attrib.c

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

   /* texture unit enables */
   for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
      if (ctx->Texture.Unit[i].Enabled != enable->Texture[i]) {
         ctx->Texture.Unit[i].Enabled = enable->Texture[i];
         if (ctx->Driver.Enable) {
            if (ctx->Driver.ActiveTexture) {
               (*ctx->Driver.ActiveTexture)(ctx, i);
            }
            (*ctx->Driver.Enable)( ctx, GL_TEXTURE_1D,
                             (GLboolean) (enable->Texture[i] & TEXTURE_1D_BIT) );
            (*ctx->Driver.Enable)( ctx, GL_TEXTURE_2D,
                             (GLboolean) (enable->Texture[i] & TEXTURE_2D_BIT) );
            (*ctx->Driver.Enable)( ctx, GL_TEXTURE_3D,
                             (GLboolean) (enable->Texture[i] & TEXTURE_3D_BIT) );
            if (ctx->Extensions.ARB_texture_cube_map)
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_CUBE_MAP_ARB,
                          (GLboolean) (enable->Texture[i] & TEXTURE_CUBE_BIT) );
            if (ctx->Extensions.NV_texture_rectangle)
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_RECTANGLE_NV,
                          (GLboolean) (enable->Texture[i] & TEXTURE_RECT_BIT) );
         }
      }

      if (ctx->Texture.Unit[i].TexGenEnabled != enable->TexGen[i]) {
         ctx->Texture.Unit[i].TexGenEnabled = enable->TexGen[i];
         if (ctx->Driver.Enable) {
            if (ctx->Driver.ActiveTexture) {
               (*ctx->Driver.ActiveTexture)(ctx, i);
            }
            if (enable->TexGen[i] & S_BIT)
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_GEN_S, GL_TRUE);
            else
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_GEN_S, GL_FALSE);
            if (enable->TexGen[i] & T_BIT)
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_GEN_T, GL_TRUE);
            else
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_GEN_T, GL_FALSE);
            if (enable->TexGen[i] & R_BIT)
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_GEN_R, GL_TRUE);
            else
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_GEN_R, GL_FALSE);
            if (enable->TexGen[i] & Q_BIT)
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_GEN_Q, GL_TRUE);
            else
               (*ctx->Driver.Enable)( ctx, GL_TEXTURE_GEN_Q, GL_FALSE);
         }
      }

      /* GL_SGI_texture_color_table */
      ctx->Texture.Unit[i].ColorTableEnabled = enable->TextureColorTable[i];
   }

   if (ctx->Driver.ActiveTexture) {
      (*ctx->Driver.ActiveTexture)(ctx, ctx->Texture.CurrentUnit);
   }
}


/**
 * Pop/restore texture attribute/group state.
 */
static void
pop_texture_group(GLcontext *ctx, struct texture_state *texstate)
{
   GLuint u;

   _mesa_lock_context_textures(ctx);

   for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
      const struct gl_texture_unit *unit = &texstate->Texture.Unit[u];
      GLuint tgt;

      _mesa_ActiveTextureARB(GL_TEXTURE0_ARB + u);
      _mesa_set_enable(ctx, GL_TEXTURE_1D,
                       (unit->Enabled & TEXTURE_1D_BIT) ? GL_TRUE : GL_FALSE);
      _mesa_set_enable(ctx, GL_TEXTURE_2D,
                       (unit->Enabled & TEXTURE_2D_BIT) ? GL_TRUE : GL_FALSE);
      _mesa_set_enable(ctx, GL_TEXTURE_3D,
                       (unit->Enabled & TEXTURE_3D_BIT) ? GL_TRUE : GL_FALSE);
      if (ctx->Extensions.ARB_texture_cube_map) {
         _mesa_set_enable(ctx, GL_TEXTURE_CUBE_MAP_ARB,
                     (unit->Enabled & TEXTURE_CUBE_BIT) ? GL_TRUE : GL_FALSE);
      }
      if (ctx->Extensions.NV_texture_rectangle) {
         _mesa_set_enable(ctx, GL_TEXTURE_RECTANGLE_NV,
                     (unit->Enabled & TEXTURE_RECT_BIT) ? GL_TRUE : GL_FALSE);
      }
      if (ctx->Extensions.SGI_texture_color_table) {
         _mesa_set_enable(ctx, GL_TEXTURE_COLOR_TABLE_SGI,
                          unit->ColorTableEnabled);
      }
      _mesa_TexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->EnvMode);
      _mesa_TexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, unit->EnvColor);
      _mesa_TexGeni(GL_S, GL_TEXTURE_GEN_MODE, unit->GenModeS);
      _mesa_TexGeni(GL_T, GL_TEXTURE_GEN_MODE, unit->GenModeT);
      _mesa_TexGeni(GL_R, GL_TEXTURE_GEN_MODE, unit->GenModeR);
      _mesa_TexGeni(GL_Q, GL_TEXTURE_GEN_MODE, unit->GenModeQ);
      _mesa_TexGenfv(GL_S, GL_OBJECT_PLANE, unit->ObjectPlaneS);
      _mesa_TexGenfv(GL_T, GL_OBJECT_PLANE, unit->ObjectPlaneT);
      _mesa_TexGenfv(GL_R, GL_OBJECT_PLANE, unit->ObjectPlaneR);
      _mesa_TexGenfv(GL_Q, GL_OBJECT_PLANE, unit->ObjectPlaneQ);
      /* Eye plane done differently to avoid re-transformation */
      {
         struct gl_texture_unit *destUnit = &ctx->Texture.Unit[u];
         COPY_4FV(destUnit->EyePlaneS, unit->EyePlaneS);
         COPY_4FV(destUnit->EyePlaneT, unit->EyePlaneT);
         COPY_4FV(destUnit->EyePlaneR, unit->EyePlaneR);
         COPY_4FV(destUnit->EyePlaneQ, unit->EyePlaneQ);
         if (ctx->Driver.TexGen) {
            ctx->Driver.TexGen(ctx, GL_S, GL_EYE_PLANE, unit->EyePlaneS);
            ctx->Driver.TexGen(ctx, GL_T, GL_EYE_PLANE, unit->EyePlaneT);
            ctx->Driver.TexGen(ctx, GL_R, GL_EYE_PLANE, unit->EyePlaneR);
            ctx->Driver.TexGen(ctx, GL_Q, GL_EYE_PLANE, unit->EyePlaneQ);
         }
      }
      _mesa_set_enable(ctx, GL_TEXTURE_GEN_S,
                       ((unit->TexGenEnabled & S_BIT) ? GL_TRUE : GL_FALSE));
      _mesa_set_enable(ctx, GL_TEXTURE_GEN_T,
                       ((unit->TexGenEnabled & T_BIT) ? GL_TRUE : GL_FALSE));
      _mesa_set_enable(ctx, GL_TEXTURE_GEN_R,
                       ((unit->TexGenEnabled & R_BIT) ? GL_TRUE : GL_FALSE));
      _mesa_set_enable(ctx, GL_TEXTURE_GEN_Q,
                       ((unit->TexGenEnabled & Q_BIT) ? GL_TRUE : GL_FALSE));
      if (ctx->Extensions.EXT_texture_lod_bias) {
         _mesa_TexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT,
                       GL_TEXTURE_LOD_BIAS_EXT, unit->LodBias);
      }
      if (ctx->Extensions.EXT_texture_env_combine ||
          ctx->Extensions.ARB_texture_env_combine) {
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB,
                       unit->Combine.ModeRGB);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA,
                       unit->Combine.ModeA);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB,
                       unit->Combine.SourceRGB[0]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB,
                       unit->Combine.SourceRGB[1]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB,
                       unit->Combine.SourceRGB[2]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA,
                       unit->Combine.SourceA[0]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA,
                       unit->Combine.SourceA[1]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA,
                       unit->Combine.SourceA[2]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB,
                       unit->Combine.OperandRGB[0]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB,
                       unit->Combine.OperandRGB[1]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB,
                       unit->Combine.OperandRGB[2]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA,
                       unit->Combine.OperandA[0]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA,
                       unit->Combine.OperandA[1]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA,
                       unit->Combine.OperandA[2]);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE,
                       1 << unit->Combine.ScaleShiftRGB);
         _mesa_TexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE,
                       1 << unit->Combine.ScaleShiftA);
      }

      /* Restore texture object state for each target */
      for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
         const struct gl_texture_object *obj = NULL;
         GLfloat bordColor[4];
         GLenum target;

         obj = &texstate->SavedObj[u][tgt];

         /* don't restore state for unsupported targets to prevent
          * raising GL errors.
          */
         if (obj->Target == GL_TEXTURE_CUBE_MAP_ARB &&
             !ctx->Extensions.ARB_texture_cube_map) {
            continue;
         }
         else if (obj->Target == GL_TEXTURE_RECTANGLE_NV &&
                  !ctx->Extensions.NV_texture_rectangle) {
            continue;
         }
         else if ((obj->Target == GL_TEXTURE_1D_ARRAY_EXT ||
                   obj->Target == GL_TEXTURE_2D_ARRAY_EXT) &&
                  !ctx->Extensions.MESA_texture_array) {
            continue;
         }

         target = obj->Target;

         _mesa_BindTexture(target, obj->Name);

         bordColor[0] = CHAN_TO_FLOAT(obj->BorderColor[0]);
         bordColor[1] = CHAN_TO_FLOAT(obj->BorderColor[1]);
         bordColor[2] = CHAN_TO_FLOAT(obj->BorderColor[2]);
         bordColor[3] = CHAN_TO_FLOAT(obj->BorderColor[3]);

         _mesa_TexParameterfv(target, GL_TEXTURE_BORDER_COLOR, bordColor);
         _mesa_TexParameterf(target, GL_TEXTURE_PRIORITY, obj->Priority);
         _mesa_TexParameteri(target, GL_TEXTURE_WRAP_S, obj->WrapS);
         _mesa_TexParameteri(target, GL_TEXTURE_WRAP_T, obj->WrapT);
         _mesa_TexParameteri(target, GL_TEXTURE_WRAP_R, obj->WrapR);
         _mesa_TexParameteri(target, GL_TEXTURE_MIN_FILTER, obj->MinFilter);
         _mesa_TexParameteri(target, GL_TEXTURE_MAG_FILTER, obj->MagFilter);
         _mesa_TexParameterf(target, GL_TEXTURE_MIN_LOD, obj->MinLod);
         _mesa_TexParameterf(target, GL_TEXTURE_MAX_LOD, obj->MaxLod);
         _mesa_TexParameterf(target, GL_TEXTURE_LOD_BIAS, obj->LodBias);
         _mesa_TexParameteri(target, GL_TEXTURE_BASE_LEVEL, obj->BaseLevel);
         if (target != GL_TEXTURE_RECTANGLE_ARB)
            _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, obj->MaxLevel);
         if (ctx->Extensions.EXT_texture_filter_anisotropic) {
            _mesa_TexParameterf(target, GL_TEXTURE_MAX_ANISOTROPY_EXT,
                                obj->MaxAnisotropy);
         }
         if (ctx->Extensions.SGIX_shadow) {
            _mesa_TexParameteri(target, GL_TEXTURE_COMPARE_SGIX,
                                obj->CompareFlag);
            _mesa_TexParameteri(target, GL_TEXTURE_COMPARE_OPERATOR_SGIX,
                                obj->CompareOperator);
         }
         if (ctx->Extensions.SGIX_shadow_ambient) {
            _mesa_TexParameterf(target, GL_SHADOW_AMBIENT_SGIX,
                                obj->ShadowAmbient);
         }
      }

      /* remove saved references to the texture objects */
      for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
         _mesa_reference_texobj(&texstate->SavedTexRef[u][tgt], NULL);
      }
   }

   _mesa_ActiveTextureARB(GL_TEXTURE0_ARB + texstate->Texture.CurrentUnit);

   _mesa_unlock_context_textures(ctx);
}


/*
 * This function is kind of long just because we have to call a lot
 * of device driver functions to update device driver state.
 *
 * XXX As it is now, most of the pop-code calls immediate-mode Mesa functions
 * in order to restore GL state.  This isn't terribly efficient but it
 * ensures that dirty flags and any derived state gets updated correctly.
 * We could at least check if the value to restore equals the current value
 * and then skip the Mesa call.
 */
void GLAPIENTRY
_mesa_PopAttrib(void)
{
   struct gl_attrib_node *attr, *next;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (ctx->AttribStackDepth == 0) {
      _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopAttrib" );
      return;
   }

   ctx->AttribStackDepth--;
   attr = ctx->AttribStack[ctx->AttribStackDepth];

   while (attr) {

      if (MESA_VERBOSE & VERBOSE_API) {
         _mesa_debug(ctx, "glPopAttrib %s\n",
                     _mesa_lookup_enum_by_nr(attr->kind));
      }

      switch (attr->kind) {
         case GL_ACCUM_BUFFER_BIT:
            {
               const struct gl_accum_attrib *accum;
               accum = (const struct gl_accum_attrib *) attr->data;
               _mesa_ClearAccum(accum->ClearColor[0],
                                accum->ClearColor[1],
                                accum->ClearColor[2],
                                accum->ClearColor[3]);
            }
            break;
         case GL_COLOR_BUFFER_BIT:
            {
               const struct gl_colorbuffer_attrib *color;
               color = (const struct gl_colorbuffer_attrib *) attr->data;
               _mesa_ClearIndex((GLfloat) color->ClearIndex);
               _mesa_ClearColor(color->ClearColor[0],
                                color->ClearColor[1],
                                color->ClearColor[2],
                                color->ClearColor[3]);
               _mesa_IndexMask(color->IndexMask);
               _mesa_ColorMask((GLboolean) (color->ColorMask[0] != 0),
                               (GLboolean) (color->ColorMask[1] != 0),
                               (GLboolean) (color->ColorMask[2] != 0),
                               (GLboolean) (color->ColorMask[3] != 0));
               {
                  /* Need to determine if more than one color output is
                   * specified.  If so, call glDrawBuffersARB, else call
                   * glDrawBuffer().  This is a subtle, but essential point