C++ GLfloat函数代码示例

//.........这里部分代码省略.........
    else if (noiseTexture >= 0 && BZDBCache::texture && renderer.useQuality() == 0)
		{
      glEnable(GL_TEXTURE_2D);
      tm.bind(noiseTexture);

      glBegin(GL_QUADS);
				glTexCoord2f(0,0);
				glVertex2f(-range,-range);
				glTexCoord2f(1,0);
				glVertex2f( range,-range);
				glTexCoord2f(1,1);
				glVertex2f( range, range);
				glTexCoord2f(0,1);
				glVertex2f(-range, range);
      glEnd();

      glDisable(GL_TEXTURE_2D);
    }
    if (decay > 0.015f)
			decay *= 0.5f;
  }
	else if (myTank)  // only draw if there's a local player
	{
    // if decay is sufficiently small then boost it so it's more
    // likely a jammed radar will get a few good frames closely
    // spaced in time.  value of 1 guarantees at least two good
    // frames in a row.
    if (decay <= 0.015f)
			decay = 1.0f;
    else
			decay *= 0.5f;

    // get size of pixel in model space (assumes radar is square)
    ps = 2.0f * range / GLfloat(w);

    // relative to my tank
    const LocalPlayer* myTank = LocalPlayer::getMyTank();
    const float* pos = myTank->getPosition();
    float angle = myTank->getAngle();

    // draw the view angle blewow stuff
    // view frustum edges
    glColor3f(1.0f, 0.625f, 0.125f);
    const float fovx = renderer.getViewFrustum().getFOVx();
    const float viewWidth = range * tanf(0.5f * fovx);
    glBegin(GL_LINE_STRIP);
			glVertex2f(-viewWidth, range);
			glVertex2f(0.0f, 0.0f);
			glVertex2f(viewWidth, range);
    glEnd();

    glPushMatrix();
    glRotatef(90.0f - angle * 180.0f / M_PI, 0.0f, 0.0f, 1.0f);
    glPushMatrix();
    glTranslatef(-pos[0], -pos[1], 0.0f);

    // Redraw buildings
    makeList( renderer);

    // draw my shots
    int maxShots = world.getMaxShots();
    int i;
    float muzzleHeight = BZDB.eval(StateDatabase::BZDB_MUZZLEHEIGHT);
    for (i = 0; i < maxShots; i++)
		{
      const ShotPath* shot = myTank->getShot(i);

void
Canvas::DrawCircle(int x, int y, unsigned radius)
{
#ifdef USE_GLSL
  OpenGL::solid_shader->Use();
#endif

  if (IsPenOverBrush() && pen.GetWidth() > 2) {
    ScopeVertexPointer vp;
    GLDonutVertices vertices(x, y,
                             radius - pen.GetWidth() / 2,
                             radius + pen.GetWidth() / 2);
    if (!brush.IsHollow()) {
      vertices.BindInnerCircle(vp);
      brush.Set();
      glDrawArrays(GL_TRIANGLE_FAN, 0, vertices.CIRCLE_SIZE);
    }
    vertices.Bind(vp);
    pen.Bind();
    glDrawArrays(GL_TRIANGLE_STRIP, 0, vertices.SIZE);
    pen.Unbind();
  } else {
    GLFallbackArrayBuffer &buffer = radius < 16
      ? *OpenGL::small_circle_buffer
      : *OpenGL::circle_buffer;
    const unsigned n = radius < 16
      ? OpenGL::SMALL_CIRCLE_SIZE
      : OpenGL::CIRCLE_SIZE;

    const FloatPoint *const points = (const FloatPoint *)buffer.BeginRead();
    const ScopeVertexPointer vp(points);

#ifdef USE_GLSL
    glm::mat4 matrix2 = glm::scale(glm::translate(glm::mat4(),
                                                  glm::vec3(x, y, 0)),
                                   glm::vec3(GLfloat(radius), GLfloat(radius),
                                             1.));
    glUniformMatrix4fv(OpenGL::solid_modelview, 1, GL_FALSE,
                       glm::value_ptr(matrix2));
#else
    glPushMatrix();

#ifdef HAVE_GLES
    glTranslatex((GLfixed)x << 16, (GLfixed)y << 16, 0);
    glScalex((GLfixed)radius << 16, (GLfixed)radius << 16, (GLfixed)1 << 16);
#else
    glTranslatef(x, y, 0.);
    glScalef(radius, radius, 1.);
#endif
#endif

    if (!brush.IsHollow()) {
      brush.Set();
      glDrawArrays(GL_TRIANGLE_FAN, 0, n);
    }

    if (IsPenOverBrush()) {
      pen.Bind();
      glDrawArrays(GL_LINE_LOOP, 0, n);
      pen.Unbind();
    }

#ifdef USE_GLSL
    glUniformMatrix4fv(OpenGL::solid_modelview, 1, GL_FALSE,
                       glm::value_ptr(glm::mat4()));
#else
    glPopMatrix();
#endif

    buffer.EndRead();
  }
}

void
DecomposeIntoNoRepeatTriangles(const gfx::IntRect& aTexCoordRect,
                               const gfx::IntSize& aTexSize,
                               RectTriangles& aRects,
                               bool aFlipY /* = false */)
{
    // normalize this
    gfx::IntRect tcr(aTexCoordRect);
    while (tcr.x >= aTexSize.width)
        tcr.x -= aTexSize.width;
    while (tcr.y >= aTexSize.height)
        tcr.y -= aTexSize.height;

    // Compute top left and bottom right tex coordinates
    GLfloat tl[2] =
        { GLfloat(tcr.x) / GLfloat(aTexSize.width),
          GLfloat(tcr.y) / GLfloat(aTexSize.height) };
    GLfloat br[2] =
        { GLfloat(tcr.XMost()) / GLfloat(aTexSize.width),
          GLfloat(tcr.YMost()) / GLfloat(aTexSize.height) };

    // then check if we wrap in either the x or y axis; if we do,
    // then also use fmod to figure out the "true" non-wrapping
    // texture coordinates.

    bool xwrap = false, ywrap = false;
    if (tcr.x < 0 || tcr.x > aTexSize.width ||
        tcr.XMost() < 0 || tcr.XMost() > aTexSize.width)
    {
        xwrap = true;
        tl[0] = WrapTexCoord(tl[0]);
        br[0] = WrapTexCoord(br[0]);
    }

    if (tcr.y < 0 || tcr.y > aTexSize.height ||
        tcr.YMost() < 0 || tcr.YMost() > aTexSize.height)
    {
        ywrap = true;
        tl[1] = WrapTexCoord(tl[1]);
        br[1] = WrapTexCoord(br[1]);
    }

    NS_ASSERTION(tl[0] >= 0.0f && tl[0] <= 1.0f &&
                 tl[1] >= 0.0f && tl[1] <= 1.0f &&
                 br[0] >= 0.0f && br[0] <= 1.0f &&
                 br[1] >= 0.0f && br[1] <= 1.0f,
                 "Somehow generated invalid texture coordinates");

    // If xwrap is false, the texture will be sampled from tl[0]
    // .. br[0].  If xwrap is true, then it will be split into tl[0]
    // .. 1.0, and 0.0 .. br[0].  Same for the Y axis.  The
    // destination rectangle is also split appropriately, according
    // to the calculated xmid/ymid values.

    // There isn't a 1:1 mapping between tex coords and destination coords;
    // when computing midpoints, we have to take that into account.  We
    // need to map the texture coords, which are (in the wrap case):
    // |tl->1| and |0->br| to the |0->1| range of the vertex coords.  So
    // we have the length (1-tl)+(br) that needs to map into 0->1.
    // These are only valid if there is wrap involved, they won't be used
    // otherwise.
    GLfloat xlen = (1.0f - tl[0]) + br[0];
    GLfloat ylen = (1.0f - tl[1]) + br[1];

    NS_ASSERTION(!xwrap || xlen > 0.0f, "xlen isn't > 0, what's going on?");
    NS_ASSERTION(!ywrap || ylen > 0.0f, "ylen isn't > 0, what's going on?");
    NS_ASSERTION(aTexCoordRect.width <= aTexSize.width &&
                 aTexCoordRect.height <= aTexSize.height, "tex coord rect would cause tiling!");

    if (!xwrap && !ywrap) {
        aRects.addRect(0.0f, 0.0f,
                       1.0f, 1.0f,
                       tl[0], tl[1],
                       br[0], br[1],
                       aFlipY);
    } else if (!xwrap && ywrap) {
        GLfloat ymid = (1.0f - tl[1]) / ylen;
        aRects.addRect(0.0f, 0.0f,
                       1.0f, ymid,
                       tl[0], tl[1],
                       br[0], 1.0f,
                       aFlipY);
        aRects.addRect(0.0f, ymid,
                       1.0f, 1.0f,
                       tl[0], 0.0f,
                       br[0], br[1],
                       aFlipY);
    } else if (xwrap && !ywrap) {
        GLfloat xmid = (1.0f - tl[0]) / xlen;
        aRects.addRect(0.0f, 0.0f,
                       xmid, 1.0f,
                       tl[0], tl[1],
                       1.0f, br[1],
                       aFlipY);
        aRects.addRect(xmid, 0.0f,
                       1.0f, 1.0f,
                       0.0f, tl[1],
                       br[0], br[1],
                       aFlipY);
    } else {
//.........这里部分代码省略.........

/**
 * if (load)
 *    Accum = ColorBuf * value
 * else
 *    Accum += ColorBuf * value
 */
static void
accum_or_load(struct gl_context *ctx, GLfloat value,
              GLint xpos, GLint ypos, GLint width, GLint height,
              GLboolean load)
{
   struct gl_renderbuffer *accRb =
      ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
   struct gl_renderbuffer *colorRb = ctx->ReadBuffer->_ColorReadBuffer;
   GLubyte *accMap, *colorMap;
   GLint accRowStride, colorRowStride;
   GLbitfield mappingFlags;

   if (!colorRb) {
      /* no read buffer - OK */
      return;
   }

   assert(accRb);

   mappingFlags = GL_MAP_WRITE_BIT;
   if (!load) /* if we're accumulating */
      mappingFlags |= GL_MAP_READ_BIT;

   /* Map accum buffer */
   ctx->Driver.MapRenderbuffer(ctx, accRb, xpos, ypos, width, height,
                               mappingFlags, &accMap, &accRowStride);
   if (!accMap) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
      return;
   }

   /* Map color buffer */
   ctx->Driver.MapRenderbuffer(ctx, colorRb, xpos, ypos, width, height,
                               GL_MAP_READ_BIT,
                               &colorMap, &colorRowStride);
   if (!colorMap) {
      ctx->Driver.UnmapRenderbuffer(ctx, accRb);
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
      return;
   }

   if (accRb->Format == MESA_FORMAT_SIGNED_RGBA_16) {
      const GLfloat scale = value * 32767.0f;
      GLuint i, j;
      GLfloat (*rgba)[4];

      rgba = malloc(width * 4 * sizeof(GLfloat));
      if (rgba) {
         for (j = 0; j < height; j++) {
            GLshort *acc = (GLshort *) accMap;

            /* read colors from source color buffer */
            _mesa_unpack_rgba_row(colorRb->Format, width, colorMap, rgba);

            if (load) {
               for (i = 0; i < width; i++) {
                  acc[i * 4 + 0] = (GLshort) (rgba[i][RCOMP] * scale);
                  acc[i * 4 + 1] = (GLshort) (rgba[i][GCOMP] * scale);
                  acc[i * 4 + 2] = (GLshort) (rgba[i][BCOMP] * scale);
                  acc[i * 4 + 3] = (GLshort) (rgba[i][ACOMP] * scale);
               }
            }
            else {
               /* accumulate */
               for (i = 0; i < width; i++) {
                  acc[i * 4 + 0] += (GLshort) (rgba[i][RCOMP] * scale);
                  acc[i * 4 + 1] += (GLshort) (rgba[i][GCOMP] * scale);
                  acc[i * 4 + 2] += (GLshort) (rgba[i][BCOMP] * scale);
                  acc[i * 4 + 3] += (GLshort) (rgba[i][ACOMP] * scale);
               }
            }

            colorMap += colorRowStride;
            accMap += accRowStride;
         }

         free(rgba);
      }
      else {
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
      }
   }
   else {
      /* other types someday? */
   }

   ctx->Driver.UnmapRenderbuffer(ctx, accRb);
   ctx->Driver.UnmapRenderbuffer(ctx, colorRb);
}

void Surface3d::generateMesh(const Surface& S)
{
	int n = S.getHeight();
	int m = S.getWidth();

	//set up vertices and normals
	vector<Vector> smoothNormals;
	getSmoothNormals(smoothNormals);

	GLfloat* vertices = new GLfloat[n*m*3];
	GLfloat* normals = new GLfloat[n*m*3];

	unsigned int verticesStride = 0;
	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < m; ++j) {
			vertices[verticesStride + 0] = GLfloat(j);
			vertices[verticesStride + 1] = GLfloat(S.getZ(j, i));
			vertices[verticesStride + 2] = GLfloat(i);

			normals[verticesStride + 0] = smoothNormals[i*m + j].x; 
			normals[verticesStride + 1] = smoothNormals[i*m + j].y;
			normals[verticesStride + 2] = smoothNormals[i*m + j].z;

			verticesStride += 3;
		}
	}

	glGenBuffers(1, &verticesId);
    glBindBuffer(GL_ARRAY_BUFFER, verticesId);
    glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat)*verticesStride, vertices, GL_STATIC_DRAW);

	glGenBuffers(1, &normalsId);
    glBindBuffer(GL_ARRAY_BUFFER, normalsId);
    glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat)*verticesStride, normals, GL_STATIC_DRAW);

	delete vertices;
	delete normals;
	
	//set up indices

	//a triangle strip generated by stitching
	GLuint* indices = new GLuint[2*m + (n-2)*m*2];

	unsigned int indicesStride = 0;

	for (int i = 0; i < n-1; ++i) {
		for (int j = 0; j < m; ++j) {
			indices[indicesStride++] = i*m + j;
			indices[indicesStride++] = (i+1)*m + j;
		}

		++i;
		if (i < n-1) {
			for (int j = m-1; j >= 0; --j) {
				indices[indicesStride++] = i*m + j;
				indices[indicesStride++] = (i+1)*m + j;
			}
		}
	}

	glGenBuffers(1, &indicesId);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indicesId);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(GLuint)*indicesStride, indices, GL_STATIC_DRAW);

	delete indices;

	indicesCount = indicesStride;
}

void TesseractWidget::SetColor(Coordinate color) {
    GLfloat c[4]= {GLfloat(color.x),GLfloat(color.y),GLfloat(color.z),1};
    glMaterialfv(GL_FRONT_AND_BACK,GL_AMBIENT_AND_DIFFUSE,c);
    glColor4fv(c);
}

// ------------------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------------------
Texture2D::Texture2D(Texture2DContainer* container, GLsizei sliceNum)
: mContainer(container)
, mSliceNum(GLfloat(sliceNum))
{
    assert(mContainer);
}

void GLLineIlluminator::updateMaterial(GLLineIlluminator::DataItem* dataItem) const
	{
	/* Update the material version: */
	dataItem->materialVersion=materialVersion;
	
	/* Upload the material texture: */
	dataItem->materialType=materialType;
	if(materialType==INTENSITY)
		{
		/* Create a 2D texture map encoding Phong's lighting model: */
		static GLfloat texture[32][32];
		for(int x=0;x<32;++x)
			{
			GLfloat s=2.0f*(GLfloat(x)+0.5f)/32.0f-1.0f;
			GLfloat oneMinusS2=1.0f-s*s;
			GLfloat ambientDiffuse=material.diffuse[0];
			ambientDiffuse*=Math::pow(Math::sqrt(oneMinusS2),2.0f);
			ambientDiffuse+=material.ambient[0];
			for(int y=0;y<32;++y)
				{
				GLfloat t=2.0f*(GLfloat(y)+0.5f)/32.0f-1.0f;
				GLfloat oneMinusT2=1.0f-t*t;
				GLfloat color=material.specular[0];
				color*=Math::pow(Math::abs(Math::sqrt(oneMinusS2*oneMinusT2)-s*t),material.shininess);
				color+=ambientDiffuse;
				texture[y][x]=color;
				}
			}
		
		/* Upload the created texture: */
		glBindTexture(GL_TEXTURE_2D,dataItem->materialTextureId);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_BASE_LEVEL,0);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAX_LEVEL,0);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
		glPixelStorei(GL_UNPACK_ROW_LENGTH,0);
		glPixelStorei(GL_UNPACK_SKIP_ROWS,0);
		glPixelStorei(GL_UNPACK_SKIP_PIXELS,0);
		glPixelStorei(GL_UNPACK_ALIGNMENT,1);
		glTexImage2D(GL_TEXTURE_2D,0,GL_INTENSITY,32,32,0,GL_LUMINANCE,GL_FLOAT,texture);
		glBindTexture(GL_TEXTURE_2D,0);
		}
	else if(materialType==RGBA)
		{
		/* Create a 2D texture map encoding Phong's lighting model: */
		static Color texture[32][32];
		for(int x=0;x<32;++x)
			{
			GLfloat s=2.0f*(GLfloat(x)+0.5f)/32.0f-1.0f;
			GLfloat oneMinusS2=1.0f-s*s;
			Color ambientDiffuse=material.diffuse;
			ambientDiffuse*=Math::pow(Math::sqrt(oneMinusS2),2.0f);
			ambientDiffuse+=material.ambient;
			for(int y=0;y<32;++y)
				{
				GLfloat t=2.0f*(GLfloat(y)+0.5f)/32.0f-1.0f;
				GLfloat oneMinusT2=1.0f-t*t;
				Color color=material.specular;
				color*=Math::pow(Math::abs(Math::sqrt(oneMinusS2*oneMinusT2)-s*t),material.shininess);
				color+=ambientDiffuse;
				texture[y][x]=color;
				}
			}
		
		/* Upload the created texture: */
		glBindTexture(GL_TEXTURE_2D,dataItem->materialTextureId);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_BASE_LEVEL,0);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAX_LEVEL,0);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
		glPixelStorei(GL_UNPACK_ROW_LENGTH,0);
		glPixelStorei(GL_UNPACK_SKIP_ROWS,0);
		glPixelStorei(GL_UNPACK_SKIP_PIXELS,0);
		glPixelStorei(GL_UNPACK_ALIGNMENT,1);
		glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,32,32,0,GL_RGBA,GL_FLOAT,texture);
		glBindTexture(GL_TEXTURE_2D,0);
		}
	}

  void VisualSceneSpecPoints :: DrawScene ()
  {
    if (!mesh) 
      {
	VisualScene::DrawScene();
	return;
      }

    if (changeval != specpoints.Size())
      BuildScene();
    changeval = specpoints.Size();



    glClearColor(backcolor, backcolor, backcolor, 1.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glEnable (GL_COLOR_MATERIAL);
    glColor3f (1.0f, 1.0f, 1.0f);
    glLineWidth (1.0f);

    glPushMatrix();
    glMultMatrixd (transformationmat);

    //  glEnable (GL_COLOR);
    //  glDisable (GL_COLOR_MATERIAL);
    if (vispar.drawedtangents)
      {
	glColor3d (1, 0, 0);
	glBegin (GL_LINES);
	for (int i = 1; i <= specpoints.Size(); i++)
	  {
	    const Point3d p1 = specpoints.Get(i).p;
	    const Point3d p2 = specpoints.Get(i).p + len * specpoints.Get(i).v;
	    glVertex3d (p1.X(), p1.Y(), p1.Z());
	    glVertex3d (p2.X(), p2.Y(), p2.Z());
	  }
	glEnd();
      }

    if (vispar.drawededges)
      {
	glColor3d (1, 0, 0);
	glBegin (GL_LINES);
	for (int i = 1; i <= mesh->GetNSeg(); i++)
	  {
	    const Segment & seg = mesh -> LineSegment (i);
	    glVertex3dv ( (*mesh)[seg[0]] );
            glVertex3dv ( (*mesh)[seg[1]] );
	    // glVertex3dv ( &(*mesh)[seg[0]].X() );
	    // glVertex3dv ( &(*mesh)[seg[1]].X() );
	  }
	glEnd();
      }

    glColor3d (1, 0, 0);
    glBegin (GL_LINES);
    int edges[12][2] = 
      { { 0, 1 },
	{ 2, 3 },
	{ 4, 5 },
	{ 6, 7 },
	{ 0, 2 },
	{ 1, 3 },
	{ 4, 6 },
	{ 5, 7 },
	{ 0, 4 },
	{ 1, 5 },
	{ 2, 6 },
	{ 3, 7 } };
    for (int i = 0; i < boxes.Size(); i++)
      {
	for (int j = 0; j < 12; j++)
	  {
	    glVertex3dv ( boxes[i].GetPointNr(edges[j][0]) );
	    glVertex3dv ( boxes[i].GetPointNr(edges[j][1]) );
	  }
	/*
	glVertex3dv ( boxes[i].PMin() );
	glVertex3dv ( boxes[i].PMax() );
	*/
      }
    glEnd();



    if (vispar.drawededgenrs)
      {
	glEnable (GL_COLOR_MATERIAL);
	GLfloat textcol[3] = { GLfloat(1 - backcolor),
			       GLfloat(1 - backcolor), 
			       GLfloat(1 - backcolor) };
	glColor3fv (textcol);
	glNormal3d (0, 0, 1);
	glPushAttrib (GL_LIST_BIT);
	// glListBase (fontbase);

	char buf[20];
	for (int i = 1; i <= mesh->GetNSeg(); i++)
	  {
//.........这里部分代码省略.........

/**
 * Apply fog to a span of RGBA pixels.
 * The fog value are either in the span->array->fog array or interpolated from
 * the fog/fogStep values.
 * They fog values are either fog coordinates (Z) or fog blend factors.
 * _PreferPixelFog should be in sync with that state!
 */
void
_swrast_fog_rgba_span( const struct gl_context *ctx, SWspan *span )
{
   const SWcontext *swrast = CONST_SWRAST_CONTEXT(ctx);
   GLfloat rFog, gFog, bFog;

   ASSERT(swrast->_FogEnabled);
   ASSERT(span->arrayMask & SPAN_RGBA);

   /* compute (scaled) fog color */
   if (span->array->ChanType == GL_UNSIGNED_BYTE) {
      rFog = ctx->Fog.Color[RCOMP] * 255.0F;
      gFog = ctx->Fog.Color[GCOMP] * 255.0F;
      bFog = ctx->Fog.Color[BCOMP] * 255.0F;
   }
   else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
      rFog = ctx->Fog.Color[RCOMP] * 65535.0F;
      gFog = ctx->Fog.Color[GCOMP] * 65535.0F;
      bFog = ctx->Fog.Color[BCOMP] * 65535.0F;
   }
   else {
      rFog = ctx->Fog.Color[RCOMP];
      gFog = ctx->Fog.Color[GCOMP];
      bFog = ctx->Fog.Color[BCOMP];
   }

   if (swrast->_PreferPixelFog) {
      /* The span's fog values are fog coordinates, now compute blend factors
       * and blend the fragment colors with the fog color.
       */
      switch (ctx->Fog.Mode) {
      case GL_LINEAR:
         {
            const GLfloat fogEnd = ctx->Fog.End;
            const GLfloat fogScale = (ctx->Fog.Start == ctx->Fog.End)
               ? 1.0F : 1.0F / (ctx->Fog.End - ctx->Fog.Start);
            if (span->array->ChanType == GL_UNSIGNED_BYTE) {
               GLubyte (*rgba)[4] = span->array->rgba8;
               FOG_LOOP(GLubyte, LINEAR_FOG);
            }
            else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
               GLushort (*rgba)[4] = span->array->rgba16;
               FOG_LOOP(GLushort, LINEAR_FOG);
            }
            else {
               GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL];
               ASSERT(span->array->ChanType == GL_FLOAT);
               FOG_LOOP(GLfloat, LINEAR_FOG);
            }
         }
         break;

      case GL_EXP:
         {
            const GLfloat density = -ctx->Fog.Density;
            if (span->array->ChanType == GL_UNSIGNED_BYTE) {
               GLubyte (*rgba)[4] = span->array->rgba8;
               FOG_LOOP(GLubyte, EXP_FOG);
            }
            else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
               GLushort (*rgba)[4] = span->array->rgba16;
               FOG_LOOP(GLushort, EXP_FOG);
            }
            else {
               GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL];
               ASSERT(span->array->ChanType == GL_FLOAT);
               FOG_LOOP(GLfloat, EXP_FOG);
            }
         }
         break;

      case GL_EXP2:
         {
            const GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density;
            if (span->array->ChanType == GL_UNSIGNED_BYTE) {
               GLubyte (*rgba)[4] = span->array->rgba8;
               FOG_LOOP(GLubyte, EXP2_FOG);
            }
            else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
               GLushort (*rgba)[4] = span->array->rgba16;
               FOG_LOOP(GLushort, EXP2_FOG);
            }
            else {
               GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL];
               ASSERT(span->array->ChanType == GL_FLOAT);
               FOG_LOOP(GLfloat, EXP2_FOG);
            }
         }
         break;

      default:
         _mesa_problem(ctx, "Bad fog mode in _swrast_fog_rgba_span");
         return;
//.........这里部分代码省略.........

void GLLineIlluminator::enableLighting(GLContextData& contextData) const
	{
	/* Get a pointer to the context data item: */
	DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
	
	/* Update the material texture if it is outdated: */
	if(dataItem->materialVersion!=materialVersion)
		updateMaterial(dataItem);
	
	GLenum previousMatrixMode=glGet<GLint>(GL_MATRIX_MODE);
	
	Geometry::Matrix<GLfloat,4,4> modelView;
	if(autoViewDirection||autoLightDirection)
		{
		/* Get the modelview matrix from OpenGL: */
		GLfloat matrixArray[16];
		glGetFloatv(GL_MODELVIEW_MATRIX,matrixArray);
		modelView=Geometry::Matrix<GLfloat,4,4>::fromColumnMajor(matrixArray);
		}
	
	/* Determine the view direction: */
	Geometry::ComponentArray<GLfloat,3> viewDir(viewDirection.getXyzw());
	if(autoViewDirection)
		{
		/* Get the projection matrix from OpenGL: */
		GLfloat matrixArray[16];
		glGetFloatv(GL_PROJECTION_MATRIX,matrixArray);
		Geometry::Matrix<GLfloat,4,4> projection=Geometry::Matrix<GLfloat,4,4>::fromColumnMajor(matrixArray);
		
		/* Calculate the view direction from the OpenGL projection and modelview matrices: */
		Geometry::ComponentArray<GLfloat,4> viewPos(0.0f,0.0f,1.0f,0.0f);
		viewPos=viewPos/projection;
		viewPos=viewPos/modelView;
		
		/* Check if it's an orthogonal or perspective projection: */
		if(Math::abs(viewPos[3])<1.0e-8f)
			{
			/* Just copy the view direction: */
			viewDir=viewPos;
			}
		else
			{
			/* Calculate the direction from the view point to the scene center: */
			for(int i=0;i<3;++i)
				viewDir[i]=viewPos[i]/viewPos[3]-sceneCenter[i];
			}
		GLfloat viewDirLen=GLfloat(Geometry::mag(viewDir));
		for(int i=0;i<3;++i)
			viewDir[i]/=viewDirLen;
		}
	
	/* Determine the light direction: */
	Geometry::ComponentArray<GLfloat,3> lightDir(lightDirection.getXyzw());
	if(autoLightDirection)
		{
		/* Query the light direction from OpenGL and transform it to model coordinates: */
		Geometry::ComponentArray<GLfloat,4> lightPos;
		glGetLightPosition(autoLightIndex,lightPos.getComponents());
		lightPos=lightPos/modelView;
		
		/* Check if it's a directional or point light: */
		if(Math::abs(lightPos[3])<1.0e-8f)
			{
			/* Just copy the light direction: */
			lightDir=lightPos;
			}
		else
			{
			/* Calculate the direction from the light source to the scene center: */
			for(int i=0;i<3;++i)
				lightDir[i]=lightPos[i]/lightPos[3]-sceneCenter[i];
			}
		GLfloat lightDirLen=GLfloat(Geometry::mag(lightDir));
		for(int i=0;i<3;++i)
			lightDir[i]/=lightDirLen;
		}
	
	/* Set up the OpenGL texture matrix: */
	glMatrixMode(GL_TEXTURE);
	glPushMatrix();
	GLfloat matrix[4][4];
	for(int j=0;j<3;++j)
		{
		matrix[j][0]=lightDir[j];
		matrix[j][1]=viewDir[j];
		matrix[j][2]=0.0f;
		matrix[j][3]=0.0f;
		}
	matrix[3][0]=1.0f;
	matrix[3][1]=1.0f;
	matrix[3][2]=0.0f;
	matrix[3][3]=2.0f;
	glLoadMatrixf((const GLfloat*)matrix);
	
	/* Set the OpenGL rendering mode: */
	glPushAttrib(GL_TEXTURE_BIT);
	glBindTexture(GL_TEXTURE_2D,dataItem->materialTextureId);
	glEnable(GL_TEXTURE_2D);
	if(dataItem->materialType==INTENSITY)
		glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
//.........这里部分代码省略.........

/*
 * RGBA copypixels with convolution.
 */
static void
copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
                      GLint width, GLint height, GLint destx, GLint desty)
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   struct gl_renderbuffer *drawRb = NULL;
   GLboolean quick_draw;
   GLint row;
   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
   const GLuint transferOps = ctx->_ImageTransferState;
   GLfloat *dest, *tmpImage, *convImage;
   struct sw_span span;

   INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);

   if (ctx->Depth.Test)
      _swrast_span_default_z(ctx, &span);
   if (swrast->_FogEnabled)
      _swrast_span_default_fog(ctx, &span);


   if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
       && !zoom
       && destx >= 0
       && destx + width <= (GLint) ctx->DrawBuffer->Width) {
      quick_draw = GL_TRUE;
      drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
   }
   else {
      quick_draw = GL_FALSE;
   }

   /* allocate space for GLfloat image */
   tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
   if (!tmpImage) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
      return;
   }
   convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
   if (!convImage) {
      _mesa_free(tmpImage);
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
      return;
   }

   /* read source image */
   dest = tmpImage;
   for (row = 0; row < height; row++) {
      GLchan rgba[MAX_WIDTH][4];
      /* Read GLchan and convert to GLfloat */
      _swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer,
                             width, srcx, srcy + row, rgba);
      chan_span_to_float(width, (CONST GLchan (*)[4]) rgba,
                         (GLfloat (*)[4]) dest);
      dest += 4 * width;
   }

   /* do the image transfer ops which preceed convolution */
   for (row = 0; row < height; row++) {
      GLfloat (*rgba)[4] = (GLfloat (*)[4]) (tmpImage + row * width * 4);
      _mesa_apply_rgba_transfer_ops(ctx,
                                    transferOps & IMAGE_PRE_CONVOLUTION_BITS,
                                    width, rgba);
   }

   /* do convolution */
   if (ctx->Pixel.Convolution2DEnabled) {
      _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
   }
   else {
      ASSERT(ctx->Pixel.Separable2DEnabled);
      _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
   }
   _mesa_free(tmpImage);

   /* do remaining post-convolution image transfer ops */
   for (row = 0; row < height; row++) {
      GLfloat (*rgba)[4] = (GLfloat (*)[4]) (convImage + row * width * 4);
      _mesa_apply_rgba_transfer_ops(ctx,
                                    transferOps & IMAGE_POST_CONVOLUTION_BITS,
                                    width, rgba);
   }

   /* write the new image */
   for (row = 0; row < height; row++) {
      const GLfloat *src = convImage + row * width * 4;
      GLint dy;

      /* convert floats back to chan */
      float_span_to_chan(width, (const GLfloat (*)[4]) src, span.array->rgba);

      /* write row to framebuffer */
      dy = desty + row;
      if (quick_draw && dy >= 0 && dy < (GLint) ctx->DrawBuffer->Height) {
         drawRb->PutRow(ctx, drawRb, width, destx, dy, span.array->rgba, NULL);
      }
      else {
//.........这里部分代码省略.........

// Handles the reshape event by setting the viewport so that it takes up the
// whole visible region, then sets the projection matrix to something reason-
// able that maintains proper aspect ratio.
void reshape(GLint w, GLint h) {
  glViewport(0, 0, w, h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(65.0, GLfloat(w)/GLfloat(h), 1.0, 20.0);
}

void WaterRenderer::render(const PTransform& projection,const OGTransform& modelview,GLContextData& contextData) const
	{
	/* Get the data item: */
	DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
	
	/* Calculate the required matrices: */
	PTransform projectionModelview=projection;
	projectionModelview*=modelview;
	
	/* Bind the water rendering shader: */
	glUseProgramObjectARB(dataItem->waterShader);
	const GLint* ulPtr=dataItem->waterShaderUniforms;
	
	/* Bind the water quantity texture: */
	glActiveTextureARB(GL_TEXTURE0_ARB);
	waterTable->bindQuantityTexture(contextData);
	glUniform1iARB(*(ulPtr++),0);
	
	/* Bind the bathymetry texture: */
	glActiveTextureARB(GL_TEXTURE1_ARB);
	waterTable->bindBathymetryTexture(contextData);
	glUniform1iARB(*(ulPtr++),1);
	
	/* Calculate and upload the vertex transformation from grid space to eye space: */
	PTransform modelviewGridTransform=gridTransform;
	modelviewGridTransform.leftMultiply(modelview);
	glUniformARB(*(ulPtr++),modelviewGridTransform);
	
	/* Calculate the transposed tangent plane transformation from grid space to eye space: */
	PTransform tangentModelviewGridTransform=tangentGridTransform;
	tangentModelviewGridTransform*=Geometry::invert(modelview);
	
	/* Transpose and upload the transposed tangent plane transformation: */
	const Scalar* tmvgtPtr=tangentModelviewGridTransform.getMatrix().getEntries();
	GLfloat tangentModelviewGridTransformMatrix[16];
	GLfloat* tmvgtmPtr=tangentModelviewGridTransformMatrix;
	for(int i=0;i<16;++i,++tmvgtPtr,++tmvgtmPtr)
		*tmvgtmPtr=GLfloat(*tmvgtPtr);
	glUniformMatrix4fvARB(*(ulPtr++),1,GL_FALSE,tangentModelviewGridTransformMatrix);
	
	/* Calculate and upload the vertex transformation from grid space to clip space: */
	PTransform projectionModelviewGridTransform=gridTransform;
	projectionModelviewGridTransform.leftMultiply(modelview);
	projectionModelviewGridTransform.leftMultiply(projection);
	glUniformARB(*(ulPtr++),projectionModelviewGridTransform);
	
	/* Bind the vertex and index buffers: */
	glBindBufferARB(GL_ARRAY_BUFFER_ARB,dataItem->vertexBuffer);
	glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,dataItem->indexBuffer);
	
	/* Draw the surface: */
	GLVertexArrayParts::enable(Vertex::getPartsMask());
	glVertexPointer(static_cast<const Vertex*>(0));
	GLuint* indexPtr=0;
	for(unsigned int y=1;y<waterGridSize[1];++y,indexPtr+=waterGridSize[0]*2)
		glDrawElements(GL_QUAD_STRIP,waterGridSize[0]*2,GL_UNSIGNED_INT,indexPtr);
	GLVertexArrayParts::disable(Vertex::getPartsMask());
	
	/* Unbind all textures and buffers: */
	glBindBufferARB(GL_ARRAY_BUFFER_ARB,0);
	glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,0);
	glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
	glActiveTextureARB(GL_TEXTURE0_ARB);
	glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
	
	/* Unbind the water rendering shader: */
	glUseProgramObjectARB(0);
	}

void TextureBlitter::drawTexture(int textureId, const QRectF &targetRect, const QSize &targetSize, int depth, bool targethasInvertedY, bool sourceHasInvertedY)
{

    glViewport(0,0,targetSize.width(),targetSize.height());
    GLfloat zValue = depth / 1000.0f;
    //Set Texture and Vertex coordinates
    const GLfloat textureCoordinates[] = {
        0, 0,
        1, 0,
        1, 1,
        0, 1
    };

    GLfloat x1 = targetRect.left();
    GLfloat x2 = targetRect.right();
    GLfloat y1, y2;
    if (targethasInvertedY) {
        if (sourceHasInvertedY) {
            y1 = targetRect.top();
            y2 = targetRect.bottom();
        } else {
            y1 = targetRect.bottom();
            y2 = targetRect.top();
        }
    } else {
        if (sourceHasInvertedY) {
            y1 = targetSize.height() - targetRect.top();
            y2 = targetSize.height() - targetRect.bottom();
        } else {
            y1 = targetSize.height() - targetRect.bottom();
            y2 = targetSize.height() - targetRect.top();
        }
    }

    const GLfloat vertexCoordinates[] = {
        GLfloat(x1), GLfloat(y1), zValue,
        GLfloat(x2), GLfloat(y1), zValue,
        GLfloat(x2), GLfloat(y2), zValue,
        GLfloat(x1), GLfloat(y2), zValue
    };



    //Set matrix to transfrom geometry values into gl coordinate space.
    m_transformMatrix.setToIdentity();
    m_transformMatrix.scale( 2.0f / targetSize.width(), 2.0f / targetSize.height() );
    m_transformMatrix.translate(-targetSize.width() / 2.0f, -targetSize.height() / 2.0f);

    //attach the data!
    QOpenGLContext *currentContext = QOpenGLContext::currentContext();
    currentContext->functions()->glEnableVertexAttribArray(m_vertexCoordEntry);
    currentContext->functions()->glEnableVertexAttribArray(m_textureCoordEntry);

    currentContext->functions()->glVertexAttribPointer(m_vertexCoordEntry, 3, GL_FLOAT, GL_FALSE, 0, vertexCoordinates);
    currentContext->functions()->glVertexAttribPointer(m_textureCoordEntry, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinates);
    m_shaderProgram->setUniformValue(m_matrixLocation, m_transformMatrix);

    glBindTexture(GL_TEXTURE_2D, textureId);

    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

    glBindTexture(GL_TEXTURE_2D, 0);

    currentContext->functions()->glDisableVertexAttribArray(m_vertexCoordEntry);
    currentContext->functions()->glDisableVertexAttribArray(m_textureCoordEntry);
}