i915_state.c

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

   }
}


/* =============================================================
 * Color masks
 */

static void
i915ColorMask(GLcontext * ctx,
              GLboolean r, GLboolean g, GLboolean b, GLboolean a)
{
   struct i915_context *i915 = I915_CONTEXT(ctx);
   GLuint tmp = i915->state.Ctx[I915_CTXREG_LIS5] & ~S5_WRITEDISABLE_MASK;

   DBG("%s r(%d) g(%d) b(%d) a(%d)\n", __FUNCTION__, r, g, b,
       a);

   if (!r)
      tmp |= S5_WRITEDISABLE_RED;
   if (!g)
      tmp |= S5_WRITEDISABLE_GREEN;
   if (!b)
      tmp |= S5_WRITEDISABLE_BLUE;
   if (!a)
      tmp |= S5_WRITEDISABLE_ALPHA;

   if (tmp != i915->state.Ctx[I915_CTXREG_LIS5]) {
      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
      i915->state.Ctx[I915_CTXREG_LIS5] = tmp;
   }
}

static void
update_specular(GLcontext * ctx)
{
   /* A hack to trigger the rebuild of the fragment program.
    */
   intel_context(ctx)->NewGLState |= _NEW_TEXTURE;
}

static void
i915LightModelfv(GLcontext * ctx, GLenum pname, const GLfloat * param)
{
   DBG("%s\n", __FUNCTION__);
   
   if (pname == GL_LIGHT_MODEL_COLOR_CONTROL) {
      update_specular(ctx);
   }
}

static void
i915ShadeModel(GLcontext * ctx, GLenum mode)
{
   struct i915_context *i915 = I915_CONTEXT(ctx);
   I915_STATECHANGE(i915, I915_UPLOAD_CTX);

   if (mode == GL_SMOOTH) {
      i915->state.Ctx[I915_CTXREG_LIS4] &= ~(S4_FLATSHADE_ALPHA |
                                             S4_FLATSHADE_COLOR |
                                             S4_FLATSHADE_SPECULAR);
   }
   else {
      i915->state.Ctx[I915_CTXREG_LIS4] |= (S4_FLATSHADE_ALPHA |
                                            S4_FLATSHADE_COLOR |
                                            S4_FLATSHADE_SPECULAR);
   }
}

/* =============================================================
 * Fog
 */
void
i915_update_fog(GLcontext * ctx)
{
   struct i915_context *i915 = I915_CONTEXT(ctx);
   GLenum mode;
   GLboolean enabled;
   GLboolean try_pixel_fog;

   if (ctx->FragmentProgram._Active) {
      /* Pull in static fog state from program */
      mode = ctx->FragmentProgram._Current->FogOption;
      enabled = (mode != GL_NONE);
      try_pixel_fog = 0;
   }
   else {
      enabled = ctx->Fog.Enabled;
      mode = ctx->Fog.Mode;
#if 0
      /* XXX - DISABLED -- Need ortho fallback */
      try_pixel_fog = (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT
                       && ctx->Hint.Fog == GL_NICEST);
#else
      try_pixel_fog = 0;
#endif
   }

   if (!enabled) {
      i915->vertex_fog = I915_FOG_NONE;
   }
   else if (try_pixel_fog) {
      I915_STATECHANGE(i915, I915_UPLOAD_FOG);
      i915->state.Fog[I915_FOGREG_MODE1] &= ~FMC1_FOGFUNC_MASK;
      i915->vertex_fog = I915_FOG_PIXEL;

      switch (mode) {
      case GL_LINEAR:
         if (ctx->Fog.End <= ctx->Fog.Start) {
            /* XXX - this won't work with fragment programs.  Need to
             * either fallback or append fog instructions to end of
             * program in the case of linear fog.
             */
            printf("vertex fog!\n");
            i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_VERTEX;
            i915->vertex_fog = I915_FOG_VERTEX;
         }
         else {
            GLfloat c2 = 1.0 / (ctx->Fog.End - ctx->Fog.Start);
            GLfloat c1 = ctx->Fog.End * c2;

            i915->state.Fog[I915_FOGREG_MODE1] &= ~FMC1_C1_MASK;
            i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_PIXEL_LINEAR;
            i915->state.Fog[I915_FOGREG_MODE1] |=
               ((GLuint) (c1 * FMC1_C1_ONE)) & FMC1_C1_MASK;

            if (i915->state.Fog[I915_FOGREG_MODE1] & FMC1_FOGINDEX_Z) {
               i915->state.Fog[I915_FOGREG_MODE2]
                  = (GLuint) (c2 * FMC2_C2_ONE);
            }
            else {
               fi_type fi;
               fi.f = c2;
               i915->state.Fog[I915_FOGREG_MODE2] = fi.i;
            }
         }
         break;
      case GL_EXP:
         i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_PIXEL_EXP;
         break;
      case GL_EXP2:
         i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_PIXEL_EXP2;
         break;
      default:
         break;
      }
   }
   else { /* if (i915->vertex_fog != I915_FOG_VERTEX) */
      I915_STATECHANGE(i915, I915_UPLOAD_FOG);
      i915->state.Fog[I915_FOGREG_MODE1] &= ~FMC1_FOGFUNC_MASK;
      i915->state.Fog[I915_FOGREG_MODE1] |= FMC1_FOGFUNC_VERTEX;
      i915->vertex_fog = I915_FOG_VERTEX;
   }

   I915_STATECHANGE(i915, I915_UPLOAD_CTX);
   I915_ACTIVESTATE(i915, I915_UPLOAD_FOG, enabled);
   if (enabled)
      i915->state.Ctx[I915_CTXREG_LIS5] |= S5_FOG_ENABLE;
   else
      i915->state.Ctx[I915_CTXREG_LIS5] &= ~S5_FOG_ENABLE;

   /* Always enable pixel fog.  Vertex fog using fog coord will conflict
    * with fog code appended onto fragment program.
    */
    _tnl_allow_vertex_fog( ctx, 0 );
    _tnl_allow_pixel_fog( ctx, 1 );
}

static void
i915Fogfv(GLcontext * ctx, GLenum pname, const GLfloat * param)
{
   struct i915_context *i915 = I915_CONTEXT(ctx);

   switch (pname) {
   case GL_FOG_COORDINATE_SOURCE_EXT:
   case GL_FOG_MODE:
   case GL_FOG_START:
   case GL_FOG_END:
      break;

   case GL_FOG_DENSITY:
      I915_STATECHANGE(i915, I915_UPLOAD_FOG);

      if (i915->state.Fog[I915_FOGREG_MODE1] & FMC1_FOGINDEX_Z) {
         i915->state.Fog[I915_FOGREG_MODE3] =
            (GLuint) (ctx->Fog.Density * FMC3_D_ONE);
      }
      else {
         fi_type fi;
         fi.f = ctx->Fog.Density;
         i915->state.Fog[I915_FOGREG_MODE3] = fi.i;
      }
      break;

   case GL_FOG_COLOR:
      I915_STATECHANGE(i915, I915_UPLOAD_FOG);
      i915->state.Fog[I915_FOGREG_COLOR] =
         (_3DSTATE_FOG_COLOR_CMD |
          ((GLubyte) (ctx->Fog.Color[0] * 255.0F) << 16) |
          ((GLubyte) (ctx->Fog.Color[1] * 255.0F) << 8) |
          ((GLubyte) (ctx->Fog.Color[2] * 255.0F) << 0));
      break;

   default:
      break;
   }
}

static void
i915Hint(GLcontext * ctx, GLenum target, GLenum state)
{
   switch (target) {
   case GL_FOG_HINT:
      break;
   default:
      break;
   }
}

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

static void
i915Enable(GLcontext * ctx, GLenum cap, GLboolean state)
{
   struct i915_context *i915 = I915_CONTEXT(ctx);

   switch (cap) {
   case GL_TEXTURE_2D:
      break;

   case GL_LIGHTING:
   case GL_COLOR_SUM:
      update_specular(ctx);
      break;

   case GL_ALPHA_TEST:
      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
      if (state)
         i915->state.Ctx[I915_CTXREG_LIS6] |= S6_ALPHA_TEST_ENABLE;
      else
         i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_ALPHA_TEST_ENABLE;
      break;

   case GL_BLEND:
      i915EvalLogicOpBlendState(ctx);
      break;

   case GL_COLOR_LOGIC_OP:
      i915EvalLogicOpBlendState(ctx);

      /* Logicop doesn't seem to work at 16bpp:
       */
      if (ctx->Visual.rgbBits == 16)
         FALLBACK(&i915->intel, I915_FALLBACK_LOGICOP, state);
      break;

   case GL_FRAGMENT_PROGRAM_ARB:
      break;

   case GL_DITHER:
      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
      if (state)
         i915->state.Ctx[I915_CTXREG_LIS5] |= S5_COLOR_DITHER_ENABLE;
      else
         i915->state.Ctx[I915_CTXREG_LIS5] &= ~S5_COLOR_DITHER_ENABLE;
      break;

   case GL_DEPTH_TEST:
      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
      if (state)
         i915->state.Ctx[I915_CTXREG_LIS6] |= S6_DEPTH_TEST_ENABLE;
      else
         i915->state.Ctx[I915_CTXREG_LIS6] &= ~S6_DEPTH_TEST_ENABLE;

      i915DepthMask(ctx, ctx->Depth.Mask);
      break;

   case GL_SCISSOR_TEST:
      I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
      if (state)
         i915->state.Buffer[I915_DESTREG_SENABLE] =
            (_3DSTATE_SCISSOR_ENABLE_CMD | ENABLE_SCISSOR_RECT);
      else
         i915->state.Buffer[I915_DESTREG_SENABLE] =
            (_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
      break;

   case GL_LINE_SMOOTH:
      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
      if (state)
         i915->state.Ctx[I915_CTXREG_LIS4] |= S4_LINE_ANTIALIAS_ENABLE;
      else
         i915->state.Ctx[I915_CTXREG_LIS4] &= ~S4_LINE_ANTIALIAS_ENABLE;
      break;

   case GL_FOG:
      break;

   case GL_CULL_FACE:
      i915CullFaceFrontFace(ctx, 0);
      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) {
            I915_STATECHANGE(i915, I915_UPLOAD_CTX);
            if (state)
               i915->state.Ctx[I915_CTXREG_LIS5] |= (S5_STENCIL_TEST_ENABLE |
                                                     S5_STENCIL_WRITE_ENABLE);
            else
               i915->state.Ctx[I915_CTXREG_LIS5] &= ~(S5_STENCIL_TEST_ENABLE |
                                                      S5_STENCIL_WRITE_ENABLE);
         }
         else {
            FALLBACK(&i915->intel, I915_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 (i915->intel.hw_stipple &&
          i915->intel.reduced_primitive == GL_TRIANGLES) {
         I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
         if (state)
            i915->state.Stipple[I915_STPREG_ST1] |= ST1_ENABLE;
         else
            i915->state.Stipple[I915_STPREG_ST1] &= ~ST1_ENABLE;
      }
      break;

   case GL_POLYGON_SMOOTH:
      break;

   case GL_POINT_SMOOTH:
      break;

   default:
      ;
   }
}


static void
i915_init_packets(struct i915_context *i915)
{
   /* Zero all state */
   memset(&i915->state, 0, sizeof(i915->state));


   {
      I915_STATECHANGE(i915, I915_UPLOAD_CTX);
      /* Probably don't want to upload all this stuff every time one 
       * piece changes.
       */
      i915->state.Ctx[I915_CTXREG_LI] = (_3DSTATE_LOAD_STATE_IMMEDIATE_1 |
                                         I1_LOAD_S(2) |
                                         I1_LOAD_S(4) |
                                         I1_LOAD_S(5) | I1_LOAD_S(6) | (3));
      i915->state.Ctx[I915_CTXREG_LIS2] = 0;
      i915->state.Ctx[I915_CTXREG_LIS4] = 0;
      i915->state.Ctx[I915_CTXREG_LIS5] = 0;

      if (i915->intel.ctx.Visual.rgbBits == 16)
         i915->state.Ctx[I915_CTXREG_LIS5] |= S5_COLOR_DITHER_ENABLE;


      i915->state.Ctx[I915_CTXREG_LIS6] = (S6_COLOR_WRITE_ENABLE |
                                           (2 << S6_TRISTRIP_PV_SHIFT));

      i915->state.Ctx[I915_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));

      i915->state.Ctx[I915_CTXREG_IAB] =
         (_3DSTATE_INDEPENDENT_ALPHA_BLEND_CMD | IAB_MODIFY_ENABLE |
          IAB_MODIFY_FUNC | IAB_MODIFY_SRC_FACTOR | IAB_MODIFY_DST_FACTOR);

      i915->state.Ctx[I915_CTXREG_BLENDCOLOR0] =
         _3DSTATE_CONST_BLEND_COLOR_CMD;
      i915->state.Ctx[I915_CTXREG_BLENDCOLOR1] = 0;

   }

   {
      I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
      i915->state.Stipple[I915_STPREG_ST0] = _3DSTATE_STIPPLE;
   }


   {
      I915_STATECHANGE(i915, I915_UPLOAD_FOG);
      i915->state.Fog[I915_FOGREG_MODE0] = _3DSTATE_FOG_MODE_CMD;
      i915->state.Fog[I915_FOGREG_MODE1] = (FMC1_FOGFUNC_MODIFY_ENABLE |
                                            FMC1_FOGFUNC_VERTEX |
                                            FMC1_FOGINDEX_MODIFY_ENABLE |
                                            FMC1_FOGINDEX_W |
                                            FMC1_C1_C2_MODIFY_ENABLE |
                                            FMC1_DENSITY_MODIFY_ENABLE);
      i915->state.Fog[I915_FOGREG_COLOR] = _3DSTATE_FOG_COLOR_CMD;
   }

   {
      i915->state.Buffer[I915_DESTREG_DV0] = _3DSTATE_DST_BUF_VARS_CMD;

      /* scissor */
      i915->state.Buffer[I915_DESTREG_SENABLE] =
         (_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
      i915->state.Buffer[I915_DESTREG_SR0] = _3DSTATE_SCISSOR_RECT_0_CMD;
      i915->state.Buffer[I915_DESTREG_SR1] = 0;
      i915->state.Buffer[I915_DESTREG_SR2] = 0;
   }


#if 0
   {
      I915_STATECHANGE(i915, I915_UPLOAD_DEFAULTS);
      i915->state.Default[I915_DEFREG_C0] = _3DSTATE_DEFAULT_DIFFUSE;
      i915->state.Default[I915_DEFREG_C1] = 0;
      i915->state.Default[I915_DEFREG_S0] = _3DSTATE_DEFAULT_SPECULAR;
      i915->state.Default[I915_DEFREG_S1] = 0;
      i915->state.Default[I915_DEFREG_Z0] = _3DSTATE_DEFAULT_Z;
      i915->state.Default[I915_DEFREG_Z1] = 0;
   }
#endif


   /* These will be emitted every at the head of every buffer, unless
    * we get hardware contexts working.
    */
   i915->state.active = (I915_UPLOAD_PROGRAM |
                         I915_UPLOAD_STIPPLE |
                         I915_UPLOAD_CTX |
                         I915_UPLOAD_BUFFERS | I915_UPLOAD_INVARIENT);
}

void
i915InitStateFunctions(struct dd_function_table *functions)
{
   functions->AlphaFunc = i915AlphaFunc;
   functions->BlendColor = i915BlendColor;
   functions->BlendEquationSeparate = i915BlendEquationSeparate;
   functions->BlendFuncSeparate = i915BlendFuncSeparate;
   functions->ColorMask = i915ColorMask;
   functions->CullFace = i915CullFaceFrontFace;
   functions->DepthFunc = i915DepthFunc;
   functions->DepthMask = i915DepthMask;
   functions->Enable = i915Enable;
   functions->Fogfv = i915Fogfv;
   functions->FrontFace = i915CullFaceFrontFace;
   functions->Hint = i915Hint;
   functions->LightModelfv = i915LightModelfv;
   functions->LineWidth = i915LineWidth;
   functions->LogicOpcode = i915LogicOp;
   functions->PointSize = i915PointSize;
   functions->PolygonStipple = i915PolygonStipple;
   functions->Scissor = i915Scissor;
   functions->ShadeModel = i915ShadeModel;
   functions->StencilFuncSeparate = i915StencilFuncSeparate;
   functions->StencilMaskSeparate = i915StencilMaskSeparate;
   functions->StencilOpSeparate = i915StencilOpSeparate;
}


void
i915InitState(struct i915_context *i915)
{
   GLcontext *ctx = &i915->intel.ctx;

   i915_init_packets(i915);

   _mesa_init_driver_state(ctx);

   memcpy(&i915->initial, &i915->state, sizeof(i915->state));
   i915->current = &i915->state;
}