* Binning code for lines
*/
+#include "util/u_math.h"
+#include "util/u_memory.h"
+#include "lp_perf.h"
#include "lp_setup_context.h"
+#include "lp_rast.h"
+#include "lp_state_fs.h"
-static void line_nop( struct lp_setup_context *setup,
- const float (*v0)[4],
- const float (*v1)[4] )
+#define NUM_CHANNELS 4
+
+struct lp_line_info {
+
+ float dx;
+ float dy;
+ float oneoverarea;
+
+ const float (*v1)[4];
+ const float (*v2)[4];
+};
+
+
+/**
+ * Compute a0 for a constant-valued coefficient (GL_FLAT shading).
+ */
+static void constant_coef( struct lp_setup_context *setup,
+ struct lp_rast_triangle *tri,
+ unsigned slot,
+ const float value,
+ unsigned i )
+{
+ tri->inputs.a0[slot][i] = value;
+ tri->inputs.dadx[slot][i] = 0.0f;
+ tri->inputs.dady[slot][i] = 0.0f;
+}
+
+
+/**
+ * Compute a0, dadx and dady for a linearly interpolated coefficient,
+ * for a triangle.
+ */
+static void linear_coef( struct lp_setup_context *setup,
+ struct lp_rast_triangle *tri,
+ struct lp_line_info *info,
+ unsigned slot,
+ unsigned vert_attr,
+ unsigned i)
+{
+ float a1 = info->v1[vert_attr][i];
+ float a2 = info->v2[vert_attr][i];
+
+ float da21 = a1 - a2;
+ float dadx = da21 * info->dx * info->oneoverarea;
+ float dady = da21 * info->dy * info->oneoverarea;
+
+ tri->inputs.dadx[slot][i] = dadx;
+ tri->inputs.dady[slot][i] = dady;
+
+ tri->inputs.a0[slot][i] = (a1 -
+ (dadx * (info->v1[0][0] - setup->pixel_offset) +
+ dady * (info->v1[0][1] - setup->pixel_offset)));
+}
+
+
+/**
+ * Compute a0, dadx and dady for a perspective-corrected interpolant,
+ * for a triangle.
+ * We basically multiply the vertex value by 1/w before computing
+ * the plane coefficients (a0, dadx, dady).
+ * 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 perspective_coef( struct lp_setup_context *setup,
+ struct lp_rast_triangle *tri,
+ struct lp_line_info *info,
+ unsigned slot,
+ unsigned vert_attr,
+ unsigned i)
+{
+ /* premultiply by 1/w (v[0][3] is always 1/w):
+ */
+ float a1 = info->v1[vert_attr][i] * info->v1[0][3];
+ float a2 = info->v2[vert_attr][i] * info->v2[0][3];
+
+ float da21 = a1 - a2;
+ float dadx = da21 * info->dx * info->oneoverarea;
+ float dady = da21 * info->dy * info->oneoverarea;
+
+ tri->inputs.dadx[slot][i] = dadx;
+ tri->inputs.dady[slot][i] = dady;
+
+ tri->inputs.a0[slot][i] = (a1 -
+ (dadx * (info->v1[0][0] - setup->pixel_offset) +
+ dady * (info->v1[0][1] - setup->pixel_offset)));
+}
+
+static void
+setup_fragcoord_coef( struct lp_setup_context *setup,
+ struct lp_rast_triangle *tri,
+ struct lp_line_info *info,
+ unsigned slot,
+ unsigned usage_mask)
+{
+ /*X*/
+ if (usage_mask & TGSI_WRITEMASK_X) {
+ tri->inputs.a0[slot][0] = 0.0;
+ tri->inputs.dadx[slot][0] = 1.0;
+ tri->inputs.dady[slot][0] = 0.0;
+ }
+
+ /*Y*/
+ if (usage_mask & TGSI_WRITEMASK_Y) {
+ tri->inputs.a0[slot][1] = 0.0;
+ tri->inputs.dadx[slot][1] = 0.0;
+ tri->inputs.dady[slot][1] = 1.0;
+ }
+
+ /*Z*/
+ if (usage_mask & TGSI_WRITEMASK_Z) {
+ linear_coef(setup, tri, info, slot, 0, 2);
+ }
+
+ /*W*/
+ if (usage_mask & TGSI_WRITEMASK_W) {
+ linear_coef(setup, tri, info, slot, 0, 3);
+ }
+}
+
+/**
+ * Compute the tri->coef[] array dadx, dady, a0 values.
+ */
+static void setup_line_coefficients( struct lp_setup_context *setup,
+ struct lp_rast_triangle *tri,
+ struct lp_line_info *info)
{
+ unsigned fragcoord_usage_mask = TGSI_WRITEMASK_XYZ;
+ unsigned slot;
+
+ /* setup interpolation for all the remaining attributes:
+ */
+ for (slot = 0; slot < setup->fs.nr_inputs; slot++) {
+ unsigned vert_attr = setup->fs.input[slot].src_index;
+ unsigned usage_mask = setup->fs.input[slot].usage_mask;
+ unsigned i;
+
+ switch (setup->fs.input[slot].interp) {
+ case LP_INTERP_CONSTANT:
+ if (setup->flatshade_first) {
+ for (i = 0; i < NUM_CHANNELS; i++)
+ if (usage_mask & (1 << i))
+ constant_coef(setup, tri, slot+1, info->v1[vert_attr][i], i);
+ }
+ else {
+ for (i = 0; i < NUM_CHANNELS; i++)
+ if (usage_mask & (1 << i))
+ constant_coef(setup, tri, slot+1, info->v2[vert_attr][i], i);
+ }
+ break;
+
+ case LP_INTERP_LINEAR:
+ for (i = 0; i < NUM_CHANNELS; i++)
+ if (usage_mask & (1 << i))
+ linear_coef(setup, tri, info, slot+1, vert_attr, i);
+ break;
+
+ case LP_INTERP_PERSPECTIVE:
+ for (i = 0; i < NUM_CHANNELS; i++)
+ if (usage_mask & (1 << i))
+ perspective_coef(setup, tri, info, slot+1, vert_attr, i);
+ fragcoord_usage_mask |= TGSI_WRITEMASK_W;
+ break;
+
+ case LP_INTERP_POSITION:
+ /*
+ * The generated pixel interpolators will pick up the coeffs from
+ * slot 0, so all need to ensure that the usage mask is covers all
+ * usages.
+ */
+ fragcoord_usage_mask |= usage_mask;
+ break;
+
+ case LP_INTERP_FACING:
+ for (i = 0; i < NUM_CHANNELS; i++)
+ if (usage_mask & (1 << i))
+ constant_coef(setup, tri, slot+1, 1.0, i);
+ break;
+
+ default:
+ assert(0);
+ }
+ }
+
+ /* The internal position input is in slot zero:
+ */
+ setup_fragcoord_coef(setup, tri, info, 0,
+ fragcoord_usage_mask);
}
-void
-lp_setup_choose_line( struct lp_setup_context *setup )
+
+static INLINE int subpixel_snap( float a )
{
- setup->line = line_nop;
+ return util_iround(FIXED_ONE * a);
+}
+
+
+/**
+ * Print line vertex attribs (for debug).
+ */
+static void
+print_line(struct lp_setup_context *setup,
+ const float (*v1)[4],
+ const float (*v2)[4])
+{
+ uint i;
+
+ debug_printf("llvmpipe line\n");
+ for (i = 0; i < 1 + setup->fs.nr_inputs; i++) {
+ debug_printf(" v1[%d]: %f %f %f %f\n", i,
+ v1[i][0], v1[i][1], v1[i][2], v1[i][3]);
+ }
+ for (i = 0; i < 1 + setup->fs.nr_inputs; i++) {
+ debug_printf(" v2[%d]: %f %f %f %f\n", i,
+ v2[i][0], v2[i][1], v2[i][2], v2[i][3]);
+ }
+}
+
+
+static INLINE boolean sign(float x){
+ return x >= 0;
+}
+
+
+/* Used on positive floats only:
+ */
+static INLINE float fracf(float f)
+{
+ return f - floorf(f);
+}
+
+
+
+static boolean
+try_setup_line( struct lp_setup_context *setup,
+ const float (*v1)[4],
+ const float (*v2)[4])
+{
+ struct lp_scene *scene = setup->scene;
+ struct lp_rast_triangle *line;
+ struct lp_line_info info;
+ float width = MAX2(1.0, setup->line_width);
+ struct u_rect bbox;
+ unsigned tri_bytes;
+ int x[4];
+ int y[4];
+ int i;
+ int nr_planes = 4;
+
+ /* linewidth should be interpreted as integer */
+ int fixed_width = util_iround(width) * FIXED_ONE;
+
+ float x_offset=0;
+ float y_offset=0;
+ float x_offset_end=0;
+ float y_offset_end=0;
+
+ float x1diff;
+ float y1diff;
+ float x2diff;
+ float y2diff;
+ float dx, dy;
+ float area;
+
+ boolean draw_start;
+ boolean draw_end;
+ boolean will_draw_start;
+ boolean will_draw_end;
+
+ if (0)
+ print_line(setup, v1, v2);
+
+ if (setup->scissor_test) {
+ nr_planes = 8;
+ }
+ else {
+ nr_planes = 4;
+ }
+
+
+ dx = v1[0][0] - v2[0][0];
+ dy = v1[0][1] - v2[0][1];
+ area = (dx * dx + dy * dy);
+ if (area == 0) {
+ LP_COUNT(nr_culled_tris);
+ return TRUE;
+ }
+
+ info.oneoverarea = 1.0f / area;
+ info.dx = dx;
+ info.dy = dy;
+ info.v1 = v1;
+ info.v2 = v2;
+
+
+ /* X-MAJOR LINE */
+ if (fabsf(dx) >= fabsf(dy)) {
+ float dydx = dy / dx;
+
+ x1diff = v1[0][0] - (float) floor(v1[0][0]) - 0.5;
+ y1diff = v1[0][1] - (float) floor(v1[0][1]) - 0.5;
+ x2diff = v2[0][0] - (float) floor(v2[0][0]) - 0.5;
+ y2diff = v2[0][1] - (float) floor(v2[0][1]) - 0.5;
+
+ if (y2diff==-0.5 && dy<0){
+ y2diff = 0.5;
+ }
+
+ /*
+ * Diamond exit rule test for starting point
+ */
+ if (fabsf(x1diff) + fabsf(y1diff) < 0.5) {
+ draw_start = TRUE;
+ }
+ else if (sign(x1diff) == sign(-dx)) {
+ draw_start = FALSE;
+ }
+ else if (sign(-y1diff) != sign(dy)) {
+ draw_start = TRUE;
+ }
+ else {
+ /* do intersection test */
+ float yintersect = fracf(v1[0][1]) + x1diff * dydx;
+ draw_start = (yintersect < 1.0 && yintersect > 0.0);
+ }
+
+
+ /*
+ * Diamond exit rule test for ending point
+ */
+ if (fabsf(x2diff) + fabsf(y2diff) < 0.5) {
+ draw_end = FALSE;
+ }
+ else if (sign(x2diff) != sign(-dx)) {
+ draw_end = FALSE;
+ }
+ else if (sign(-y2diff) == sign(dy)) {
+ draw_end = TRUE;
+ }
+ else {
+ /* do intersection test */
+ float yintersect = fracf(v2[0][1]) + x2diff * dydx;
+ draw_end = (yintersect < 1.0 && yintersect > 0.0);
+ }
+
+ /* Are we already drawing start/end?
+ */
+ will_draw_start = sign(-x1diff) != sign(dx);
+ will_draw_end = (sign(x2diff) == sign(-dx)) || x2diff==0;
+
+ if (dx < 0) {
+ /* if v2 is to the right of v1, swap pointers */
+ const float (*temp)[4] = v1;
+ v1 = v2;
+ v2 = temp;
+ dx = -dx;
+ dy = -dy;
+ /* Otherwise shift planes appropriately */
+ if (will_draw_start != draw_start) {
+ x_offset_end = - x1diff - 0.5;
+ y_offset_end = x_offset_end * dydx;
+
+ }
+ if (will_draw_end != draw_end) {
+ x_offset = - x2diff - 0.5;
+ y_offset = x_offset * dydx;
+ }
+
+ }
+ else{
+ /* Otherwise shift planes appropriately */
+ if (will_draw_start != draw_start) {
+ x_offset = - x1diff + 0.5;
+ y_offset = x_offset * dydx;
+ }
+ if (will_draw_end != draw_end) {
+ x_offset_end = - x2diff + 0.5;
+ y_offset_end = x_offset_end * dydx;
+ }
+ }
+
+ /* x/y positions in fixed point */
+ x[0] = subpixel_snap(v1[0][0] + x_offset - setup->pixel_offset);
+ x[1] = subpixel_snap(v2[0][0] + x_offset_end - setup->pixel_offset);
+ x[2] = subpixel_snap(v2[0][0] + x_offset_end - setup->pixel_offset);
+ x[3] = subpixel_snap(v1[0][0] + x_offset - setup->pixel_offset);
+
+ y[0] = subpixel_snap(v1[0][1] + y_offset - setup->pixel_offset) - fixed_width/2;
+ y[1] = subpixel_snap(v2[0][1] + y_offset_end - setup->pixel_offset) - fixed_width/2;
+ y[2] = subpixel_snap(v2[0][1] + y_offset_end - setup->pixel_offset) + fixed_width/2;
+ y[3] = subpixel_snap(v1[0][1] + y_offset - setup->pixel_offset) + fixed_width/2;
+
+ }
+ else {
+ const float dxdy = dx / dy;
+
+ /* Y-MAJOR LINE */
+ x1diff = v1[0][0] - (float) floor(v1[0][0]) - 0.5;
+ y1diff = v1[0][1] - (float) floor(v1[0][1]) - 0.5;
+ x2diff = v2[0][0] - (float) floor(v2[0][0]) - 0.5;
+ y2diff = v2[0][1] - (float) floor(v2[0][1]) - 0.5;
+
+ if (x2diff==-0.5 && dx<0) {
+ x2diff = 0.5;
+ }
+
+ /*
+ * Diamond exit rule test for starting point
+ */
+ if (fabsf(x1diff) + fabsf(y1diff) < 0.5) {
+ draw_start = TRUE;
+ }
+ else if (sign(-y1diff) == sign(dy)) {
+ draw_start = FALSE;
+ }
+ else if (sign(x1diff) != sign(-dx)) {
+ draw_start = TRUE;
+ }
+ else {
+ /* do intersection test */
+ float xintersect = fracf(v1[0][0]) + y1diff * dxdy;
+ draw_start = (xintersect < 1.0 && xintersect > 0.0);
+ }
+
+ /*
+ * Diamond exit rule test for ending point
+ */
+ if (fabsf(x2diff) + fabsf(y2diff) < 0.5) {
+ draw_end = FALSE;
+ }
+ else if (sign(-y2diff) != sign(dy) ) {
+ draw_end = FALSE;
+ }
+ else if (sign(x2diff) == sign(-dx) ) {
+ draw_end = TRUE;
+ }
+ else {
+ /* do intersection test */
+ float xintersect = fracf(v2[0][0]) + y2diff * dxdy;
+ draw_end = (xintersect < 1.0 && xintersect >= 0.0);
+ }
+
+ /* Are we already drawing start/end?
+ */
+ will_draw_start = sign(y1diff) == sign(dy);
+ will_draw_end = (sign(-y2diff) == sign(dy)) || y2diff==0;
+
+ if (dy > 0) {
+ /* if v2 is on top of v1, swap pointers */
+ const float (*temp)[4] = v1;
+ v1 = v2;
+ v2 = temp;
+ dx = -dx;
+ dy = -dy;
+
+ /* Otherwise shift planes appropriately */
+ if (will_draw_start != draw_start) {
+ y_offset_end = - y1diff + 0.5;
+ x_offset_end = y_offset_end * dxdy;
+ }
+ if (will_draw_end != draw_end) {
+ y_offset = - y2diff + 0.5;
+ x_offset = y_offset * dxdy;
+ }
+ }
+ else {
+ /* Otherwise shift planes appropriately */
+ if (will_draw_start != draw_start) {
+ y_offset = - y1diff - 0.5;
+ x_offset = y_offset * dxdy;
+
+ }
+ if (will_draw_end != draw_end) {
+ y_offset_end = - y2diff - 0.5;
+ x_offset_end = y_offset_end * dxdy;
+ }
+ }
+
+ /* x/y positions in fixed point */
+ x[0] = subpixel_snap(v1[0][0] + x_offset - setup->pixel_offset) - fixed_width/2;
+ x[1] = subpixel_snap(v2[0][0] + x_offset_end - setup->pixel_offset) - fixed_width/2;
+ x[2] = subpixel_snap(v2[0][0] + x_offset_end - setup->pixel_offset) + fixed_width/2;
+ x[3] = subpixel_snap(v1[0][0] + x_offset - setup->pixel_offset) + fixed_width/2;
+
+ y[0] = subpixel_snap(v1[0][1] + y_offset - setup->pixel_offset);
+ y[1] = subpixel_snap(v2[0][1] + y_offset_end - setup->pixel_offset);
+ y[2] = subpixel_snap(v2[0][1] + y_offset_end - setup->pixel_offset);
+ y[3] = subpixel_snap(v1[0][1] + y_offset - setup->pixel_offset);
+ }
+
+
+
+ LP_COUNT(nr_tris);
+
+
+ /* Bounding rectangle (in pixels) */
+ {
+ /* Yes this is necessary to accurately calculate bounding boxes
+ * with the two fill-conventions we support. GL (normally) ends
+ * up needing a bottom-left fill convention, which requires
+ * slightly different rounding.
+ */
+ int adj = (setup->pixel_offset != 0) ? 1 : 0;
+
+ bbox.x0 = (MIN4(x[0], x[1], x[2], x[3]) + (FIXED_ONE-1)) >> FIXED_ORDER;
+ bbox.x1 = (MAX4(x[0], x[1], x[2], x[3]) + (FIXED_ONE-1)) >> FIXED_ORDER;
+ bbox.y0 = (MIN4(y[0], y[1], y[2], y[3]) + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
+ bbox.y1 = (MAX4(y[0], y[1], y[2], y[3]) + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
+
+ /* Inclusive coordinates:
+ */
+ bbox.x1--;
+ bbox.y1--;
+ }
+
+ if (bbox.x1 < bbox.x0 ||
+ bbox.y1 < bbox.y0) {
+ if (0) debug_printf("empty bounding box\n");
+ LP_COUNT(nr_culled_tris);
+ return TRUE;
+ }
+
+ if (!u_rect_test_intersection(&setup->draw_region, &bbox)) {
+ if (0) debug_printf("offscreen\n");
+ LP_COUNT(nr_culled_tris);
+ return TRUE;
+ }
+
+ u_rect_find_intersection(&setup->draw_region, &bbox);
+
+ line = lp_setup_alloc_triangle(scene,
+ setup->fs.nr_inputs,
+ nr_planes,
+ &tri_bytes);
+ if (!line)
+ return FALSE;
+
+#ifdef DEBUG
+ line->v[0][0] = v1[0][0];
+ line->v[1][0] = v2[0][0];
+ line->v[0][1] = v1[0][1];
+ line->v[1][1] = v2[0][1];
+#endif
+
+ /* calculate the deltas */
+ line->plane[0].dcdy = x[0] - x[1];
+ line->plane[1].dcdy = x[1] - x[2];
+ line->plane[2].dcdy = x[2] - x[3];
+ line->plane[3].dcdy = x[3] - x[0];
+
+ line->plane[0].dcdx = y[0] - y[1];
+ line->plane[1].dcdx = y[1] - y[2];
+ line->plane[2].dcdx = y[2] - y[3];
+ line->plane[3].dcdx = y[3] - y[0];
+
+
+ /* Setup parameter interpolants:
+ */
+ setup_line_coefficients( setup, line, &info);
+
+ line->inputs.facing = 1.0F;
+ line->inputs.disable = FALSE;
+ line->inputs.opaque = FALSE;
+
+ for (i = 0; i < 4; i++) {
+ struct lp_rast_plane *plane = &line->plane[i];
+
+ /* half-edge constants, will be interated over the whole render
+ * target.
+ */
+ plane->c = plane->dcdx * x[i] - plane->dcdy * y[i];
+
+
+ /* correct for top-left vs. bottom-left fill convention.
+ *
+ * note that we're overloading gl_rasterization_rules to mean
+ * both (0.5,0.5) pixel centers *and* bottom-left filling
+ * convention.
+ *
+ * GL actually has a top-left filling convention, but GL's
+ * notion of "top" differs from gallium's...
+ *
+ * Also, sometimes (in FBO cases) GL will render upside down
+ * to its usual method, in which case it will probably want
+ * to use the opposite, top-left convention.
+ */
+ if (plane->dcdx < 0) {
+ /* both fill conventions want this - adjust for left edges */
+ plane->c++;
+ }
+ else if (plane->dcdx == 0) {
+ if (setup->pixel_offset == 0) {
+ /* correct for top-left fill convention:
+ */
+ if (plane->dcdy > 0) plane->c++;
+ }
+ else {
+ /* correct for bottom-left fill convention:
+ */
+ if (plane->dcdy < 0) plane->c++;
+ }
+ }
+
+ plane->dcdx *= FIXED_ONE;
+ plane->dcdy *= FIXED_ONE;
+
+ /* find trivial reject offsets for each edge for a single-pixel
+ * sized block. These will be scaled up at each recursive level to
+ * match the active blocksize. Scaling in this way works best if
+ * the blocks are square.
+ */
+ plane->eo = 0;
+ if (plane->dcdx < 0) plane->eo -= plane->dcdx;
+ if (plane->dcdy > 0) plane->eo += plane->dcdy;
+
+ /* Calculate trivial accept offsets from the above.
+ */
+ plane->ei = plane->dcdy - plane->dcdx - plane->eo;
+ }
+
+
+ /*
+ * When rasterizing scissored tris, use the intersection of the
+ * triangle bounding box and the scissor rect to generate the
+ * scissor planes.
+ *
+ * This permits us to cut off the triangle "tails" that are present
+ * in the intermediate recursive levels caused when two of the
+ * triangles edges don't diverge quickly enough to trivially reject
+ * exterior blocks from the triangle.
+ *
+ * It's not really clear if it's worth worrying about these tails,
+ * but since we generate the planes for each scissored tri, it's
+ * free to trim them in this case.
+ *
+ * Note that otherwise, the scissor planes only vary in 'C' value,
+ * and even then only on state-changes. Could alternatively store
+ * these planes elsewhere.
+ */
+ if (nr_planes == 8) {
+ line->plane[4].dcdx = -1;
+ line->plane[4].dcdy = 0;
+ line->plane[4].c = 1-bbox.x0;
+ line->plane[4].ei = 0;
+ line->plane[4].eo = 1;
+
+ line->plane[5].dcdx = 1;
+ line->plane[5].dcdy = 0;
+ line->plane[5].c = bbox.x1+1;
+ line->plane[5].ei = -1;
+ line->plane[5].eo = 0;
+
+ line->plane[6].dcdx = 0;
+ line->plane[6].dcdy = 1;
+ line->plane[6].c = 1-bbox.y0;
+ line->plane[6].ei = 0;
+ line->plane[6].eo = 1;
+
+ line->plane[7].dcdx = 0;
+ line->plane[7].dcdy = -1;
+ line->plane[7].c = bbox.y1+1;
+ line->plane[7].ei = -1;
+ line->plane[7].eo = 0;
+ }
+
+ return lp_setup_bin_triangle(setup, line, &bbox, nr_planes);
+}
+
+
+static void lp_setup_line( struct lp_setup_context *setup,
+ const float (*v0)[4],
+ const float (*v1)[4] )
+{
+ if (!try_setup_line( setup, v0, v1 ))
+ {
+ if (!lp_setup_flush_and_restart(setup))
+ return;
+
+ if (!try_setup_line( setup, v0, v1 ))
+ return;
+ }
+}
+
+
+void lp_setup_choose_line( struct lp_setup_context *setup )
+{
+ setup->line = lp_setup_line;
}
projects / mesa.git / blobdiff