C++ ASSIGN_4V函数代码示例

/**
 * Set a program env parameter register.
 * \note Called from the GL API dispatcher.
 * Note, this function is also used by the GL_NV_vertex_program extension
 * (alias to ProgramParameterfNV)
 */
void GLAPIENTRY
_mesa_ProgramEnvParameter4fARB(GLenum target, GLuint index,
                               GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   FLUSH_VERTICES(ctx, _NEW_PROGRAM_CONSTANTS);

   if (target == GL_FRAGMENT_PROGRAM_ARB
       && ctx->Extensions.ARB_fragment_program) {
      if (index >= ctx->Const.FragmentProgram.MaxEnvParams) {
         _mesa_error(ctx, GL_INVALID_VALUE, "glProgramEnvParameter(index)");
         return;
      }
      ASSIGN_4V(ctx->FragmentProgram.Parameters[index], x, y, z, w);
   }
   else if (target == GL_VERTEX_PROGRAM_ARB /* == GL_VERTEX_PROGRAM_NV */
       && (ctx->Extensions.ARB_vertex_program || ctx->Extensions.NV_vertex_program)) {
      if (index >= ctx->Const.VertexProgram.MaxEnvParams) {
         _mesa_error(ctx, GL_INVALID_VALUE, "glProgramEnvParameter(index)");
         return;
      }
      ASSIGN_4V(ctx->VertexProgram.Parameters[index], x, y, z, w);
   }
   else {
      _mesa_error(ctx, GL_INVALID_ENUM, "glProgramEnvParameter(target)");
      return;
   }
}

/**
 * Load/initialize the vertex program registers.
 * This needs to be done per vertex.
 */
void
_mesa_init_vp_registers(GLcontext *ctx)
{
   GLuint i;

   /* Input registers get initialized from the current vertex attribs */
   MEMCPY(ctx->VertexProgram.Inputs, ctx->Current.Attrib,
          VERT_ATTRIB_MAX * 4 * sizeof(GLfloat));

   /* Output and temp regs are initialized to [0,0,0,1] */
   for (i = 0; i < MAX_NV_VERTEX_PROGRAM_OUTPUTS; i++) {
      ASSIGN_4V(ctx->VertexProgram.Outputs[i], 0.0F, 0.0F, 0.0F, 1.0F);
   }
   for (i = 0; i < MAX_NV_VERTEX_PROGRAM_TEMPS; i++) {
      ASSIGN_4V(ctx->VertexProgram.Temporaries[i], 0.0F, 0.0F, 0.0F, 1.0F);
   }

   /* The program parameters aren't touched */
   /* XXX: This should be moved to glBegin() time, but its safe (and slow!) 
    * here - Karl
    */
   if (ctx->VertexProgram.Current->Parameters) {
      /* Grab the state GL state and put into registers */
      _mesa_load_state_parameters(ctx, ctx->VertexProgram.Current->Parameters);
   }
}

/**
 * Initialize the context current raster position information.
 *
 * \param ctx GL context.
 *
 * Initialize the current raster position information in
 * __struct gl_contextRec::Current, and adds the extension entry points to the
 * dispatcher.
 */
void _mesa_init_rastpos( struct gl_context * ctx )
{
   ASSIGN_4V( ctx->Current.RasterPos, 0.0, 0.0, 0.0, 1.0 );
   ctx->Current.RasterDistance = 0.0;
   ASSIGN_4V( ctx->Current.RasterColor, 1.0, 1.0, 1.0, 1.0 );
   ASSIGN_4V( ctx->Current.RasterTexCoords, 0.0, 0.0, 0.0, 1.0 );
   ctx->Current.RasterPosValid = GL_TRUE;
}

/**
 * Initialize the context current raster position information.
 *
 * \param ctx GL context.
 *
 * Initialize the current raster position information in
 * __struct gl_contextRec::Current, and adds the extension entry points to the
 * dispatcher.
 */
void _mesa_init_rastpos( struct gl_context * ctx )
{
   unsigned i;

   ASSIGN_4V( ctx->Current.RasterPos, 0.0, 0.0, 0.0, 1.0 );
   ctx->Current.RasterDistance = 0.0;
   ASSIGN_4V( ctx->Current.RasterColor, 1.0, 1.0, 1.0, 1.0 );
   ASSIGN_4V( ctx->Current.RasterSecondaryColor, 0.0, 0.0, 0.0, 1.0 );
   for (i = 0; i < ARRAY_SIZE(ctx->Current.RasterTexCoords); i++)
      ASSIGN_4V( ctx->Current.RasterTexCoords[i], 0.0, 0.0, 0.0, 1.0 );
   ctx->Current.RasterPosValid = GL_TRUE;
}

/**
 * Initialize the context current raster position information.
 *
 * \param ctx GL context.
 *
 * Initialize the current raster position information in
 * __GLcontextRec::Current, and adds the extension entry points to the
 * dispatcher.
 */
void _mesa_init_rastpos( GLcontext * ctx )
{
   int i;

   ASSIGN_4V( ctx->Current.RasterPos, 0.0, 0.0, 0.0, 1.0 );
   ctx->Current.RasterDistance = 0.0;
   ASSIGN_4V( ctx->Current.RasterColor, 1.0, 1.0, 1.0, 1.0 );
   ASSIGN_4V( ctx->Current.RasterSecondaryColor, 0.0, 0.0, 0.0, 1.0 );
   ctx->Current.RasterIndex = 1.0;
   for (i=0; i<MAX_TEXTURE_UNITS; i++)
      ASSIGN_4V( ctx->Current.RasterTexCoords[i], 0.0, 0.0, 0.0, 1.0 );
   ctx->Current.RasterPosValid = GL_TRUE;
}

/**
 * Initialization of the context's Color attribute group.
 *
 * \param ctx GL context.
 *
 * Initializes the related fields in the context color attribute group,
 * __struct gl_contextRec::Color.
 */
void _mesa_init_color( struct gl_context * ctx )
{
   GLuint i;

   /* Color buffer group */
   ctx->Color.IndexMask = ~0u;
   memset(ctx->Color.ColorMask, 0xff, sizeof(ctx->Color.ColorMask));
   ctx->Color.ClearIndex = 0;
   ASSIGN_4V( ctx->Color.ClearColor.f, 0, 0, 0, 0 );
   ctx->Color.AlphaEnabled = GL_FALSE;
   ctx->Color.AlphaFunc = GL_ALWAYS;
   ctx->Color.AlphaRef = 0;
   ctx->Color.BlendEnabled = 0x0;
   for (i = 0; i < ARRAY_SIZE(ctx->Color.Blend); i++) {
      ctx->Color.Blend[i].SrcRGB = GL_ONE;
      ctx->Color.Blend[i].DstRGB = GL_ZERO;
      ctx->Color.Blend[i].SrcA = GL_ONE;
      ctx->Color.Blend[i].DstA = GL_ZERO;
      ctx->Color.Blend[i].EquationRGB = GL_FUNC_ADD;
      ctx->Color.Blend[i].EquationA = GL_FUNC_ADD;
   }
   ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 );
   ASSIGN_4V( ctx->Color.BlendColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
   ctx->Color.IndexLogicOpEnabled = GL_FALSE;
   ctx->Color.ColorLogicOpEnabled = GL_FALSE;
   ctx->Color.LogicOp = GL_COPY;
   ctx->Color.DitherFlag = GL_TRUE;

   /* GL_FRONT is not possible on GLES. Instead GL_BACK will render to either
    * the front or the back buffer depending on the config */
   if (ctx->Visual.doubleBufferMode || _mesa_is_gles(ctx)) {
      ctx->Color.DrawBuffer[0] = GL_BACK;
   }
   else {
      ctx->Color.DrawBuffer[0] = GL_FRONT;
   }

   ctx->Color.ClampFragmentColor = ctx->API == API_OPENGL_COMPAT ?
                                   GL_FIXED_ONLY_ARB : GL_FALSE;
   ctx->Color._ClampFragmentColor = GL_FALSE;
   ctx->Color.ClampReadColor = GL_FIXED_ONLY_ARB;

   /* GLES 1/2/3 behaves as though GL_FRAMEBUFFER_SRGB is always enabled
    * if EGL_KHR_gl_colorspace has been used to request sRGB.
    */
   ctx->Color.sRGBEnabled = _mesa_is_gles(ctx);

   ctx->Color.BlendCoherent = true;
}

void _mesa_init_fog( struct gl_context * ctx )
{
   /* Fog group */
   ctx->Fog.Enabled = GL_FALSE;
   ctx->Fog.Mode = GL_EXP;
   ASSIGN_4V( ctx->Fog.Color, 0.0, 0.0, 0.0, 0.0 );
   ASSIGN_4V( ctx->Fog.ColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
   ctx->Fog.Index = 0.0;
   ctx->Fog.Density = 1.0;
   ctx->Fog.Start = 0.0;
   ctx->Fog.End = 1.0;
   ctx->Fog.ColorSumEnabled = GL_FALSE;
   ctx->Fog.FogCoordinateSource = GL_FRAGMENT_DEPTH_EXT;
   ctx->Fog._Scale = 1.0f;
   ctx->Fog.FogDistanceMode = GL_EYE_PLANE_ABSOLUTE_NV;
}

void GLAPIENTRY
_mesa_Fogiv(GLenum pname, const GLint *params )
{
   GLfloat p[4];
   switch (pname) {
      case GL_FOG_MODE:
      case GL_FOG_DENSITY:
      case GL_FOG_START:
      case GL_FOG_END:
      case GL_FOG_INDEX:
      case GL_FOG_COORDINATE_SOURCE_EXT:
	 p[0] = (GLfloat) *params;
	 break;
      case GL_FOG_COLOR:
	 p[0] = INT_TO_FLOAT( params[0] );
	 p[1] = INT_TO_FLOAT( params[1] );
	 p[2] = INT_TO_FLOAT( params[2] );
	 p[3] = INT_TO_FLOAT( params[3] );
	 break;
      default:
         /* Error will be caught later in _mesa_Fogfv */
         ASSIGN_4V(p, 0.0F, 0.0F, 0.0F, 0.0F);
   }
   _mesa_Fogfv(pname, p);
}

/** 
 * Initialize the context transform attribute group.
 *
 * \param ctx GL context.
 *
 * \todo Move this to a new file with other 'transform' routines.
 */
void _mesa_init_transform( GLcontext *ctx )
{
   GLint i;

   /* Transformation group */
   ctx->Transform.MatrixMode = GL_MODELVIEW;
   ctx->Transform.Normalize = GL_FALSE;
   ctx->Transform.RescaleNormals = GL_FALSE;
   ctx->Transform.RasterPositionUnclipped = GL_FALSE;
   for (i=0;i<MAX_CLIP_PLANES;i++) {
      ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
   }
   ctx->Transform.ClipPlanesEnabled = 0;

   ASSIGN_4V( ctx->Transform.CullObjPos, 0.0, 0.0, 1.0, 0.0 );
   ASSIGN_4V( ctx->Transform.CullEyePos, 0.0, 0.0, 1.0, 0.0 );
}

static void GLAPIENTRY _mesa_noop_VertexAttrib2fNV( GLuint index, GLfloat x, GLfloat y )
{
   GET_CURRENT_CONTEXT(ctx);
   if (index < MAX_NV_VERTEX_PROGRAM_INPUTS) {
      ASSIGN_4V(ctx->Current.Attrib[index], x, y, 0, 1);
   }
   else
      _mesa_error( ctx, GL_INVALID_VALUE, "glVertexAttrib2fNV(index)" );
}

void GLAPIENTRY _mesa_noop_VertexAttrib2fARB( GLuint index, GLfloat x, GLfloat y )
{
   GET_CURRENT_CONTEXT(ctx);
   if (index < VERT_ATTRIB_MAX) {
      ASSIGN_4V(ctx->Current.Attrib[index], x, y, 0, 1);
   }
   else
      _mesa_error( ctx, GL_INVALID_ENUM, "glVertexAttrib2fARB" );
}

void GLAPIENTRY _mesa_noop_VertexAttrib4fvARB( GLuint index, const GLfloat *v )
{
   GET_CURRENT_CONTEXT(ctx);
   if (index < VERT_ATTRIB_MAX) {
      ASSIGN_4V(ctx->Current.Attrib[index], v[0], v[1], v[2], v[3]);
   }
   else
      _mesa_error( ctx, GL_INVALID_ENUM, "glVertexAttrib4fvARB" );
}

static void GLAPIENTRY _mesa_noop_VertexAttrib4fvNV( GLuint index, const GLfloat *v )
{
   GET_CURRENT_CONTEXT(ctx);
   if (index < MAX_NV_VERTEX_PROGRAM_INPUTS) {
      ASSIGN_4V(ctx->Current.Attrib[index], v[0], v[1], v[2], v[3]);
   }
   else
      _mesa_error( ctx, GL_INVALID_VALUE, "glVertexAttrib4fvNV(index)" );
}

static void GLAPIENTRY _mesa_noop_VertexAttrib4fvARB( GLuint index, const GLfloat *v )
{
   GET_CURRENT_CONTEXT(ctx);
   if (index < MAX_VERTEX_GENERIC_ATTRIBS) {
      ASSIGN_4V(ctx->Current.Attrib[VERT_ATTRIB_GENERIC0 + index], v[0], v[1], v[2], v[3]);
   }
   else
      _mesa_error( ctx, GL_INVALID_VALUE, "glVertexAttrib4fvARB(index)" );
}

static void GLAPIENTRY _mesa_noop_VertexAttrib2fARB( GLuint index, GLfloat x, GLfloat y )
{
   GET_CURRENT_CONTEXT(ctx);
   if (index < MAX_VERTEX_ATTRIBS) {
      ASSIGN_4V(ctx->Current.Attrib[VERT_ATTRIB_GENERIC0 + index], x, y, 0, 1);
   }
   else
      _mesa_error( ctx, GL_INVALID_VALUE, "glVertexAttrib2fARB(index)" );
}