attrib.c

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

                   * since GL_FRONT (for example) is illegal for the former
                   * function, but legal for the later.
                   */
                  GLboolean multipleBuffers = GL_FALSE;
                  if (ctx->Extensions.ARB_draw_buffers) {
                     GLuint i;
                     for (i = 1; i < ctx->Const.MaxDrawBuffers; i++) {
                        if (color->DrawBuffer[i] != GL_NONE) {
                           multipleBuffers = GL_TRUE;
                           break;
                        }
                     }
                  }
                  /* Call the API_level functions, not _mesa_drawbuffers()
                   * since we need to do error checking on the pop'd
                   * GL_DRAW_BUFFER.
                   * Ex: if GL_FRONT were pushed, but we're popping with a
                   * user FBO bound, GL_FRONT will be illegal and we'll need
                   * to record that error.  Per OpenGL ARB decision.
                   */
                  if (multipleBuffers)
                     _mesa_DrawBuffersARB(ctx->Const.MaxDrawBuffers,
                                          color->DrawBuffer);
                  else
                     _mesa_DrawBuffer(color->DrawBuffer[0]);
               }
               _mesa_set_enable(ctx, GL_ALPHA_TEST, color->AlphaEnabled);
               _mesa_AlphaFunc(color->AlphaFunc, color->AlphaRef);
               _mesa_set_enable(ctx, GL_BLEND, color->BlendEnabled);
               _mesa_BlendFuncSeparateEXT(color->BlendSrcRGB,
                                          color->BlendDstRGB,
                                          color->BlendSrcA,
                                          color->BlendDstA);
	       /* This special case is because glBlendEquationSeparateEXT
		* cannot take GL_LOGIC_OP as a parameter.
		*/
	       if ( color->BlendEquationRGB == color->BlendEquationA ) {
		  _mesa_BlendEquation(color->BlendEquationRGB);
	       }
	       else {
		  _mesa_BlendEquationSeparateEXT(color->BlendEquationRGB,
						 color->BlendEquationA);
	       }
               _mesa_BlendColor(color->BlendColor[0],
                                color->BlendColor[1],
                                color->BlendColor[2],
                                color->BlendColor[3]);
               _mesa_LogicOp(color->LogicOp);
               _mesa_set_enable(ctx, GL_COLOR_LOGIC_OP,
                                color->ColorLogicOpEnabled);
               _mesa_set_enable(ctx, GL_INDEX_LOGIC_OP,
                                color->IndexLogicOpEnabled);
               _mesa_set_enable(ctx, GL_DITHER, color->DitherFlag);
            }
            break;
         case GL_CURRENT_BIT:
	    FLUSH_CURRENT( ctx, 0 );
            MEMCPY( &ctx->Current, attr->data,
		    sizeof(struct gl_current_attrib) );
            break;
         case GL_DEPTH_BUFFER_BIT:
            {
               const struct gl_depthbuffer_attrib *depth;
               depth = (const struct gl_depthbuffer_attrib *) attr->data;
               _mesa_DepthFunc(depth->Func);
               _mesa_ClearDepth(depth->Clear);
               _mesa_set_enable(ctx, GL_DEPTH_TEST, depth->Test);
               _mesa_DepthMask(depth->Mask);
            }
            break;
         case GL_ENABLE_BIT:
            {
               const struct gl_enable_attrib *enable;
               enable = (const struct gl_enable_attrib *) attr->data;
               pop_enable_group(ctx, enable);
	       ctx->NewState |= _NEW_ALL;
            }
            break;
         case GL_EVAL_BIT:
            MEMCPY( &ctx->Eval, attr->data, sizeof(struct gl_eval_attrib) );
	    ctx->NewState |= _NEW_EVAL;
            break;
         case GL_FOG_BIT:
            {
               const struct gl_fog_attrib *fog;
               fog = (const struct gl_fog_attrib *) attr->data;
               _mesa_set_enable(ctx, GL_FOG, fog->Enabled);
               _mesa_Fogfv(GL_FOG_COLOR, fog->Color);
               _mesa_Fogf(GL_FOG_DENSITY, fog->Density);
               _mesa_Fogf(GL_FOG_START, fog->Start);
               _mesa_Fogf(GL_FOG_END, fog->End);
               _mesa_Fogf(GL_FOG_INDEX, fog->Index);
               _mesa_Fogi(GL_FOG_MODE, fog->Mode);
            }
            break;
         case GL_HINT_BIT:
            {
               const struct gl_hint_attrib *hint;
               hint = (const struct gl_hint_attrib *) attr->data;
               _mesa_Hint(GL_PERSPECTIVE_CORRECTION_HINT,
                          hint->PerspectiveCorrection );
               _mesa_Hint(GL_POINT_SMOOTH_HINT, hint->PointSmooth);
               _mesa_Hint(GL_LINE_SMOOTH_HINT, hint->LineSmooth);
               _mesa_Hint(GL_POLYGON_SMOOTH_HINT, hint->PolygonSmooth);
               _mesa_Hint(GL_FOG_HINT, hint->Fog);
               _mesa_Hint(GL_CLIP_VOLUME_CLIPPING_HINT_EXT,
                          hint->ClipVolumeClipping);
               if (ctx->Extensions.ARB_texture_compression)
                  _mesa_Hint(GL_TEXTURE_COMPRESSION_HINT_ARB,
                             hint->TextureCompression);
            }
            break;
         case GL_LIGHTING_BIT:
            {
               GLuint i;
               const struct gl_light_attrib *light;
               light = (const struct gl_light_attrib *) attr->data;
               /* lighting enable */
               _mesa_set_enable(ctx, GL_LIGHTING, light->Enabled);
               /* per-light state */
               if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top))
                  _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
	       
               for (i = 0; i < ctx->Const.MaxLights; i++) {
		  const struct gl_light *l = &light->Light[i];
                  _mesa_set_enable(ctx, GL_LIGHT0 + i, l->Enabled);
		  _mesa_light(ctx, i, GL_AMBIENT, l->Ambient);
		  _mesa_light(ctx, i, GL_DIFFUSE, l->Diffuse);
		  _mesa_light(ctx, i, GL_SPECULAR, l->Specular );
		  _mesa_light(ctx, i, GL_POSITION, l->EyePosition);
		  _mesa_light(ctx, i, GL_SPOT_DIRECTION, l->EyeDirection);
		  _mesa_light(ctx, i, GL_SPOT_EXPONENT, &l->SpotExponent);
		  _mesa_light(ctx, i, GL_SPOT_CUTOFF, &l->SpotCutoff);
		  _mesa_light(ctx, i, GL_CONSTANT_ATTENUATION,
                              &l->ConstantAttenuation);
		  _mesa_light(ctx, i, GL_LINEAR_ATTENUATION,
                              &l->LinearAttenuation);
		  _mesa_light(ctx, i, GL_QUADRATIC_ATTENUATION,
                              &l->QuadraticAttenuation);
               }
               /* light model */
               _mesa_LightModelfv(GL_LIGHT_MODEL_AMBIENT,
                                  light->Model.Ambient);
               _mesa_LightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER,
                                 (GLfloat) light->Model.LocalViewer);
               _mesa_LightModelf(GL_LIGHT_MODEL_TWO_SIDE,
                                 (GLfloat) light->Model.TwoSide);
               _mesa_LightModelf(GL_LIGHT_MODEL_COLOR_CONTROL,
                                 (GLfloat) light->Model.ColorControl);
               /* shade model */
               _mesa_ShadeModel(light->ShadeModel);
               /* color material */
               _mesa_ColorMaterial(light->ColorMaterialFace,
                                   light->ColorMaterialMode);
               _mesa_set_enable(ctx, GL_COLOR_MATERIAL,
                                light->ColorMaterialEnabled);
               /* materials */
               MEMCPY(&ctx->Light.Material, &light->Material,
                      sizeof(struct gl_material));
            }
            break;
         case GL_LINE_BIT:
            {
               const struct gl_line_attrib *line;
               line = (const struct gl_line_attrib *) attr->data;
               _mesa_set_enable(ctx, GL_LINE_SMOOTH, line->SmoothFlag);
               _mesa_set_enable(ctx, GL_LINE_STIPPLE, line->StippleFlag);
               _mesa_LineStipple(line->StippleFactor, line->StipplePattern);
               _mesa_LineWidth(line->Width);
            }
            break;
         case GL_LIST_BIT:
            MEMCPY( &ctx->List, attr->data, sizeof(struct gl_list_attrib) );
            break;
         case GL_PIXEL_MODE_BIT:
            MEMCPY( &ctx->Pixel, attr->data, sizeof(struct gl_pixel_attrib) );
            /* XXX what other pixel state needs to be set by function calls? */
            _mesa_ReadBuffer(ctx->Pixel.ReadBuffer);
	    ctx->NewState |= _NEW_PIXEL;
            break;
         case GL_POINT_BIT:
            {
               const struct gl_point_attrib *point;
               point = (const struct gl_point_attrib *) attr->data;
               _mesa_PointSize(point->Size);
               _mesa_set_enable(ctx, GL_POINT_SMOOTH, point->SmoothFlag);
               if (ctx->Extensions.EXT_point_parameters) {
                  _mesa_PointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
                                            point->Params);
                  _mesa_PointParameterfEXT(GL_POINT_SIZE_MIN_EXT,
                                           point->MinSize);
                  _mesa_PointParameterfEXT(GL_POINT_SIZE_MAX_EXT,
                                           point->MaxSize);
                  _mesa_PointParameterfEXT(GL_POINT_FADE_THRESHOLD_SIZE_EXT,
                                           point->Threshold);
               }
               if (ctx->Extensions.NV_point_sprite
		   || ctx->Extensions.ARB_point_sprite) {
                  GLuint u;
                  for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
                     _mesa_TexEnvi(GL_POINT_SPRITE_NV, GL_COORD_REPLACE_NV,
                                   (GLint) point->CoordReplace[u]);
                  }
                  _mesa_set_enable(ctx, GL_POINT_SPRITE_NV,point->PointSprite);
                  if (ctx->Extensions.NV_point_sprite)
                     _mesa_PointParameteriNV(GL_POINT_SPRITE_R_MODE_NV,
                                          ctx->Point.SpriteRMode);
                  _mesa_PointParameterfEXT(GL_POINT_SPRITE_COORD_ORIGIN,
                                           (GLfloat)ctx->Point.SpriteOrigin);
               }
            }
            break;
         case GL_POLYGON_BIT:
            {
               const struct gl_polygon_attrib *polygon;
               polygon = (const struct gl_polygon_attrib *) attr->data;
               _mesa_CullFace(polygon->CullFaceMode);
               _mesa_FrontFace(polygon->FrontFace);
               _mesa_PolygonMode(GL_FRONT, polygon->FrontMode);
               _mesa_PolygonMode(GL_BACK, polygon->BackMode);
               _mesa_PolygonOffset(polygon->OffsetFactor,
                                   polygon->OffsetUnits);
               _mesa_set_enable(ctx, GL_POLYGON_SMOOTH, polygon->SmoothFlag);
               _mesa_set_enable(ctx, GL_POLYGON_STIPPLE, polygon->StippleFlag);
               _mesa_set_enable(ctx, GL_CULL_FACE, polygon->CullFlag);
               _mesa_set_enable(ctx, GL_POLYGON_OFFSET_POINT,
                                polygon->OffsetPoint);
               _mesa_set_enable(ctx, GL_POLYGON_OFFSET_LINE,
                                polygon->OffsetLine);
               _mesa_set_enable(ctx, GL_POLYGON_OFFSET_FILL,
                                polygon->OffsetFill);
            }
            break;
	 case GL_POLYGON_STIPPLE_BIT:
	    MEMCPY( ctx->PolygonStipple, attr->data, 32*sizeof(GLuint) );
	    ctx->NewState |= _NEW_POLYGONSTIPPLE;
	    if (ctx->Driver.PolygonStipple)
	       ctx->Driver.PolygonStipple( ctx, (const GLubyte *) attr->data );
	    break;
         case GL_SCISSOR_BIT:
            {
               const struct gl_scissor_attrib *scissor;
               scissor = (const struct gl_scissor_attrib *) attr->data;
               _mesa_Scissor(scissor->X, scissor->Y,
                             scissor->Width, scissor->Height);
               _mesa_set_enable(ctx, GL_SCISSOR_TEST, scissor->Enabled);
            }
            break;
         case GL_STENCIL_BUFFER_BIT:
            {
               const struct gl_stencil_attrib *stencil;
               stencil = (const struct gl_stencil_attrib *) attr->data;
               _mesa_set_enable(ctx, GL_STENCIL_TEST, stencil->Enabled);
               _mesa_ClearStencil(stencil->Clear);
               if (ctx->Extensions.EXT_stencil_two_side) {
                  _mesa_set_enable(ctx, GL_STENCIL_TEST_TWO_SIDE_EXT,
                                   stencil->TestTwoSide);
                  _mesa_ActiveStencilFaceEXT(stencil->ActiveFace
                                             ? GL_BACK : GL_FRONT);
               }
               /* front state */
               _mesa_StencilFuncSeparate(GL_FRONT,
                                         stencil->Function[0],
                                         stencil->Ref[0],
                                         stencil->ValueMask[0]);
               _mesa_StencilMaskSeparate(GL_FRONT, stencil->WriteMask[0]);
               _mesa_StencilOpSeparate(GL_FRONT, stencil->FailFunc[0],
                                       stencil->ZFailFunc[0],
                                       stencil->ZPassFunc[0]);
               /* back state */
               _mesa_StencilFuncSeparate(GL_BACK,
                                         stencil->Function[1],
                                         stencil->Ref[1],
                                         stencil->ValueMask[1]);
               _mesa_StencilMaskSeparate(GL_BACK, stencil->WriteMask[1]);
               _mesa_StencilOpSeparate(GL_BACK, stencil->FailFunc[1],
                                       stencil->ZFailFunc[1],
                                       stencil->ZPassFunc[1]);
            }
            break;
         case GL_TRANSFORM_BIT:
            {
               GLuint i;
               const struct gl_transform_attrib *xform;
               xform = (const struct gl_transform_attrib *) attr->data;
               _mesa_MatrixMode(xform->MatrixMode);
               if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
                  _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );

               /* restore clip planes */
               for (i = 0; i < MAX_CLIP_PLANES; i++) {
                  const GLuint mask = 1 << 1;
                  const GLfloat *eyePlane = xform->EyeUserPlane[i];
                  COPY_4V(ctx->Transform.EyeUserPlane[i], eyePlane);
                  if (xform->ClipPlanesEnabled & mask) {
                     _mesa_set_enable(ctx, GL_CLIP_PLANE0 + i, GL_TRUE);
                  }
                  else {
                     _mesa_set_enable(ctx, GL_CLIP_PLANE0 + i, GL_FALSE);
                  }