static void setup_fragcoord_coef( struct lp_setup_context *setup, struct lp_line_info *info, unsigned slot, unsigned usage_mask) { /*X*/ if (usage_mask & TGSI_WRITEMASK_X) { info->a0[slot][0] = 0.0; info->dadx[slot][0] = 1.0; info->dady[slot][0] = 0.0; } /*Y*/ if (usage_mask & TGSI_WRITEMASK_Y) { info->a0[slot][1] = 0.0; info->dadx[slot][1] = 0.0; info->dady[slot][1] = 1.0; } /*Z*/ if (usage_mask & TGSI_WRITEMASK_Z) { linear_coef(setup, info, slot, 0, 2); } /*W*/ if (usage_mask & TGSI_WRITEMASK_W) { linear_coef(setup, info, slot, 0, 3); } }
/** * Special coefficient setup for gl_FragCoord. * X and Y are trivial * Z and W are copied from position_coef which should have already been computed. * We could do a bit less work if we'd examine gl_FragCoord's swizzle mask. */ static void setup_fragcoord_coef(struct lp_rast_shader_inputs *inputs, const struct lp_tri_info *info, unsigned slot, unsigned usage_mask) { /*X*/ if (usage_mask & TGSI_WRITEMASK_X) { inputs->a0[slot][0] = 0.0; inputs->dadx[slot][0] = 1.0; inputs->dady[slot][0] = 0.0; } /*Y*/ if (usage_mask & TGSI_WRITEMASK_Y) { inputs->a0[slot][1] = 0.0; inputs->dadx[slot][1] = 0.0; inputs->dady[slot][1] = 1.0; } /*Z*/ if (usage_mask & TGSI_WRITEMASK_Z) { linear_coef(inputs, info, slot, 0, 2); } /*W*/ if (usage_mask & TGSI_WRITEMASK_W) { linear_coef(inputs, 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_line_info *info) { const struct lp_setup_variant_key *key = &setup->setup.variant->key; unsigned fragcoord_usage_mask = TGSI_WRITEMASK_XYZ; unsigned slot; /* setup interpolation for all the remaining attributes: */ for (slot = 0; slot < key->num_inputs; slot++) { unsigned vert_attr = key->inputs[slot].src_index; unsigned usage_mask = key->inputs[slot].usage_mask; unsigned i; switch (key->inputs[slot].interp) { case LP_INTERP_CONSTANT: if (key->flatshade_first) { for (i = 0; i < NUM_CHANNELS; i++) if (usage_mask & (1 << i)) constant_coef(setup, info, slot+1, info->v1[vert_attr][i], i); } else { for (i = 0; i < NUM_CHANNELS; i++) if (usage_mask & (1 << i)) constant_coef(setup, info, 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, 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, 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, info, slot+1, info->frontfacing ? 1.0f : -1.0f, i); break; default: assert(0); } } /* The internal position input is in slot zero: */ setup_fragcoord_coef(setup, info, 0, fragcoord_usage_mask); }
/** * Compute the tri->coef[] array dadx, dady, a0 values. */ void lp_setup_tri_coef( struct lp_setup_context *setup, struct lp_rast_shader_inputs *inputs, const float (*v0)[4], const float (*v1)[4], const float (*v2)[4], boolean frontfacing) { unsigned fragcoord_usage_mask = TGSI_WRITEMASK_XYZ; unsigned slot; unsigned i; struct lp_tri_info info; float dx01 = v0[0][0] - v1[0][0]; float dy01 = v0[0][1] - v1[0][1]; float dx20 = v2[0][0] - v0[0][0]; float dy20 = v2[0][1] - v0[0][1]; float oneoverarea = 1.0f / (dx01 * dy20 - dx20 * dy01); info.v0 = v0; info.v1 = v1; info.v2 = v2; info.frontfacing = frontfacing; info.x0_center = v0[0][0] - setup->pixel_offset; info.y0_center = v0[0][1] - setup->pixel_offset; info.dx01_ooa = dx01 * oneoverarea; info.dx20_ooa = dx20 * oneoverarea; info.dy01_ooa = dy01 * oneoverarea; info.dy20_ooa = dy20 * oneoverarea; /* 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; 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(inputs, slot+1, info.v0[vert_attr][i], i); } else { for (i = 0; i < NUM_CHANNELS; i++) if (usage_mask & (1 << i)) constant_coef(inputs, 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(inputs, &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(inputs, &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: setup_facing_coef(inputs, slot+1, info.frontfacing, usage_mask); break; default: assert(0); } } /* The internal position input is in slot zero: */ setup_fragcoord_coef(inputs, &info, 0, fragcoord_usage_mask); }