summaryrefslogtreecommitdiff
path: root/src/mesa/softpipe
diff options
context:
space:
mode:
authorBrian <brian.paul@tungstengraphics.com>2007-05-28 16:13:17 -0600
committerBrian <brian.paul@tungstengraphics.com>2007-05-28 16:13:17 -0600
commit6fc596193370aba52ddb742c61a4687c7831897c (patch)
tree952005876323a5cf31da792f04acaf8bbee25c27 /src/mesa/softpipe
parentd46fa8bbefdd46953e86514e43ef51cd234ecc74 (diff)
implement point rendering
Diffstat (limited to 'src/mesa/softpipe')
-rw-r--r--src/mesa/softpipe/generic/g_prim_setup.c113
1 files changed, 101 insertions, 12 deletions
diff --git a/src/mesa/softpipe/generic/g_prim_setup.c b/src/mesa/softpipe/generic/g_prim_setup.c
index ce93c0a6f9..614fc16c7c 100644
--- a/src/mesa/softpipe/generic/g_prim_setup.c
+++ b/src/mesa/softpipe/generic/g_prim_setup.c
@@ -74,7 +74,6 @@ struct setup_stage {
GLuint y_flags;
GLuint mask; /**< mask of MASK_BOTTOM/TOP_LEFT/RIGHT bits */
} span;
-
};
@@ -190,16 +189,6 @@ static void flush_spans( struct setup_stage *setup )
setup->span.right[1] = 0;
}
-
-/**
- * Do setup for point rasterization, then render the point.
- */
-static void
-setup_point( struct prim_stage *stage,
- struct prim_header *header )
-{
-}
-
/**
* Do setup for line rasterization, then render the line.
@@ -386,7 +375,10 @@ static void persp_coeff( struct setup_stage *setup,
-
+/**
+ * Compute the setup->coef[] array dadx, dady, a0 values.
+ * Must be called after setup->vmin,vmid,vmax,vprovoke are initialized.
+ */
static void setup_coefficients( struct setup_stage *setup )
{
const enum interp_mode *interp = setup->stage.generic->interp;
@@ -566,6 +558,103 @@ static void setup_tri( struct prim_stage *stage,
flush_spans( setup );
}
+
+/**
+ * Do setup for point rasterization, then render the point.
+ * Round or square points...
+ * XXX could optimize a lot for 1-pixel points.
+ */
+static void
+setup_point( struct prim_stage *stage,
+ struct prim_header *prim )
+{
+ struct setup_stage *setup = setup_stage( stage );
+ GLfloat halfSize = 7.3; /*XXX this is a vertex attrib */
+ GLfloat halfSizeSquared = halfSize * halfSize;
+ const struct vertex_header *v0 = prim->v[0];
+ const GLfloat x = v0->data[FRAG_ATTRIB_WPOS][0];
+ const GLfloat y = v0->data[FRAG_ATTRIB_WPOS][1];
+ const GLint ixmin = block((GLint) (x - halfSize));
+ const GLint ixmax = block((GLint) (x + halfSize));
+ const GLint iymin = block((GLint) (y - halfSize));
+ const GLint iymax = block((GLint) (y + halfSize));
+ GLboolean round = GL_TRUE;
+ GLint ix, iy;
+ GLuint slot, j;
+
+ /* For points, all interpolants are constant-valued.
+ * However, for point sprites, we'll need to setup texcoords appropriately.
+ * XXX: which coefficients are the texcoords???
+ * We may do point sprites as textured quads...
+ */
+ setup->vprovoke = prim->v[0];
+ const_coeff(setup, 0, 2);
+ const_coeff(setup, 0, 3);
+ for (slot = 1; slot < setup->quad.nr_attrs; slot++) {
+ for (j = 0; j < NUM_CHANNELS; j++)
+ const_coeff(setup, slot, j);
+ }
+
+ /* XXX need to clip against scissor bounds too */
+
+ for (iy = iymin; iy <= iymax; iy += 2) {
+ for (ix = ixmin; ix <= ixmax; ix += 2) {
+
+ if (round) {
+ /* rounded points */
+ /* XXX for GL_SMOOTH, need to compute per-fragment coverage too */
+ GLfloat dx, dy;
+
+ setup->quad.mask = 0x0;
+
+ dx = (ix + 0.5) - x;
+ dy = (iy + 0.5) - y;
+ if (dx * dx + dy * dy <= halfSizeSquared)
+ setup->quad.mask |= MASK_BOTTOM_LEFT;
+
+ dx = (ix + 1.5) - x;
+ dy = (iy + 0.5) - y;
+ if (dx * dx + dy * dy <= halfSizeSquared)
+ setup->quad.mask |= MASK_BOTTOM_RIGHT;
+
+ dx = (ix + 0.5) - x;
+ dy = (iy + 1.5) - y;
+ if (dx * dx + dy * dy <= halfSizeSquared)
+ setup->quad.mask |= MASK_TOP_LEFT;
+
+ dx = (ix + 1.5) - x;
+ dy = (iy + 1.5) - y;
+ if (dx * dx + dy * dy <= halfSizeSquared)
+ setup->quad.mask |= MASK_TOP_RIGHT;
+ }
+ else {
+ /* square points */
+ setup->quad.mask = 0xf;
+
+ if (ix + 0.5 < x - halfSize)
+ setup->quad.mask &= (MASK_BOTTOM_RIGHT | MASK_TOP_RIGHT);
+
+ if (ix + 1.5 > x + halfSize)
+ setup->quad.mask &= (MASK_BOTTOM_LEFT | MASK_TOP_LEFT);
+
+ if (iy + 0.5 < y - halfSize)
+ setup->quad.mask &= (MASK_TOP_LEFT | MASK_TOP_RIGHT);
+
+ if (iy + 1.5 > y + halfSize)
+ setup->quad.mask &= (MASK_BOTTOM_LEFT | MASK_BOTTOM_RIGHT);
+ }
+
+ if (setup->quad.mask) {
+ setup->quad.x0 = ix;
+ setup->quad.y0 = iy;
+ quad_shade( setup->stage.generic, &setup->quad );
+ }
+ }
+ }
+}
+
+
+
static void setup_end( struct prim_stage *stage )
{
}