/** Masks are uint[4] vectors with each element being 0 or 0xffffffff */
typedef vector unsigned int mask_t;
-typedef union
-{
- vector float v;
- float f[4];
-} float4;
/**
struct interp_coef
{
- float4 a0;
- float4 dadx;
- float4 dady;
+ vector float a0;
+ vector float dadx;
+ vector float dady;
};
struct edge etop;
struct edge emaj;
- float oneoverarea;
+ float oneOverArea; /* XXX maybe make into vector? */
uint facing;
- uint tx, ty;
+ uint tx, ty; /**< position of current tile (x, y) */
int cliprect_minx, cliprect_maxx, cliprect_miny, cliprect_maxy;
-#if 0
- struct tgsi_interp_coef coef[PIPE_MAX_SHADER_INPUTS];
-#else
struct interp_coef coef[PIPE_MAX_SHADER_INPUTS];
-#endif
-
-#if 0
- struct quad_header quad;
-#endif
struct {
int left[2]; /**< [0] = row0, [1] = row1 */
};
-
static struct setup_stage setup;
-
-
-#if 0
-/**
- * Basically a cast wrapper.
- */
-static INLINE struct setup_stage *setup_stage( struct draw_stage *stage )
-{
- return (struct setup_stage *)stage;
-}
-#endif
-
-#if 0
-/**
- * Clip setup.quad against the scissor/surface bounds.
- */
-static INLINE void
-quad_clip(struct setup_stage *setup)
-{
- const struct pipe_scissor_state *cliprect = &setup.softpipe->cliprect;
- const int minx = (int) cliprect->minx;
- const int maxx = (int) cliprect->maxx;
- const int miny = (int) cliprect->miny;
- const int maxy = (int) cliprect->maxy;
-
- if (setup.quad.x0 >= maxx ||
- setup.quad.y0 >= maxy ||
- setup.quad.x0 + 1 < minx ||
- setup.quad.y0 + 1 < miny) {
- /* totally clipped */
- setup.quad.mask = 0x0;
- return;
- }
- if (setup.quad.x0 < minx)
- setup.quad.mask &= (MASK_BOTTOM_RIGHT | MASK_TOP_RIGHT);
- if (setup.quad.y0 < miny)
- setup.quad.mask &= (MASK_BOTTOM_LEFT | MASK_BOTTOM_RIGHT);
- if (setup.quad.x0 == maxx - 1)
- setup.quad.mask &= (MASK_BOTTOM_LEFT | MASK_TOP_LEFT);
- if (setup.quad.y0 == maxy - 1)
- setup.quad.mask &= (MASK_TOP_LEFT | MASK_TOP_RIGHT);
-}
-#endif
-
-#if 0
-/**
- * Emit a quad (pass to next stage) with clipping.
- */
-static INLINE void
-clip_emit_quad(struct setup_stage *setup)
-{
- quad_clip(setup);
- if (setup.quad.mask) {
- struct softpipe_context *sp = setup.softpipe;
- sp->quad.first->run(sp->quad.first, &setup.quad);
- }
-}
-#endif
-
/**
* Evaluate attribute coefficients (plane equations) to compute
* attribute values for the four fragments in a quad.
* Eg: four colors will be computed (in AoS format).
*/
static INLINE void
-eval_coeff(uint slot, float x, float y, vector float result[4])
+eval_coeff(uint slot, float x, float y, vector float w, vector float result[4])
{
switch (spu.vertex_info.attrib[slot].interp_mode) {
case INTERP_CONSTANT:
result[QUAD_TOP_LEFT] =
result[QUAD_TOP_RIGHT] =
result[QUAD_BOTTOM_LEFT] =
- result[QUAD_BOTTOM_RIGHT] = setup.coef[slot].a0.v;
+ result[QUAD_BOTTOM_RIGHT] = setup.coef[slot].a0;
break;
-
case INTERP_LINEAR:
- /* fall-through, for now */
- default:
{
- register vector float dadx = setup.coef[slot].dadx.v;
- register vector float dady = setup.coef[slot].dady.v;
- register vector float topLeft
- = spu_add(setup.coef[slot].a0.v,
- spu_add(spu_mul(spu_splats(x), dadx),
- spu_mul(spu_splats(y), dady)));
+ vector float dadx = setup.coef[slot].dadx;
+ vector float dady = setup.coef[slot].dady;
+ vector float topLeft =
+ spu_add(setup.coef[slot].a0,
+ spu_add(spu_mul(spu_splats(x), dadx),
+ spu_mul(spu_splats(y), dady)));
result[QUAD_TOP_LEFT] = topLeft;
result[QUAD_TOP_RIGHT] = spu_add(topLeft, dadx);
result[QUAD_BOTTOM_LEFT] = spu_add(topLeft, dady);
result[QUAD_BOTTOM_RIGHT] = spu_add(spu_add(topLeft, dadx), dady);
}
+ break;
+ case INTERP_PERSPECTIVE:
+ {
+ vector float dadx = setup.coef[slot].dadx;
+ vector float dady = setup.coef[slot].dady;
+ vector float topLeft =
+ spu_add(setup.coef[slot].a0,
+ spu_add(spu_mul(spu_splats(x), dadx),
+ spu_mul(spu_splats(y), dady)));
+
+ vector float wInv = spu_re(w); /* 1.0 / w */
+
+ result[QUAD_TOP_LEFT] = spu_mul(topLeft, wInv);
+ result[QUAD_TOP_RIGHT] = spu_mul(spu_add(topLeft, dadx), wInv);
+ result[QUAD_BOTTOM_LEFT] = spu_mul(spu_add(topLeft, dady), wInv);
+ result[QUAD_BOTTOM_RIGHT] = spu_mul(spu_add(spu_add(topLeft, dadx), dady), wInv);
+ }
+ break;
+ case INTERP_POS:
+ case INTERP_NONE:
+ break;
+ default:
+ ASSERT(0);
}
}
* XXX this will all be re-written someday.
*/
static INLINE void
-eval_coeff_soa(uint slot, float x, float y, vector float result[4])
+eval_coeff_soa(uint slot, float x, float y, vector float w, vector float result[4])
{
- eval_coeff(slot, x, y, result);
+ eval_coeff(slot, x, y, w, result);
_transpose_matrix4x4(result, result);
}
-
+/** Evalute coefficients to get Z for four pixels in a quad */
static INLINE vector float
eval_z(float x, float y)
{
const uint slot = 0;
- const float dzdx = setup.coef[slot].dadx.f[2];
- const float dzdy = setup.coef[slot].dady.f[2];
- const float topLeft = setup.coef[slot].a0.f[2] + x * dzdx + y * dzdy;
+ const float dzdx = spu_extract(setup.coef[slot].dadx, 2);
+ const float dzdy = spu_extract(setup.coef[slot].dady, 2);
+ const float topLeft = spu_extract(setup.coef[slot].a0, 2) + x * dzdx + y * dzdy;
const vector float topLeftv = spu_splats(topLeft);
const vector float derivs = (vector float) { 0.0, dzdx, dzdy, dzdx + dzdy };
return spu_add(topLeftv, derivs);
}
+/** Evalute coefficients to get W for four pixels in a quad */
+static INLINE vector float
+eval_w(float x, float y)
+{
+ const uint slot = 0;
+ const float dwdx = spu_extract(setup.coef[slot].dadx, 3);
+ const float dwdy = spu_extract(setup.coef[slot].dady, 3);
+ const float topLeft = spu_extract(setup.coef[slot].a0, 3) + x * dwdx + y * dwdy;
+ const vector float topLeftv = spu_splats(topLeft);
+ const vector float derivs = (vector float) { 0.0, dwdx, dwdy, dwdx + dwdy };
+ return spu_add(topLeftv, derivs);
+}
+
+
/**
* Emit a quad (pass to next stage). No clipping is done.
* Note: about 1/5 to 1/7 of the time, mask is zero and this function
*/
vector float inputs[4*4], outputs[2*4];
vector float fragZ = eval_z((float) x, (float) y);
+ vector float fragW = eval_w((float) x, (float) y);
+ vector unsigned int kill_mask;
/* setup inputs */
#if 0
- eval_coeff_soa(1, (float) x, (float) y, inputs);
+ eval_coeff_soa(1, (float) x, (float) y, fragW, inputs);
#else
uint i;
for (i = 0; i < spu.vertex_info.num_attribs; i++) {
- eval_coeff_soa(i+1, (float) x, (float) y, inputs + i * 4);
+ eval_coeff_soa(i+1, (float) x, (float) y, fragW, inputs + i * 4);
}
#endif
ASSERT(spu.fragment_program);
ASSERT(spu.fragment_ops);
/* Execute the current fragment program */
- spu.fragment_program(inputs, outputs, spu.constants);
+ kill_mask = spu.fragment_program(inputs, outputs, spu.constants);
+
+ mask = spu_andc(mask, kill_mask);
/* Execute per-fragment/quad operations, including:
* alpha test, z test, stencil test, blend and framebuffer writing.
+ * Note that there are two different fragment operations functions
+ * that can be called, one for front-facing fragments, and one
+ * for back-facing fragments. (Often the two are the same;
+ * but in some cases, like two-sided stenciling, they can be
+ * very different.) So choose the correct function depending
+ * on the calculated facing.
*/
- spu.fragment_ops(ix, iy, &spu.ctile, &spu.ztile,
+ spu.fragment_ops[setup.facing](ix, iy, &spu.ctile, &spu.ztile,
fragZ,
outputs[0*4+0],
outputs[0*4+1],
outputs[0*4+2],
outputs[0*4+3],
- mask,
- setup.facing);
+ mask);
}
}
}
* Given an X or Y coordinate, return the block/quad coordinate that it
* belongs to.
*/
-static INLINE int block( int x )
+static INLINE int
+block(int x)
{
return x & ~1;
}
* the triangle's bounds.
* The mask is a uint4 vector and each element will be 0 or 0xffffffff.
*/
-static INLINE mask_t calculate_mask( int x )
+static INLINE mask_t
+calculate_mask(int x)
{
/* This is a little tricky.
* Use & instead of && to avoid branches.
/**
* Render a horizontal span of quads
*/
-static void flush_spans( void )
+static void
+flush_spans(void)
{
int minleft, maxright;
int x;
return;
}
-
/* OK, we're very likely to need the tile data now.
* clear or finish waiting if needed.
*/
}
ASSERT(spu.cur_ctile_status != TILE_STATUS_DEFINED);
- if (spu.read_depth) {
+ if (spu.read_depth_stencil) {
if (spu.cur_ztile_status == TILE_STATUS_GETTING) {
/* wait for mfc_get() to complete */
//printf("SPU: %u: waiting for ztile\n", spu.init.id);
* calculate_mask() could be simplified a bit...
*/
for (x = block(minleft); x <= block(maxright); x += 2) {
-#if 1
emit_quad( x, setup.span.y, calculate_mask( x ));
-#endif
}
setup.span.y = 0;
setup.span.right[1] = 0;
}
+
#if DEBUG_VERTS
-static void print_vertex(const struct vertex_header *v)
+static void
+print_vertex(const struct vertex_header *v)
{
- int i;
- fprintf(stderr, "Vertex: (%p)\n", v);
- for (i = 0; i < setup.quad.nr_attrs; i++) {
- fprintf(stderr, " %d: %f %f %f %f\n", i,
- v->data[i][0], v->data[i][1], v->data[i][2], v->data[i][3]);
+ uint i;
+ fprintf(stderr, " Vertex: (%p)\n", v);
+ for (i = 0; i < spu.vertex_info.num_attribs; i++) {
+ fprintf(stderr, " %d: %f %f %f %f\n", i,
+ spu_extract(v->data[i], 0),
+ spu_extract(v->data[i], 1),
+ spu_extract(v->data[i], 2),
+ spu_extract(v->data[i], 3));
}
}
#endif
-static boolean setup_sort_vertices(const struct vertex_header *v0,
- const struct vertex_header *v1,
- const struct vertex_header *v2)
+/**
+ * Sort vertices from top to bottom.
+ * Compute area and determine front vs. back facing.
+ * Do coarse clip test against tile bounds
+ * \return FALSE if tri is totally outside tile, TRUE otherwise
+ */
+static boolean
+setup_sort_vertices(const struct vertex_header *v0,
+ const struct vertex_header *v1,
+ const struct vertex_header *v2)
{
+ float area, sign;
#if DEBUG_VERTS
- fprintf(stderr, "Triangle:\n");
- print_vertex(v0);
- print_vertex(v1);
- print_vertex(v2);
+ if (spu.init.id==0) {
+ fprintf(stderr, "SPU %u: Triangle:\n", spu.init.id);
+ print_vertex(v0);
+ print_vertex(v1);
+ print_vertex(v2);
+ }
#endif
- setup.vprovoke = v2;
-
/* determine bottom to top order of vertices */
{
float y0 = spu_extract(v0->data[0], 1);
setup.vmin = v0;
setup.vmid = v1;
setup.vmax = v2;
+ sign = -1.0f;
}
else if (y2 <= y0) {
/* y2<=y0<=y1 */
setup.vmin = v2;
setup.vmid = v0;
setup.vmax = v1;
+ sign = -1.0f;
}
else {
/* y0<=y2<=y1 */
setup.vmin = v0;
setup.vmid = v2;
setup.vmax = v1;
+ sign = 1.0f;
}
}
else {
setup.vmin = v1;
setup.vmid = v0;
setup.vmax = v2;
+ sign = 1.0f;
}
else if (y2 <= y1) {
/* y2<=y1<=y0 */
setup.vmin = v2;
setup.vmid = v1;
setup.vmax = v0;
+ sign = 1.0f;
}
else {
/* y1<=y2<=y0 */
setup.vmin = v1;
setup.vmid = v2;
setup.vmax = v0;
+ sign = -1.0f;
}
}
}
/*
* Compute triangle's area. Use 1/area to compute partial
* derivatives of attributes later.
- *
- * The area will be the same as prim->det, but the sign may be
- * different depending on how the vertices get sorted above.
- *
- * To determine whether the primitive is front or back facing we
- * use the prim->det value because its sign is correct.
*/
- {
- const float area = (setup.emaj.dx * setup.ebot.dy -
- setup.ebot.dx * setup.emaj.dy);
-
- setup.oneoverarea = 1.0f / area;
- /*
- _mesa_printf("%s one-over-area %f area %f det %f\n",
- __FUNCTION__, setup.oneoverarea, area, prim->det );
- */
- }
+ area = setup.emaj.dx * setup.ebot.dy - setup.ebot.dx * setup.emaj.dy;
-#if 0
- /* We need to know if this is a front or back-facing triangle for:
- * - the GLSL gl_FrontFacing fragment attribute (bool)
- * - two-sided stencil test
+ setup.oneOverArea = 1.0f / area;
+
+ /* The product of area * sign indicates front/back orientation (0/1).
+ * Just in case someone gets the bright idea of switching the front
+ * and back constants without noticing that we're assuming their
+ * values in this operation, also assert that the values are
+ * what we think they are.
*/
- setup.quad.facing = (prim->det > 0.0) ^ (setup.softpipe->rasterizer->front_winding == PIPE_WINDING_CW);
-#endif
+ ASSERT(CELL_FACING_FRONT == 0);
+ ASSERT(CELL_FACING_BACK == 1);
+ setup.facing = (area * sign > 0.0f)
+ ^ (spu.rasterizer.front_winding == PIPE_WINDING_CW);
+
+ setup.vprovoke = v2;
return TRUE;
}
* \param slot which attribute slot
*/
static INLINE void
-const_coeff(uint slot)
-{
- setup.coef[slot].dadx.v = (vector float) {0.0, 0.0, 0.0, 0.0};
- setup.coef[slot].dady.v = (vector float) {0.0, 0.0, 0.0, 0.0};
- setup.coef[slot].a0.v = setup.vprovoke->data[slot];
-}
-
-
-/**
- * Compute a0, dadx and dady for a linearly interpolated coefficient,
- * for a triangle.
- */
-static INLINE void
-tri_linear_coeff(uint slot, uint firstComp, uint lastComp)
+const_coeff4(uint slot)
{
- uint i;
- const float *vmin_d = (float *) &setup.vmin->data[slot];
- const float *vmid_d = (float *) &setup.vmid->data[slot];
- const float *vmax_d = (float *) &setup.vmax->data[slot];
- const float x = spu_extract(setup.vmin->data[0], 0) - 0.5f;
- const float y = spu_extract(setup.vmin->data[0], 1) - 0.5f;
-
- for (i = firstComp; i < lastComp; i++) {
- float botda = vmid_d[i] - vmin_d[i];
- float majda = vmax_d[i] - vmin_d[i];
- float a = setup.ebot.dy * majda - botda * setup.emaj.dy;
- float b = setup.emaj.dx * botda - majda * setup.ebot.dx;
-
- ASSERT(slot < PIPE_MAX_SHADER_INPUTS);
-
- setup.coef[slot].dadx.f[i] = a * setup.oneoverarea;
- setup.coef[slot].dady.f[i] = b * setup.oneoverarea;
-
- /* calculate a0 as the value which would be sampled for the
- * fragment at (0,0), taking into account that we want to sample at
- * pixel centers, in other words (0.5, 0.5).
- *
- * this is neat but unfortunately not a good way to do things for
- * triangles with very large values of dadx or dady as it will
- * result in the subtraction and re-addition from a0 of a very
- * large number, which means we'll end up loosing a lot of the
- * fractional bits and precision from a0. the way to fix this is
- * to define a0 as the sample at a pixel center somewhere near vmin
- * instead - i'll switch to this later.
- */
- setup.coef[slot].a0.f[i] = (vmin_d[i] -
- (setup.coef[slot].dadx.f[i] * x +
- setup.coef[slot].dady.f[i] * y));
- }
-
- /*
- _mesa_printf("attr[%d].%c: %f dx:%f dy:%f\n",
- slot, "xyzw"[i],
- setup.coef[slot].a0[i],
- setup.coef[slot].dadx.f[i],
- setup.coef[slot].dady.f[i]);
- */
+ setup.coef[slot].dadx = (vector float) {0.0, 0.0, 0.0, 0.0};
+ setup.coef[slot].dady = (vector float) {0.0, 0.0, 0.0, 0.0};
+ setup.coef[slot].a0 = setup.vprovoke->data[slot];
}
vector float b = spu_sub(spu_mul(spu_splats(setup.emaj.dx), botda),
spu_mul(majda, spu_splats(setup.ebot.dx)));
- setup.coef[slot].dadx.v = spu_mul(a, spu_splats(setup.oneoverarea));
- setup.coef[slot].dady.v = spu_mul(b, spu_splats(setup.oneoverarea));
+ setup.coef[slot].dadx = spu_mul(a, spu_splats(setup.oneOverArea));
+ setup.coef[slot].dady = spu_mul(b, spu_splats(setup.oneOverArea));
- vector float tempx = spu_mul(setup.coef[slot].dadx.v, xxxx);
- vector float tempy = spu_mul(setup.coef[slot].dady.v, yyyy);
+ vector float tempx = spu_mul(setup.coef[slot].dadx, xxxx);
+ vector float tempy = spu_mul(setup.coef[slot].dady, yyyy);
- setup.coef[slot].a0.v = spu_sub(vmin_d, spu_add(tempx, tempy));
+ setup.coef[slot].a0 = spu_sub(vmin_d, spu_add(tempx, tempy));
}
-
-#if 0
/**
* Compute a0, dadx and dady for a perspective-corrected interpolant,
* for a triangle.
* Later, when we compute the value at a particular fragment position we'll
* divide the interpolated value by the interpolated W at that fragment.
*/
-static void tri_persp_coeff( unsigned slot,
- unsigned i )
+static void
+tri_persp_coeff4(uint slot)
{
- /* premultiply by 1/w:
- */
- float mina = setup.vmin->data[slot][i] * setup.vmin->data[0][3];
- float mida = setup.vmid->data[slot][i] * setup.vmid->data[0][3];
- float maxa = setup.vmax->data[slot][i] * setup.vmax->data[0][3];
-
- float botda = mida - mina;
- float majda = maxa - mina;
- float a = setup.ebot.dy * majda - botda * setup.emaj.dy;
- float b = setup.emaj.dx * botda - majda * setup.ebot.dx;
-
- /*
- printf("tri persp %d,%d: %f %f %f\n", slot, i,
- setup.vmin->data[slot][i],
- setup.vmid->data[slot][i],
- setup.vmax->data[slot][i]
- );
- */
+ const vector float xxxx = spu_splats(spu_extract(setup.vmin->data[0], 0) - 0.5f);
+ const vector float yyyy = spu_splats(spu_extract(setup.vmin->data[0], 1) - 0.5f);
+
+ const vector float vmin_w = spu_splats(spu_extract(setup.vmin->data[0], 3));
+ const vector float vmid_w = spu_splats(spu_extract(setup.vmid->data[0], 3));
+ const vector float vmax_w = spu_splats(spu_extract(setup.vmax->data[0], 3));
- assert(slot < PIPE_MAX_SHADER_INPUTS);
- assert(i <= 3);
+ vector float vmin_d = setup.vmin->data[slot];
+ vector float vmid_d = setup.vmid->data[slot];
+ vector float vmax_d = setup.vmax->data[slot];
+
+ vmin_d = spu_mul(vmin_d, vmin_w);
+ vmid_d = spu_mul(vmid_d, vmid_w);
+ vmax_d = spu_mul(vmax_d, vmax_w);
+
+ vector float botda = vmid_d - vmin_d;
+ vector float majda = vmax_d - vmin_d;
- setup.coef[slot].dadx.f[i] = a * setup.oneoverarea;
- setup.coef[slot].dady.f[i] = b * setup.oneoverarea;
- setup.coef[slot].a0.f[i] = (mina -
- (setup.coef[slot].dadx.f[i] * (setup.vmin->data[0][0] - 0.5f) +
- setup.coef[slot].dady.f[i] * (setup.vmin->data[0][1] - 0.5f)));
+ vector float a = spu_sub(spu_mul(spu_splats(setup.ebot.dy), majda),
+ spu_mul(botda, spu_splats(setup.emaj.dy)));
+ vector float b = spu_sub(spu_mul(spu_splats(setup.emaj.dx), botda),
+ spu_mul(majda, spu_splats(setup.ebot.dx)));
+
+ setup.coef[slot].dadx = spu_mul(a, spu_splats(setup.oneOverArea));
+ setup.coef[slot].dady = spu_mul(b, spu_splats(setup.oneOverArea));
+
+ vector float tempx = spu_mul(setup.coef[slot].dadx, xxxx);
+ vector float tempy = spu_mul(setup.coef[slot].dady, yyyy);
+
+ setup.coef[slot].a0 = spu_sub(vmin_d, spu_add(tempx, tempy));
}
-#endif
+
/**
* Compute the setup.coef[] array dadx, dady, a0 values.
* Must be called after setup.vmin,vmid,vmax,vprovoke are initialized.
*/
-static void setup_tri_coefficients(void)
+static void
+setup_tri_coefficients(void)
{
-#if 1
uint i;
for (i = 0; i < spu.vertex_info.num_attribs; i++) {
switch (spu.vertex_info.attrib[i].interp_mode) {
case INTERP_NONE:
break;
- case INTERP_POS:
- /*tri_linear_coeff(i, 2, 3);*/
- /* XXX interp W if PERSPECTIVE... */
- tri_linear_coeff4(i);
- break;
case INTERP_CONSTANT:
- const_coeff(i);
+ const_coeff4(i);
break;
+ case INTERP_POS:
+ /* fall-through */
case INTERP_LINEAR:
tri_linear_coeff4(i);
break;
case INTERP_PERSPECTIVE:
- tri_linear_coeff4(i); /* temporary */
+ tri_persp_coeff4(i);
break;
default:
ASSERT(0);
}
}
-#else
- ASSERT(spu.vertex_info.interp_mode[0] == INTERP_POS);
- ASSERT(spu.vertex_info.interp_mode[1] == INTERP_LINEAR ||
- spu.vertex_info.interp_mode[1] == INTERP_CONSTANT);
- tri_linear_coeff(0, 2, 3); /* slot 0, z */
- tri_linear_coeff(1, 0, 4); /* slot 1, color */
-#endif
}
-static void setup_tri_edges(void)
+static void
+setup_tri_edges(void)
{
float vmin_x = spu_extract(setup.vmin->data[0], 0) + 0.5f;
float vmid_x = spu_extract(setup.vmid->data[0], 0) + 0.5f;
* Render the upper or lower half of a triangle.
* Scissoring/cliprect is applied here too.
*/
-static void subtriangle( struct edge *eleft,
- struct edge *eright,
- unsigned lines )
+static void
+subtriangle(struct edge *eleft, struct edge *eright, unsigned lines)
{
const int minx = setup.cliprect_minx;
const int maxx = setup.cliprect_maxx;
eright->sy += lines;
}
-static float
-determinant( const float *v0,
- const float *v1,
- const float *v2 )
-{
- /* edge vectors e = v0 - v2, f = v1 - v2 */
- const float ex = v0[0] - v2[0];
- const float ey = v0[1] - v2[1];
- const float fx = v1[0] - v2[0];
- const float fy = v1[1] - v2[1];
-
- /* det = cross(e,f).z */
- return ex * fy - ey * fx;
-}
-
/**
* Draw triangle into tile at (tx, ty) (tile coords)
* The tile data should have already been fetched.
*/
boolean
-tri_draw(const float *v0, const float *v1, const float *v2, uint tx, uint ty, uint front_winding)
+tri_draw(const float *v0, const float *v1, const float *v2,
+ uint tx, uint ty)
{
setup.tx = tx;
setup.ty = ty;
setup.cliprect_maxx = (tx + 1) * TILE_SIZE;
setup.cliprect_maxy = (ty + 1) * TILE_SIZE;
- /* Before we sort vertices, determine the facing of the triangle,
- * which will be needed for front/back-face stencil application
- */
- float det = determinant(v0, v1, v2);
- setup.facing = (det > 0.0) ^ (front_winding == PIPE_WINDING_CW);
-
if (!setup_sort_vertices((struct vertex_header *) v0,
(struct vertex_header *) v1,
(struct vertex_header *) v2)) {
setup.span.y_flags = 0;
setup.span.right[0] = 0;
setup.span.right[1] = 0;
- /* setup.span.z_mode = tri_z_mode( setup.ctx ); */
- /* init_constant_attribs( setup ); */
-
- if (setup.oneoverarea < 0.0) {
- /* emaj on left:
- */
+ if (setup.oneOverArea < 0.0) {
+ /* emaj on left */
subtriangle( &setup.emaj, &setup.ebot, setup.ebot.lines );
subtriangle( &setup.emaj, &setup.etop, setup.etop.lines );
}
else {
- /* emaj on right:
- */
+ /* emaj on right */
subtriangle( &setup.ebot, &setup.emaj, setup.ebot.lines );
subtriangle( &setup.etop, &setup.emaj, setup.etop.lines );
}
projects / mesa.git / blobdiff