/**
* Apply antialiasing coverage value to alpha values.
*/
static inline void
apply_aa_coverage(SWspan *span)
{
const GLfloat *coverage = span->array->coverage;
GLuint i;
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte (*rgba)[4] = span->array->rgba8;
for (i = 0; i < span->end; i++) {
const GLfloat a = rgba[i][ACOMP] * coverage[i];
rgba[i][ACOMP] = (GLubyte) CLAMP(a, 0.0, 255.0);
ASSERT(coverage[i] >= 0.0);
ASSERT(coverage[i] <= 1.0);
}
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
GLushort (*rgba)[4] = span->array->rgba16;
for (i = 0; i < span->end; i++) {
const GLfloat a = rgba[i][ACOMP] * coverage[i];
rgba[i][ACOMP] = (GLushort) CLAMP(a, 0.0, 65535.0);
}
}
else {
GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL];
for (i = 0; i < span->end; i++) {
rgba[i][ACOMP] = rgba[i][ACOMP] * coverage[i];
/* clamp later */
}
}
}
/**
* 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 GLcontext *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 (swrast->_FogMode) {
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_COL0];
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_COL0];
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_COL0];
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;
}
}
else {
/* The span's fog start/step/array values are blend factors in [0,1].
* They were previously computed per-vertex.
*/
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte (*rgba)[4] = span->array->rgba8;
FOG_LOOP(GLubyte, BLEND_FOG);
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
GLushort (*rgba)[4] = span->array->rgba16;
FOG_LOOP(GLushort, BLEND_FOG);
}
else {
GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
ASSERT(span->array->ChanType == GL_FLOAT);
FOG_LOOP(GLfloat, BLEND_FOG);
}
}
}
void CreateHeightFieldMesh (NewtonCollision* collision, Entity* ent)
{
int width;
int height;
dFloat hScale;
dFloat vScale;
unsigned short* elevations;
NewtonCollisionInfoRecord collisionInfo;
// keep the compiler happy
memset (&collisionInfo, 0, sizeof (NewtonCollisionInfoRecord));
NewtonCollisionGetInfo (collision, &collisionInfo);
// get the info from the collision mesh and create a visual mesh
width = collisionInfo.m_heightField.m_width;
height = collisionInfo.m_heightField.m_height;
elevations = collisionInfo.m_heightField.m_elevation;
vScale = collisionInfo.m_heightField.m_verticalScale;
hScale = collisionInfo.m_heightField.m_horizonalScale;
// allocate space to store vertex data
ent->m_vertexCount = width * height;
ent->m_vertex = (dFloat*) malloc (3 * width * height * sizeof (dFloat));
ent->m_normal = (dFloat*) malloc (3 * width * height * sizeof (dFloat));
ent->m_uv = (dFloat*) malloc (2 * width * height * sizeof (dFloat));
// scan the height field and convert every cell into two triangles
for (int z = 0; z < height; z ++) {
int z0;
int z1;
z0 = ((z - 1) < 0) ? 0 : z - 1;
z1 = ((z + 1) > (height - 1)) ? height - 1 : z + 1 ;
for (int x = 0; x < width; x ++) {
int x0;
int x1;
x0 = ((x - 1) < 0) ? 0 : x - 1;
x1 = ((x + 1) > (width - 1)) ? width - 1 : x + 1 ;
dVector p0 (hScale * x0, elevations[z * width + x1] * vScale, hScale * z);
dVector p1 (hScale * x1, elevations[z * width + x0] * vScale, hScale * z);
dVector x10 (p1 - p0);
dVector q0 (hScale * x, elevations[z0 * width + x] * vScale, hScale * z0);
dVector q1 (hScale * x, elevations[z1 * width + x] * vScale, hScale * z1);
dVector z10 (q1 - q0);
dVector normal (z10 * x10);
normal = normal.Scale (dSqrt (1.0f / (normal % normal)));
dVector point (hScale * x, elevations[z * width + x] * vScale, hScale * z);
ent->m_vertex[(z * width + x) * 3 + 0] = point.m_x;
ent->m_vertex[(z * width + x) * 3 + 1] = point.m_y;
ent->m_vertex[(z * width + x) * 3 + 2] = point.m_z;
ent->m_normal[(z * width + x) * 3 + 0] = normal.m_x;
ent->m_normal[(z * width + x) * 3 + 1] = normal.m_y;
ent->m_normal[(z * width + x) * 3 + 2] = normal.m_z;
ent->m_uv[(z * width + x) * 2 + 0] = x * TEXTURE_SCALE;
ent->m_uv[(z * width + x) * 2 + 1] = z * TEXTURE_SCALE;
}
}
// since the bitmap sample is 256 x 256, i fix into a single 16 bit index vertex array with
ent->m_subMeshCount = 1;
ent->m_subMeshes = (Entity::SubMesh*) malloc (sizeof (Entity::SubMesh));
// allocate space to the index list
ent->m_subMeshes[0].m_textureHandle = LoadTexture ("grassAndDirt.tga");
ent->m_subMeshes[0].m_indexCount = (width - 1) * (height - 1) * 6;
ent->m_subMeshes[0].m_indexArray = (unsigned short*) malloc (ent->m_subMeshes[0].m_indexCount * sizeof (unsigned short));
// now following the grid pattern and create and index list
int index;
int vertexIndex;
index = 0;
vertexIndex = 0;
for (int z = 0; z < height - 1; z ++) {
vertexIndex = z * width;
for (int x = 0; x < width - 1; x ++) {
ent->m_subMeshes[0].m_indexArray[index + 0] = GLushort (vertexIndex);
ent->m_subMeshes[0].m_indexArray[index + 1] = GLushort (vertexIndex + width);
ent->m_subMeshes[0].m_indexArray[index + 2] = GLushort (vertexIndex + 1);
index += 3;
ent->m_subMeshes[0].m_indexArray[index + 0] = GLushort (vertexIndex + 1);
ent->m_subMeshes[0].m_indexArray[index + 1] = GLushort (vertexIndex + width);
ent->m_subMeshes[0].m_indexArray[index + 2] = GLushort (vertexIndex + width + 1);
index += 3;
vertexIndex ++;
}
}
// Optimize the mesh for hardware rendering if possible
ent->OptimizeMesh();
/*
dVector boxP0;
dVector boxP1;
// get the position of the aabb of this geometry
dMatrix matrix (ent->m_curRotation, ent->m_curPosition);
NewtonCollisionCalculateAABB (collision, &matrix[0][0], &boxP0.m_x, &boxP1.m_x);
// place the origin of the visual mesh at the center of the height field
matrix.m_posit = (boxP0 + boxP1).Scale (-0.5f);
matrix.m_posit.m_w = 1.0f;
ent->m_curPosition = matrix.m_posit;
ent->m_prevPosition = matrix.m_posit;
// create the level rigid body
body = NewtonCreateBody(world, collision);
// release the collision tree (this way the application does not have to do book keeping of Newton objects
NewtonReleaseCollision (world, collision);
// save the pointer to the graphic object with the body.
NewtonBodySetUserData (body, ent);
// set the global position of this body
NewtonBodySetMatrix (body, &matrix[0][0]);
// set the destructor for this object
// NewtonBodySetDestructorCallback (body, Destructor);
// get the position of the aabb of this geometry
NewtonCollisionCalculateAABB (collision, &matrix[0][0], &boxP0.m_x, &boxP1.m_x);
// add some extra padding the world size
boxP0.m_x -= 10.0f;
boxP0.m_y -= 10.0f;
boxP0.m_z -= 10.0f;
boxP1.m_x += 10.0f;
boxP1.m_y += 400.0f;
boxP1.m_z += 10.0f;
// set the world size
NewtonSetWorldSize (world, &boxP0.m_x, &boxP1.m_x);
return body;
*/
}
/**
* Interpolate primary colors to fill in the span->array->rgba8 (or rgb16)
* color array.
*/
static inline void
interpolate_int_colors(struct gl_context *ctx, SWspan *span)
{
#if CHAN_BITS != 32
const GLuint n = span->end;
GLuint i;
ASSERT(!(span->arrayMask & SPAN_RGBA));
#endif
switch (span->array->ChanType) {
#if CHAN_BITS != 32
case GL_UNSIGNED_BYTE:
{
GLubyte (*rgba)[4] = span->array->rgba8;
if (span->interpMask & SPAN_FLAT) {
GLubyte color[4];
color[RCOMP] = FixedToInt(span->red);
color[GCOMP] = FixedToInt(span->green);
color[BCOMP] = FixedToInt(span->blue);
color[ACOMP] = FixedToInt(span->alpha);
for (i = 0; i < n; i++) {
COPY_4UBV(rgba[i], color);
}
}
else {
GLfixed r = span->red;
GLfixed g = span->green;
GLfixed b = span->blue;
GLfixed a = span->alpha;
GLint dr = span->redStep;
GLint dg = span->greenStep;
GLint db = span->blueStep;
GLint da = span->alphaStep;
for (i = 0; i < n; i++) {
rgba[i][RCOMP] = FixedToChan(r);
rgba[i][GCOMP] = FixedToChan(g);
rgba[i][BCOMP] = FixedToChan(b);
rgba[i][ACOMP] = FixedToChan(a);
r += dr;
g += dg;
b += db;
a += da;
}
}
}
break;
case GL_UNSIGNED_SHORT:
{
GLushort (*rgba)[4] = span->array->rgba16;
if (span->interpMask & SPAN_FLAT) {
GLushort color[4];
color[RCOMP] = FixedToInt(span->red);
color[GCOMP] = FixedToInt(span->green);
color[BCOMP] = FixedToInt(span->blue);
color[ACOMP] = FixedToInt(span->alpha);
for (i = 0; i < n; i++) {
COPY_4V(rgba[i], color);
}
}
else {
GLushort (*rgba)[4] = span->array->rgba16;
GLfixed r, g, b, a;
GLint dr, dg, db, da;
r = span->red;
g = span->green;
b = span->blue;
a = span->alpha;
dr = span->redStep;
dg = span->greenStep;
db = span->blueStep;
da = span->alphaStep;
for (i = 0; i < n; i++) {
rgba[i][RCOMP] = FixedToChan(r);
rgba[i][GCOMP] = FixedToChan(g);
rgba[i][BCOMP] = FixedToChan(b);
rgba[i][ACOMP] = FixedToChan(a);
r += dr;
g += dg;
b += db;
a += da;
}
}
}
break;
#endif
case GL_FLOAT:
interpolate_active_attribs(ctx, span, FRAG_BIT_COL);
break;
default:
_mesa_problem(ctx, "bad datatype 0x%x in interpolate_int_colors",
span->array->ChanType);
}
span->arrayMask |= SPAN_RGBA;
}
/**
* Apply the color mask to a span of rgba values.
*/
void
_swrast_mask_rgba_span(struct gl_context *ctx, struct gl_renderbuffer *rb,
SWspan *span)
{
const GLuint n = span->end;
void *rbPixels;
ASSERT(n < MAX_WIDTH);
ASSERT(span->arrayMask & SPAN_RGBA);
rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
/*
* Do component masking.
* Note that we're not using span->array->mask[] here. We could...
*/
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
/* treat 4xGLubyte as 1xGLuint */
const GLuint srcMask = *((GLuint *) ctx->Color.ColorMask);
const GLuint dstMask = ~srcMask;
const GLuint *dst = (const GLuint *) rbPixels;
GLuint *src = (GLuint *) span->array->rgba8;
GLuint i;
for (i = 0; i < n; i++) {
src[i] = (src[i] & srcMask) | (dst[i] & dstMask);
}
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
/* 2-byte components */
/* XXX try to use 64-bit arithmetic someday */
const GLushort rMask = ctx->Color.ColorMask[RCOMP] ? 0xffff : 0x0;
const GLushort gMask = ctx->Color.ColorMask[GCOMP] ? 0xffff : 0x0;
const GLushort bMask = ctx->Color.ColorMask[BCOMP] ? 0xffff : 0x0;
const GLushort aMask = ctx->Color.ColorMask[ACOMP] ? 0xffff : 0x0;
const GLushort (*dst)[4] = (const GLushort (*)[4]) rbPixels;
GLushort (*src)[4] = span->array->rgba16;
GLuint i;
for (i = 0; i < n; i++) {
src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask);
src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask);
src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask);
src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask);
}
}
else {
/* 4-byte components */
const GLuint rMask = ctx->Color.ColorMask[RCOMP] ? ~0x0 : 0x0;
const GLuint gMask = ctx->Color.ColorMask[GCOMP] ? ~0x0 : 0x0;
const GLuint bMask = ctx->Color.ColorMask[BCOMP] ? ~0x0 : 0x0;
const GLuint aMask = ctx->Color.ColorMask[ACOMP] ? ~0x0 : 0x0;
const GLuint (*dst)[4] = (const GLuint (*)[4]) rbPixels;
GLuint (*src)[4] = (GLuint (*)[4]) span->array->attribs[FRAG_ATTRIB_COL];
GLuint i;
for (i = 0; i < n; i++) {
src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask);
src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask);
src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask);
src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask);
}
}
}
void xglrenderer::ev_sphere(xobjevent *pev)
{
xobject *pNotifier;
int evid;
float detail;
if(!((xpackev*)pev)->unpack("odf",&pNotifier,&evid,&detail)) {
wyc_error("xglrenderer::sphere: bad args");
return;
}
unsigned batchid=strhash("sphere");
xvertex_batch *pbatch=(xvertex_batch*)m_groups[GROUP_BATCH]->request(batchid);
if(pbatch==0) {
// a quarter of circle have 4~16 points
unsigned quarter=4+unsigned(detail*12);
unsigned circle=quarter*4;
float step=float(XMATH_HPI/quarter);
float rad=step;
// pre-compute the sin & cos
float *sina=new float[quarter], *cosa=new float[quarter];
sina[0]=0, cosa[0]=1;
for(unsigned i=1; i<quarter; ++i) {
sina[i]=sin(rad);
cosa[i]=cos(rad);
rad+=step;
}
// fill vertex positions
unsigned vertexCount=(2*quarter-1)*quarter*4+2;
xvec3f_t *buffer=new xvec3f_t[vertexCount];
xvec3f_t *part1=buffer, *part2, *part3, *part4;
// top half of sphere
part1->set(0,1,0);
part1+=1;
for(int i=quarter-1; i>=0; --i) {
float y=sina[i], len=cosa[i];
part2=part1+quarter;
part3=part2+quarter;
part4=part3+quarter;
part1->set(len,y,0);
part2->set(0,y,len);
part3->set(-len,y,0);
part4->set(0,y,-len);
part2+=quarter;
part4+=quarter;
for(unsigned j=1; j<quarter; ++j) {
float x=len*cosa[j], z=len*sina[j];
++part1;
part1->set(x,y,z);
--part2;
part2->set(-x,y,z);
++part3;
part3->set(-x,y,-z);
--part4;
part4->set(x,y,-z);
}
part1=part4+quarter-1;
}
// bottom half of sphere
part1=buffer+1;
part2=buffer+vertexCount-1;
part2->set(0,-1,0);
for(unsigned i=quarter-1; i>0; --i) {
part2-=circle;
for(unsigned j=0; j<circle; ++j, ++part1)
part2[j].set(part1->x,-part1->y,part1->z);
}
assert(unsigned(part2-part1)==circle);
// vertex buffer
GLuint vertbuffs[2];
glGenBuffers(2,vertbuffs);
glBindBuffer(GL_ARRAY_BUFFER,vertbuffs[0]);
glBufferData(GL_ARRAY_BUFFER,vertexCount*sizeof(xvec3f_t),buffer,GL_STATIC_DRAW);
delete [] buffer;
delete [] sina;
delete [] cosa;
// index buffer
unsigned indexCount=48*quarter*quarter-24*quarter;
assert(indexCount<65536);
GLushort *index=new GLushort[indexCount];
GLushort *iter=index;
GLushort vidx=1;
while(vidx<circle) {
*iter++=0;
*iter++=vidx+1;
*iter++=vidx;
++vidx;
}
*iter++=0;
*iter++=1;
*iter++=vidx;
vidx=1;
for(unsigned i=2*quarter-2; i>0; --i) {
unsigned end=vidx+circle-1;
while(vidx<end) {
iter[0]=vidx;
iter[1]=vidx+1;
iter[2]=GLushort(vidx+circle);
iter[3]=iter[2];
iter[4]=iter[1];
iter[5]=GLushort(iter[1]+circle);
iter+=6;
++vidx;
}
iter[0]=vidx;
iter[1]=GLushort(vidx+1-circle);
iter[2]=GLushort(vidx+circle);
iter[3]=iter[2];
iter[4]=iter[1];
iter[5]=vidx+1;
iter+=6;
++vidx;
}
GLushort last=GLushort(vertexCount-1);
for(unsigned i=1; i<circle; ++i) {
*iter++=last;
*iter++=vidx;
*iter++=vidx+1;
++vidx;
}
*iter++=last;
*iter++=vidx;
*iter++=GLushort(vidx+1-circle);
assert(unsigned(iter-index)==indexCount);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,vertbuffs[1]);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,indexCount*sizeof(GLushort),index,GL_STATIC_DRAW);
delete [] index;
xvertex_buffer *pvb;
if(GLEW_ARB_vertex_array_object)
{
GLuint vao;
glGenVertexArrays(1,&vao);
glBindVertexArray(vao);
glBindBuffer(GL_ARRAY_BUFFER,vertbuffs[0]);
glVertexAttribPointer(USAGE_POSITION,3,GL_FLOAT,GL_FALSE,0,(void*)0);
glEnableVertexAttribArray(USAGE_POSITION);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,vertbuffs[1]);
glBindVertexArray(0);
pbatch=(xvertex_batch*)m_groups[GROUP_BATCH]->create(batchid,(void*)vao);
pvb=wycnew xvertex_buffer;
pvb->create(vertbuffs[0]);
pbatch->add_buffer(pvb);
}
else {
pbatch=(xvertex_batch*)m_groups[GROUP_BATCH]->create(batchid,0);
pvb=wycnew xvertex_buffer;
pvb->create(vertbuffs[0]);
pbatch->add_buffer(pvb,USAGE_POSITION,3,GL_FLOAT,false,0,0);
}
pvb=wycnew xvertex_buffer;
pvb->create(vertbuffs[1]);
pbatch->set_index(pvb,GL_UNSIGNED_SHORT);
pbatch->set_mode(GL_TRIANGLES,indexCount,0);
} // if (pbatch==0)
if(pNotifier) {
pev=xpackev::pack("o",pbatch);
pNotifier->on_event(evid,pev);
}
}
/**
* 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 GLcontext *ctx, SWspan *span )
{
const SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLfloat rFog, gFog, bFog;
const GLuint haveW = (span->interpMask & SPAN_W);
ASSERT(swrast->_FogEnabled);
ASSERT((span->interpMask | span->arrayMask) & SPAN_FOG);
ASSERT(span->arrayMask & SPAN_RGBA);
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
rFog = ctx->Fog.Color[RCOMP] * 255.0;
gFog = ctx->Fog.Color[GCOMP] * 255.0;
bFog = ctx->Fog.Color[BCOMP] * 255.0;
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
rFog = ctx->Fog.Color[RCOMP] * 65535.0;
gFog = ctx->Fog.Color[GCOMP] * 65535.0;
bFog = ctx->Fog.Color[BCOMP] * 65535.0;
}
else {
rFog = ctx->Fog.Color[RCOMP];
gFog = ctx->Fog.Color[GCOMP];
bFog = ctx->Fog.Color[BCOMP];
}
/* NOTE: if haveW is true, that means the fog start/step values are
* perspective-corrected and we have to divide each fog coord by W.
*/
/* we need to compute fog blend factors */
if (swrast->_PreferPixelFog) {
/* The span's fog values are fog coordinates, now compute blend factors
* and blend the fragment colors with the fog color.
*/
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);
const GLfloat density = -ctx->Fog.Density;
const GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density;
switch (swrast->_FogMode) {
case GL_LINEAR:
#define COMPUTE_F f = (fogEnd - FABSF(fogCoord) / w) * fogScale;
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
FOG_LOOP(GLubyte, COMPUTE_F);
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
GLushort (*rgba)[4] = span->array->color.sz2.rgba;
FOG_LOOP(GLushort, COMPUTE_F);
}
else {
GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
ASSERT(span->array->ChanType == GL_FLOAT);
FOG_LOOP(GLfloat, COMPUTE_F);
}
#undef COMPUTE_F
break;
case GL_EXP:
#define COMPUTE_F f = EXPF(density * FABSF(fogCoord) / w);
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
FOG_LOOP(GLubyte, COMPUTE_F);
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
GLushort (*rgba)[4] = span->array->color.sz2.rgba;
FOG_LOOP(GLushort, COMPUTE_F);
}
else {
GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
ASSERT(span->array->ChanType == GL_FLOAT);
FOG_LOOP(GLfloat, COMPUTE_F);
}
#undef COMPUTE_F
break;
case GL_EXP2:
#define COMPUTE_F const GLfloat coord = fogCoord / w; \
GLfloat tmp = negDensitySquared * coord * coord; \
if (tmp < FLT_MIN_10_EXP) \
tmp = FLT_MIN_10_EXP; \
f = EXPF(tmp);
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
FOG_LOOP(GLubyte, COMPUTE_F);
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
GLushort (*rgba)[4] = span->array->color.sz2.rgba;
FOG_LOOP(GLushort, COMPUTE_F);
}
else {
GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
ASSERT(span->array->ChanType == GL_FLOAT);
FOG_LOOP(GLfloat, COMPUTE_F);
}
#undef COMPUTE_F
break;
default:
_mesa_problem(ctx, "Bad fog mode in _swrast_fog_rgba_span");
return;
}
}
else if (span->arrayMask & SPAN_FOG) {
/* The span's fog array values are blend factors.
* They were previously computed per-vertex.
*/
GLuint i;
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
for (i = 0; i < span->end; i++) {
const GLfloat f = span->array->attribs[FRAG_ATTRIB_FOGC][i][0];
const GLfloat oneMinusF = 1.0F - f;
rgba[i][RCOMP] = (GLubyte) (f * rgba[i][RCOMP] + oneMinusF * rFog);
rgba[i][GCOMP] = (GLubyte) (f * rgba[i][GCOMP] + oneMinusF * gFog);
rgba[i][BCOMP] = (GLubyte) (f * rgba[i][BCOMP] + oneMinusF * bFog);
}
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
GLushort (*rgba)[4] = span->array->color.sz2.rgba;
for (i = 0; i < span->end; i++) {
const GLfloat f = span->array->attribs[FRAG_ATTRIB_FOGC][i][0];
const GLfloat oneMinusF = 1.0F - f;
rgba[i][RCOMP] = (GLushort) (f * rgba[i][RCOMP] + oneMinusF * rFog);
rgba[i][GCOMP] = (GLushort) (f * rgba[i][GCOMP] + oneMinusF * gFog);
rgba[i][BCOMP] = (GLushort) (f * rgba[i][BCOMP] + oneMinusF * bFog);
}
}
else {
GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
ASSERT(span->array->ChanType == GL_FLOAT);
for (i = 0; i < span->end; i++) {
const GLfloat f = span->array->attribs[FRAG_ATTRIB_FOGC][i][0];
const GLfloat oneMinusF = 1.0F - f;
rgba[i][RCOMP] = f * rgba[i][RCOMP] + oneMinusF * rFog;
rgba[i][GCOMP] = f * rgba[i][GCOMP] + oneMinusF * gFog;
rgba[i][BCOMP] = f * rgba[i][BCOMP] + oneMinusF * bFog;
}
}
}
else {
/* The span's fog start/step values are blend factors.
* They were previously computed per-vertex.
*/
#define COMPUTE_F f = fogCoord / w;
if (span->array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte (*rgba)[4] = span->array->color.sz1.rgba;
FOG_LOOP(GLubyte, COMPUTE_F);
}
else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
GLushort (*rgba)[4] = span->array->color.sz2.rgba;
FOG_LOOP(GLushort, COMPUTE_F);
}
else {
GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0];
ASSERT(span->array->ChanType == GL_FLOAT);
FOG_LOOP(GLfloat, COMPUTE_F);
}
#undef COMPUTE_F
}
}