ST1_ENABLE;
         if (state)
            i830->state.Stipple[I830_STPREG_ST1] |= ST1_ENABLE;
      }
      break;

   default:
      ;
   }
}


static void
i830_init_packets(struct i830_context *i830)
{
   /* Zero all state */
   memset(&i830->state, 0, sizeof(i830->state));

   /* Set default blend state */
   i830->state.TexBlend[0][0] = (_3DSTATE_MAP_BLEND_OP_CMD(0) |
                                 TEXPIPE_COLOR |
                                 ENABLE_TEXOUTPUT_WRT_SEL |
                                 TEXOP_OUTPUT_CURRENT |
                                 DISABLE_TEX_CNTRL_STAGE |
                                 TEXOP_SCALE_1X |
                                 TEXOP_MODIFY_PARMS |
                                 TEXOP_LAST_STAGE | TEXBLENDOP_ARG1);
   i830->state.TexBlend[0][1] = (_3DSTATE_MAP_BLEND_OP_CMD(0) |
                                 TEXPIPE_ALPHA |
                                 ENABLE_TEXOUTPUT_WRT_SEL |
                                 TEXOP_OUTPUT_CURRENT |
                                 TEXOP_SCALE_1X |
                                 TEXOP_MODIFY_PARMS | TEXBLENDOP_ARG1);
   i830->state.TexBlend[0][2] = (_3DSTATE_MAP_BLEND_ARG_CMD(0) |
                                 TEXPIPE_COLOR |
                                 TEXBLEND_ARG1 |
                                 TEXBLENDARG_MODIFY_PARMS |
                                 TEXBLENDARG_DIFFUSE);
   i830->state.TexBlend[0][3] = (_3DSTATE_MAP_BLEND_ARG_CMD(0) |
                                 TEXPIPE_ALPHA |
                                 TEXBLEND_ARG1 |
                                 TEXBLENDARG_MODIFY_PARMS |
                                 TEXBLENDARG_DIFFUSE);

   i830->state.TexBlendWordsUsed[0] = 4;


   i830->state.Ctx[I830_CTXREG_VF] = 0;
   i830->state.Ctx[I830_CTXREG_VF2] = 0;

   i830->state.Ctx[I830_CTXREG_AA] = (_3DSTATE_AA_CMD |
                                      AA_LINE_ECAAR_WIDTH_ENABLE |
                                      AA_LINE_ECAAR_WIDTH_1_0 |
                                      AA_LINE_REGION_WIDTH_ENABLE |
                                      AA_LINE_REGION_WIDTH_1_0 |
                                      AA_LINE_DISABLE);

   i830->state.Ctx[I830_CTXREG_ENABLES_1] = (_3DSTATE_ENABLES_1_CMD |
                                             DISABLE_LOGIC_OP |
                                             DISABLE_STENCIL_TEST |
                                             DISABLE_DEPTH_BIAS |
                                             DISABLE_SPEC_ADD |
                                             DISABLE_FOG |
                                             DISABLE_ALPHA_TEST |
                                             DISABLE_COLOR_BLEND |
                                             DISABLE_DEPTH_TEST);

#if 000                         /* XXX all the stencil enable state is set in i830Enable(), right? */
   if (i830->intel.hw_stencil) {
      i830->state.Ctx[I830_CTXREG_ENABLES_2] = (_3DSTATE_ENABLES_2_CMD |
                                                ENABLE_STENCIL_WRITE |
                                                ENABLE_TEX_CACHE |
                                                ENABLE_DITHER |
                                                ENABLE_COLOR_MASK |
                                                /* set no color comps disabled */
                                                ENABLE_COLOR_WRITE |
                                                ENABLE_DEPTH_WRITE);
   }
   else
#endif
   {
      i830->state.Ctx[I830_CTXREG_ENABLES_2] = (_3DSTATE_ENABLES_2_CMD |
                                                DISABLE_STENCIL_WRITE |
                                                ENABLE_TEX_CACHE |
                                                ENABLE_DITHER |
                                                ENABLE_COLOR_MASK |
                                                /* set no color comps disabled */
                                                ENABLE_COLOR_WRITE |
                                                ENABLE_DEPTH_WRITE);
   }

   i830->state.Ctx[I830_CTXREG_STATE1] = (_3DSTATE_MODES_1_CMD |
                                          ENABLE_COLR_BLND_FUNC |
                                          BLENDFUNC_ADD |
                                          ENABLE_SRC_BLND_FACTOR |
                                          SRC_BLND_FACT(BLENDFACT_ONE) |
                                          ENABLE_DST_BLND_FACTOR |
                                          DST_BLND_FACT(BLENDFACT_ZERO));

   i830->state.Ctx[I830_CTXREG_STATE2] = (_3DSTATE_MODES_2_CMD |
                                          ENABLE_GLOBAL_DEPTH_BIAS |
                                          GLOBAL_DEPTH_BIAS(0) |
                                          ENABLE_ALPHA_TEST_FUNC |
                                          ALPHA_TEST_FUNC(COMPAREFUNC_ALWAYS)
                                          | ALPHA_REF_VALUE(0));

   i830->state.Ctx[I830_CTXREG_STATE3] = (_3DSTATE_MODES_3_CMD |
                                          ENABLE_DEPTH_TEST_FUNC |
                                          DEPTH_TEST_FUNC(COMPAREFUNC_LESS) |
                                          ENABLE_ALPHA_SHADE_MODE |
                                          ALPHA_SHADE_MODE(SHADE_MODE_LINEAR)
                                          | ENABLE_FOG_SHADE_MODE |
                                          FOG_SHADE_MODE(SHADE_MODE_LINEAR) |
                                          ENABLE_SPEC_SHADE_MODE |
                                          SPEC_SHADE_MODE(SHADE_MODE_LINEAR) |
                                          ENABLE_COLOR_SHADE_MODE |
                                          COLOR_SHADE_MODE(SHADE_MODE_LINEAR)
                                          | ENABLE_CULL_MODE | CULLMODE_NONE);

   i830->state.Ctx[I830_CTXREG_STATE4] = (_3DSTATE_MODES_4_CMD |
                                          ENABLE_LOGIC_OP_FUNC |
                                          LOGIC_OP_FUNC(LOGICOP_COPY) |
                                          ENABLE_STENCIL_TEST_MASK |
                                          STENCIL_TEST_MASK(0xff) |
                                          ENABLE_STENCIL_WRITE_MASK |
                                          STENCIL_WRITE_MASK(0xff));

   i830->state.Ctx[I830_CTXREG_STENCILTST] = (_3DSTATE_STENCIL_TEST_CMD |
                                              ENABLE_STENCIL_PARMS |
                                              STENCIL_FAIL_OP(STENCILOP_KEEP)
                                              |
                                              STENCIL_PASS_DEPTH_FAIL_OP
                                              (STENCILOP_KEEP) |
                                              STENCIL_PASS_DEPTH_PASS_OP
                                              (STENCILOP_KEEP) |
                                              ENABLE_STENCIL_TEST_FUNC |
                                              STENCIL_TEST_FUNC
                                              (COMPAREFUNC_ALWAYS) |
                                              ENABLE_STENCIL_REF_VALUE |
                                              STENCIL_REF_VALUE(0));

   i830->state.Ctx[I830_CTXREG_STATE5] = (_3DSTATE_MODES_5_CMD | FLUSH_TEXTURE_CACHE | ENABLE_SPRITE_POINT_TEX | SPRITE_POINT_TEX_OFF | ENABLE_FIXED_LINE_WIDTH | FIXED_LINE_WIDTH(0x2) |       /* 1.0 */
                                          ENABLE_FIXED_POINT_WIDTH |
                                          FIXED_POINT_WIDTH(1));

   i830->state.Ctx[I830_CTXREG_IALPHAB] = (_3DSTATE_INDPT_ALPHA_BLEND_CMD |
                                           DISABLE_INDPT_ALPHA_BLEND |
                                           ENABLE_ALPHA_BLENDFUNC |
                                           ABLENDFUNC_ADD);

   i830->state.Ctx[I830_CTXREG_FOGCOLOR] = (_3DSTATE_FOG_COLOR_CMD |
                                            FOG_COLOR_RED(0) |
                                            FOG_COLOR_GREEN(0) |
                                            FOG_COLOR_BLUE(0));

   i830->state.Ctx[I830_CTXREG_BLENDCOLOR0] = _3DSTATE_CONST_BLEND_COLOR_CMD;
   i830->state.Ctx[I830_CTXREG_BLENDCOLOR1] = 0;

   i830->state.Ctx[I830_CTXREG_MCSB0] = _3DSTATE_MAP_COORD_SETBIND_CMD;
   i830->state.Ctx[I830_CTXREG_MCSB1] = (TEXBIND_SET3(TEXCOORDSRC_VTXSET_3) |
                                         TEXBIND_SET2(TEXCOORDSRC_VTXSET_2) |
                                         TEXBIND_SET1(TEXCOORDSRC_VTXSET_1) |
                                         TEXBIND_SET0(TEXCOORDSRC_VTXSET_0));


   i830->state.Stipple[I830_STPREG_ST0] = _3DSTATE_STIPPLE;

   i830->state.Buffer[I830_DESTREG_DV0] = _3DSTATE_DST_BUF_VARS_CMD;
   i830->state.Buffer[I830_DESTREG_SENABLE] = (_3DSTATE_SCISSOR_ENABLE_CMD |
                                               DISABLE_SCISSOR_RECT);
   i830->state.Buffer[I830_DESTREG_SR0] = _3DSTATE_SCISSOR_RECT_0_CMD;
   i830->state.Buffer[I830_DESTREG_SR1] = 0;
   i830->state.Buffer[I830_DESTREG_SR2] = 0;
}


void
i830InitStateFuncs(struct dd_function_table *functions)
{
   functions->AlphaFunc = i830AlphaFunc;
   functions->BlendColor = i830BlendColor;
   functions->BlendEquationSeparate = i830BlendEquationSeparate;
   functions->BlendFuncSeparate = i830BlendFuncSeparate;
   functions->ColorMask = i830ColorMask;
   functions->CullFace = i830CullFaceFrontFace;
   functions->DepthFunc = i830DepthFunc;
   functions->DepthMask = i830DepthMask;
   functions->Enable = i830Enable;
   functions->Fogfv = i830Fogfv;
   functions->FrontFace = i830CullFaceFrontFace;
   functions->LightModelfv = i830LightModelfv;
   functions->LineWidth = i830LineWidth;
   functions->LogicOpcode = i830LogicOp;
   functions->PointSize = i830PointSize;
   functions->PolygonStipple = i830PolygonStipple;
   functions->Scissor = i830Scissor;
   functions->ShadeModel = i830ShadeModel;
   functions->StencilFuncSeparate = i830StencilFuncSeparate;
   functions->StencilMaskSeparate = i830StencilMaskSeparate;
   functions->StencilOpSeparate = i830StencilOpSeparate;
}

void
i830InitState(struct i830_context *i830)
{
   GLcontext *ctx = &i830->intel.ctx;

   i830_init_packets(i830);

   _mesa_init_driver_state(ctx);

   memcpy(&i830->initial, &i830->state, sizeof(i830->state));

   i830->current = &i830->state;
   i830->state.emitted = 0;
   i830->state.active = (I830_UPLOAD_INVARIENT |
                         I830_UPLOAD_TEXBLEND(0) |
                         I830_UPLOAD_STIPPLE |
                         I830_UPLOAD_CTX | I830_UPLOAD_BUFFERS);
}