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Added comments, assertions.

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This commit is contained in:
Brian 2007-07-10 10:53:57 -06:00
parent 8c1fa904ed
commit 57a5385652
1 changed files with 13 additions and 0 deletions
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13
src/mesa/pipe/softpipe/sp_prim_setup.c
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@ -306,11 +306,18 @@ static GLboolean setup_sort_vertices( struct setup_stage *setup,
/**
* Compute a0 for a constant-valued coefficient (GL_FLAT shading).
* The value value comes from vertex->data[slot][i].
* The result will be put into setup->coef[slot].a0[i].
* \param slot which attribute slot
* \param i which component of the slot (0..3)
*/
static void const_coeff( struct setup_stage *setup,
GLuint slot,
GLuint i )
{
assert(slot < FRAG_ATTRIB_MAX);
assert(i <= 3);
setup->coef[slot].dadx[i] = 0;
setup->coef[slot].dady[i] = 0;
@ -333,6 +340,9 @@ static void tri_linear_coeff( struct setup_stage *setup,
GLfloat a = setup->ebot.dy * majda - botda * setup->emaj.dy;
GLfloat b = setup->emaj.dx * botda - majda * setup->ebot.dx;
assert(slot < FRAG_ATTRIB_MAX);
assert(i <= 3);
setup->coef[slot].dadx[i] = a * setup->oneoverarea;
setup->coef[slot].dady[i] = b * setup->oneoverarea;
@ -379,6 +389,9 @@ static void tri_persp_coeff( struct setup_stage *setup,
GLfloat a = setup->ebot.dy * majda - botda * setup->emaj.dy;
GLfloat b = setup->emaj.dx * botda - majda * setup->ebot.dx;
assert(slot < FRAG_ATTRIB_MAX);
assert(i <= 3);
setup->coef[slot].dadx[i] = a * setup->oneoverarea;
setup->coef[slot].dady[i] = b * setup->oneoverarea;
setup->coef[slot].a0[i] = (mina -